/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:03:43,067 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:03:43,070 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:03:43,100 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:03:43,118 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:03:43,119 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:03:43,121 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:03:43,122 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:03:43,124 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:03:43,125 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:03:43,126 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:03:43,131 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:03:43,134 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:03:43,135 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:03:43,136 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:03:43,138 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:03:43,143 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 12:03:43,150 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:03:43,150 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:03:43,151 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:03:43,151 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 12:03:43,164 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:03:43,165 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:03:43,167 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:03:43,167 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:03:43,167 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:03:43,167 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:03:43,167 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:03:43,168 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:03:43,168 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:03:43,168 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:03:43,168 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:03:43,169 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:03:43,169 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:03:43,169 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:03:43,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:03:43,169 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:03:43,169 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:03:43,169 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:03:43,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:03:43,169 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:03:43,170 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:03:43,170 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:03:43,170 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:03:43,170 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:03:43,473 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:03:43,489 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:03:43,491 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:03:43,492 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:03:43,492 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:03:43,493 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2021-05-06 12:03:43,543 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69fbda2ab/86fca521bdef4ce589422e6679a396ae/FLAGf412e249e [2021-05-06 12:03:43,859 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:03:43,859 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2021-05-06 12:03:43,864 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69fbda2ab/86fca521bdef4ce589422e6679a396ae/FLAGf412e249e [2021-05-06 12:03:44,267 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69fbda2ab/86fca521bdef4ce589422e6679a396ae [2021-05-06 12:03:44,269 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:03:44,272 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:03:44,276 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:03:44,276 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:03:44,278 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:03:44,278 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,279 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@120dbc5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44, skipping insertion in model container [2021-05-06 12:03:44,279 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,284 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:03:44,294 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:03:44,392 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c[465,478] [2021-05-06 12:03:44,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:03:44,412 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:03:44,422 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c[465,478] [2021-05-06 12:03:44,433 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:03:44,444 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:03:44,444 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44 WrapperNode [2021-05-06 12:03:44,444 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:03:44,446 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:03:44,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:03:44,447 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:03:44,491 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,491 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,496 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,496 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,507 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,510 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,511 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... [2021-05-06 12:03:44,512 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:03:44,524 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:03:44,524 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:03:44,524 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:03:44,525 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:03:44,578 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:03:44,578 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:03:44,578 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:03:44,578 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 12:03:44,578 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:03:44,578 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:03:44,578 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:03:44,579 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:03:44,579 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:03:44,579 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:03:44,579 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 12:03:44,579 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 12:03:44,580 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:03:44,580 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:03:44,580 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:03:44,580 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:03:44,580 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:03:44,581 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:03:44,581 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:03:44,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:03:44,823 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:03:44,823 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 12:03:44,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:03:44 BoogieIcfgContainer [2021-05-06 12:03:44,824 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:03:44,825 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:03:44,825 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:03:44,827 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:03:44,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:03:44" (1/3) ... [2021-05-06 12:03:44,827 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ce19d2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:03:44, skipping insertion in model container [2021-05-06 12:03:44,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:44" (2/3) ... [2021-05-06 12:03:44,827 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ce19d2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:03:44, skipping insertion in model container [2021-05-06 12:03:44,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:03:44" (3/3) ... [2021-05-06 12:03:44,828 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2021-05-06 12:03:44,832 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:03:44,834 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:03:44,843 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:03:44,855 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:03:44,855 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:03:44,855 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:03:44,855 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:03:44,855 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:03:44,855 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:03:44,855 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:03:44,855 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:03:44,863 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 12:03:44,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 12:03:44,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:44,869 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:44,870 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:44,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:44,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1039138334, now seen corresponding path program 1 times [2021-05-06 12:03:44,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:44,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203219052] [2021-05-06 12:03:44,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:44,923 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:03:44,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:45,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:45,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:45,129 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:45,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203219052] [2021-05-06 12:03:45,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [203219052] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:45,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:45,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 12:03:45,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176723215] [2021-05-06 12:03:45,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 12:03:45,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:45,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 12:03:45,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:03:45,148 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:45,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:45,243 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2021-05-06 12:03:45,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 12:03:45,245 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-06 12:03:45,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:45,250 INFO L225 Difference]: With dead ends: 50 [2021-05-06 12:03:45,251 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 12:03:45,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:03:45,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 12:03:45,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 12:03:45,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:45,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-05-06 12:03:45,297 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 21 [2021-05-06 12:03:45,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:45,297 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-05-06 12:03:45,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:45,298 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-05-06 12:03:45,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 12:03:45,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:45,299 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:45,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:03:45,299 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:45,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:45,301 INFO L82 PathProgramCache]: Analyzing trace with hash 677978447, now seen corresponding path program 1 times [2021-05-06 12:03:45,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:45,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913924724] [2021-05-06 12:03:45,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:45,311 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:03:45,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:45,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:45,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:45,424 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:45,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913924724] [2021-05-06 12:03:45,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1913924724] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:45,424 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:45,424 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 12:03:45,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98214938] [2021-05-06 12:03:45,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 12:03:45,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:45,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 12:03:45,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 12:03:45,426 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:45,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:45,524 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-05-06 12:03:45,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 12:03:45,525 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-06 12:03:45,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:45,525 INFO L225 Difference]: With dead ends: 46 [2021-05-06 12:03:45,525 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 12:03:45,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 54.4ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:03:45,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 12:03:45,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-06 12:03:45,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:45,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-06 12:03:45,537 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 21 [2021-05-06 12:03:45,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:45,538 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-06 12:03:45,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:45,538 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-06 12:03:45,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 12:03:45,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:45,538 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:45,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 12:03:45,539 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:45,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:45,539 INFO L82 PathProgramCache]: Analyzing trace with hash -673447056, now seen corresponding path program 1 times [2021-05-06 12:03:45,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:45,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1471309757] [2021-05-06 12:03:45,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:45,581 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:45,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:45,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:45,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:45,642 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:45,653 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:45,669 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:45,671 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:45,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:45,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:45,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,724 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:45,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:45,752 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:45,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1471309757] [2021-05-06 12:03:45,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1471309757] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:45,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:45,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 12:03:45,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206738530] [2021-05-06 12:03:45,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 12:03:45,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:45,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 12:03:45,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:03:45,754 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:45,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:45,862 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2021-05-06 12:03:45,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 12:03:45,863 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-05-06 12:03:45,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:45,864 INFO L225 Difference]: With dead ends: 59 [2021-05-06 12:03:45,864 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 12:03:45,865 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 53.9ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-06 12:03:45,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 12:03:45,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2021-05-06 12:03:45,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 28 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:45,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2021-05-06 12:03:45,872 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 24 [2021-05-06 12:03:45,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:45,872 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2021-05-06 12:03:45,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:45,873 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2021-05-06 12:03:45,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 12:03:45,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:45,873 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:45,873 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 12:03:45,873 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:45,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:45,874 INFO L82 PathProgramCache]: Analyzing trace with hash 708533296, now seen corresponding path program 1 times [2021-05-06 12:03:45,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:45,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208180995] [2021-05-06 12:03:45,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:45,880 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:45,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:45,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:45,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:45,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:45,922 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:45,933 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:45,935 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:45,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:45,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:45,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:45,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:45,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:46,013 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:46,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208180995] [2021-05-06 12:03:46,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1208180995] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:46,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:46,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 12:03:46,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085906706] [2021-05-06 12:03:46,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 12:03:46,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:46,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 12:03:46,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:03:46,015 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:46,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:46,114 INFO L93 Difference]: Finished difference Result 64 states and 85 transitions. [2021-05-06 12:03:46,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 12:03:46,114 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-05-06 12:03:46,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:46,115 INFO L225 Difference]: With dead ends: 64 [2021-05-06 12:03:46,115 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 12:03:46,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 55.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 12:03:46,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 12:03:46,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2021-05-06 12:03:46,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:46,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-06 12:03:46,120 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 24 [2021-05-06 12:03:46,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:46,120 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-06 12:03:46,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:46,121 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-06 12:03:46,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:46,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:46,121 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:46,121 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 12:03:46,121 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:46,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:46,122 INFO L82 PathProgramCache]: Analyzing trace with hash -2061972965, now seen corresponding path program 1 times [2021-05-06 12:03:46,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:46,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4684324] [2021-05-06 12:03:46,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:46,130 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:46,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:46,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:46,169 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:46,183 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:46,185 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:46,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:46,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:46,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:46,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:46,290 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:46,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4684324] [2021-05-06 12:03:46,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [4684324] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:46,291 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:46,291 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:03:46,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503881738] [2021-05-06 12:03:46,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:03:46,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:46,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:03:46,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:03:46,292 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:46,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:46,474 INFO L93 Difference]: Finished difference Result 77 states and 98 transitions. [2021-05-06 12:03:46,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 12:03:46,474 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:46,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:46,475 INFO L225 Difference]: With dead ends: 77 [2021-05-06 12:03:46,476 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 12:03:46,476 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 155.2ms TimeCoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:03:46,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 12:03:46,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2021-05-06 12:03:46,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 12:03:46,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2021-05-06 12:03:46,500 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 25 [2021-05-06 12:03:46,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:46,500 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2021-05-06 12:03:46,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:46,501 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2021-05-06 12:03:46,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:46,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:46,502 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:46,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 12:03:46,502 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:46,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:46,502 INFO L82 PathProgramCache]: Analyzing trace with hash -2060125923, now seen corresponding path program 1 times [2021-05-06 12:03:46,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:46,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385912463] [2021-05-06 12:03:46,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:46,510 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:46,525 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:46,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:46,550 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:46,564 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:46,566 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:46,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:46,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:46,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:46,724 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:46,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385912463] [2021-05-06 12:03:46,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1385912463] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:46,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:46,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:03:46,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067178827] [2021-05-06 12:03:46,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:03:46,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:46,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:03:46,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-05-06 12:03:46,726 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:47,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:47,102 INFO L93 Difference]: Finished difference Result 118 states and 154 transitions. [2021-05-06 12:03:47,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 12:03:47,103 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:47,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:47,104 INFO L225 Difference]: With dead ends: 118 [2021-05-06 12:03:47,104 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 12:03:47,104 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 271.9ms TimeCoverageRelationStatistics Valid=68, Invalid=172, Unknown=0, NotChecked=0, Total=240 [2021-05-06 12:03:47,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 12:03:47,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 60. [2021-05-06 12:03:47,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 52 states have internal predecessors, (67), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 12:03:47,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2021-05-06 12:03:47,134 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 25 [2021-05-06 12:03:47,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:47,134 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2021-05-06 12:03:47,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:47,134 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2021-05-06 12:03:47,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:47,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:47,135 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:47,135 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 12:03:47,135 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:47,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:47,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1425494747, now seen corresponding path program 1 times [2021-05-06 12:03:47,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:47,136 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586932467] [2021-05-06 12:03:47,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:47,144 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:47,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:47,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:47,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:47,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:47,185 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:47,198 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:47,202 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:47,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:47,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:47,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:47,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:47,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:47,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:47,421 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:47,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586932467] [2021-05-06 12:03:47,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1586932467] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:47,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:47,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:03:47,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778227477] [2021-05-06 12:03:47,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:03:47,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:47,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:03:47,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:03:47,423 INFO L87 Difference]: Start difference. First operand 60 states and 76 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:47,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:47,734 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2021-05-06 12:03:47,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:03:47,735 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:47,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:47,735 INFO L225 Difference]: With dead ends: 88 [2021-05-06 12:03:47,735 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 12:03:47,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 302.0ms TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:03:47,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 12:03:47,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 75. [2021-05-06 12:03:47,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 64 states have (on average 1.28125) internal successors, (82), 65 states have internal predecessors, (82), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 12:03:47,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 93 transitions. [2021-05-06 12:03:47,745 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 93 transitions. Word has length 25 [2021-05-06 12:03:47,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:47,745 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 93 transitions. [2021-05-06 12:03:47,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:47,746 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 93 transitions. [2021-05-06 12:03:47,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:47,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:47,746 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:47,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 12:03:47,747 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:47,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:47,747 INFO L82 PathProgramCache]: Analyzing trace with hash 2067453981, now seen corresponding path program 1 times [2021-05-06 12:03:47,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:47,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977725533] [2021-05-06 12:03:47,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:47,752 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:47,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:47,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:47,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:47,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:47,798 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:47,808 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:47,810 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:47,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:47,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:47,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:47,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:47,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:47,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:47,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:47,947 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:47,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977725533] [2021-05-06 12:03:47,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1977725533] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:47,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:47,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:03:47,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809702483] [2021-05-06 12:03:47,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:03:47,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:47,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:03:47,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:03:47,948 INFO L87 Difference]: Start difference. First operand 75 states and 93 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:48,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:48,142 INFO L93 Difference]: Finished difference Result 127 states and 163 transitions. [2021-05-06 12:03:48,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 12:03:48,142 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:48,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:48,144 INFO L225 Difference]: With dead ends: 127 [2021-05-06 12:03:48,144 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 12:03:48,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 125.0ms TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-05-06 12:03:48,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 12:03:48,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2021-05-06 12:03:48,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 84 states have (on average 1.2976190476190477) internal successors, (109), 85 states have internal predecessors, (109), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 12:03:48,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 122 transitions. [2021-05-06 12:03:48,156 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 122 transitions. Word has length 25 [2021-05-06 12:03:48,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:48,156 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 122 transitions. [2021-05-06 12:03:48,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:48,156 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 122 transitions. [2021-05-06 12:03:48,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:48,157 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:48,157 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:48,157 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 12:03:48,157 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:48,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:48,157 INFO L82 PathProgramCache]: Analyzing trace with hash 2069301023, now seen corresponding path program 1 times [2021-05-06 12:03:48,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:48,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445060479] [2021-05-06 12:03:48,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:48,162 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:48,163 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:48,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:48,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:48,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:48,201 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:48,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:48,213 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:48,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:48,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:48,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:48,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:48,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:48,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:48,415 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:48,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445060479] [2021-05-06 12:03:48,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [445060479] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:48,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:48,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:03:48,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838541552] [2021-05-06 12:03:48,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:03:48,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:48,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:03:48,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:03:48,416 INFO L87 Difference]: Start difference. First operand 96 states and 122 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:48,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:48,951 INFO L93 Difference]: Finished difference Result 121 states and 153 transitions. [2021-05-06 12:03:48,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:03:48,952 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:48,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:48,953 INFO L225 Difference]: With dead ends: 121 [2021-05-06 12:03:48,953 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 12:03:48,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 389.4ms TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:03:48,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 12:03:48,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 110. [2021-05-06 12:03:48,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 95 states have (on average 1.2947368421052632) internal successors, (123), 98 states have internal predecessors, (123), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:48,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 140 transitions. [2021-05-06 12:03:48,989 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 140 transitions. Word has length 25 [2021-05-06 12:03:48,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:48,989 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 140 transitions. [2021-05-06 12:03:48,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:48,989 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 140 transitions. [2021-05-06 12:03:48,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 12:03:48,993 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:48,993 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:48,993 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 12:03:48,994 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:48,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:48,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1643345404, now seen corresponding path program 1 times [2021-05-06 12:03:48,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:48,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532291320] [2021-05-06 12:03:48,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:49,016 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:49,019 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:49,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:49,079 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:49,091 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,093 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:49,115 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:49,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,128 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:49,131 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:49,169 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:49,183 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,207 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:49,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:49,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:49,262 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:49,273 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,274 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:49,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:49,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:49,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:49,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:49,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:49,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:49,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:49,457 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:49,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532291320] [2021-05-06 12:03:49,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [532291320] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:49,478 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:49,478 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 12:03:49,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713348435] [2021-05-06 12:03:49,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 12:03:49,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:49,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 12:03:49,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-05-06 12:03:49,479 INFO L87 Difference]: Start difference. First operand 110 states and 140 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:49,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:49,686 INFO L93 Difference]: Finished difference Result 227 states and 298 transitions. [2021-05-06 12:03:49,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 12:03:49,686 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-05-06 12:03:49,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:49,687 INFO L225 Difference]: With dead ends: 227 [2021-05-06 12:03:49,687 INFO L226 Difference]: Without dead ends: 147 [2021-05-06 12:03:49,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 175.1ms TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-05-06 12:03:49,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-06 12:03:49,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 128. [2021-05-06 12:03:49,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 113 states have (on average 1.2831858407079646) internal successors, (145), 116 states have internal predecessors, (145), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:49,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 162 transitions. [2021-05-06 12:03:49,700 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 162 transitions. Word has length 28 [2021-05-06 12:03:49,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:49,701 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 162 transitions. [2021-05-06 12:03:49,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:49,701 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 162 transitions. [2021-05-06 12:03:49,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 12:03:49,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:49,701 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:49,702 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 12:03:49,702 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:49,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:49,702 INFO L82 PathProgramCache]: Analyzing trace with hash -646101633, now seen corresponding path program 2 times [2021-05-06 12:03:49,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:49,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704200082] [2021-05-06 12:03:49,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:49,712 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:49,727 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:49,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:49,753 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:49,765 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,769 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:49,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:49,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:49,805 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:49,815 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,816 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:49,821 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:49,822 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:49,835 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:49,855 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:49,867 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,872 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:49,873 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:49,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:49,910 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:49,920 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,921 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:49,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:49,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:49,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:49,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:49,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:49,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:49,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:50,167 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:50,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704200082] [2021-05-06 12:03:50,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1704200082] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:50,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:50,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 12:03:50,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371803920] [2021-05-06 12:03:50,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 12:03:50,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:50,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 12:03:50,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-06 12:03:50,169 INFO L87 Difference]: Start difference. First operand 128 states and 162 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:50,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:50,414 INFO L93 Difference]: Finished difference Result 240 states and 308 transitions. [2021-05-06 12:03:50,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 12:03:50,415 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2021-05-06 12:03:50,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:50,416 INFO L225 Difference]: With dead ends: 240 [2021-05-06 12:03:50,416 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 12:03:50,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 213.7ms TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:03:50,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 12:03:50,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 137. [2021-05-06 12:03:50,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 122 states have (on average 1.2622950819672132) internal successors, (154), 125 states have internal predecessors, (154), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:50,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 171 transitions. [2021-05-06 12:03:50,429 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 171 transitions. Word has length 31 [2021-05-06 12:03:50,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:50,429 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 171 transitions. [2021-05-06 12:03:50,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:50,429 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 171 transitions. [2021-05-06 12:03:50,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 12:03:50,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:50,430 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:50,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 12:03:50,430 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:50,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:50,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1657218883, now seen corresponding path program 3 times [2021-05-06 12:03:50,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:50,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481379184] [2021-05-06 12:03:50,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:50,436 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:50,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:50,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:50,476 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:50,488 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:50,489 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:50,493 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:50,494 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:50,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:50,529 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:50,541 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:50,545 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:50,556 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:50,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:50,601 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:50,611 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:50,612 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:50,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:50,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:50,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:50,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:50,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:50,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:50,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:50,835 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:50,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481379184] [2021-05-06 12:03:50,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [481379184] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:50,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:50,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:03:50,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505283711] [2021-05-06 12:03:50,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:03:50,836 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:50,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:03:50,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2021-05-06 12:03:50,837 INFO L87 Difference]: Start difference. First operand 137 states and 171 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:51,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:51,024 INFO L93 Difference]: Finished difference Result 273 states and 347 transitions. [2021-05-06 12:03:51,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 12:03:51,025 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2021-05-06 12:03:51,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:51,026 INFO L225 Difference]: With dead ends: 273 [2021-05-06 12:03:51,026 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 12:03:51,026 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 196.4ms TimeCoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:03:51,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 12:03:51,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 149. [2021-05-06 12:03:51,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 134 states have (on average 1.2686567164179106) internal successors, (170), 137 states have internal predecessors, (170), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:51,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 187 transitions. [2021-05-06 12:03:51,038 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 187 transitions. Word has length 31 [2021-05-06 12:03:51,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:51,039 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 187 transitions. [2021-05-06 12:03:51,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:51,039 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 187 transitions. [2021-05-06 12:03:51,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 12:03:51,039 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:51,039 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:51,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 12:03:51,040 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:51,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:51,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1482120420, now seen corresponding path program 4 times [2021-05-06 12:03:51,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:51,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117131646] [2021-05-06 12:03:51,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:51,050 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:51,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,061 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:51,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:51,083 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:51,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:51,099 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:51,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:51,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:51,169 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:51,181 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:51,182 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:51,188 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:51,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:51,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:51,234 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:51,248 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:51,252 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:51,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:51,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:51,290 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:51,302 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:51,303 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:51,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:51,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:51,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:51,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:51,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:51,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:51,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:51,559 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:51,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117131646] [2021-05-06 12:03:51,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1117131646] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:51,561 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:51,561 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:03:51,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097889538] [2021-05-06 12:03:51,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:03:51,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:51,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:03:51,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:03:51,562 INFO L87 Difference]: Start difference. First operand 149 states and 187 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:51,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:51,822 INFO L93 Difference]: Finished difference Result 281 states and 356 transitions. [2021-05-06 12:03:51,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 12:03:51,822 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2021-05-06 12:03:51,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:51,823 INFO L225 Difference]: With dead ends: 281 [2021-05-06 12:03:51,823 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 12:03:51,824 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 227.8ms TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:03:51,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 12:03:51,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 158. [2021-05-06 12:03:51,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 143 states have (on average 1.2517482517482517) internal successors, (179), 146 states have internal predecessors, (179), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:51,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 196 transitions. [2021-05-06 12:03:51,836 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 196 transitions. Word has length 34 [2021-05-06 12:03:51,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:51,836 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 196 transitions. [2021-05-06 12:03:51,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:51,837 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 196 transitions. [2021-05-06 12:03:51,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 12:03:51,837 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:51,837 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:51,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 12:03:51,837 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:51,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:51,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1224498974, now seen corresponding path program 5 times [2021-05-06 12:03:51,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:51,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875561041] [2021-05-06 12:03:51,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:51,846 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:51,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:51,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:51,877 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:51,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:51,891 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:51,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,903 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:51,916 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:51,923 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:51,932 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:51,933 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:51,937 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:51,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,950 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:51,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:51,968 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:51,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:51,984 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:51,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:51,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:52,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:52,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:52,019 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:52,028 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:52,029 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:52,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:52,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:52,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:52,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:52,253 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:52,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875561041] [2021-05-06 12:03:52,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [875561041] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:52,253 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:52,253 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 12:03:52,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102918891] [2021-05-06 12:03:52,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 12:03:52,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:52,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 12:03:52,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2021-05-06 12:03:52,254 INFO L87 Difference]: Start difference. First operand 158 states and 196 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:52,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:52,528 INFO L93 Difference]: Finished difference Result 303 states and 378 transitions. [2021-05-06 12:03:52,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 12:03:52,529 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2021-05-06 12:03:52,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:52,530 INFO L225 Difference]: With dead ends: 303 [2021-05-06 12:03:52,530 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 12:03:52,531 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 209.6ms TimeCoverageRelationStatistics Valid=81, Invalid=261, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:03:52,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 12:03:52,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 158. [2021-05-06 12:03:52,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 143 states have (on average 1.2517482517482517) internal successors, (179), 146 states have internal predecessors, (179), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:52,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 196 transitions. [2021-05-06 12:03:52,543 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 196 transitions. Word has length 34 [2021-05-06 12:03:52,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:52,543 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 196 transitions. [2021-05-06 12:03:52,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:52,543 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 196 transitions. [2021-05-06 12:03:52,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 12:03:52,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:52,543 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:52,543 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 12:03:52,543 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:52,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:52,544 INFO L82 PathProgramCache]: Analyzing trace with hash 213381724, now seen corresponding path program 6 times [2021-05-06 12:03:52,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:52,544 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741824667] [2021-05-06 12:03:52,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:52,552 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:52,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:52,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:52,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:52,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:52,583 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:52,592 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:52,593 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:52,601 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:52,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:52,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:52,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:52,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:52,632 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:52,642 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:52,647 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:52,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:52,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:52,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:52,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:52,678 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:52,687 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:52,688 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:52,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:52,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:52,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:52,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:52,897 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:52,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741824667] [2021-05-06 12:03:52,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1741824667] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:52,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:52,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 12:03:52,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132144104] [2021-05-06 12:03:52,898 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:03:52,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:52,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:03:52,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:03:52,899 INFO L87 Difference]: Start difference. First operand 158 states and 196 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:53,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:53,131 INFO L93 Difference]: Finished difference Result 317 states and 402 transitions. [2021-05-06 12:03:53,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:03:53,132 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2021-05-06 12:03:53,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:53,133 INFO L225 Difference]: With dead ends: 317 [2021-05-06 12:03:53,133 INFO L226 Difference]: Without dead ends: 195 [2021-05-06 12:03:53,133 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 203.5ms TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:03:53,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-05-06 12:03:53,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 170. [2021-05-06 12:03:53,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 155 states have (on average 1.2580645161290323) internal successors, (195), 158 states have internal predecessors, (195), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:53,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 212 transitions. [2021-05-06 12:03:53,146 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 212 transitions. Word has length 34 [2021-05-06 12:03:53,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:53,146 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 212 transitions. [2021-05-06 12:03:53,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:53,146 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 212 transitions. [2021-05-06 12:03:53,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:03:53,147 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:53,147 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:53,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 12:03:53,147 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:53,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:53,147 INFO L82 PathProgramCache]: Analyzing trace with hash -802454433, now seen corresponding path program 7 times [2021-05-06 12:03:53,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:53,147 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816648925] [2021-05-06 12:03:53,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:53,156 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:53,168 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:53,179 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:53,187 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:53,198 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:53,201 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:53,210 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:53,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:53,231 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:53,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:53,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:53,244 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:53,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:53,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:53,273 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:53,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:53,288 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:53,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:53,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:53,317 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:53,327 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:53,328 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:53,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:53,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:53,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:53,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:53,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:53,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:53,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:53,633 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:53,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816648925] [2021-05-06 12:03:53,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1816648925] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:53,634 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:53,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 12:03:53,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467155665] [2021-05-06 12:03:53,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 12:03:53,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:53,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 12:03:53,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:03:53,635 INFO L87 Difference]: Start difference. First operand 170 states and 212 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:53,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:53,844 INFO L93 Difference]: Finished difference Result 324 states and 402 transitions. [2021-05-06 12:03:53,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 12:03:53,845 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:03:53,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:53,846 INFO L225 Difference]: With dead ends: 324 [2021-05-06 12:03:53,846 INFO L226 Difference]: Without dead ends: 204 [2021-05-06 12:03:53,846 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 287.0ms TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:03:53,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-06 12:03:53,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 179. [2021-05-06 12:03:53,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 164 states have (on average 1.2439024390243902) internal successors, (204), 167 states have internal predecessors, (204), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:53,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 221 transitions. [2021-05-06 12:03:53,860 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 221 transitions. Word has length 37 [2021-05-06 12:03:53,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:53,860 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 221 transitions. [2021-05-06 12:03:53,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:53,860 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 221 transitions. [2021-05-06 12:03:53,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:03:53,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:53,861 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:53,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 12:03:53,861 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:53,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:53,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1620102883, now seen corresponding path program 8 times [2021-05-06 12:03:53,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:53,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975142784] [2021-05-06 12:03:53,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:53,868 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:53,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:53,879 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:53,896 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:53,908 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:53,910 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:53,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,920 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,929 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:53,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:53,939 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:53,949 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:53,950 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:53,953 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:53,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:53,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:53,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:53,981 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:53,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:53,996 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:54,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,006 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:54,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:54,025 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:54,035 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:54,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:54,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:54,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:54,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:54,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:54,330 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:54,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975142784] [2021-05-06 12:03:54,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [975142784] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:54,331 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:54,331 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 12:03:54,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517531494] [2021-05-06 12:03:54,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:03:54,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:54,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:03:54,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:03:54,332 INFO L87 Difference]: Start difference. First operand 179 states and 221 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:54,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:54,652 INFO L93 Difference]: Finished difference Result 347 states and 429 transitions. [2021-05-06 12:03:54,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:03:54,653 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:03:54,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:54,654 INFO L225 Difference]: With dead ends: 347 [2021-05-06 12:03:54,654 INFO L226 Difference]: Without dead ends: 218 [2021-05-06 12:03:54,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 299.9ms TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:03:54,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-06 12:03:54,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 179. [2021-05-06 12:03:54,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 164 states have (on average 1.2439024390243902) internal successors, (204), 167 states have internal predecessors, (204), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:54,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 221 transitions. [2021-05-06 12:03:54,669 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 221 transitions. Word has length 37 [2021-05-06 12:03:54,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:54,669 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 221 transitions. [2021-05-06 12:03:54,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:54,669 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 221 transitions. [2021-05-06 12:03:54,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:03:54,670 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:54,670 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:54,670 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 12:03:54,670 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:54,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:54,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1086516511, now seen corresponding path program 9 times [2021-05-06 12:03:54,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:54,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060717900] [2021-05-06 12:03:54,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:54,677 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:54,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,678 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,686 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:54,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:54,704 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:54,716 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:54,719 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:54,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,731 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:54,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:54,748 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:54,758 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:54,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:54,761 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:54,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:54,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:54,791 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:54,802 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:54,805 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:54,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:54,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:54,819 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:54,834 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:54,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:54,844 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:54,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:54,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:54,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:54,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:55,135 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:55,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060717900] [2021-05-06 12:03:55,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2060717900] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:55,135 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:55,135 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 12:03:55,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019766709] [2021-05-06 12:03:55,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 12:03:55,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:55,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 12:03:55,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:03:55,136 INFO L87 Difference]: Start difference. First operand 179 states and 221 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 15 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:55,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:55,406 INFO L93 Difference]: Finished difference Result 342 states and 424 transitions. [2021-05-06 12:03:55,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:03:55,407 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 15 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:03:55,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:55,407 INFO L225 Difference]: With dead ends: 342 [2021-05-06 12:03:55,408 INFO L226 Difference]: Without dead ends: 213 [2021-05-06 12:03:55,408 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 284.2ms TimeCoverageRelationStatistics Valid=94, Invalid=326, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:03:55,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-06 12:03:55,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 179. [2021-05-06 12:03:55,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 164 states have (on average 1.2439024390243902) internal successors, (204), 167 states have internal predecessors, (204), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:55,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 221 transitions. [2021-05-06 12:03:55,422 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 221 transitions. Word has length 37 [2021-05-06 12:03:55,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:55,423 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 221 transitions. [2021-05-06 12:03:55,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 15 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:55,423 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 221 transitions. [2021-05-06 12:03:55,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:03:55,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:55,423 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:55,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 12:03:55,423 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:55,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:55,424 INFO L82 PathProgramCache]: Analyzing trace with hash 75399261, now seen corresponding path program 10 times [2021-05-06 12:03:55,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:55,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340400119] [2021-05-06 12:03:55,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:55,429 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:55,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:55,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:55,457 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:55,467 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:55,468 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:55,471 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:55,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,492 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:55,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:55,501 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:55,513 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:55,516 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:55,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:55,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:55,547 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:55,557 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:55,558 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:55,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:55,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:55,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:55,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:55,857 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:55,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340400119] [2021-05-06 12:03:55,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1340400119] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:55,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:55,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:03:55,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482575801] [2021-05-06 12:03:55,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:03:55,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:55,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:03:55,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:03:55,858 INFO L87 Difference]: Start difference. First operand 179 states and 221 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:56,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:56,126 INFO L93 Difference]: Finished difference Result 356 states and 448 transitions. [2021-05-06 12:03:56,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:03:56,126 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:03:56,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:56,127 INFO L225 Difference]: With dead ends: 356 [2021-05-06 12:03:56,127 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 12:03:56,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 290.9ms TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:03:56,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 12:03:56,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 191. [2021-05-06 12:03:56,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 176 states have (on average 1.25) internal successors, (220), 179 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:56,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 237 transitions. [2021-05-06 12:03:56,145 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 237 transitions. Word has length 37 [2021-05-06 12:03:56,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:56,145 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 237 transitions. [2021-05-06 12:03:56,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:56,145 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 237 transitions. [2021-05-06 12:03:56,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 12:03:56,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:56,146 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:56,146 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 12:03:56,146 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:56,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:56,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1742651763, now seen corresponding path program 1 times [2021-05-06 12:03:56,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:56,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1873873823] [2021-05-06 12:03:56,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:56,169 WARN L240 tifierPushTermWalker]: treesize reduction 85, result has 48.5 percent of original size [2021-05-06 12:03:56,216 WARN L245 tifierPushTermWalker]: treesize reduction 85, result has 48.5 percent of original size 80 [2021-05-06 12:03:56,247 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,259 WARN L240 tifierPushTermWalker]: treesize reduction 89, result has 49.1 percent of original size [2021-05-06 12:03:56,294 WARN L245 tifierPushTermWalker]: treesize reduction 89, result has 49.1 percent of original size 86 [2021-05-06 12:03:56,301 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,303 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:56,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:56,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:56,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:56,410 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:56,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1873873823] [2021-05-06 12:03:56,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1873873823] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:56,411 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:56,411 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:03:56,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664150789] [2021-05-06 12:03:56,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:03:56,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:56,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:03:56,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:03:56,412 INFO L87 Difference]: Start difference. First operand 191 states and 237 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:56,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:56,562 INFO L93 Difference]: Finished difference Result 354 states and 440 transitions. [2021-05-06 12:03:56,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 12:03:56,562 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-06 12:03:56,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:56,564 INFO L225 Difference]: With dead ends: 354 [2021-05-06 12:03:56,564 INFO L226 Difference]: Without dead ends: 207 [2021-05-06 12:03:56,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 91.3ms TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-05-06 12:03:56,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-05-06 12:03:56,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 199. [2021-05-06 12:03:56,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 184 states have (on average 1.2391304347826086) internal successors, (228), 187 states have internal predecessors, (228), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:56,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 245 transitions. [2021-05-06 12:03:56,589 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 245 transitions. Word has length 39 [2021-05-06 12:03:56,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:56,589 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 245 transitions. [2021-05-06 12:03:56,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:56,589 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 245 transitions. [2021-05-06 12:03:56,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:03:56,589 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:56,590 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:56,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 12:03:56,590 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:56,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:56,590 INFO L82 PathProgramCache]: Analyzing trace with hash 651130940, now seen corresponding path program 11 times [2021-05-06 12:03:56,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:56,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900716531] [2021-05-06 12:03:56,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:56,598 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:56,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,612 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:56,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:56,628 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:56,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,644 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:56,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,655 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:56,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:56,674 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:56,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,684 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:56,689 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:56,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:56,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:56,720 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:56,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,736 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:56,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:56,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:56,765 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:56,775 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,776 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:56,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:56,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:56,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:56,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:57,095 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:57,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900716531] [2021-05-06 12:03:57,095 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1900716531] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:57,095 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:57,095 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 12:03:57,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530028035] [2021-05-06 12:03:57,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:03:57,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:57,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:03:57,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:03:57,096 INFO L87 Difference]: Start difference. First operand 199 states and 245 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:57,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:57,442 INFO L93 Difference]: Finished difference Result 391 states and 480 transitions. [2021-05-06 12:03:57,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:03:57,442 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:03:57,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:57,443 INFO L225 Difference]: With dead ends: 391 [2021-05-06 12:03:57,443 INFO L226 Difference]: Without dead ends: 247 [2021-05-06 12:03:57,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 326.5ms TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:03:57,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-06 12:03:57,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 208. [2021-05-06 12:03:57,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 193 states have (on average 1.2279792746113989) internal successors, (237), 196 states have internal predecessors, (237), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:57,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 254 transitions. [2021-05-06 12:03:57,461 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 254 transitions. Word has length 40 [2021-05-06 12:03:57,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:57,461 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 254 transitions. [2021-05-06 12:03:57,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:57,461 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 254 transitions. [2021-05-06 12:03:57,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:03:57,462 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:57,462 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:57,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 12:03:57,462 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:57,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:57,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1154307394, now seen corresponding path program 12 times [2021-05-06 12:03:57,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:57,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639311902] [2021-05-06 12:03:57,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:57,471 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:57,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:57,492 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:57,500 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:57,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:57,515 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:57,525 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,526 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,535 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:57,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:57,546 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:57,555 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:57,556 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:57,559 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:57,571 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:57,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:57,589 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:57,602 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:57,605 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:57,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:57,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:57,634 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:57,644 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:57,645 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:57,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:57,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:57,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,697 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:57,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:57,961 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:57,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639311902] [2021-05-06 12:03:57,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1639311902] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:57,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:57,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 12:03:57,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578232050] [2021-05-06 12:03:57,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 12:03:57,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:57,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 12:03:57,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:03:57,963 INFO L87 Difference]: Start difference. First operand 208 states and 254 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:58,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:58,288 INFO L93 Difference]: Finished difference Result 409 states and 498 transitions. [2021-05-06 12:03:58,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:03:58,289 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:03:58,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:58,290 INFO L225 Difference]: With dead ends: 409 [2021-05-06 12:03:58,290 INFO L226 Difference]: Without dead ends: 256 [2021-05-06 12:03:58,290 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 317.8ms TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:03:58,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-05-06 12:03:58,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 208. [2021-05-06 12:03:58,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 193 states have (on average 1.2279792746113989) internal successors, (237), 196 states have internal predecessors, (237), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:58,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 254 transitions. [2021-05-06 12:03:58,309 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 254 transitions. Word has length 40 [2021-05-06 12:03:58,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:58,309 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 254 transitions. [2021-05-06 12:03:58,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:58,309 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 254 transitions. [2021-05-06 12:03:58,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:03:58,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:58,310 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:58,310 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-06 12:03:58,310 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:58,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:58,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1971955844, now seen corresponding path program 13 times [2021-05-06 12:03:58,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:58,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1922054643] [2021-05-06 12:03:58,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:58,317 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:58,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,320 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,327 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:58,328 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:58,346 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:58,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:58,360 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:58,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:58,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:58,389 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:58,400 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:58,400 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:58,403 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:58,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,405 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:58,415 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:58,432 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:58,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:58,446 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:58,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:58,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:58,476 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:58,486 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:58,487 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:58,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:58,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:58,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:58,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:58,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:58,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:58,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:58,825 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:58,825 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1922054643] [2021-05-06 12:03:58,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1922054643] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:58,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:58,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:03:58,826 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771158582] [2021-05-06 12:03:58,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:03:58,827 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:58,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:03:58,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:03:58,827 INFO L87 Difference]: Start difference. First operand 208 states and 254 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:59,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:59,079 INFO L93 Difference]: Finished difference Result 394 states and 479 transitions. [2021-05-06 12:03:59,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:03:59,079 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:03:59,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:59,080 INFO L225 Difference]: With dead ends: 394 [2021-05-06 12:03:59,080 INFO L226 Difference]: Without dead ends: 241 [2021-05-06 12:03:59,081 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 314.6ms TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:03:59,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-05-06 12:03:59,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 208. [2021-05-06 12:03:59,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 193 states have (on average 1.2279792746113989) internal successors, (237), 196 states have internal predecessors, (237), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:59,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 254 transitions. [2021-05-06 12:03:59,101 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 254 transitions. Word has length 40 [2021-05-06 12:03:59,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:59,101 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 254 transitions. [2021-05-06 12:03:59,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:59,101 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 254 transitions. [2021-05-06 12:03:59,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:03:59,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:59,101 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:59,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 12:03:59,102 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:59,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:59,102 INFO L82 PathProgramCache]: Analyzing trace with hash 734663550, now seen corresponding path program 14 times [2021-05-06 12:03:59,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:59,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133549343] [2021-05-06 12:03:59,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:59,109 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:59,110 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:59,120 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:59,137 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:59,148 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,151 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:59,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:59,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:59,178 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:59,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,189 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:59,191 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:59,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,193 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:59,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:59,219 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:59,231 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,233 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:59,234 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:59,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:59,262 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:59,271 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,272 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:59,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:59,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:59,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:59,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:59,603 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:59,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133549343] [2021-05-06 12:03:59,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [133549343] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:59,603 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:59,603 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:03:59,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90247815] [2021-05-06 12:03:59,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:03:59,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:59,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:03:59,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:03:59,604 INFO L87 Difference]: Start difference. First operand 208 states and 254 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:59,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:59,910 INFO L93 Difference]: Finished difference Result 395 states and 484 transitions. [2021-05-06 12:03:59,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:03:59,910 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:03:59,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:59,911 INFO L225 Difference]: With dead ends: 395 [2021-05-06 12:03:59,911 INFO L226 Difference]: Without dead ends: 242 [2021-05-06 12:03:59,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 333.3ms TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:03:59,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-05-06 12:03:59,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 208. [2021-05-06 12:03:59,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 193 states have (on average 1.2279792746113989) internal successors, (237), 196 states have internal predecessors, (237), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:59,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 254 transitions. [2021-05-06 12:03:59,931 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 254 transitions. Word has length 40 [2021-05-06 12:03:59,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:59,931 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 254 transitions. [2021-05-06 12:03:59,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:59,931 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 254 transitions. [2021-05-06 12:03:59,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:03:59,932 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:59,932 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:59,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2021-05-06 12:03:59,932 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:59,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:59,932 INFO L82 PathProgramCache]: Analyzing trace with hash -276453700, now seen corresponding path program 15 times [2021-05-06 12:03:59,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:59,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304758968] [2021-05-06 12:03:59,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:59,940 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:59,949 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:59,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:59,969 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:59,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,980 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:59,984 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:59,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:00,017 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:00,029 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,035 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:00,035 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:00,063 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:00,073 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,074 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:00,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:00,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:00,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:00,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:00,432 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:00,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304758968] [2021-05-06 12:04:00,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [304758968] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:00,432 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:00,432 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:00,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957237487] [2021-05-06 12:04:00,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:00,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:00,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:00,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:00,433 INFO L87 Difference]: Start difference. First operand 208 states and 254 transitions. Second operand has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:00,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:00,733 INFO L93 Difference]: Finished difference Result 409 states and 508 transitions. [2021-05-06 12:04:00,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:00,733 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:04:00,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:00,734 INFO L225 Difference]: With dead ends: 409 [2021-05-06 12:04:00,734 INFO L226 Difference]: Without dead ends: 245 [2021-05-06 12:04:00,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 354.4ms TimeCoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:00,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-06 12:04:00,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 220. [2021-05-06 12:04:00,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 205 states have (on average 1.2341463414634146) internal successors, (253), 208 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:00,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 270 transitions. [2021-05-06 12:04:00,755 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 270 transitions. Word has length 40 [2021-05-06 12:04:00,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:00,756 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 270 transitions. [2021-05-06 12:04:00,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:00,756 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 270 transitions. [2021-05-06 12:04:00,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:00,756 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:00,756 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:00,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 12:04:00,756 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:00,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:00,757 INFO L82 PathProgramCache]: Analyzing trace with hash -1742267585, now seen corresponding path program 16 times [2021-05-06 12:04:00,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:00,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296862604] [2021-05-06 12:04:00,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:00,763 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:00,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:00,775 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:00,790 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:00,802 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,805 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:00,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:00,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:00,833 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:00,842 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,843 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:00,846 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:00,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:00,875 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:00,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,889 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:00,889 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,890 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:00,917 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:00,926 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,927 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:00,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:00,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:00,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:00,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:01,283 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:01,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296862604] [2021-05-06 12:04:01,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [296862604] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:01,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:01,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 12:04:01,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555546535] [2021-05-06 12:04:01,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 12:04:01,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:01,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 12:04:01,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:04:01,284 INFO L87 Difference]: Start difference. First operand 220 states and 270 transitions. Second operand has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:01,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:01,664 INFO L93 Difference]: Finished difference Result 439 states and 535 transitions. [2021-05-06 12:04:01,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:04:01,665 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:01,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:01,666 INFO L225 Difference]: With dead ends: 439 [2021-05-06 12:04:01,666 INFO L226 Difference]: Without dead ends: 277 [2021-05-06 12:04:01,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 363.3ms TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:01,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-05-06 12:04:01,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 229. [2021-05-06 12:04:01,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2242990654205608) internal successors, (262), 217 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:01,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 279 transitions. [2021-05-06 12:04:01,689 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 279 transitions. Word has length 43 [2021-05-06 12:04:01,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:01,689 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 279 transitions. [2021-05-06 12:04:01,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:01,689 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 279 transitions. [2021-05-06 12:04:01,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:01,689 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:01,689 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:01,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2021-05-06 12:04:01,690 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:01,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:01,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1680227971, now seen corresponding path program 17 times [2021-05-06 12:04:01,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:01,690 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [253727243] [2021-05-06 12:04:01,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:01,696 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:01,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:01,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:01,726 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:01,737 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,740 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:01,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,743 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:01,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:01,768 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:01,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:01,782 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:01,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,795 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:01,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:01,811 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:01,823 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,825 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:01,826 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,836 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:01,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:01,853 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:01,864 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,864 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:01,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:01,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:01,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:01,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:01,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:01,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:01,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:02,225 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:02,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [253727243] [2021-05-06 12:04:02,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [253727243] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:02,225 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:02,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:04:02,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257529342] [2021-05-06 12:04:02,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:04:02,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:02,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:04:02,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:04:02,227 INFO L87 Difference]: Start difference. First operand 229 states and 279 transitions. Second operand has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:02,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:02,592 INFO L93 Difference]: Finished difference Result 457 states and 553 transitions. [2021-05-06 12:04:02,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:04:02,592 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:02,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:02,593 INFO L225 Difference]: With dead ends: 457 [2021-05-06 12:04:02,593 INFO L226 Difference]: Without dead ends: 286 [2021-05-06 12:04:02,594 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 367.4ms TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:02,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-05-06 12:04:02,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 229. [2021-05-06 12:04:02,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2242990654205608) internal successors, (262), 217 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:02,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 279 transitions. [2021-05-06 12:04:02,617 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 279 transitions. Word has length 43 [2021-05-06 12:04:02,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:02,618 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 279 transitions. [2021-05-06 12:04:02,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:02,618 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 279 transitions. [2021-05-06 12:04:02,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:02,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:02,618 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:02,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2021-05-06 12:04:02,618 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:02,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:02,619 INFO L82 PathProgramCache]: Analyzing trace with hash 809300991, now seen corresponding path program 18 times [2021-05-06 12:04:02,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:02,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937507529] [2021-05-06 12:04:02,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:02,625 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:02,636 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:02,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:02,654 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:02,665 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,668 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:02,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:02,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:02,696 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:02,705 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,706 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,709 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:02,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:02,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:02,735 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:02,747 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,750 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:02,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:02,772 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:02,779 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:02,788 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,789 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:02,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:02,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:02,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:02,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:02,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:02,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:03,196 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:03,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937507529] [2021-05-06 12:04:03,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [937507529] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:03,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:03,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:04:03,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145060851] [2021-05-06 12:04:03,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:04:03,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:03,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:04:03,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:03,197 INFO L87 Difference]: Start difference. First operand 229 states and 279 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:03,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:03,472 INFO L93 Difference]: Finished difference Result 442 states and 534 transitions. [2021-05-06 12:04:03,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:04:03,472 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:03,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:03,473 INFO L225 Difference]: With dead ends: 442 [2021-05-06 12:04:03,473 INFO L226 Difference]: Without dead ends: 271 [2021-05-06 12:04:03,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 9 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 375.0ms TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:03,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-05-06 12:04:03,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 229. [2021-05-06 12:04:03,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2242990654205608) internal successors, (262), 217 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:03,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 279 transitions. [2021-05-06 12:04:03,504 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 279 transitions. Word has length 43 [2021-05-06 12:04:03,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:03,504 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 279 transitions. [2021-05-06 12:04:03,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:03,504 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 279 transitions. [2021-05-06 12:04:03,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:03,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:03,505 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:03,505 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 12:04:03,505 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:03,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:03,505 INFO L82 PathProgramCache]: Analyzing trace with hash -8347459, now seen corresponding path program 19 times [2021-05-06 12:04:03,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:03,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126271623] [2021-05-06 12:04:03,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:03,511 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:03,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,520 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:03,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:03,538 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:03,549 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,552 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:03,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:03,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:03,580 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:03,603 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,604 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:03,607 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:03,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,619 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:03,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:03,636 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:03,648 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,650 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:03,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:03,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:03,678 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:03,688 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,688 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:03,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:03,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:03,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,739 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:03,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:04,072 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:04,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126271623] [2021-05-06 12:04:04,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1126271623] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:04,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:04,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:04,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974310497] [2021-05-06 12:04:04,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:04,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:04,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:04,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:04,073 INFO L87 Difference]: Start difference. First operand 229 states and 279 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:04,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:04,412 INFO L93 Difference]: Finished difference Result 439 states and 535 transitions. [2021-05-06 12:04:04,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:04,412 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:04,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:04,413 INFO L225 Difference]: With dead ends: 439 [2021-05-06 12:04:04,413 INFO L226 Difference]: Without dead ends: 268 [2021-05-06 12:04:04,414 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 8 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 385.3ms TimeCoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:04,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-05-06 12:04:04,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 229. [2021-05-06 12:04:04,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2242990654205608) internal successors, (262), 217 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:04,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 279 transitions. [2021-05-06 12:04:04,438 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 279 transitions. Word has length 43 [2021-05-06 12:04:04,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:04,438 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 279 transitions. [2021-05-06 12:04:04,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:04,438 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 279 transitions. [2021-05-06 12:04:04,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:04,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:04,439 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:04,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106 [2021-05-06 12:04:04,439 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:04,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:04,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1596695361, now seen corresponding path program 20 times [2021-05-06 12:04:04,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:04,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436953024] [2021-05-06 12:04:04,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:04,445 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:04,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:04,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:04,475 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:04,487 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,489 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:04,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,499 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:04,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:04,519 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:04,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:04,532 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:04,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:04,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:04,559 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:04,571 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,573 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:04,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:04,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:04,606 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:04,616 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:04,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:04,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:04,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:04,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:04,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:04,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:04,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:05,029 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:05,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436953024] [2021-05-06 12:04:05,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1436953024] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:05,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:05,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:05,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382234485] [2021-05-06 12:04:05,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:05,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:05,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:05,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:05,030 INFO L87 Difference]: Start difference. First operand 229 states and 279 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:05,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:05,451 INFO L93 Difference]: Finished difference Result 434 states and 530 transitions. [2021-05-06 12:04:05,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:05,452 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:05,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:05,452 INFO L225 Difference]: With dead ends: 434 [2021-05-06 12:04:05,452 INFO L226 Difference]: Without dead ends: 263 [2021-05-06 12:04:05,453 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 400.4ms TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:05,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-05-06 12:04:05,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 229. [2021-05-06 12:04:05,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2242990654205608) internal successors, (262), 217 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:05,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 279 transitions. [2021-05-06 12:04:05,478 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 279 transitions. Word has length 43 [2021-05-06 12:04:05,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:05,478 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 279 transitions. [2021-05-06 12:04:05,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:05,478 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 279 transitions. [2021-05-06 12:04:05,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:05,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:05,479 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:05,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable111 [2021-05-06 12:04:05,479 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:05,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:05,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1687154685, now seen corresponding path program 21 times [2021-05-06 12:04:05,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:05,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718741242] [2021-05-06 12:04:05,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:05,484 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:05,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,494 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:05,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:05,512 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:05,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:05,531 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:04:05,533 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:05,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:05,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:05,562 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:05,574 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:05,577 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:05,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,589 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:05,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:05,608 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:05,618 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:05,618 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:05,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:05,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:05,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:05,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:05,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:05,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:05,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:06,044 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:06,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718741242] [2021-05-06 12:04:06,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1718741242] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:06,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:06,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:06,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705255062] [2021-05-06 12:04:06,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:06,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:06,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:06,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:06,045 INFO L87 Difference]: Start difference. First operand 229 states and 279 transitions. Second operand has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:06,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:06,365 INFO L93 Difference]: Finished difference Result 448 states and 554 transitions. [2021-05-06 12:04:06,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:06,366 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:06,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:06,366 INFO L225 Difference]: With dead ends: 448 [2021-05-06 12:04:06,367 INFO L226 Difference]: Without dead ends: 266 [2021-05-06 12:04:06,367 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 423.5ms TimeCoverageRelationStatistics Valid=130, Invalid=520, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:06,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-06 12:04:06,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 241. [2021-05-06 12:04:06,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 226 states have (on average 1.2300884955752212) internal successors, (278), 229 states have internal predecessors, (278), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:06,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 295 transitions. [2021-05-06 12:04:06,403 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 295 transitions. Word has length 43 [2021-05-06 12:04:06,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:06,403 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 295 transitions. [2021-05-06 12:04:06,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:06,403 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 295 transitions. [2021-05-06 12:04:06,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 12:04:06,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:06,404 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:06,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115 [2021-05-06 12:04:06,404 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:06,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:06,404 INFO L82 PathProgramCache]: Analyzing trace with hash -2117823645, now seen corresponding path program 2 times [2021-05-06 12:04:06,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:06,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683423416] [2021-05-06 12:04:06,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:06,414 WARN L240 tifierPushTermWalker]: treesize reduction 96, result has 45.1 percent of original size [2021-05-06 12:04:06,440 WARN L245 tifierPushTermWalker]: treesize reduction 96, result has 45.1 percent of original size 79 [2021-05-06 12:04:06,445 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,451 WARN L240 tifierPushTermWalker]: treesize reduction 92, result has 44.2 percent of original size [2021-05-06 12:04:06,487 WARN L245 tifierPushTermWalker]: treesize reduction 92, result has 44.2 percent of original size 73 [2021-05-06 12:04:06,514 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,515 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:06,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:06,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:06,612 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:06,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683423416] [2021-05-06 12:04:06,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1683423416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:06,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:06,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 12:04:06,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244029286] [2021-05-06 12:04:06,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 12:04:06,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:06,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 12:04:06,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-05-06 12:04:06,613 INFO L87 Difference]: Start difference. First operand 241 states and 295 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:06,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:06,752 INFO L93 Difference]: Finished difference Result 450 states and 550 transitions. [2021-05-06 12:04:06,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 12:04:06,753 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-06 12:04:06,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:06,754 INFO L225 Difference]: With dead ends: 450 [2021-05-06 12:04:06,754 INFO L226 Difference]: Without dead ends: 261 [2021-05-06 12:04:06,754 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 105.1ms TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-05-06 12:04:06,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-05-06 12:04:06,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 253. [2021-05-06 12:04:06,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 238 states have (on average 1.218487394957983) internal successors, (290), 241 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:06,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 307 transitions. [2021-05-06 12:04:06,782 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 307 transitions. Word has length 45 [2021-05-06 12:04:06,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:06,782 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 307 transitions. [2021-05-06 12:04:06,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:06,782 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 307 transitions. [2021-05-06 12:04:06,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:06,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:06,782 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:06,782 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 12:04:06,783 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:06,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:06,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1569322332, now seen corresponding path program 22 times [2021-05-06 12:04:06,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:06,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687954045] [2021-05-06 12:04:06,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:06,789 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:06,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:06,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:06,817 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:06,829 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,832 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:06,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:06,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:06,860 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:06,870 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,870 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,873 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:06,873 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,883 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,900 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:06,911 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,914 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:06,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,942 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:06,951 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,952 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:06,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:06,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:07,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:07,362 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:07,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687954045] [2021-05-06 12:04:07,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [687954045] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:07,363 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:07,363 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:04:07,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161344746] [2021-05-06 12:04:07,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:04:07,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:07,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:04:07,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:04:07,364 INFO L87 Difference]: Start difference. First operand 253 states and 307 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:07,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:07,778 INFO L93 Difference]: Finished difference Result 508 states and 611 transitions. [2021-05-06 12:04:07,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:04:07,779 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:07,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:07,780 INFO L225 Difference]: With dead ends: 508 [2021-05-06 12:04:07,780 INFO L226 Difference]: Without dead ends: 319 [2021-05-06 12:04:07,780 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 12 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 410.6ms TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:07,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-05-06 12:04:07,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 262. [2021-05-06 12:04:07,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2105263157894737) internal successors, (299), 250 states have internal predecessors, (299), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:07,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 316 transitions. [2021-05-06 12:04:07,820 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 316 transitions. Word has length 46 [2021-05-06 12:04:07,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:07,820 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 316 transitions. [2021-05-06 12:04:07,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:07,820 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 316 transitions. [2021-05-06 12:04:07,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:07,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:07,821 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:07,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121 [2021-05-06 12:04:07,821 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:07,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:07,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1339441570, now seen corresponding path program 23 times [2021-05-06 12:04:07,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:07,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005983616] [2021-05-06 12:04:07,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:07,827 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:07,828 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:07,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:07,836 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:07,838 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:07,854 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:07,866 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:07,868 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:07,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:07,870 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:07,879 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:07,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:07,896 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:07,905 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:07,906 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:07,909 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:07,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:07,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:07,948 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:07,957 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:07,974 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:07,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:07,989 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:07,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:07,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:08,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:08,019 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:08,028 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:08,029 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:08,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:08,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:08,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:08,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:08,442 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:08,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005983616] [2021-05-06 12:04:08,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2005983616] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:08,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:08,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:04:08,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972339015] [2021-05-06 12:04:08,443 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:04:08,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:08,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:04:08,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:04:08,444 INFO L87 Difference]: Start difference. First operand 262 states and 316 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:08,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:08,859 INFO L93 Difference]: Finished difference Result 526 states and 629 transitions. [2021-05-06 12:04:08,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:04:08,859 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:08,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:08,860 INFO L225 Difference]: With dead ends: 526 [2021-05-06 12:04:08,860 INFO L226 Difference]: Without dead ends: 328 [2021-05-06 12:04:08,861 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 12 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 417.9ms TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:08,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2021-05-06 12:04:08,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 262. [2021-05-06 12:04:08,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2105263157894737) internal successors, (299), 250 states have internal predecessors, (299), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:08,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 316 transitions. [2021-05-06 12:04:08,894 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 316 transitions. Word has length 46 [2021-05-06 12:04:08,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:08,895 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 316 transitions. [2021-05-06 12:04:08,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:08,895 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 316 transitions. [2021-05-06 12:04:08,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:08,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:08,895 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:08,895 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126 [2021-05-06 12:04:08,895 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:08,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:08,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1277401956, now seen corresponding path program 24 times [2021-05-06 12:04:08,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:08,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1090402644] [2021-05-06 12:04:08,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:08,902 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:08,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,903 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:08,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:08,928 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:08,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:08,942 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:08,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:08,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:08,971 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:08,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:08,981 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:08,984 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:08,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:08,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:09,015 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:09,027 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:09,029 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:09,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:09,051 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:09,058 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:09,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:09,068 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:09,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:09,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:09,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:09,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:09,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:09,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:09,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:09,489 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:09,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1090402644] [2021-05-06 12:04:09,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1090402644] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:09,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:09,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:09,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681745206] [2021-05-06 12:04:09,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:09,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:09,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:09,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:09,491 INFO L87 Difference]: Start difference. First operand 262 states and 316 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:09,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:09,899 INFO L93 Difference]: Finished difference Result 511 states and 610 transitions. [2021-05-06 12:04:09,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:09,899 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:09,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:09,900 INFO L225 Difference]: With dead ends: 511 [2021-05-06 12:04:09,900 INFO L226 Difference]: Without dead ends: 313 [2021-05-06 12:04:09,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 12 SyntacticMatches, 11 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 408.2ms TimeCoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:09,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-05-06 12:04:09,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 262. [2021-05-06 12:04:09,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2105263157894737) internal successors, (299), 250 states have internal predecessors, (299), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:09,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 316 transitions. [2021-05-06 12:04:09,934 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 316 transitions. Word has length 46 [2021-05-06 12:04:09,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:09,934 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 316 transitions. [2021-05-06 12:04:09,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:09,935 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 316 transitions. [2021-05-06 12:04:09,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:09,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:09,935 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:09,935 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 12:04:09,935 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:09,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:09,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1212127006, now seen corresponding path program 25 times [2021-05-06 12:04:09,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:09,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [410288958] [2021-05-06 12:04:09,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:09,941 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:09,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:09,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:09,970 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:09,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:09,984 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:09,992 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,002 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:10,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:10,012 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:10,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:10,023 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:10,026 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:10,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:10,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:10,055 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:10,066 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:10,069 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:10,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:10,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:10,097 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:10,107 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:10,107 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:10,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:10,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:10,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:10,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:10,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:10,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:10,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:10,527 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:10,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [410288958] [2021-05-06 12:04:10,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [410288958] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:10,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:10,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:10,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118459729] [2021-05-06 12:04:10,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:10,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:10,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:10,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:10,528 INFO L87 Difference]: Start difference. First operand 262 states and 316 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:10,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:10,913 INFO L93 Difference]: Finished difference Result 508 states and 611 transitions. [2021-05-06 12:04:10,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:10,913 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:10,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:10,914 INFO L225 Difference]: With dead ends: 508 [2021-05-06 12:04:10,914 INFO L226 Difference]: Without dead ends: 310 [2021-05-06 12:04:10,915 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 12 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 425.7ms TimeCoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:10,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-05-06 12:04:10,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 262. [2021-05-06 12:04:10,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2105263157894737) internal successors, (299), 250 states have internal predecessors, (299), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:10,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 316 transitions. [2021-05-06 12:04:10,949 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 316 transitions. Word has length 46 [2021-05-06 12:04:10,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:10,949 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 316 transitions. [2021-05-06 12:04:10,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:10,949 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 316 transitions. [2021-05-06 12:04:10,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:10,955 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:10,955 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:10,955 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136 [2021-05-06 12:04:10,955 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:10,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:10,956 INFO L82 PathProgramCache]: Analyzing trace with hash 394478556, now seen corresponding path program 26 times [2021-05-06 12:04:10,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:10,956 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073619966] [2021-05-06 12:04:10,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:10,962 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:10,974 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,983 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:10,985 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:10,993 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:11,006 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,008 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:11,009 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:11,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:11,038 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:11,048 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,049 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:11,056 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:11,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:11,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:11,085 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:11,098 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,101 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:11,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:11,125 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:11,132 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:11,143 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,143 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:11,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:11,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:11,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:11,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:11,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:11,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:11,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:11,583 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:11,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073619966] [2021-05-06 12:04:11,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1073619966] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:11,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:11,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:11,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245217543] [2021-05-06 12:04:11,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:11,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:11,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:11,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:11,585 INFO L87 Difference]: Start difference. First operand 262 states and 316 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:11,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:11,962 INFO L93 Difference]: Finished difference Result 499 states and 602 transitions. [2021-05-06 12:04:11,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:11,962 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:11,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:11,963 INFO L225 Difference]: With dead ends: 499 [2021-05-06 12:04:11,963 INFO L226 Difference]: Without dead ends: 301 [2021-05-06 12:04:11,964 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 12 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 444.6ms TimeCoverageRelationStatistics Valid=123, Invalid=527, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:11,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-05-06 12:04:12,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 262. [2021-05-06 12:04:12,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2105263157894737) internal successors, (299), 250 states have internal predecessors, (299), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:12,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 316 transitions. [2021-05-06 12:04:12,014 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 316 transitions. Word has length 46 [2021-05-06 12:04:12,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:12,014 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 316 transitions. [2021-05-06 12:04:12,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:12,014 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 316 transitions. [2021-05-06 12:04:12,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:12,014 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:12,014 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:12,015 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141 [2021-05-06 12:04:12,015 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:12,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:12,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1193869346, now seen corresponding path program 27 times [2021-05-06 12:04:12,015 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:12,015 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398402166] [2021-05-06 12:04:12,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:12,020 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:12,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,023 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:12,031 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:12,047 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:12,059 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,061 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:12,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,072 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:12,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:12,089 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:12,098 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,099 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:12,101 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:12,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:12,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:12,130 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:12,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,145 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:12,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:12,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:12,173 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:12,183 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,183 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:12,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:12,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:12,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:12,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:12,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:12,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:12,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:12,634 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:12,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398402166] [2021-05-06 12:04:12,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [398402166] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:12,634 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:12,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:12,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712330348] [2021-05-06 12:04:12,635 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:12,635 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:12,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:12,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:12,636 INFO L87 Difference]: Start difference. First operand 262 states and 316 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:13,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:13,012 INFO L93 Difference]: Finished difference Result 494 states and 597 transitions. [2021-05-06 12:04:13,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:13,013 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:13,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:13,014 INFO L225 Difference]: With dead ends: 494 [2021-05-06 12:04:13,014 INFO L226 Difference]: Without dead ends: 296 [2021-05-06 12:04:13,015 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 7 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 445.2ms TimeCoverageRelationStatistics Valid=133, Invalid=569, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:13,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-05-06 12:04:13,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 262. [2021-05-06 12:04:13,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2105263157894737) internal successors, (299), 250 states have internal predecessors, (299), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:13,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 316 transitions. [2021-05-06 12:04:13,049 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 316 transitions. Word has length 46 [2021-05-06 12:04:13,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:13,050 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 316 transitions. [2021-05-06 12:04:13,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:13,050 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 316 transitions. [2021-05-06 12:04:13,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:13,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:13,050 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:13,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 12:04:13,050 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:13,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:13,050 INFO L82 PathProgramCache]: Analyzing trace with hash 2089980700, now seen corresponding path program 28 times [2021-05-06 12:04:13,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:13,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574103295] [2021-05-06 12:04:13,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:13,055 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:13,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:13,077 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:13,083 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:13,093 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,094 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:04:13,096 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:13,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:13,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:13,122 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:13,134 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,136 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:13,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:13,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:13,165 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:13,174 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,175 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:13,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:13,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:13,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:13,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:13,630 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:13,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574103295] [2021-05-06 12:04:13,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1574103295] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:13,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:13,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:13,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964804658] [2021-05-06 12:04:13,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:13,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:13,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:13,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=490, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:13,631 INFO L87 Difference]: Start difference. First operand 262 states and 316 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:14,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:14,064 INFO L93 Difference]: Finished difference Result 508 states and 621 transitions. [2021-05-06 12:04:14,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:14,064 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:14,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:14,065 INFO L225 Difference]: With dead ends: 508 [2021-05-06 12:04:14,065 INFO L226 Difference]: Without dead ends: 299 [2021-05-06 12:04:14,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 12 SyntacticMatches, 7 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 462.4ms TimeCoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:14,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-05-06 12:04:14,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 274. [2021-05-06 12:04:14,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 259 states have (on average 1.2162162162162162) internal successors, (315), 262 states have internal predecessors, (315), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:14,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 332 transitions. [2021-05-06 12:04:14,101 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 332 transitions. Word has length 46 [2021-05-06 12:04:14,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:14,101 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 332 transitions. [2021-05-06 12:04:14,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:14,101 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 332 transitions. [2021-05-06 12:04:14,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:14,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:14,102 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:14,102 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150 [2021-05-06 12:04:14,102 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:14,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:14,102 INFO L82 PathProgramCache]: Analyzing trace with hash 1745750559, now seen corresponding path program 29 times [2021-05-06 12:04:14,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:14,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454625945] [2021-05-06 12:04:14,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:14,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:14,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:14,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:14,134 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:14,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,148 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:14,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:14,169 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:14,176 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:14,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,186 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:14,189 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:14,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:14,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:14,216 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:14,227 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,230 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:14,239 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:14,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:14,258 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:14,268 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,269 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:14,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:14,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:14,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:14,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:14,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:14,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:14,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:14,701 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:14,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454625945] [2021-05-06 12:04:14,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1454625945] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:14,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:14,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:04:14,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549251662] [2021-05-06 12:04:14,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:04:14,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:14,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:04:14,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:04:14,702 INFO L87 Difference]: Start difference. First operand 274 states and 332 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:15,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:15,176 INFO L93 Difference]: Finished difference Result 556 states and 666 transitions. [2021-05-06 12:04:15,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:04:15,177 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:15,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:15,178 INFO L225 Difference]: With dead ends: 556 [2021-05-06 12:04:15,178 INFO L226 Difference]: Without dead ends: 349 [2021-05-06 12:04:15,178 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 13 SyntacticMatches, 14 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 388.6ms TimeCoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:15,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-05-06 12:04:15,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 283. [2021-05-06 12:04:15,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.208955223880597) internal successors, (324), 271 states have internal predecessors, (324), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:15,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 341 transitions. [2021-05-06 12:04:15,219 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 341 transitions. Word has length 49 [2021-05-06 12:04:15,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:15,219 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 341 transitions. [2021-05-06 12:04:15,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:15,220 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 341 transitions. [2021-05-06 12:04:15,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:15,220 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:15,220 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:15,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 12:04:15,220 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:15,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:15,220 INFO L82 PathProgramCache]: Analyzing trace with hash 2020510173, now seen corresponding path program 30 times [2021-05-06 12:04:15,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:15,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799761430] [2021-05-06 12:04:15,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:15,226 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:15,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:15,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:15,253 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:15,265 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,267 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:15,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:15,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:15,294 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:15,304 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,304 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:15,307 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:15,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:15,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:15,333 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:15,344 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,347 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:15,355 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:15,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:15,375 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:15,385 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,385 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:15,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:15,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:15,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:15,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:15,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:15,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:15,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:15,855 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:15,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799761430] [2021-05-06 12:04:15,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [799761430] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:15,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:15,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:15,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274431783] [2021-05-06 12:04:15,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:15,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:15,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:15,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:15,857 INFO L87 Difference]: Start difference. First operand 283 states and 341 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:16,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:16,327 INFO L93 Difference]: Finished difference Result 574 states and 684 transitions. [2021-05-06 12:04:16,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:16,327 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:16,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:16,328 INFO L225 Difference]: With dead ends: 574 [2021-05-06 12:04:16,328 INFO L226 Difference]: Without dead ends: 358 [2021-05-06 12:04:16,329 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 12 SyntacticMatches, 14 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 476.9ms TimeCoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:16,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-05-06 12:04:16,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 283. [2021-05-06 12:04:16,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.208955223880597) internal successors, (324), 271 states have internal predecessors, (324), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:16,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 341 transitions. [2021-05-06 12:04:16,373 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 341 transitions. Word has length 49 [2021-05-06 12:04:16,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:16,373 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 341 transitions. [2021-05-06 12:04:16,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:16,374 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 341 transitions. [2021-05-06 12:04:16,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:16,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:16,374 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:16,374 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable160 [2021-05-06 12:04:16,374 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:16,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:16,374 INFO L82 PathProgramCache]: Analyzing trace with hash -888253729, now seen corresponding path program 31 times [2021-05-06 12:04:16,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:16,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100408403] [2021-05-06 12:04:16,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:16,380 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:16,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:16,390 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:16,407 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:16,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:16,421 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:16,430 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,439 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:16,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:16,450 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:16,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:16,460 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:16,462 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:16,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:16,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:16,490 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:16,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:16,504 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:16,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:16,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:16,533 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:16,554 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:16,555 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:16,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:16,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:16,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,607 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:16,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:17,011 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:17,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100408403] [2021-05-06 12:04:17,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2100408403] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:17,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:17,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:17,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226327848] [2021-05-06 12:04:17,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:17,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:17,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:17,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:17,012 INFO L87 Difference]: Start difference. First operand 283 states and 341 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:17,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:17,536 INFO L93 Difference]: Finished difference Result 565 states and 675 transitions. [2021-05-06 12:04:17,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:17,537 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:17,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:17,538 INFO L225 Difference]: With dead ends: 565 [2021-05-06 12:04:17,538 INFO L226 Difference]: Without dead ends: 349 [2021-05-06 12:04:17,538 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 12 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 457.5ms TimeCoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:17,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-05-06 12:04:17,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 283. [2021-05-06 12:04:17,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.208955223880597) internal successors, (324), 271 states have internal predecessors, (324), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:17,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 341 transitions. [2021-05-06 12:04:17,585 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 341 transitions. Word has length 49 [2021-05-06 12:04:17,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:17,585 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 341 transitions. [2021-05-06 12:04:17,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:17,585 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 341 transitions. [2021-05-06 12:04:17,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:17,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:17,585 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:17,585 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable165 [2021-05-06 12:04:17,585 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:17,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:17,586 INFO L82 PathProgramCache]: Analyzing trace with hash -826214115, now seen corresponding path program 32 times [2021-05-06 12:04:17,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:17,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1424051697] [2021-05-06 12:04:17,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:17,592 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:17,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:17,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:17,629 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:17,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:17,643 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:17,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:17,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:17,672 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:17,682 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:17,682 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:17,685 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:17,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:17,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:17,711 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:17,723 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:17,726 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:17,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:17,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:17,754 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:17,764 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:17,764 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:17,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:17,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:17,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:17,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:17,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:17,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:17,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:18,174 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:18,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1424051697] [2021-05-06 12:04:18,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1424051697] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:18,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:18,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:18,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812692799] [2021-05-06 12:04:18,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:18,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:18,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:18,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:18,176 INFO L87 Difference]: Start difference. First operand 283 states and 341 transitions. Second operand has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:18,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:18,693 INFO L93 Difference]: Finished difference Result 556 states and 666 transitions. [2021-05-06 12:04:18,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:18,694 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:18,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:18,695 INFO L225 Difference]: With dead ends: 556 [2021-05-06 12:04:18,695 INFO L226 Difference]: Without dead ends: 340 [2021-05-06 12:04:18,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 12 SyntacticMatches, 12 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 427.5ms TimeCoverageRelationStatistics Valid=116, Invalid=534, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:18,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-05-06 12:04:18,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 283. [2021-05-06 12:04:18,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.208955223880597) internal successors, (324), 271 states have internal predecessors, (324), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:18,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 341 transitions. [2021-05-06 12:04:18,761 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 341 transitions. Word has length 49 [2021-05-06 12:04:18,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:18,763 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 341 transitions. [2021-05-06 12:04:18,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:18,763 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 341 transitions. [2021-05-06 12:04:18,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:18,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:18,763 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:18,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2021-05-06 12:04:18,764 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:18,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:18,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1663314847, now seen corresponding path program 33 times [2021-05-06 12:04:18,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:18,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609283312] [2021-05-06 12:04:18,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:18,776 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:18,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,778 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:18,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:18,805 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:18,817 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,821 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:18,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:18,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:18,852 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:18,862 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,863 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:18,865 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:18,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:18,879 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:18,896 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:18,908 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,911 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:18,920 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:18,934 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:18,941 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:18,951 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,952 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:18,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:18,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:19,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:19,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:19,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:19,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:19,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:19,363 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:19,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609283312] [2021-05-06 12:04:19,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [609283312] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:19,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:19,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:19,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126303300] [2021-05-06 12:04:19,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:19,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:19,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:19,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:19,365 INFO L87 Difference]: Start difference. First operand 283 states and 341 transitions. Second operand has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:19,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:19,717 INFO L93 Difference]: Finished difference Result 547 states and 657 transitions. [2021-05-06 12:04:19,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:19,718 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:19,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:19,719 INFO L225 Difference]: With dead ends: 547 [2021-05-06 12:04:19,719 INFO L226 Difference]: Without dead ends: 331 [2021-05-06 12:04:19,719 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 13 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 383.5ms TimeCoverageRelationStatistics Valid=126, Invalid=576, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:19,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-05-06 12:04:19,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 283. [2021-05-06 12:04:19,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.208955223880597) internal successors, (324), 271 states have internal predecessors, (324), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:19,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 341 transitions. [2021-05-06 12:04:19,786 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 341 transitions. Word has length 49 [2021-05-06 12:04:19,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:19,786 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 341 transitions. [2021-05-06 12:04:19,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:19,786 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 341 transitions. [2021-05-06 12:04:19,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:19,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:19,786 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:19,787 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable175 [2021-05-06 12:04:19,787 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:19,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:19,787 INFO L82 PathProgramCache]: Analyzing trace with hash 845666397, now seen corresponding path program 34 times [2021-05-06 12:04:19,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:19,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163700036] [2021-05-06 12:04:19,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:19,794 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:19,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:19,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:19,819 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:19,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:19,830 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:19,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:19,856 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:19,870 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:19,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:19,881 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:19,884 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:19,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,903 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:19,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:19,911 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:19,922 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:19,924 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:19,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,934 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:19,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:19,952 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:19,961 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:19,961 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:19,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:20,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:20,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:20,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:20,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:20,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:20,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:20,626 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:20,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163700036] [2021-05-06 12:04:20,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [163700036] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:20,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:20,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:04:20,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906215573] [2021-05-06 12:04:20,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:04:20,627 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:20,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:04:20,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:20,627 INFO L87 Difference]: Start difference. First operand 283 states and 341 transitions. Second operand has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:21,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:21,204 INFO L93 Difference]: Finished difference Result 540 states and 646 transitions. [2021-05-06 12:04:21,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:04:21,204 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:21,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:21,205 INFO L225 Difference]: With dead ends: 540 [2021-05-06 12:04:21,205 INFO L226 Difference]: Without dead ends: 324 [2021-05-06 12:04:21,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 7 SyntacticMatches, 9 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 646.2ms TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:04:21,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-05-06 12:04:21,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 283. [2021-05-06 12:04:21,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.208955223880597) internal successors, (324), 271 states have internal predecessors, (324), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:21,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 341 transitions. [2021-05-06 12:04:21,252 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 341 transitions. Word has length 49 [2021-05-06 12:04:21,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:21,253 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 341 transitions. [2021-05-06 12:04:21,253 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:21,253 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 341 transitions. [2021-05-06 12:04:21,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:21,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:21,253 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:21,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable180 [2021-05-06 12:04:21,253 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:21,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:21,254 INFO L82 PathProgramCache]: Analyzing trace with hash -742681505, now seen corresponding path program 35 times [2021-05-06 12:04:21,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:21,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083368870] [2021-05-06 12:04:21,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:21,259 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:21,270 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:21,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:21,287 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:21,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:21,302 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:21,302 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,303 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:21,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:21,330 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:21,340 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:21,341 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:21,343 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:21,354 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,355 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,363 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:21,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:21,372 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:21,384 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:21,387 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:21,396 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:21,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:21,416 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:21,427 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:21,427 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:21,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:21,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:21,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,487 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:21,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:21,927 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:21,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083368870] [2021-05-06 12:04:21,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2083368870] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:21,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:21,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:21,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335527839] [2021-05-06 12:04:21,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:21,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:21,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:21,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:21,928 INFO L87 Difference]: Start difference. First operand 283 states and 341 transitions. Second operand has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:22,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:22,350 INFO L93 Difference]: Finished difference Result 540 states and 646 transitions. [2021-05-06 12:04:22,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:04:22,350 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:22,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:22,351 INFO L225 Difference]: With dead ends: 540 [2021-05-06 12:04:22,351 INFO L226 Difference]: Without dead ends: 324 [2021-05-06 12:04:22,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 12 SyntacticMatches, 9 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 482.2ms TimeCoverageRelationStatistics Valid=145, Invalid=667, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:22,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-05-06 12:04:22,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 283. [2021-05-06 12:04:22,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.208955223880597) internal successors, (324), 271 states have internal predecessors, (324), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:22,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 341 transitions. [2021-05-06 12:04:22,403 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 341 transitions. Word has length 49 [2021-05-06 12:04:22,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:22,403 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 341 transitions. [2021-05-06 12:04:22,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:22,403 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 341 transitions. [2021-05-06 12:04:22,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:22,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:22,404 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:22,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable185 [2021-05-06 12:04:22,404 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:22,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:22,404 INFO L82 PathProgramCache]: Analyzing trace with hash -1753798755, now seen corresponding path program 36 times [2021-05-06 12:04:22,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:22,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331329318] [2021-05-06 12:04:22,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:22,409 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:22,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:22,423 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:22,436 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:22,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,447 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:04:22,449 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:22,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:22,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:22,478 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:22,489 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,492 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:22,500 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:22,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:22,521 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:22,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,531 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:22,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:22,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:22,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:22,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:22,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:22,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:22,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:23,066 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:23,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331329318] [2021-05-06 12:04:23,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [331329318] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:23,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:23,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:23,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544735369] [2021-05-06 12:04:23,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:23,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:23,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:23,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=581, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:23,067 INFO L87 Difference]: Start difference. First operand 283 states and 341 transitions. Second operand has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:23,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:23,478 INFO L93 Difference]: Finished difference Result 547 states and 667 transitions. [2021-05-06 12:04:23,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:04:23,478 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:23,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:23,479 INFO L225 Difference]: With dead ends: 547 [2021-05-06 12:04:23,479 INFO L226 Difference]: Without dead ends: 320 [2021-05-06 12:04:23,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 12 SyntacticMatches, 8 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 541.8ms TimeCoverageRelationStatistics Valid=156, Invalid=714, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:23,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-06 12:04:23,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 295. [2021-05-06 12:04:23,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 280 states have (on average 1.2142857142857142) internal successors, (340), 283 states have internal predecessors, (340), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:23,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 357 transitions. [2021-05-06 12:04:23,528 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 357 transitions. Word has length 49 [2021-05-06 12:04:23,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:23,528 INFO L480 AbstractCegarLoop]: Abstraction has 295 states and 357 transitions. [2021-05-06 12:04:23,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:23,528 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 357 transitions. [2021-05-06 12:04:23,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 12:04:23,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:23,529 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:23,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable189 [2021-05-06 12:04:23,529 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:23,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:23,529 INFO L82 PathProgramCache]: Analyzing trace with hash -601579469, now seen corresponding path program 3 times [2021-05-06 12:04:23,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:23,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707133100] [2021-05-06 12:04:23,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:23,540 WARN L240 tifierPushTermWalker]: treesize reduction 123, result has 14.0 percent of original size [2021-05-06 12:04:23,548 WARN L245 tifierPushTermWalker]: treesize reduction 123, result has 14.0 percent of original size 20 [2021-05-06 12:04:23,553 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,559 WARN L240 tifierPushTermWalker]: treesize reduction 56, result has 57.9 percent of original size [2021-05-06 12:04:23,595 WARN L245 tifierPushTermWalker]: treesize reduction 56, result has 57.9 percent of original size 77 [2021-05-06 12:04:23,622 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,623 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:23,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:23,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:23,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:23,751 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:23,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707133100] [2021-05-06 12:04:23,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1707133100] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:23,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:23,752 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:04:23,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465300818] [2021-05-06 12:04:23,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:04:23,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:23,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:04:23,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-05-06 12:04:23,752 INFO L87 Difference]: Start difference. First operand 295 states and 357 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:23,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:23,936 INFO L93 Difference]: Finished difference Result 549 states and 663 transitions. [2021-05-06 12:04:23,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 12:04:23,937 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 51 [2021-05-06 12:04:23,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:23,937 INFO L225 Difference]: With dead ends: 549 [2021-05-06 12:04:23,938 INFO L226 Difference]: Without dead ends: 315 [2021-05-06 12:04:23,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 133.7ms TimeCoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:04:23,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-05-06 12:04:23,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 307. [2021-05-06 12:04:23,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 292 states have (on average 1.2054794520547945) internal successors, (352), 295 states have internal predecessors, (352), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:23,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 369 transitions. [2021-05-06 12:04:23,987 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 369 transitions. Word has length 51 [2021-05-06 12:04:23,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:23,987 INFO L480 AbstractCegarLoop]: Abstraction has 307 states and 369 transitions. [2021-05-06 12:04:23,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:23,988 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 369 transitions. [2021-05-06 12:04:23,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:23,988 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:23,988 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:23,988 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable190 [2021-05-06 12:04:23,988 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:23,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:23,988 INFO L82 PathProgramCache]: Analyzing trace with hash 679090812, now seen corresponding path program 37 times [2021-05-06 12:04:23,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:23,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635786609] [2021-05-06 12:04:23,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:23,994 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:24,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,006 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:24,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:24,023 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:24,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,036 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:24,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:24,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:24,064 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:24,074 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,074 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:24,077 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:24,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:24,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:24,104 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:24,116 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,118 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:24,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,128 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,137 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:24,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:24,147 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:24,156 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,157 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:24,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:24,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:24,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:24,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:24,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:24,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:24,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:24,633 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:24,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635786609] [2021-05-06 12:04:24,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1635786609] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:24,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:24,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:24,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987366644] [2021-05-06 12:04:24,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:24,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:24,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:24,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:24,634 INFO L87 Difference]: Start difference. First operand 307 states and 369 transitions. Second operand has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:25,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:25,139 INFO L93 Difference]: Finished difference Result 625 states and 742 transitions. [2021-05-06 12:04:25,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:25,139 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:25,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:25,141 INFO L225 Difference]: With dead ends: 625 [2021-05-06 12:04:25,141 INFO L226 Difference]: Without dead ends: 391 [2021-05-06 12:04:25,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 13 SyntacticMatches, 16 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 476.0ms TimeCoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:25,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-05-06 12:04:25,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 316. [2021-05-06 12:04:25,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:25,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:25,198 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:25,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:25,198 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:25,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:25,198 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:25,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:25,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:25,199 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:25,199 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable195 [2021-05-06 12:04:25,199 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:25,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:25,199 INFO L82 PathProgramCache]: Analyzing trace with hash -164914690, now seen corresponding path program 38 times [2021-05-06 12:04:25,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:25,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111404388] [2021-05-06 12:04:25,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:25,205 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:25,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:25,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:25,234 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:25,245 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,247 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:25,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:25,269 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:25,276 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:25,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,286 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:25,288 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:25,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:25,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:25,314 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:25,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,328 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:25,329 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:25,342 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:25,356 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:25,365 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,366 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:25,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:25,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:25,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:25,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:25,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:25,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:25,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:25,890 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:25,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111404388] [2021-05-06 12:04:25,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [111404388] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:25,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:25,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:25,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870340994] [2021-05-06 12:04:25,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:25,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:25,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:25,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:25,891 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:26,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:26,321 INFO L93 Difference]: Finished difference Result 634 states and 747 transitions. [2021-05-06 12:04:26,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:26,322 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:26,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:26,323 INFO L225 Difference]: With dead ends: 634 [2021-05-06 12:04:26,323 INFO L226 Difference]: Without dead ends: 391 [2021-05-06 12:04:26,324 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 12 SyntacticMatches, 16 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 507.7ms TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:26,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-05-06 12:04:26,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 316. [2021-05-06 12:04:26,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:26,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:26,385 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:26,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:26,385 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:26,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:26,385 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:26,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:26,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:26,385 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:26,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable200 [2021-05-06 12:04:26,386 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:26,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:26,386 INFO L82 PathProgramCache]: Analyzing trace with hash 109844924, now seen corresponding path program 39 times [2021-05-06 12:04:26,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:26,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861642807] [2021-05-06 12:04:26,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:26,391 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:26,403 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,410 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:26,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:26,420 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:26,431 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,433 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:26,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,435 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:26,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:26,461 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:26,471 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,471 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:26,474 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:26,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:26,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:26,500 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:26,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,514 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:26,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,516 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:26,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:26,542 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:26,551 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,552 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:26,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:26,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:26,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:26,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:26,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:26,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:26,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:27,078 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:27,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861642807] [2021-05-06 12:04:27,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [861642807] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:27,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:27,079 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:27,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154961930] [2021-05-06 12:04:27,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:27,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:27,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:27,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:27,080 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:27,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:27,654 INFO L93 Difference]: Finished difference Result 634 states and 751 transitions. [2021-05-06 12:04:27,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:27,655 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:27,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:27,656 INFO L225 Difference]: With dead ends: 634 [2021-05-06 12:04:27,656 INFO L226 Difference]: Without dead ends: 391 [2021-05-06 12:04:27,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 12 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 532.7ms TimeCoverageRelationStatistics Valid=109, Invalid=541, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:27,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-05-06 12:04:27,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 316. [2021-05-06 12:04:27,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:27,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:27,720 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:27,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:27,721 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:27,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:27,721 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:27,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:27,721 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:27,721 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:27,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable205 [2021-05-06 12:04:27,721 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:27,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:27,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1496048318, now seen corresponding path program 40 times [2021-05-06 12:04:27,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:27,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1787599310] [2021-05-06 12:04:27,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:27,727 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:27,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:27,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:27,755 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:27,767 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,769 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:27,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:27,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:27,797 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:27,806 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,807 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:27,809 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:27,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,811 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:27,819 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:27,836 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:27,847 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,850 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:27,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:27,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:27,878 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:27,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,888 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:27,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:27,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:27,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:27,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:27,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:27,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:27,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:28,441 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:28,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1787599310] [2021-05-06 12:04:28,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1787599310] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:28,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:28,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:28,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756597405] [2021-05-06 12:04:28,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:28,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:28,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:28,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:28,442 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:28,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:28,966 INFO L93 Difference]: Finished difference Result 625 states and 742 transitions. [2021-05-06 12:04:28,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:28,966 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:28,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:28,967 INFO L225 Difference]: With dead ends: 625 [2021-05-06 12:04:28,967 INFO L226 Difference]: Without dead ends: 382 [2021-05-06 12:04:28,968 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 13 SyntacticMatches, 13 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 562.4ms TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:28,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-05-06 12:04:29,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 316. [2021-05-06 12:04:29,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:29,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:29,041 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:29,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:29,041 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:29,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:29,041 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:29,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:29,042 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:29,042 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:29,042 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable210 [2021-05-06 12:04:29,042 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:29,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:29,042 INFO L82 PathProgramCache]: Analyzing trace with hash 1558087932, now seen corresponding path program 41 times [2021-05-06 12:04:29,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:29,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [693607341] [2021-05-06 12:04:29,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:29,066 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:29,067 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,068 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,076 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:29,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:29,095 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:29,107 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,110 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:29,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,124 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,133 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:29,137 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:29,144 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:29,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,154 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:29,157 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:29,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,158 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:29,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:29,185 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:29,196 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,214 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:29,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:29,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:29,245 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:29,255 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,256 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:29,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:29,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:29,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,341 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:29,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:29,848 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:29,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [693607341] [2021-05-06 12:04:29,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [693607341] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:29,849 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:29,849 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:29,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980645221] [2021-05-06 12:04:29,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:29,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:29,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:29,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:29,849 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:30,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:30,357 INFO L93 Difference]: Finished difference Result 616 states and 733 transitions. [2021-05-06 12:04:30,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:30,357 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:30,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:30,358 INFO L225 Difference]: With dead ends: 616 [2021-05-06 12:04:30,358 INFO L226 Difference]: Without dead ends: 373 [2021-05-06 12:04:30,359 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 12 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 570.0ms TimeCoverageRelationStatistics Valid=129, Invalid=627, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:30,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2021-05-06 12:04:30,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 316. [2021-05-06 12:04:30,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:30,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:30,431 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:30,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:30,431 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:30,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:30,431 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:30,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:30,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:30,432 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:30,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable215 [2021-05-06 12:04:30,432 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:30,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:30,433 INFO L82 PathProgramCache]: Analyzing trace with hash -247350402, now seen corresponding path program 42 times [2021-05-06 12:04:30,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:30,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859157755] [2021-05-06 12:04:30,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:30,440 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:30,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,442 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,450 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:30,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:30,467 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:30,479 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,482 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:30,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:30,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:30,511 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:30,520 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,521 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:30,524 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:30,524 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,525 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:30,535 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:30,551 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:30,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,565 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:30,566 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:30,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:30,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:30,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:30,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:30,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:30,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:30,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:30,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:30,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:30,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:31,181 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:31,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859157755] [2021-05-06 12:04:31,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [859157755] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:31,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:31,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:31,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779008326] [2021-05-06 12:04:31,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:31,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:31,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:31,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=542, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:31,182 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:31,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:31,789 INFO L93 Difference]: Finished difference Result 615 states and 735 transitions. [2021-05-06 12:04:31,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:04:31,789 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:31,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:31,790 INFO L225 Difference]: With dead ends: 615 [2021-05-06 12:04:31,790 INFO L226 Difference]: Without dead ends: 372 [2021-05-06 12:04:31,791 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 12 SyntacticMatches, 12 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 523.5ms TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:31,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-05-06 12:04:31,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 316. [2021-05-06 12:04:31,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:31,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:31,857 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:31,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:31,857 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:31,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:31,857 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:31,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:31,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:31,858 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:31,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable220 [2021-05-06 12:04:31,858 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:31,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:31,858 INFO L82 PathProgramCache]: Analyzing trace with hash -1064998852, now seen corresponding path program 43 times [2021-05-06 12:04:31,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:31,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306548446] [2021-05-06 12:04:31,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:31,864 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:31,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,865 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:31,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:31,903 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:31,914 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:31,917 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:31,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,935 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:31,938 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:31,945 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:31,954 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:31,955 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:31,957 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:31,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:31,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:31,984 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:31,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:31,998 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:31,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:32,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:32,025 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:32,035 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:32,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:32,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:32,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:32,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:32,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:32,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:32,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:32,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:32,589 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:32,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306548446] [2021-05-06 12:04:32,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [306548446] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:32,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:32,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:32,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95280395] [2021-05-06 12:04:32,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:32,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:32,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:32,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=586, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:32,591 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:33,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:33,079 INFO L93 Difference]: Finished difference Result 598 states and 715 transitions. [2021-05-06 12:04:33,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:04:33,079 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:33,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:33,080 INFO L225 Difference]: With dead ends: 598 [2021-05-06 12:04:33,080 INFO L226 Difference]: Without dead ends: 355 [2021-05-06 12:04:33,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 12 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 560.7ms TimeCoverageRelationStatistics Valid=149, Invalid=721, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:33,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2021-05-06 12:04:33,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 316. [2021-05-06 12:04:33,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:33,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:33,168 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:33,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:33,168 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:33,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:33,168 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:33,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:33,169 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:33,169 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:33,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable225 [2021-05-06 12:04:33,169 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:33,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:33,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1641620542, now seen corresponding path program 44 times [2021-05-06 12:04:33,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:33,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797593769] [2021-05-06 12:04:33,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:33,175 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:33,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:33,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:33,201 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:33,213 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,215 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:33,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:33,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:33,242 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:33,252 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,252 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:33,255 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:33,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:33,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:33,280 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:33,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,294 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:33,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:33,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:33,321 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:33,331 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,331 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:33,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:33,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:33,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:33,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:33,890 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:33,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797593769] [2021-05-06 12:04:33,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [797593769] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:33,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:33,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:04:33,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924329362] [2021-05-06 12:04:33,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:04:33,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:33,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:04:33,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:33,891 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:34,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:34,558 INFO L93 Difference]: Finished difference Result 593 states and 710 transitions. [2021-05-06 12:04:34,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:04:34,559 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:34,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:34,559 INFO L225 Difference]: With dead ends: 593 [2021-05-06 12:04:34,560 INFO L226 Difference]: Without dead ends: 350 [2021-05-06 12:04:34,560 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 13 SyntacticMatches, 9 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 566.5ms TimeCoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:34,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-05-06 12:04:34,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 316. [2021-05-06 12:04:34,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 304 states have internal predecessors, (361), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:34,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 378 transitions. [2021-05-06 12:04:34,649 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 378 transitions. Word has length 52 [2021-05-06 12:04:34,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:34,650 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 378 transitions. [2021-05-06 12:04:34,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:34,650 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 378 transitions. [2021-05-06 12:04:34,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:34,650 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:34,650 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:34,650 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable230 [2021-05-06 12:04:34,650 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:34,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:34,650 INFO L82 PathProgramCache]: Analyzing trace with hash 630503292, now seen corresponding path program 45 times [2021-05-06 12:04:34,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:34,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184728689] [2021-05-06 12:04:34,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:34,655 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:34,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:34,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:34,683 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:34,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:34,693 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:04:34,695 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:34,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:34,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:34,722 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:34,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:34,736 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:34,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:34,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:34,763 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:34,773 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:34,774 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:34,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:34,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:34,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:34,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:34,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:34,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:34,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:35,353 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:35,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184728689] [2021-05-06 12:04:35,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [184728689] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:35,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:35,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:04:35,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061796009] [2021-05-06 12:04:35,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:04:35,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:35,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:04:35,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=680, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:35,354 INFO L87 Difference]: Start difference. First operand 316 states and 378 transitions. Second operand has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:36,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:36,117 INFO L93 Difference]: Finished difference Result 607 states and 734 transitions. [2021-05-06 12:04:36,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:04:36,117 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:36,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:36,118 INFO L225 Difference]: With dead ends: 607 [2021-05-06 12:04:36,118 INFO L226 Difference]: Without dead ends: 353 [2021-05-06 12:04:36,118 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 12 SyntacticMatches, 9 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 581.4ms TimeCoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:04:36,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-05-06 12:04:36,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 328. [2021-05-06 12:04:36,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 313 states have (on average 1.2044728434504792) internal successors, (377), 316 states have internal predecessors, (377), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:36,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 394 transitions. [2021-05-06 12:04:36,186 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 394 transitions. Word has length 52 [2021-05-06 12:04:36,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:36,186 INFO L480 AbstractCegarLoop]: Abstraction has 328 states and 394 transitions. [2021-05-06 12:04:36,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:36,186 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 394 transitions. [2021-05-06 12:04:36,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:36,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:36,187 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:36,187 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable234 [2021-05-06 12:04:36,187 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:36,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:36,187 INFO L82 PathProgramCache]: Analyzing trace with hash -2013376257, now seen corresponding path program 46 times [2021-05-06 12:04:36,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:36,187 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443795457] [2021-05-06 12:04:36,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:36,193 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:36,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:36,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:36,222 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:36,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,236 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:36,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:36,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:36,264 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:36,274 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,274 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:36,277 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:36,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:36,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:36,303 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:36,315 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,317 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:36,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:36,338 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:36,345 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:36,355 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,355 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:36,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:36,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:36,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:36,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:36,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:36,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:36,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:36,892 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:36,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443795457] [2021-05-06 12:04:36,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1443795457] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:36,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:36,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:36,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869830919] [2021-05-06 12:04:36,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:36,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:36,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:36,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:36,893 INFO L87 Difference]: Start difference. First operand 328 states and 394 transitions. Second operand has 20 states, 20 states have (on average 2.45) internal successors, (49), 19 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:37,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:37,534 INFO L93 Difference]: Finished difference Result 673 states and 797 transitions. [2021-05-06 12:04:37,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:37,535 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 19 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:37,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:37,536 INFO L225 Difference]: With dead ends: 673 [2021-05-06 12:04:37,536 INFO L226 Difference]: Without dead ends: 421 [2021-05-06 12:04:37,536 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 19 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 543.3ms TimeCoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:37,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-05-06 12:04:37,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 337. [2021-05-06 12:04:37,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:37,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:37,614 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:37,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:37,614 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:37,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 19 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:37,614 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:37,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:37,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:37,614 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:37,615 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable239 [2021-05-06 12:04:37,615 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:37,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:37,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1252231741, now seen corresponding path program 47 times [2021-05-06 12:04:37,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:37,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517709590] [2021-05-06 12:04:37,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:37,621 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:37,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:37,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:37,648 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:37,660 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,662 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:37,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:37,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:37,691 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:37,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,701 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:37,703 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:37,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,705 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:37,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:37,730 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:37,742 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,745 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:37,754 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,755 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:37,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:37,774 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:37,783 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,784 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:37,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:37,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:37,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:37,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:37,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:37,832 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:37,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:38,328 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:38,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517709590] [2021-05-06 12:04:38,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1517709590] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:38,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:38,328 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:38,328 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481512736] [2021-05-06 12:04:38,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:38,328 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:38,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:38,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:38,329 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 20 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:39,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:39,010 INFO L93 Difference]: Finished difference Result 691 states and 815 transitions. [2021-05-06 12:04:39,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:39,010 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 20 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:39,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:39,011 INFO L225 Difference]: With dead ends: 691 [2021-05-06 12:04:39,011 INFO L226 Difference]: Without dead ends: 430 [2021-05-06 12:04:39,012 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 18 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 548.3ms TimeCoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:39,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-05-06 12:04:39,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 337. [2021-05-06 12:04:39,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:39,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:39,095 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:39,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:39,095 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:39,095 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 20 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:39,095 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:39,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:39,095 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:39,095 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:39,095 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable244 [2021-05-06 12:04:39,096 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:39,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:39,096 INFO L82 PathProgramCache]: Analyzing trace with hash 408226239, now seen corresponding path program 48 times [2021-05-06 12:04:39,096 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:39,096 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487854187] [2021-05-06 12:04:39,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:39,101 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:39,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:39,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:39,130 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:39,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,144 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:39,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:39,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:39,172 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:39,182 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,183 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:39,185 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:39,196 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,204 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:39,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:39,213 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:39,225 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,227 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:39,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:39,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:39,254 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:39,264 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,265 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:39,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:39,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:39,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:39,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:39,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:39,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:39,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:39,832 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:39,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487854187] [2021-05-06 12:04:39,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1487854187] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:39,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:39,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:39,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947966069] [2021-05-06 12:04:39,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:39,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:39,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:39,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:39,833 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:40,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:40,432 INFO L93 Difference]: Finished difference Result 682 states and 806 transitions. [2021-05-06 12:04:40,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:40,432 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:40,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:40,433 INFO L225 Difference]: With dead ends: 682 [2021-05-06 12:04:40,433 INFO L226 Difference]: Without dead ends: 421 [2021-05-06 12:04:40,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 17 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 569.6ms TimeCoverageRelationStatistics Valid=112, Invalid=590, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:40,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-05-06 12:04:40,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 337. [2021-05-06 12:04:40,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:40,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:40,544 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:40,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:40,544 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:40,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:40,544 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:40,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:40,546 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:40,546 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:40,546 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable249 [2021-05-06 12:04:40,546 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:40,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:40,546 INFO L82 PathProgramCache]: Analyzing trace with hash 682985853, now seen corresponding path program 49 times [2021-05-06 12:04:40,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:40,546 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870253803] [2021-05-06 12:04:40,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:40,552 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:40,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:40,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:40,579 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:40,591 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,593 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:40,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,613 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:40,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:40,623 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:40,633 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,634 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,636 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:40,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,663 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:40,674 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,677 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:40,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,705 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:40,715 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,716 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:40,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:40,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:40,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:41,344 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:41,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870253803] [2021-05-06 12:04:41,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [870253803] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:41,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:41,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:41,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876817500] [2021-05-06 12:04:41,345 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:41,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:41,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:41,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:41,345 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:41,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:41,975 INFO L93 Difference]: Finished difference Result 673 states and 797 transitions. [2021-05-06 12:04:41,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:41,975 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:41,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:41,976 INFO L225 Difference]: With dead ends: 673 [2021-05-06 12:04:41,977 INFO L226 Difference]: Without dead ends: 412 [2021-05-06 12:04:41,977 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 16 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 592.7ms TimeCoverageRelationStatistics Valid=122, Invalid=634, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:41,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2021-05-06 12:04:42,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 337. [2021-05-06 12:04:42,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:42,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:42,063 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:42,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:42,063 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:42,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:42,063 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:42,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:42,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:42,064 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:42,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable254 [2021-05-06 12:04:42,064 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:42,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:42,064 INFO L82 PathProgramCache]: Analyzing trace with hash 2069189247, now seen corresponding path program 50 times [2021-05-06 12:04:42,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:42,064 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129161250] [2021-05-06 12:04:42,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:42,070 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:42,070 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,079 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:42,080 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:42,097 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:42,108 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,110 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:42,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:42,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:42,138 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:42,148 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,149 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:42,151 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:42,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:42,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:42,177 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:42,189 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,191 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:42,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,193 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:42,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:42,219 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:42,228 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,229 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:42,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:42,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:42,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,274 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:42,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:42,812 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:42,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129161250] [2021-05-06 12:04:42,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1129161250] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:42,813 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:42,813 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:42,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032604169] [2021-05-06 12:04:42,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:42,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:42,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:42,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:42,813 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:43,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:43,441 INFO L93 Difference]: Finished difference Result 664 states and 788 transitions. [2021-05-06 12:04:43,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:04:43,441 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:43,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:43,442 INFO L225 Difference]: With dead ends: 664 [2021-05-06 12:04:43,442 INFO L226 Difference]: Without dead ends: 403 [2021-05-06 12:04:43,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 15 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 589.3ms TimeCoverageRelationStatistics Valid=132, Invalid=680, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:43,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-05-06 12:04:43,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 337. [2021-05-06 12:04:43,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:43,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:43,530 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:43,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:43,530 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:43,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:43,531 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:43,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:43,531 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:43,531 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:43,531 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable259 [2021-05-06 12:04:43,531 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:43,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:43,531 INFO L82 PathProgramCache]: Analyzing trace with hash 2131228861, now seen corresponding path program 51 times [2021-05-06 12:04:43,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:43,532 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581795082] [2021-05-06 12:04:43,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:43,537 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:43,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:43,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:43,563 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:43,575 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,577 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:43,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:43,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:43,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:43,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:43,617 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:43,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:43,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:43,645 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:43,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,659 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:43,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:43,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:43,689 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:43,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:43,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:43,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:43,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:43,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:43,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:43,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:43,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:44,278 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:44,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581795082] [2021-05-06 12:04:44,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [581795082] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:44,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:44,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:44,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392540598] [2021-05-06 12:04:44,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:44,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:44,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:44,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:44,279 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:44,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:44,831 INFO L93 Difference]: Finished difference Result 658 states and 778 transitions. [2021-05-06 12:04:44,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:04:44,832 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:44,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:44,833 INFO L225 Difference]: With dead ends: 658 [2021-05-06 12:04:44,833 INFO L226 Difference]: Without dead ends: 397 [2021-05-06 12:04:44,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 14 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 560.6ms TimeCoverageRelationStatistics Valid=141, Invalid=729, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:44,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-05-06 12:04:44,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 337. [2021-05-06 12:04:44,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:44,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:44,922 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:44,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:44,922 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:44,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:44,922 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:44,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:44,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:44,923 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:44,923 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable264 [2021-05-06 12:04:44,923 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:44,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:44,923 INFO L82 PathProgramCache]: Analyzing trace with hash 325790527, now seen corresponding path program 52 times [2021-05-06 12:04:44,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:44,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666148313] [2021-05-06 12:04:44,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:44,929 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:44,929 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,930 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:44,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:44,955 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:44,967 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:44,969 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:44,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,987 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:44,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:44,997 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:45,007 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:45,007 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:45,010 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:45,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:45,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:45,037 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:45,049 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:45,051 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:45,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,061 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:45,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:45,078 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:45,088 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:45,089 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:45,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:45,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:45,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:45,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:45,717 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:45,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666148313] [2021-05-06 12:04:45,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1666148313] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:45,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:45,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:04:45,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125471975] [2021-05-06 12:04:45,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:04:45,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:45,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:04:45,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=637, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:45,718 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:46,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:46,366 INFO L93 Difference]: Finished difference Result 646 states and 770 transitions. [2021-05-06 12:04:46,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:04:46,366 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:46,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:46,367 INFO L225 Difference]: With dead ends: 646 [2021-05-06 12:04:46,368 INFO L226 Difference]: Without dead ends: 385 [2021-05-06 12:04:46,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 633.9ms TimeCoverageRelationStatistics Valid=152, Invalid=778, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:46,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-05-06 12:04:46,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 337. [2021-05-06 12:04:46,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:46,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:46,458 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:46,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:46,458 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:46,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:46,458 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:46,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:46,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:46,459 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:46,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable269 [2021-05-06 12:04:46,459 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:46,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:46,459 INFO L82 PathProgramCache]: Analyzing trace with hash -491857923, now seen corresponding path program 53 times [2021-05-06 12:04:46,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:46,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853101958] [2021-05-06 12:04:46,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:46,465 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:46,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,474 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:46,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:46,492 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:46,503 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,505 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:46,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:46,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:46,543 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:46,553 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,553 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:46,556 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:46,557 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:46,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:46,583 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:46,594 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,597 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:46,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:46,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:46,625 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:46,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:46,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:46,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:46,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:46,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:46,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:46,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:46,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:47,237 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:47,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853101958] [2021-05-06 12:04:47,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [853101958] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:47,237 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:47,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:04:47,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094971824] [2021-05-06 12:04:47,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:04:47,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:47,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:04:47,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:47,238 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:47,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:47,789 INFO L93 Difference]: Finished difference Result 637 states and 761 transitions. [2021-05-06 12:04:47,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:04:47,789 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:47,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:47,790 INFO L225 Difference]: With dead ends: 637 [2021-05-06 12:04:47,790 INFO L226 Difference]: Without dead ends: 376 [2021-05-06 12:04:47,791 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 13 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 605.3ms TimeCoverageRelationStatistics Valid=162, Invalid=830, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:04:47,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-05-06 12:04:47,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 337. [2021-05-06 12:04:47,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:47,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:47,901 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:47,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:47,901 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:47,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:47,902 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:47,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:47,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:47,902 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:47,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable274 [2021-05-06 12:04:47,902 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:47,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:47,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2080205825, now seen corresponding path program 54 times [2021-05-06 12:04:47,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:47,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885771680] [2021-05-06 12:04:47,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:47,908 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:47,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:47,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:47,916 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:47,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:47,934 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:47,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:47,948 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:47,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:47,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:47,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:47,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:47,976 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:47,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:47,987 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:47,989 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:47,990 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:47,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:47,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:47,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:48,016 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:48,028 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:48,030 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:48,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,040 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:48,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:48,059 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:48,069 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:48,069 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:48,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:48,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:48,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:48,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:48,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:48,125 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:48,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:48,700 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:48,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885771680] [2021-05-06 12:04:48,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [885771680] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:48,700 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:48,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:04:48,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936123699] [2021-05-06 12:04:48,700 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:04:48,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:48,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:04:48,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=786, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:48,701 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:49,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:49,212 INFO L93 Difference]: Finished difference Result 644 states and 764 transitions. [2021-05-06 12:04:49,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:04:49,213 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:49,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:49,213 INFO L225 Difference]: With dead ends: 644 [2021-05-06 12:04:49,214 INFO L226 Difference]: Without dead ends: 383 [2021-05-06 12:04:49,214 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 611.4ms TimeCoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:04:49,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-05-06 12:04:49,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 337. [2021-05-06 12:04:49,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 322 states have (on average 1.1987577639751552) internal successors, (386), 325 states have internal predecessors, (386), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:49,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 403 transitions. [2021-05-06 12:04:49,304 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 403 transitions. Word has length 55 [2021-05-06 12:04:49,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:49,304 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 403 transitions. [2021-05-06 12:04:49,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:49,304 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 403 transitions. [2021-05-06 12:04:49,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:49,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:49,304 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:49,304 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable279 [2021-05-06 12:04:49,304 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:49,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:49,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1203644221, now seen corresponding path program 55 times [2021-05-06 12:04:49,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:49,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223107385] [2021-05-06 12:04:49,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:49,309 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:49,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,311 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:49,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:49,337 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:49,346 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:49,347 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:04:49,349 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:49,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:49,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:49,377 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:49,388 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:49,391 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:49,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:49,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:49,419 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:49,428 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:49,429 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:49,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:49,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:49,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:49,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:49,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:49,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:49,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:50,068 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:50,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223107385] [2021-05-06 12:04:50,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1223107385] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:50,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:50,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:04:50,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384805861] [2021-05-06 12:04:50,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:04:50,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:50,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:04:50,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=787, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:50,069 INFO L87 Difference]: Start difference. First operand 337 states and 403 transitions. Second operand has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:50,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:50,659 INFO L93 Difference]: Finished difference Result 646 states and 780 transitions. [2021-05-06 12:04:50,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:04:50,660 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:50,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:50,661 INFO L225 Difference]: With dead ends: 646 [2021-05-06 12:04:50,661 INFO L226 Difference]: Without dead ends: 374 [2021-05-06 12:04:50,661 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 12 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 641.8ms TimeCoverageRelationStatistics Valid=182, Invalid=940, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:04:50,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-05-06 12:04:50,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 349. [2021-05-06 12:04:50,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.2035928143712575) internal successors, (402), 337 states have internal predecessors, (402), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:50,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 419 transitions. [2021-05-06 12:04:50,752 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 419 transitions. Word has length 55 [2021-05-06 12:04:50,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:50,752 INFO L480 AbstractCegarLoop]: Abstraction has 349 states and 419 transitions. [2021-05-06 12:04:50,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:50,752 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 419 transitions. [2021-05-06 12:04:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 12:04:50,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:50,753 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:50,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable283 [2021-05-06 12:04:50,753 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:50,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:50,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1847626205, now seen corresponding path program 4 times [2021-05-06 12:04:50,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:50,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057641879] [2021-05-06 12:04:50,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:50,762 WARN L240 tifierPushTermWalker]: treesize reduction 74, result has 49.7 percent of original size [2021-05-06 12:04:50,799 WARN L245 tifierPushTermWalker]: treesize reduction 74, result has 49.7 percent of original size 73 [2021-05-06 12:04:50,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:50,834 WARN L240 tifierPushTermWalker]: treesize reduction 78, result has 50.3 percent of original size [2021-05-06 12:04:50,861 WARN L245 tifierPushTermWalker]: treesize reduction 78, result has 50.3 percent of original size 79 [2021-05-06 12:04:50,866 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:50,867 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:50,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:50,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:50,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:50,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:50,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:50,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:51,018 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:51,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057641879] [2021-05-06 12:04:51,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2057641879] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:51,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:51,018 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 12:04:51,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922739293] [2021-05-06 12:04:51,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:04:51,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:51,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:04:51,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:04:51,019 INFO L87 Difference]: Start difference. First operand 349 states and 419 transitions. Second operand has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:51,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:51,377 INFO L93 Difference]: Finished difference Result 648 states and 776 transitions. [2021-05-06 12:04:51,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:04:51,377 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 57 [2021-05-06 12:04:51,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:51,378 INFO L225 Difference]: With dead ends: 648 [2021-05-06 12:04:51,378 INFO L226 Difference]: Without dead ends: 369 [2021-05-06 12:04:51,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 25 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 182.8ms TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:04:51,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-05-06 12:04:51,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 361. [2021-05-06 12:04:51,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 346 states have (on average 1.1965317919075145) internal successors, (414), 349 states have internal predecessors, (414), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:51,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 431 transitions. [2021-05-06 12:04:51,471 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 431 transitions. Word has length 57 [2021-05-06 12:04:51,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:51,471 INFO L480 AbstractCegarLoop]: Abstraction has 361 states and 431 transitions. [2021-05-06 12:04:51,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:51,471 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 431 transitions. [2021-05-06 12:04:51,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:04:51,472 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:51,472 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:51,472 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable284 [2021-05-06 12:04:51,472 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:51,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:51,473 INFO L82 PathProgramCache]: Analyzing trace with hash -490608740, now seen corresponding path program 56 times [2021-05-06 12:04:51,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:51,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425898984] [2021-05-06 12:04:51,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:51,479 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:51,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:51,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:51,506 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:51,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,521 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:51,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:51,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:51,549 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:51,559 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,560 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:51,562 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:51,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:51,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:51,588 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:51,600 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,602 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:51,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:51,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:51,629 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:51,638 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,639 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:51,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:51,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:51,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:51,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:51,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:51,697 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:51,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:52,243 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:52,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425898984] [2021-05-06 12:04:52,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [425898984] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:52,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:52,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:52,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425824529] [2021-05-06 12:04:52,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:52,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:52,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:52,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:52,244 INFO L87 Difference]: Start difference. First operand 361 states and 431 transitions. Second operand has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:52,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:52,850 INFO L93 Difference]: Finished difference Result 733 states and 860 transitions. [2021-05-06 12:04:52,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:52,850 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:04:52,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:52,851 INFO L225 Difference]: With dead ends: 733 [2021-05-06 12:04:52,851 INFO L226 Difference]: Without dead ends: 454 [2021-05-06 12:04:52,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 20 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 588.7ms TimeCoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:52,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-05-06 12:04:52,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 370. [2021-05-06 12:04:52,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:52,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:04:52,956 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:04:52,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:52,957 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:04:52,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:52,957 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:04:52,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:04:52,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:52,957 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:52,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable289 [2021-05-06 12:04:52,957 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:52,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:52,958 INFO L82 PathProgramCache]: Analyzing trace with hash -66962018, now seen corresponding path program 57 times [2021-05-06 12:04:52,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:52,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22202013] [2021-05-06 12:04:52,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:52,963 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:52,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:52,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:52,990 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:53,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:53,004 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:53,012 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:53,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:53,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:53,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:53,032 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:53,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:53,042 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:53,044 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:53,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:53,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:53,063 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:53,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:53,072 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:53,083 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:53,086 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:53,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:53,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:53,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:53,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:53,114 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:53,124 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:53,125 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:53,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:53,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:53,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:53,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:53,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:53,169 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:53,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:53,730 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:53,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22202013] [2021-05-06 12:04:53,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [22202013] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:53,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:53,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:53,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448706604] [2021-05-06 12:04:53,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:53,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:53,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:53,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:53,731 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 22 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 21 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:54,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:54,449 INFO L93 Difference]: Finished difference Result 760 states and 891 transitions. [2021-05-06 12:04:54,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:54,450 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 21 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:04:54,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:54,451 INFO L225 Difference]: With dead ends: 760 [2021-05-06 12:04:54,451 INFO L226 Difference]: Without dead ends: 472 [2021-05-06 12:04:54,452 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 613.8ms TimeCoverageRelationStatistics Valid=105, Invalid=597, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:54,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-05-06 12:04:54,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 370. [2021-05-06 12:04:54,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:54,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:04:54,577 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:04:54,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:54,577 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:04:54,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 21 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:54,577 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:04:54,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:04:54,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:54,578 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:54,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable294 [2021-05-06 12:04:54,578 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:54,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:54,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1096321316, now seen corresponding path program 58 times [2021-05-06 12:04:54,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:54,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262298976] [2021-05-06 12:04:54,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:54,584 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:54,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,596 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:54,604 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:54,612 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:54,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,625 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:54,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:54,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:54,653 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:54,663 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,664 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:54,666 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:54,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,678 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,685 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:54,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:54,694 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:54,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,708 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:54,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:54,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:54,736 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:54,745 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,746 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:54,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:54,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:54,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:54,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:54,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:54,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:54,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:55,299 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:55,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262298976] [2021-05-06 12:04:55,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1262298976] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:55,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:55,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:55,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55701620] [2021-05-06 12:04:55,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:55,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:55,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:55,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:55,300 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 23 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:56,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:56,132 INFO L93 Difference]: Finished difference Result 751 states and 882 transitions. [2021-05-06 12:04:56,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:56,132 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:04:56,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:56,133 INFO L225 Difference]: With dead ends: 751 [2021-05-06 12:04:56,134 INFO L226 Difference]: Without dead ends: 463 [2021-05-06 12:04:56,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 19 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 522.4ms TimeCoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:56,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2021-05-06 12:04:56,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 370. [2021-05-06 12:04:56,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:56,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:04:56,264 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:04:56,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:56,265 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:04:56,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:56,265 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:04:56,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:04:56,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:56,265 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:56,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable299 [2021-05-06 12:04:56,265 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:56,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:56,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1940326818, now seen corresponding path program 59 times [2021-05-06 12:04:56,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:56,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088236855] [2021-05-06 12:04:56,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:56,275 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:56,286 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,296 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:56,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:56,308 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:56,322 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:56,325 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:56,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:56,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:56,358 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:56,369 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:56,370 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:56,373 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:56,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,386 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:56,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:56,403 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:56,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:56,419 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:56,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:56,438 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:56,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:56,449 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:56,461 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:56,462 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:56,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:56,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:56,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:56,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:56,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:56,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:56,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:57,080 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:57,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088236855] [2021-05-06 12:04:57,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1088236855] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:57,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:57,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:57,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011327820] [2021-05-06 12:04:57,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:57,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:57,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:57,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:57,081 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:57,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:57,723 INFO L93 Difference]: Finished difference Result 742 states and 873 transitions. [2021-05-06 12:04:57,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:04:57,723 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:04:57,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:57,725 INFO L225 Difference]: With dead ends: 742 [2021-05-06 12:04:57,725 INFO L226 Difference]: Without dead ends: 454 [2021-05-06 12:04:57,725 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 621.8ms TimeCoverageRelationStatistics Valid=125, Invalid=687, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:57,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-05-06 12:04:57,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 370. [2021-05-06 12:04:57,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:57,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:04:57,861 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:04:57,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:57,862 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:04:57,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:57,862 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:04:57,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:04:57,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:57,862 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:57,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable304 [2021-05-06 12:04:57,862 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:57,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:57,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1665567204, now seen corresponding path program 60 times [2021-05-06 12:04:57,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:57,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1798174575] [2021-05-06 12:04:57,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:57,878 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:57,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:57,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:57,908 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:57,922 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:57,924 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:57,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,936 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:57,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:57,955 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:57,966 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:57,967 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:57,969 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:57,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:57,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:58,000 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:58,013 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,015 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:58,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,017 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:58,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:58,044 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:58,055 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,056 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:58,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:58,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:58,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:58,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:58,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:58,121 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:58,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:58,709 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:58,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1798174575] [2021-05-06 12:04:58,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1798174575] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:58,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:58,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:58,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866995249] [2021-05-06 12:04:58,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:58,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:58,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:58,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:58,710 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:59,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:59,627 INFO L93 Difference]: Finished difference Result 733 states and 864 transitions. [2021-05-06 12:04:59,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:04:59,627 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:04:59,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:59,629 INFO L225 Difference]: With dead ends: 733 [2021-05-06 12:04:59,629 INFO L226 Difference]: Without dead ends: 445 [2021-05-06 12:04:59,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 636.6ms TimeCoverageRelationStatistics Valid=135, Invalid=735, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:59,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2021-05-06 12:04:59,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 370. [2021-05-06 12:04:59,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:59,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:04:59,750 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:04:59,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:59,750 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:04:59,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:59,751 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:04:59,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:04:59,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:59,751 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:59,751 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable309 [2021-05-06 12:04:59,751 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:59,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:59,751 INFO L82 PathProgramCache]: Analyzing trace with hash -279363810, now seen corresponding path program 61 times [2021-05-06 12:04:59,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:59,752 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782605102] [2021-05-06 12:04:59,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:59,757 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:59,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:59,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:59,786 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:59,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:59,800 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:59,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:59,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:59,828 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:59,837 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:59,838 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:59,841 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:59,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:59,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:59,869 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:59,881 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:59,883 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:59,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:59,901 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:59,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:59,911 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:59,921 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:59,922 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:59,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:59,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:59,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:59,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:59,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:59,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:59,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:00,552 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:00,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782605102] [2021-05-06 12:05:00,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [782605102] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:00,553 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:00,553 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:05:00,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663010863] [2021-05-06 12:05:00,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:05:00,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:00,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:05:00,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:05:00,553 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:01,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:01,205 INFO L93 Difference]: Finished difference Result 724 states and 855 transitions. [2021-05-06 12:05:01,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:05:01,205 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:01,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:01,206 INFO L225 Difference]: With dead ends: 724 [2021-05-06 12:05:01,206 INFO L226 Difference]: Without dead ends: 436 [2021-05-06 12:05:01,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 16 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 633.9ms TimeCoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:01,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2021-05-06 12:05:01,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 370. [2021-05-06 12:05:01,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:01,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:05:01,344 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:05:01,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:01,345 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:05:01,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:01,345 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:05:01,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:01,345 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:01,345 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:01,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable314 [2021-05-06 12:05:01,345 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:01,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:01,346 INFO L82 PathProgramCache]: Analyzing trace with hash -217324196, now seen corresponding path program 62 times [2021-05-06 12:05:01,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:01,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349535836] [2021-05-06 12:05:01,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:01,378 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:01,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:01,390 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:01,407 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:01,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:01,421 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:01,430 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:01,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:01,451 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:01,461 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:01,462 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:01,465 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:01,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:01,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:01,496 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:01,509 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:01,513 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:01,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,523 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:01,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:01,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:01,544 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:01,554 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:01,555 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:01,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:01,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:01,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:01,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:01,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:01,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:01,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:02,212 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:02,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349535836] [2021-05-06 12:05:02,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1349535836] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:02,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:02,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:05:02,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416199722] [2021-05-06 12:05:02,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:05:02,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:02,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:05:02,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=740, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:02,214 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:02,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:02,828 INFO L93 Difference]: Finished difference Result 721 states and 848 transitions. [2021-05-06 12:05:02,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:05:02,829 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:02,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:02,830 INFO L225 Difference]: With dead ends: 721 [2021-05-06 12:05:02,830 INFO L226 Difference]: Without dead ends: 433 [2021-05-06 12:05:02,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 15 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 624.8ms TimeCoverageRelationStatistics Valid=134, Invalid=796, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:02,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-05-06 12:05:02,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 370. [2021-05-06 12:05:02,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:02,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:05:02,957 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:05:02,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:02,957 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:05:02,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:02,957 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:05:02,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:02,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:02,957 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:02,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable319 [2021-05-06 12:05:02,957 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:02,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:02,958 INFO L82 PathProgramCache]: Analyzing trace with hash -2022762530, now seen corresponding path program 63 times [2021-05-06 12:05:02,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:02,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406327660] [2021-05-06 12:05:02,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:02,963 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:02,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:02,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:02,991 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:03,003 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,005 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:03,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,024 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:03,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:03,034 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:03,044 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,044 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:03,047 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:03,058 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,065 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:03,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:03,074 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:03,086 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,089 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:03,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:03,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:03,116 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:03,126 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,126 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:03,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:03,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:03,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:03,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:03,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:03,170 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:03,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:03,840 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:03,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406327660] [2021-05-06 12:05:03,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1406327660] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:03,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:03,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:05:03,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845884102] [2021-05-06 12:05:03,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:05:03,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:03,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:05:03,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=740, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:03,841 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:04,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:04,470 INFO L93 Difference]: Finished difference Result 706 states and 837 transitions. [2021-05-06 12:05:04,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:05:04,471 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:04,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:04,472 INFO L225 Difference]: With dead ends: 706 [2021-05-06 12:05:04,472 INFO L226 Difference]: Without dead ends: 418 [2021-05-06 12:05:04,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 14 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 716.3ms TimeCoverageRelationStatistics Valid=165, Invalid=891, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:04,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2021-05-06 12:05:04,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 370. [2021-05-06 12:05:04,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:04,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:05:04,613 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:05:04,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:04,613 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:05:04,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:04,613 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:05:04,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:04,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:04,613 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:04,614 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable324 [2021-05-06 12:05:04,614 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:04,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:04,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1454556316, now seen corresponding path program 64 times [2021-05-06 12:05:04,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:04,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227419730] [2021-05-06 12:05:04,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:04,620 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:04,631 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:04,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:04,648 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:04,660 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:04,662 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:04,662 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:04,675 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:04,689 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:04,698 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:04,699 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:04,701 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:04,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:04,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:04,728 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:04,740 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:04,742 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:04,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,743 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:04,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:04,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:04,769 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:04,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:04,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:04,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:04,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:04,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:04,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:04,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:04,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:04,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:05,470 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:05,471 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227419730] [2021-05-06 12:05:05,471 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1227419730] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:05,471 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:05,471 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:05:05,471 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339574393] [2021-05-06 12:05:05,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:05:05,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:05,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:05:05,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=792, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:05,472 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:06,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:06,099 INFO L93 Difference]: Finished difference Result 697 states and 828 transitions. [2021-05-06 12:05:06,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:05:06,099 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:06,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:06,100 INFO L225 Difference]: With dead ends: 697 [2021-05-06 12:05:06,100 INFO L226 Difference]: Without dead ends: 409 [2021-05-06 12:05:06,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 13 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 695.1ms TimeCoverageRelationStatistics Valid=175, Invalid=947, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:06,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-05-06 12:05:06,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 370. [2021-05-06 12:05:06,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:06,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:05:06,225 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:05:06,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:06,225 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:05:06,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:06,225 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:05:06,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:06,225 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:06,225 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:06,225 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable329 [2021-05-06 12:05:06,225 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:06,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:06,226 INFO L82 PathProgramCache]: Analyzing trace with hash -133791586, now seen corresponding path program 65 times [2021-05-06 12:05:06,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:06,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419140298] [2021-05-06 12:05:06,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:06,231 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:06,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,240 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:06,242 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:06,258 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:06,270 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:06,272 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:06,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,273 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,282 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:06,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:06,298 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:06,308 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:06,309 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:06,311 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:06,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,329 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:06,331 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:06,338 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:06,350 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:06,352 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:06,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,354 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:06,363 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:06,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:06,380 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:06,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:06,390 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:06,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:06,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:06,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:06,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:06,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:06,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:07,109 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:07,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419140298] [2021-05-06 12:05:07,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [419140298] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:07,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:07,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:05:07,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133527321] [2021-05-06 12:05:07,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:05:07,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:07,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:05:07,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=846, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:07,110 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:07,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:07,802 INFO L93 Difference]: Finished difference Result 692 states and 823 transitions. [2021-05-06 12:05:07,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:05:07,802 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:07,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:07,803 INFO L225 Difference]: With dead ends: 692 [2021-05-06 12:05:07,804 INFO L226 Difference]: Without dead ends: 404 [2021-05-06 12:05:07,804 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 721.1ms TimeCoverageRelationStatistics Valid=185, Invalid=1005, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:07,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-05-06 12:05:07,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 370. [2021-05-06 12:05:07,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 355 states have (on average 1.1915492957746479) internal successors, (423), 358 states have internal predecessors, (423), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:07,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 440 transitions. [2021-05-06 12:05:07,929 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 440 transitions. Word has length 58 [2021-05-06 12:05:07,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:07,929 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 440 transitions. [2021-05-06 12:05:07,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:07,929 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 440 transitions. [2021-05-06 12:05:07,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:07,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:07,930 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:07,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable334 [2021-05-06 12:05:07,930 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:07,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:07,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1144908836, now seen corresponding path program 66 times [2021-05-06 12:05:07,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:07,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782475348] [2021-05-06 12:05:07,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:07,953 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:07,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,955 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:07,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:07,982 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:07,992 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:07,993 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:05:07,995 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:08,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:08,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:08,024 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:08,036 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,039 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:08,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,040 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:08,053 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:08,067 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:08,077 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,078 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:08,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:08,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:08,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:08,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:08,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:08,123 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:08,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:08,830 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:08,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782475348] [2021-05-06 12:05:08,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1782475348] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:08,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:08,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:05:08,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493878016] [2021-05-06 12:05:08,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:05:08,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:08,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:05:08,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:08,832 INFO L87 Difference]: Start difference. First operand 370 states and 440 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:09,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:09,558 INFO L93 Difference]: Finished difference Result 706 states and 847 transitions. [2021-05-06 12:05:09,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:05:09,559 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:09,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:09,560 INFO L225 Difference]: With dead ends: 706 [2021-05-06 12:05:09,560 INFO L226 Difference]: Without dead ends: 407 [2021-05-06 12:05:09,560 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 11 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 752.5ms TimeCoverageRelationStatistics Valid=195, Invalid=1065, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:09,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2021-05-06 12:05:09,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 382. [2021-05-06 12:05:09,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1961852861035422) internal successors, (439), 370 states have internal predecessors, (439), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:09,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 456 transitions. [2021-05-06 12:05:09,685 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 456 transitions. Word has length 58 [2021-05-06 12:05:09,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:09,685 INFO L480 AbstractCegarLoop]: Abstraction has 382 states and 456 transitions. [2021-05-06 12:05:09,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:09,685 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 456 transitions. [2021-05-06 12:05:09,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:09,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:09,686 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:09,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable338 [2021-05-06 12:05:09,686 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:09,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:09,686 INFO L82 PathProgramCache]: Analyzing trace with hash 831909855, now seen corresponding path program 67 times [2021-05-06 12:05:09,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:09,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [410982218] [2021-05-06 12:05:09,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:09,692 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:09,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:09,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:09,720 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:09,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,734 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:09,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,743 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:09,756 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:09,762 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:09,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,772 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:09,775 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:09,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,787 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:09,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:09,803 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:09,815 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,817 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:09,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:09,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:09,845 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:09,854 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,855 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:09,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:09,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:09,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:09,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:10,489 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:10,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [410982218] [2021-05-06 12:05:10,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [410982218] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:10,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:10,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:05:10,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325800038] [2021-05-06 12:05:10,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:05:10,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:10,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:05:10,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:05:10,490 INFO L87 Difference]: Start difference. First operand 382 states and 456 transitions. Second operand has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:11,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:11,322 INFO L93 Difference]: Finished difference Result 790 states and 928 transitions. [2021-05-06 12:05:11,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:05:11,322 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:11,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:11,323 INFO L225 Difference]: With dead ends: 790 [2021-05-06 12:05:11,324 INFO L226 Difference]: Without dead ends: 493 [2021-05-06 12:05:11,324 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 13 SyntacticMatches, 22 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 642.6ms TimeCoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:05:11,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-05-06 12:05:11,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 391. [2021-05-06 12:05:11,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:11,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:11,478 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:11,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:11,478 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:11,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:11,478 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:11,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:11,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:11,478 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:11,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable343 [2021-05-06 12:05:11,479 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:11,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:11,479 INFO L82 PathProgramCache]: Analyzing trace with hash -1217477987, now seen corresponding path program 68 times [2021-05-06 12:05:11,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:11,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670523716] [2021-05-06 12:05:11,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:11,484 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:11,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:11,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:11,512 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:11,524 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:11,526 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:11,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:11,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:11,554 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:11,564 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:11,564 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:11,567 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:11,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:11,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:11,593 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:11,605 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:11,607 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:11,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:11,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:11,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:11,635 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:11,644 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:11,645 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:11,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:11,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:11,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:11,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:11,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:11,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:11,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:12,285 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:12,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670523716] [2021-05-06 12:05:12,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1670523716] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:12,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:12,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:05:12,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098614074] [2021-05-06 12:05:12,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:05:12,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:12,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:05:12,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:05:12,286 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:13,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:13,143 INFO L93 Difference]: Finished difference Result 808 states and 946 transitions. [2021-05-06 12:05:13,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:05:13,143 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:13,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:13,145 INFO L225 Difference]: With dead ends: 808 [2021-05-06 12:05:13,145 INFO L226 Difference]: Without dead ends: 502 [2021-05-06 12:05:13,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 651.8ms TimeCoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:05:13,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-05-06 12:05:13,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 391. [2021-05-06 12:05:13,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:13,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:13,297 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:13,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:13,297 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:13,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:13,297 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:13,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:13,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:13,297 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:13,297 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable348 [2021-05-06 12:05:13,297 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:13,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:13,298 INFO L82 PathProgramCache]: Analyzing trace with hash -793831265, now seen corresponding path program 69 times [2021-05-06 12:05:13,298 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:13,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1503109312] [2021-05-06 12:05:13,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:13,303 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:13,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:13,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:13,332 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:13,343 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:13,345 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:13,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:13,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:13,372 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:13,381 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:13,382 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:13,384 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:13,396 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:13,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:13,422 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:13,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:13,437 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:13,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:13,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:13,451 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:13,465 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:13,475 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:13,475 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:13,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:13,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:13,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:13,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:13,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:13,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:13,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:14,134 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:14,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1503109312] [2021-05-06 12:05:14,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1503109312] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:14,135 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:14,135 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:05:14,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753650688] [2021-05-06 12:05:14,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:05:14,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:14,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:05:14,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:05:14,135 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:14,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:14,866 INFO L93 Difference]: Finished difference Result 799 states and 937 transitions. [2021-05-06 12:05:14,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:05:14,866 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:14,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:14,867 INFO L225 Difference]: With dead ends: 799 [2021-05-06 12:05:14,867 INFO L226 Difference]: Without dead ends: 493 [2021-05-06 12:05:14,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 651.6ms TimeCoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:05:14,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-05-06 12:05:15,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 391. [2021-05-06 12:05:15,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:15,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:15,025 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:15,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:15,025 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:15,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:15,025 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:15,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:15,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:15,025 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:15,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable353 [2021-05-06 12:05:15,025 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:15,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:15,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1823190563, now seen corresponding path program 70 times [2021-05-06 12:05:15,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:15,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1759678392] [2021-05-06 12:05:15,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:15,031 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:15,040 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:15,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:15,054 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:15,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:15,065 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:15,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,074 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:15,076 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:15,087 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:15,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:15,095 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:15,104 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:15,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,106 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:15,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:15,126 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:15,134 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:15,136 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:15,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:15,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:15,163 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:15,179 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:15,191 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:15,191 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:15,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:15,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:15,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:15,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:15,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:15,251 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:15,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:15,851 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:15,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1759678392] [2021-05-06 12:05:15,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1759678392] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:15,851 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:15,851 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:05:15,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969939335] [2021-05-06 12:05:15,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:05:15,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:15,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:05:15,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:05:15,852 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:16,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:16,583 INFO L93 Difference]: Finished difference Result 787 states and 921 transitions. [2021-05-06 12:05:16,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:05:16,583 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:16,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:16,584 INFO L225 Difference]: With dead ends: 787 [2021-05-06 12:05:16,584 INFO L226 Difference]: Without dead ends: 481 [2021-05-06 12:05:16,585 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 641.0ms TimeCoverageRelationStatistics Valid=127, Invalid=743, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:16,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2021-05-06 12:05:16,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 391. [2021-05-06 12:05:16,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:16,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:16,745 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:16,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:16,745 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:16,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:16,745 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:16,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:16,745 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:16,745 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:16,745 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable358 [2021-05-06 12:05:16,745 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:16,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:16,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1627771231, now seen corresponding path program 71 times [2021-05-06 12:05:16,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:16,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055837259] [2021-05-06 12:05:16,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:16,752 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:16,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,755 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:16,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:16,781 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:16,793 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,795 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:16,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:16,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:16,823 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:16,833 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,834 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:16,836 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:16,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:16,846 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:16,862 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:16,874 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,876 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:16,885 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,886 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,894 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:16,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:16,904 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:16,914 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,915 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:16,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:17,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:17,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:17,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:17,586 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:17,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055837259] [2021-05-06 12:05:17,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2055837259] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:17,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:17,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:05:17,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340300522] [2021-05-06 12:05:17,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:05:17,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:17,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:05:17,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:05:17,587 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:18,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:18,402 INFO L93 Difference]: Finished difference Result 781 states and 915 transitions. [2021-05-06 12:05:18,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:05:18,403 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:18,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:18,404 INFO L225 Difference]: With dead ends: 781 [2021-05-06 12:05:18,404 INFO L226 Difference]: Without dead ends: 475 [2021-05-06 12:05:18,404 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 13 SyntacticMatches, 19 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 618.0ms TimeCoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:18,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-05-06 12:05:18,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 391. [2021-05-06 12:05:18,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:18,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:18,582 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:18,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:18,582 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:18,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:18,582 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:18,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:18,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:18,583 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:18,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable363 [2021-05-06 12:05:18,583 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:18,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:18,583 INFO L82 PathProgramCache]: Analyzing trace with hash 1902530845, now seen corresponding path program 72 times [2021-05-06 12:05:18,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:18,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101823879] [2021-05-06 12:05:18,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:18,589 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:18,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:18,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:18,616 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:18,628 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:18,630 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:18,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,631 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:18,643 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:18,657 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:18,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:18,668 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:18,670 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:18,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:18,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:18,697 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:18,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:18,713 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:18,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:18,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:18,740 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:18,749 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:18,750 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:18,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:18,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:18,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:18,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:18,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:18,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:19,424 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:19,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101823879] [2021-05-06 12:05:19,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [101823879] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:19,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:19,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:05:19,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058945820] [2021-05-06 12:05:19,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:05:19,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:19,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:05:19,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:19,425 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:20,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:20,119 INFO L93 Difference]: Finished difference Result 775 states and 909 transitions. [2021-05-06 12:05:20,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:05:20,119 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:20,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:20,120 INFO L225 Difference]: With dead ends: 775 [2021-05-06 12:05:20,120 INFO L226 Difference]: Without dead ends: 469 [2021-05-06 12:05:20,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 671.0ms TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:20,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-05-06 12:05:20,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 391. [2021-05-06 12:05:20,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:20,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:20,284 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:20,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:20,284 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:20,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:20,285 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:20,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:20,285 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:20,285 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:20,285 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable368 [2021-05-06 12:05:20,285 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:20,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:20,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1006233057, now seen corresponding path program 73 times [2021-05-06 12:05:20,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:20,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1168011312] [2021-05-06 12:05:20,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:20,291 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:20,302 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,303 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:20,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:20,319 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:20,331 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:20,333 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:20,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:20,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:20,360 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:20,370 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:20,371 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:20,373 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:20,374 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,374 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:20,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:20,398 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:20,433 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:20,436 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:20,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:20,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:20,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:20,473 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:20,482 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:20,483 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:20,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:20,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:20,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:20,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:20,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:20,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:20,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:21,094 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:21,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1168011312] [2021-05-06 12:05:21,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1168011312] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:21,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:21,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:05:21,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751601995] [2021-05-06 12:05:21,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:05:21,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:21,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:05:21,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:21,096 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:21,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:21,898 INFO L93 Difference]: Finished difference Result 763 states and 901 transitions. [2021-05-06 12:05:21,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:05:21,899 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:21,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:21,900 INFO L225 Difference]: With dead ends: 763 [2021-05-06 12:05:21,900 INFO L226 Difference]: Without dead ends: 457 [2021-05-06 12:05:21,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 13 SyntacticMatches, 16 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 593.7ms TimeCoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:21,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-05-06 12:05:22,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 391. [2021-05-06 12:05:22,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:22,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:22,100 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:22,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:22,100 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:22,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:22,100 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:22,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:22,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:22,101 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:22,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable373 [2021-05-06 12:05:22,101 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:22,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:22,101 INFO L82 PathProgramCache]: Analyzing trace with hash -944193443, now seen corresponding path program 74 times [2021-05-06 12:05:22,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:22,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80732086] [2021-05-06 12:05:22,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:22,107 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:22,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:22,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:22,134 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:22,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:22,149 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:22,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:22,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:22,176 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:22,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:22,186 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:22,188 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:22,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:22,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:22,214 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:22,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:22,228 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:22,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:22,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:22,257 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:22,267 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:22,267 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:22,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:22,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:22,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:22,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:22,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:22,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:22,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:23,085 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:23,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80732086] [2021-05-06 12:05:23,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [80732086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:23,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:23,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:05:23,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787980434] [2021-05-06 12:05:23,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:05:23,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:23,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:05:23,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=850, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:23,086 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:23,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:23,812 INFO L93 Difference]: Finished difference Result 763 states and 897 transitions. [2021-05-06 12:05:23,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:05:23,812 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:23,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:23,813 INFO L225 Difference]: With dead ends: 763 [2021-05-06 12:05:23,813 INFO L226 Difference]: Without dead ends: 457 [2021-05-06 12:05:23,814 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 12 SyntacticMatches, 16 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 618 ImplicationChecksByTransitivity, 766.6ms TimeCoverageRelationStatistics Valid=167, Invalid=955, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:23,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-05-06 12:05:24,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 391. [2021-05-06 12:05:24,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:24,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:24,057 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:24,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:24,057 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:24,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:24,058 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:24,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:24,058 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:24,058 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:24,058 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable378 [2021-05-06 12:05:24,058 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:24,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:24,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1545335519, now seen corresponding path program 75 times [2021-05-06 12:05:24,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:24,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016543935] [2021-05-06 12:05:24,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:24,065 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:24,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:24,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:24,092 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:24,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:24,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,110 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:24,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:24,139 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:24,150 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,151 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:24,153 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:24,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,167 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:24,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:24,186 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:24,200 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,203 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:24,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:24,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:24,235 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:24,247 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,248 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:24,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:24,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:24,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:24,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:24,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:24,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:24,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:24,978 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:24,978 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016543935] [2021-05-06 12:05:24,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1016543935] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:24,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:24,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:05:24,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256844769] [2021-05-06 12:05:24,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:05:24,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:24,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:05:24,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=851, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:24,979 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:25,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:25,872 INFO L93 Difference]: Finished difference Result 745 states and 883 transitions. [2021-05-06 12:05:25,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:05:25,873 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:25,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:25,877 INFO L225 Difference]: With dead ends: 745 [2021-05-06 12:05:25,877 INFO L226 Difference]: Without dead ends: 439 [2021-05-06 12:05:25,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 14 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 728.2ms TimeCoverageRelationStatistics Valid=178, Invalid=1012, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:25,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2021-05-06 12:05:26,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 391. [2021-05-06 12:05:26,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:26,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:26,071 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:26,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:26,072 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:26,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:26,072 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:26,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:26,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:26,072 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:26,072 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable383 [2021-05-06 12:05:26,072 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:26,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:26,073 INFO L82 PathProgramCache]: Analyzing trace with hash 727687069, now seen corresponding path program 76 times [2021-05-06 12:05:26,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:26,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470108458] [2021-05-06 12:05:26,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:26,079 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:26,091 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,100 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:26,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:26,110 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:26,122 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,125 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:26,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:26,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:26,156 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:26,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,167 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:26,170 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:26,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:26,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:26,200 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:26,213 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,215 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:26,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:26,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:26,244 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:26,255 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,256 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:26,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:26,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:26,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:26,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:26,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:26,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:26,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:26,984 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:26,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470108458] [2021-05-06 12:05:26,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [470108458] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:26,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:26,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:05:26,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248054546] [2021-05-06 12:05:26,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:05:26,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:26,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:05:26,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=907, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:26,985 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:27,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:27,733 INFO L93 Difference]: Finished difference Result 736 states and 874 transitions. [2021-05-06 12:05:27,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:05:27,733 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:27,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:27,735 INFO L225 Difference]: With dead ends: 736 [2021-05-06 12:05:27,735 INFO L226 Difference]: Without dead ends: 430 [2021-05-06 12:05:27,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 13 SyntacticMatches, 13 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 726.1ms TimeCoverageRelationStatistics Valid=188, Invalid=1072, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:27,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-05-06 12:05:27,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 391. [2021-05-06 12:05:27,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:27,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:27,902 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:27,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:27,902 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:27,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:27,902 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:27,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:27,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:27,902 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:27,903 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable388 [2021-05-06 12:05:27,903 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:27,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:27,903 INFO L82 PathProgramCache]: Analyzing trace with hash -860660833, now seen corresponding path program 77 times [2021-05-06 12:05:27,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:27,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285014230] [2021-05-06 12:05:27,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:27,909 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:27,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:27,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:27,936 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:27,947 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:27,949 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:27,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:27,971 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:27,977 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:27,987 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:27,988 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:27,990 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:28,001 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:28,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:28,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:28,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:28,017 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:28,029 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:28,031 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:28,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:28,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:28,041 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:28,044 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:28,058 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:28,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:28,069 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:28,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:28,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:28,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:28,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:28,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:28,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:28,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:28,787 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:28,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285014230] [2021-05-06 12:05:28,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [285014230] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:28,788 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:28,788 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:05:28,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106760846] [2021-05-06 12:05:28,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:05:28,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:28,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:05:28,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1024, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:28,789 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 32 states, 32 states have (on average 1.71875) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:29,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:29,797 INFO L93 Difference]: Finished difference Result 749 states and 883 transitions. [2021-05-06 12:05:29,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:05:29,798 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:29,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:29,799 INFO L225 Difference]: With dead ends: 749 [2021-05-06 12:05:29,799 INFO L226 Difference]: Without dead ends: 443 [2021-05-06 12:05:29,799 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 13 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 685.6ms TimeCoverageRelationStatistics Valid=197, Invalid=1135, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:29,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-05-06 12:05:29,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 391. [2021-05-06 12:05:29,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1914893617021276) internal successors, (448), 379 states have internal predecessors, (448), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:29,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 465 transitions. [2021-05-06 12:05:29,979 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 465 transitions. Word has length 61 [2021-05-06 12:05:29,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:29,980 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 465 transitions. [2021-05-06 12:05:29,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:29,980 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 465 transitions. [2021-05-06 12:05:29,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:29,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:29,980 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:29,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable393 [2021-05-06 12:05:29,980 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:29,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:29,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1871778083, now seen corresponding path program 78 times [2021-05-06 12:05:29,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:29,981 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569609147] [2021-05-06 12:05:29,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:29,985 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:29,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:30,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:30,013 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:30,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:30,023 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:05:30,025 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:30,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:30,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:30,051 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:30,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:30,065 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:30,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:30,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:30,092 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:30,102 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:30,102 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:30,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:30,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:30,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:30,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:30,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:30,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:30,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:30,893 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:30,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569609147] [2021-05-06 12:05:30,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [569609147] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:30,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:30,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:05:30,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463256416] [2021-05-06 12:05:30,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:05:30,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:30,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:05:30,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1025, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:30,894 INFO L87 Difference]: Start difference. First operand 391 states and 465 transitions. Second operand has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:31,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:31,653 INFO L93 Difference]: Finished difference Result 745 states and 893 transitions. [2021-05-06 12:05:31,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:05:31,653 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:31,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:31,654 INFO L225 Difference]: With dead ends: 745 [2021-05-06 12:05:31,654 INFO L226 Difference]: Without dead ends: 428 [2021-05-06 12:05:31,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 12 SyntacticMatches, 12 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 792.9ms TimeCoverageRelationStatistics Valid=208, Invalid=1198, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:05:31,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-05-06 12:05:31,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 403. [2021-05-06 12:05:31,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1958762886597938) internal successors, (464), 391 states have internal predecessors, (464), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:31,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 481 transitions. [2021-05-06 12:05:31,823 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 481 transitions. Word has length 61 [2021-05-06 12:05:31,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:31,823 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 481 transitions. [2021-05-06 12:05:31,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:31,823 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 481 transitions. [2021-05-06 12:05:31,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 12:05:31,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:31,824 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:31,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable397 [2021-05-06 12:05:31,824 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:31,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:31,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1779769613, now seen corresponding path program 5 times [2021-05-06 12:05:31,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:31,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121990185] [2021-05-06 12:05:31,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:31,833 WARN L240 tifierPushTermWalker]: treesize reduction 70, result has 54.2 percent of original size [2021-05-06 12:05:31,875 WARN L245 tifierPushTermWalker]: treesize reduction 70, result has 54.2 percent of original size 83 [2021-05-06 12:05:31,904 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:31,910 WARN L240 tifierPushTermWalker]: treesize reduction 143, result has 12.3 percent of original size [2021-05-06 12:05:31,918 WARN L245 tifierPushTermWalker]: treesize reduction 143, result has 12.3 percent of original size 20 [2021-05-06 12:05:31,924 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:31,924 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:31,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:31,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:31,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:31,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:31,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:31,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:32,118 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:32,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121990185] [2021-05-06 12:05:32,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [121990185] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:32,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:32,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:05:32,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205525961] [2021-05-06 12:05:32,118 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:05:32,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:32,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:05:32,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:05:32,119 INFO L87 Difference]: Start difference. First operand 403 states and 481 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:05:32,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:32,522 INFO L93 Difference]: Finished difference Result 747 states and 889 transitions. [2021-05-06 12:05:32,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:05:32,522 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 63 [2021-05-06 12:05:32,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:32,523 INFO L225 Difference]: With dead ends: 747 [2021-05-06 12:05:32,523 INFO L226 Difference]: Without dead ends: 423 [2021-05-06 12:05:32,524 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 10 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 235.5ms TimeCoverageRelationStatistics Valid=155, Invalid=351, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:05:32,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2021-05-06 12:05:32,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 415. [2021-05-06 12:05:32,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 400 states have (on average 1.19) internal successors, (476), 403 states have internal predecessors, (476), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:32,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 493 transitions. [2021-05-06 12:05:32,693 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 493 transitions. Word has length 63 [2021-05-06 12:05:32,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:32,693 INFO L480 AbstractCegarLoop]: Abstraction has 415 states and 493 transitions. [2021-05-06 12:05:32,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:05:32,693 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 493 transitions. [2021-05-06 12:05:32,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:32,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:32,694 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:32,694 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable398 [2021-05-06 12:05:32,694 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:32,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:32,694 INFO L82 PathProgramCache]: Analyzing trace with hash -2046600004, now seen corresponding path program 79 times [2021-05-06 12:05:32,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:32,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952668769] [2021-05-06 12:05:32,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:32,700 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:32,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:32,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:32,727 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:32,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:32,741 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:32,741 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:32,754 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:32,768 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:32,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:32,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:32,781 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:32,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:32,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:32,809 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:32,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:32,823 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:32,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:32,836 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:32,850 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:32,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:32,860 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:32,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:32,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:32,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:32,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:32,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:32,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:32,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:33,547 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:33,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952668769] [2021-05-06 12:05:33,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1952668769] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:33,548 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:33,548 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:05:33,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928722167] [2021-05-06 12:05:33,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:05:33,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:33,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:05:33,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:05:33,548 INFO L87 Difference]: Start difference. First operand 415 states and 493 transitions. Second operand has 23 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 22 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:34,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:34,500 INFO L93 Difference]: Finished difference Result 859 states and 1004 transitions. [2021-05-06 12:05:34,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:05:34,500 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 22 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:34,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:34,501 INFO L225 Difference]: With dead ends: 859 [2021-05-06 12:05:34,501 INFO L226 Difference]: Without dead ends: 535 [2021-05-06 12:05:34,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 13 SyntacticMatches, 24 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 696.8ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:05:34,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-06 12:05:34,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 424. [2021-05-06 12:05:34,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:34,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:34,708 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:34,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:34,708 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:34,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 22 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:34,708 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:34,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:34,708 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:34,708 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:34,708 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable403 [2021-05-06 12:05:34,708 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:34,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:34,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1895278910, now seen corresponding path program 80 times [2021-05-06 12:05:34,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:34,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621174190] [2021-05-06 12:05:34,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:34,714 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:34,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:34,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:34,742 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:34,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:34,755 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:34,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,766 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:34,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:34,783 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:34,792 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:34,793 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:34,795 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:34,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:34,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:34,822 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:34,834 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:34,836 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:34,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:34,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:34,864 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:34,873 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:34,874 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:34,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:34,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:34,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:34,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:34,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:34,917 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:34,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:35,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:35,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621174190] [2021-05-06 12:05:35,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [621174190] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:35,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:35,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:05:35,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490563653] [2021-05-06 12:05:35,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:05:35,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:35,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:05:35,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:05:35,589 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:36,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:36,585 INFO L93 Difference]: Finished difference Result 877 states and 1022 transitions. [2021-05-06 12:05:36,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:05:36,586 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:36,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:36,586 INFO L225 Difference]: With dead ends: 877 [2021-05-06 12:05:36,587 INFO L226 Difference]: Without dead ends: 544 [2021-05-06 12:05:36,587 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 715.7ms TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:05:36,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-05-06 12:05:36,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 424. [2021-05-06 12:05:36,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:36,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:36,790 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:36,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:36,790 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:36,790 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:36,790 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:36,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:36,791 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:36,791 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:36,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable408 [2021-05-06 12:05:36,791 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:36,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:36,791 INFO L82 PathProgramCache]: Analyzing trace with hash -154108932, now seen corresponding path program 81 times [2021-05-06 12:05:36,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:36,791 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240815108] [2021-05-06 12:05:36,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:36,797 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:36,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:36,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:36,823 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:36,835 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:36,837 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:36,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:36,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:36,865 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:36,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:36,875 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:36,878 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:36,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:36,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:36,904 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:36,916 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:36,918 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:36,927 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,927 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,936 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:36,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:36,946 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:36,956 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:36,956 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:36,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:36,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:36,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:36,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:36,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:36,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:37,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:37,658 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:37,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240815108] [2021-05-06 12:05:37,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1240815108] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:37,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:37,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:05:37,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885263864] [2021-05-06 12:05:37,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:05:37,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:37,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:05:37,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:05:37,659 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:38,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:38,597 INFO L93 Difference]: Finished difference Result 868 states and 1013 transitions. [2021-05-06 12:05:38,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:05:38,597 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:38,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:38,598 INFO L225 Difference]: With dead ends: 868 [2021-05-06 12:05:38,598 INFO L226 Difference]: Without dead ends: 535 [2021-05-06 12:05:38,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 23 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 708.4ms TimeCoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:38,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-06 12:05:38,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 424. [2021-05-06 12:05:38,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:38,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:38,807 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:38,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:38,808 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:38,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:38,808 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:38,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:38,808 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:38,808 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:38,808 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable413 [2021-05-06 12:05:38,808 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:38,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:38,809 INFO L82 PathProgramCache]: Analyzing trace with hash 269537790, now seen corresponding path program 82 times [2021-05-06 12:05:38,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:38,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463400161] [2021-05-06 12:05:38,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:38,814 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:38,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:38,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:38,840 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:38,852 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:38,854 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:38,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:38,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:38,883 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:38,893 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:38,893 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:38,896 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:38,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:38,916 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:38,923 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:38,935 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:38,937 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:38,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,947 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:38,950 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:38,964 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:38,974 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:38,974 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:38,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:39,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:39,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:39,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:39,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:39,026 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:39,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:39,692 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:39,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463400161] [2021-05-06 12:05:39,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [463400161] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:39,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:39,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:05:39,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621185735] [2021-05-06 12:05:39,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:05:39,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:39,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:05:39,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:05:39,694 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:40,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:40,666 INFO L93 Difference]: Finished difference Result 859 states and 1004 transitions. [2021-05-06 12:05:40,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:05:40,667 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:40,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:40,667 INFO L225 Difference]: With dead ends: 859 [2021-05-06 12:05:40,667 INFO L226 Difference]: Without dead ends: 526 [2021-05-06 12:05:40,668 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 716.5ms TimeCoverageRelationStatistics Valid=131, Invalid=799, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:40,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-05-06 12:05:40,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 424. [2021-05-06 12:05:40,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:40,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:40,897 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:40,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:40,897 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:40,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:40,897 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:40,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:40,898 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:40,898 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:40,898 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable418 [2021-05-06 12:05:40,898 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:40,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:40,898 INFO L82 PathProgramCache]: Analyzing trace with hash -759821508, now seen corresponding path program 83 times [2021-05-06 12:05:40,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:40,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523953243] [2021-05-06 12:05:40,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:40,904 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:40,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:40,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:40,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:40,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:40,930 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:40,942 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:40,944 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:40,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:40,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:40,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:40,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:40,972 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:40,982 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:40,982 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:40,985 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:40,985 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:40,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:40,993 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:40,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:41,010 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:41,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:41,024 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:41,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:41,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:41,051 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:41,061 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:41,062 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:41,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:41,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:41,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:41,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:41,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:41,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:41,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:41,797 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:41,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523953243] [2021-05-06 12:05:41,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1523953243] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:41,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:41,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:05:41,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463374837] [2021-05-06 12:05:41,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:05:41,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:41,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:05:41,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:05:41,798 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:42,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:42,724 INFO L93 Difference]: Finished difference Result 850 states and 995 transitions. [2021-05-06 12:05:42,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:05:42,724 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:42,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:42,725 INFO L225 Difference]: With dead ends: 850 [2021-05-06 12:05:42,725 INFO L226 Difference]: Without dead ends: 517 [2021-05-06 12:05:42,726 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 577 ImplicationChecksByTransitivity, 755.6ms TimeCoverageRelationStatistics Valid=141, Invalid=851, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:42,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-05-06 12:05:42,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 424. [2021-05-06 12:05:42,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:42,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:42,949 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:42,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:42,949 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:42,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:42,949 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:42,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:42,949 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:42,949 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:42,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable423 [2021-05-06 12:05:42,949 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:42,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:42,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1603827010, now seen corresponding path program 84 times [2021-05-06 12:05:42,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:42,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1759111456] [2021-05-06 12:05:42,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:42,955 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:42,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:42,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:42,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:42,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:42,982 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:42,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:42,995 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:42,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:42,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:43,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:43,023 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:43,032 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:43,033 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:43,035 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:43,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:43,056 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:43,063 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:43,074 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:43,077 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:43,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,095 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:43,098 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:43,105 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:43,114 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:43,115 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:43,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:43,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:43,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:43,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:43,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:43,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:43,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:43,856 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:43,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1759111456] [2021-05-06 12:05:43,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1759111456] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:43,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:43,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:05:43,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525492792] [2021-05-06 12:05:43,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:05:43,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:43,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:05:43,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=801, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:43,857 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:44,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:44,594 INFO L93 Difference]: Finished difference Result 844 states and 985 transitions. [2021-05-06 12:05:44,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:05:44,595 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:44,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:44,596 INFO L225 Difference]: With dead ends: 844 [2021-05-06 12:05:44,596 INFO L226 Difference]: Without dead ends: 511 [2021-05-06 12:05:44,596 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 714.7ms TimeCoverageRelationStatistics Valid=150, Invalid=906, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:44,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-05-06 12:05:44,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 424. [2021-05-06 12:05:44,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:44,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:44,854 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:44,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:44,854 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:44,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:44,855 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:44,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:44,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:44,855 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:44,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable428 [2021-05-06 12:05:44,855 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:44,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:44,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1329067396, now seen corresponding path program 85 times [2021-05-06 12:05:44,855 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:44,855 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092272556] [2021-05-06 12:05:44,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:44,861 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:44,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:44,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:44,885 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:44,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:44,895 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:44,907 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:44,909 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:44,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:44,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:44,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:44,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:44,937 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:44,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:44,947 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:44,949 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:44,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:44,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:44,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:44,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:44,975 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:44,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:44,991 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:44,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,000 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:45,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:45,018 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:45,027 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:45,028 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:45,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:45,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:45,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:45,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:45,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:45,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:45,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:45,799 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:45,799 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092272556] [2021-05-06 12:05:45,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2092272556] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:45,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:45,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:05:45,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341173225] [2021-05-06 12:05:45,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:05:45,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:45,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:05:45,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:45,800 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:46,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:46,691 INFO L93 Difference]: Finished difference Result 832 states and 977 transitions. [2021-05-06 12:05:46,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:05:46,692 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:46,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:46,692 INFO L225 Difference]: With dead ends: 832 [2021-05-06 12:05:46,692 INFO L226 Difference]: Without dead ends: 499 [2021-05-06 12:05:46,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 19 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 750.7ms TimeCoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:46,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2021-05-06 12:05:46,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 424. [2021-05-06 12:05:46,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:46,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:46,911 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:46,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:46,912 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:46,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:46,912 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:46,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:46,912 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:46,912 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:46,912 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable433 [2021-05-06 12:05:46,912 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:46,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:46,912 INFO L82 PathProgramCache]: Analyzing trace with hash 57135998, now seen corresponding path program 86 times [2021-05-06 12:05:46,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:46,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1515793445] [2021-05-06 12:05:46,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:46,922 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:46,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:46,924 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:46,930 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:46,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:46,949 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:46,960 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:46,962 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:46,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:46,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:46,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:46,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:46,990 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:46,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:47,000 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:47,002 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:47,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:47,012 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:47,028 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:47,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:47,042 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:47,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:47,063 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:47,070 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:47,080 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:47,080 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:47,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:47,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:47,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:47,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:47,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:47,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:47,891 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:47,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1515793445] [2021-05-06 12:05:47,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1515793445] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:47,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:47,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:05:47,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913895660] [2021-05-06 12:05:47,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:05:47,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:47,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:05:47,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=856, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:47,892 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:48,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:48,711 INFO L93 Difference]: Finished difference Result 823 states and 968 transitions. [2021-05-06 12:05:48,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:05:48,711 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:48,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:48,712 INFO L225 Difference]: With dead ends: 823 [2021-05-06 12:05:48,712 INFO L226 Difference]: Without dead ends: 490 [2021-05-06 12:05:48,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 18 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 815.2ms TimeCoverageRelationStatistics Valid=171, Invalid=1019, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:48,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2021-05-06 12:05:48,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 424. [2021-05-06 12:05:48,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:48,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:48,946 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:48,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:48,946 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:48,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:48,946 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:48,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:48,946 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:48,946 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:48,946 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable438 [2021-05-06 12:05:48,946 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:48,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:48,947 INFO L82 PathProgramCache]: Analyzing trace with hash 119175612, now seen corresponding path program 87 times [2021-05-06 12:05:48,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:48,947 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88845831] [2021-05-06 12:05:48,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:48,953 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:48,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:48,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:48,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:48,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:48,981 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:48,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:48,995 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:49,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:49,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:49,024 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:49,033 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:49,034 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:49,036 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:49,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,048 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:49,056 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:49,064 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:49,076 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:49,078 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:49,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,080 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,088 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:49,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:49,106 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:49,116 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:49,116 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:49,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:49,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:49,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:49,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:49,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:49,160 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:49,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:49,924 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:49,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [88845831] [2021-05-06 12:05:49,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [88845831] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:49,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:49,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:05:49,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892538582] [2021-05-06 12:05:49,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:05:49,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:49,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:05:49,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=912, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:49,925 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:50,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:50,763 INFO L93 Difference]: Finished difference Result 814 states and 959 transitions. [2021-05-06 12:05:50,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:05:50,764 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:50,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:50,765 INFO L225 Difference]: With dead ends: 814 [2021-05-06 12:05:50,765 INFO L226 Difference]: Without dead ends: 481 [2021-05-06 12:05:50,765 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 17 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 824.9ms TimeCoverageRelationStatistics Valid=181, Invalid=1079, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:50,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2021-05-06 12:05:50,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 424. [2021-05-06 12:05:50,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:50,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:50,995 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:50,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:50,995 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:50,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:50,995 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:50,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:50,996 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:50,996 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:50,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable443 [2021-05-06 12:05:50,996 INFO L428 AbstractCegarLoop]: === Iteration 102 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:50,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:50,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1686262722, now seen corresponding path program 88 times [2021-05-06 12:05:50,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:50,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187150520] [2021-05-06 12:05:50,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:51,002 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:51,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:51,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:51,031 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:51,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:51,046 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:51,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,056 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:51,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:51,074 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:51,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:51,085 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:51,087 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:51,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,099 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:51,108 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:51,116 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:51,128 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:51,131 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:51,131 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,132 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:51,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:51,158 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:51,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:51,169 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:51,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:51,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:51,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:51,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:51,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:51,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:51,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:51,974 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:51,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187150520] [2021-05-06 12:05:51,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [187150520] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:51,975 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:51,975 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:05:51,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97354396] [2021-05-06 12:05:51,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:05:51,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:51,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:05:51,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=970, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:51,975 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:52,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:52,864 INFO L93 Difference]: Finished difference Result 805 states and 950 transitions. [2021-05-06 12:05:52,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:05:52,865 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:52,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:52,866 INFO L225 Difference]: With dead ends: 805 [2021-05-06 12:05:52,866 INFO L226 Difference]: Without dead ends: 472 [2021-05-06 12:05:52,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 15 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 805.1ms TimeCoverageRelationStatistics Valid=191, Invalid=1141, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:52,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-05-06 12:05:53,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 424. [2021-05-06 12:05:53,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:53,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:53,095 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:53,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:53,095 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:53,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:53,096 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:53,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:53,096 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:53,096 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:53,096 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable448 [2021-05-06 12:05:53,096 INFO L428 AbstractCegarLoop]: === Iteration 103 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:53,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:53,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1791056124, now seen corresponding path program 89 times [2021-05-06 12:05:53,096 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:53,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708283319] [2021-05-06 12:05:53,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:53,105 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:53,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,124 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:53,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:53,133 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:53,145 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:53,148 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:53,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:53,169 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:53,176 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:53,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:53,187 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:53,189 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:53,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:53,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:53,216 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:53,228 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:53,231 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:53,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:53,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:53,263 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:53,273 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:53,274 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:53,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:53,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:53,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:53,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:53,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:53,341 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:53,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:54,100 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:54,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708283319] [2021-05-06 12:05:54,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [708283319] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:54,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:54,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:05:54,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135983603] [2021-05-06 12:05:54,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:05:54,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:54,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:05:54,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1030, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:54,101 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:54,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:54,899 INFO L93 Difference]: Finished difference Result 796 states and 941 transitions. [2021-05-06 12:05:54,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:05:54,899 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:54,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:54,900 INFO L225 Difference]: With dead ends: 796 [2021-05-06 12:05:54,900 INFO L226 Difference]: Without dead ends: 463 [2021-05-06 12:05:54,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 15 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 805.2ms TimeCoverageRelationStatistics Valid=201, Invalid=1205, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:05:54,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2021-05-06 12:05:55,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 424. [2021-05-06 12:05:55,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:55,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:55,143 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:55,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:55,144 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:55,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:55,144 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:55,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:55,144 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:55,144 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:55,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable453 [2021-05-06 12:05:55,144 INFO L428 AbstractCegarLoop]: === Iteration 104 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:55,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:55,145 INFO L82 PathProgramCache]: Analyzing trace with hash 202708222, now seen corresponding path program 90 times [2021-05-06 12:05:55,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:55,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335024683] [2021-05-06 12:05:55,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:55,151 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:55,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:55,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:55,180 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:55,191 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,193 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:55,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:55,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:55,217 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:55,224 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,225 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:55,238 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:55,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:55,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:55,264 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:55,275 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,277 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:55,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:55,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:55,303 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:55,311 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,312 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:55,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:55,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:55,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:55,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:55,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:55,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:55,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:55,900 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:55,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335024683] [2021-05-06 12:05:55,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [335024683] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:55,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:55,901 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:05:55,901 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104174897] [2021-05-06 12:05:55,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:05:55,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:55,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:05:55,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1092, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:55,901 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:56,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:56,649 INFO L93 Difference]: Finished difference Result 791 states and 936 transitions. [2021-05-06 12:05:56,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:05:56,649 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:56,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:56,650 INFO L225 Difference]: With dead ends: 791 [2021-05-06 12:05:56,650 INFO L226 Difference]: Without dead ends: 458 [2021-05-06 12:05:56,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 13 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 610 ImplicationChecksByTransitivity, 584.4ms TimeCoverageRelationStatistics Valid=211, Invalid=1271, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:05:56,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2021-05-06 12:05:56,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 424. [2021-05-06 12:05:56,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 409 states have (on average 1.1858190709046454) internal successors, (485), 412 states have internal predecessors, (485), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:56,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 502 transitions. [2021-05-06 12:05:56,879 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 502 transitions. Word has length 64 [2021-05-06 12:05:56,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:56,879 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 502 transitions. [2021-05-06 12:05:56,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:56,879 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 502 transitions. [2021-05-06 12:05:56,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:56,879 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:56,879 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:56,879 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable458 [2021-05-06 12:05:56,879 INFO L428 AbstractCegarLoop]: === Iteration 105 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:56,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:56,880 INFO L82 PathProgramCache]: Analyzing trace with hash -808409028, now seen corresponding path program 91 times [2021-05-06 12:05:56,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:56,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40495156] [2021-05-06 12:05:56,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:56,885 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:56,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,895 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:56,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:56,915 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:56,924 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:56,925 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:05:56,927 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:56,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,939 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,946 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:56,947 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:56,955 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:56,966 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:56,969 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:56,977 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,987 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:56,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:56,997 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:57,006 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:57,007 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:57,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:57,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:57,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:57,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:57,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:57,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:57,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:57,880 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:57,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40495156] [2021-05-06 12:05:57,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [40495156] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:57,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:57,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:05:57,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333271847] [2021-05-06 12:05:57,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:05:57,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:57,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:05:57,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1156, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:57,881 INFO L87 Difference]: Start difference. First operand 424 states and 502 transitions. Second operand has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:58,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:58,673 INFO L93 Difference]: Finished difference Result 805 states and 960 transitions. [2021-05-06 12:05:58,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:05:58,674 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:05:58,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:58,675 INFO L225 Difference]: With dead ends: 805 [2021-05-06 12:05:58,675 INFO L226 Difference]: Without dead ends: 461 [2021-05-06 12:05:58,675 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 12 SyntacticMatches, 13 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 860.5ms TimeCoverageRelationStatistics Valid=221, Invalid=1339, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:05:58,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-05-06 12:05:58,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 436. [2021-05-06 12:05:58,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 421 states have (on average 1.190023752969121) internal successors, (501), 424 states have internal predecessors, (501), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:58,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 518 transitions. [2021-05-06 12:05:58,914 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 518 transitions. Word has length 64 [2021-05-06 12:05:58,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:58,915 INFO L480 AbstractCegarLoop]: Abstraction has 436 states and 518 transitions. [2021-05-06 12:05:58,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:58,915 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 518 transitions. [2021-05-06 12:05:58,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:05:58,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:58,915 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:58,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable462 [2021-05-06 12:05:58,915 INFO L428 AbstractCegarLoop]: === Iteration 106 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:58,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:58,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1878189759, now seen corresponding path program 92 times [2021-05-06 12:05:58,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:58,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590276615] [2021-05-06 12:05:58,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:58,923 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:58,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,924 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:58,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:58,948 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:58,960 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:58,962 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:58,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:58,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:58,989 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:58,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,000 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:59,002 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:59,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:59,013 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:59,029 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:59,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,044 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:59,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,054 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,062 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:59,065 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:59,072 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:59,082 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,082 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:59,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:59,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:59,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:59,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:59,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:59,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:59,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:59,863 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:59,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590276615] [2021-05-06 12:05:59,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1590276615] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:59,863 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:59,863 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:05:59,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141809656] [2021-05-06 12:05:59,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:05:59,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:59,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:05:59,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:05:59,877 INFO L87 Difference]: Start difference. First operand 436 states and 518 transitions. Second operand has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 23 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:01,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:01,026 INFO L93 Difference]: Finished difference Result 907 states and 1059 transitions. [2021-05-06 12:06:01,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:06:01,026 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 23 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:01,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:01,027 INFO L225 Difference]: With dead ends: 907 [2021-05-06 12:06:01,027 INFO L226 Difference]: Without dead ends: 565 [2021-05-06 12:06:01,028 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 27 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 774.9ms TimeCoverageRelationStatistics Valid=104, Invalid=708, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:06:01,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-06 12:06:01,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 445. [2021-05-06 12:06:01,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:01,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:01,298 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:01,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:01,299 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:01,299 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 23 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:01,299 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:01,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:01,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:01,299 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:01,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable467 [2021-05-06 12:06:01,299 INFO L428 AbstractCegarLoop]: === Iteration 107 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:01,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:01,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1397109501, now seen corresponding path program 93 times [2021-05-06 12:06:01,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:01,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722628802] [2021-05-06 12:06:01,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:01,305 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:01,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:01,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:01,334 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:01,345 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,347 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:01,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:01,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:01,376 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:01,386 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,387 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:01,389 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:01,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:01,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:01,416 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:01,428 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,431 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:01,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,440 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,449 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:01,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:01,459 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:01,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,470 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:01,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:01,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:01,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:01,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:01,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:01,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:01,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:02,244 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:02,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722628802] [2021-05-06 12:06:02,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1722628802] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:02,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:02,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:06:02,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667414270] [2021-05-06 12:06:02,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:06:02,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:02,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:06:02,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=656, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:06:02,246 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:03,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:03,328 INFO L93 Difference]: Finished difference Result 916 states and 1064 transitions. [2021-05-06 12:06:03,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:06:03,328 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:03,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:03,329 INFO L225 Difference]: With dead ends: 916 [2021-05-06 12:06:03,329 INFO L226 Difference]: Without dead ends: 565 [2021-05-06 12:06:03,330 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 26 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 753.7ms TimeCoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:06:03,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-06 12:06:03,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 445. [2021-05-06 12:06:03,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:03,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:03,616 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:03,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:03,616 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:03,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:03,617 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:03,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:03,617 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:03,617 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:03,617 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable472 [2021-05-06 12:06:03,617 INFO L428 AbstractCegarLoop]: === Iteration 108 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:03,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:03,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1044021119, now seen corresponding path program 94 times [2021-05-06 12:06:03,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:03,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1726296475] [2021-05-06 12:06:03,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:03,623 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:03,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:03,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:03,651 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:03,663 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,665 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:03,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,675 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:03,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:03,692 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:03,702 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,703 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:03,705 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:03,716 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:03,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:03,734 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:03,746 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,748 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:03,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:03,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:03,777 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:03,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,787 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:03,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:03,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:03,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:03,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:03,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:03,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:03,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:04,575 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:04,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1726296475] [2021-05-06 12:06:04,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1726296475] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:04,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:04,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:06:04,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616813124] [2021-05-06 12:06:04,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:06:04,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:04,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:06:04,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=657, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:06:04,576 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 25 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:05,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:05,808 INFO L93 Difference]: Finished difference Result 916 states and 1068 transitions. [2021-05-06 12:06:05,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:06:05,809 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 25 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:05,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:05,810 INFO L225 Difference]: With dead ends: 916 [2021-05-06 12:06:05,810 INFO L226 Difference]: Without dead ends: 565 [2021-05-06 12:06:05,810 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 25 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 786.6ms TimeCoverageRelationStatistics Valid=124, Invalid=806, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:06:05,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-06 12:06:06,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 445. [2021-05-06 12:06:06,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:06,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:06,155 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:06,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:06,155 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:06,155 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 25 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:06,155 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:06,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:06,156 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:06,156 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:06,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable477 [2021-05-06 12:06:06,156 INFO L428 AbstractCegarLoop]: === Iteration 109 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:06,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:06,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1005366723, now seen corresponding path program 95 times [2021-05-06 12:06:06,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:06,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919636867] [2021-05-06 12:06:06,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:06,162 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:06,163 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:06,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:06,193 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:06,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,207 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:06,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:06,231 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:06,238 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:06,248 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,249 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:06,252 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:06,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:06,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:06,282 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:06,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,304 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:06,313 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:06,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:06,333 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:06,342 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,344 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:06,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:06,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:06,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:06,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:06,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:06,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:06,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:07,074 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:07,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919636867] [2021-05-06 12:06:07,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1919636867] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:07,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:07,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:06:07,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543242123] [2021-05-06 12:06:07,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:06:07,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:07,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:06:07,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=705, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:06:07,075 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:08,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:08,258 INFO L93 Difference]: Finished difference Result 907 states and 1059 transitions. [2021-05-06 12:06:08,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:06:08,258 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:08,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:08,259 INFO L225 Difference]: With dead ends: 907 [2021-05-06 12:06:08,259 INFO L226 Difference]: Without dead ends: 556 [2021-05-06 12:06:08,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 705.3ms TimeCoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:08,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-06 12:06:08,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 445. [2021-05-06 12:06:08,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:08,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:08,606 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:08,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:08,606 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:08,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:08,606 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:08,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:08,610 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:08,610 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:08,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable482 [2021-05-06 12:06:08,610 INFO L428 AbstractCegarLoop]: === Iteration 110 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:08,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:08,610 INFO L82 PathProgramCache]: Analyzing trace with hash -581720001, now seen corresponding path program 96 times [2021-05-06 12:06:08,610 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:08,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163909207] [2021-05-06 12:06:08,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:08,616 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:08,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:08,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:08,641 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:08,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:08,655 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:08,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:08,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:08,695 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:08,707 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:08,708 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:08,711 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:08,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,727 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:08,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:08,759 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:08,773 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:08,776 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:08,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,778 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:08,789 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:08,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:08,809 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:08,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:08,821 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:08,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:08,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:08,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:08,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:09,647 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:09,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163909207] [2021-05-06 12:06:09,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [163909207] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:09,647 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:09,647 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:06:09,647 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090668095] [2021-05-06 12:06:09,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:06:09,647 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:09,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:06:09,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=755, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:06:09,648 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 28 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:10,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:10,837 INFO L93 Difference]: Finished difference Result 898 states and 1050 transitions. [2021-05-06 12:06:10,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:06:10,838 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:10,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:10,839 INFO L225 Difference]: With dead ends: 898 [2021-05-06 12:06:10,839 INFO L226 Difference]: Without dead ends: 547 [2021-05-06 12:06:10,839 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 23 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 805.7ms TimeCoverageRelationStatistics Valid=144, Invalid=912, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:10,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-05-06 12:06:11,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 445. [2021-05-06 12:06:11,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:11,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:11,216 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:11,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:11,216 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:11,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:11,216 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:11,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:11,216 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:11,216 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:11,217 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable487 [2021-05-06 12:06:11,217 INFO L428 AbstractCegarLoop]: === Iteration 111 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:11,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:11,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1611079299, now seen corresponding path program 97 times [2021-05-06 12:06:11,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:11,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169735350] [2021-05-06 12:06:11,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:11,225 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:11,235 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:11,244 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:11,250 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:11,259 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:11,262 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:11,262 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,300 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:11,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:11,315 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:11,323 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:11,323 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:11,326 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:11,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:11,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:11,350 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:11,359 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:11,361 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:11,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:11,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:11,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:11,386 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:11,403 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:11,404 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:11,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:11,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:11,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:11,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:11,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:11,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:11,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:12,110 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:12,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169735350] [2021-05-06 12:06:12,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [169735350] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:12,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:12,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:06:12,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714714842] [2021-05-06 12:06:12,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:06:12,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:12,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:06:12,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=860, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:12,112 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:13,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:13,160 INFO L93 Difference]: Finished difference Result 892 states and 1040 transitions. [2021-05-06 12:06:13,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:06:13,161 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:13,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:13,161 INFO L225 Difference]: With dead ends: 892 [2021-05-06 12:06:13,161 INFO L226 Difference]: Without dead ends: 541 [2021-05-06 12:06:13,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 652.1ms TimeCoverageRelationStatistics Valid=153, Invalid=969, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:13,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-06 12:06:13,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 445. [2021-05-06 12:06:13,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:13,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:13,450 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:13,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:13,450 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:13,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:13,451 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:13,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:13,451 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:13,451 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:13,451 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable492 [2021-05-06 12:06:13,451 INFO L428 AbstractCegarLoop]: === Iteration 112 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:13,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:13,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1839882495, now seen corresponding path program 98 times [2021-05-06 12:06:13,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:13,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582290348] [2021-05-06 12:06:13,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:13,467 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:13,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:13,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:13,496 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:13,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:13,510 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:13,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:13,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:13,539 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:13,549 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:13,549 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:13,552 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:13,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:13,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:13,579 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:13,590 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:13,593 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:13,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:13,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:13,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:13,621 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:13,631 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:13,632 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:13,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:13,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:13,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:13,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:13,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:13,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:13,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:14,466 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:14,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582290348] [2021-05-06 12:06:14,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1582290348] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:14,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:14,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:06:14,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124346115] [2021-05-06 12:06:14,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:06:14,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:14,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:06:14,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:14,467 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:15,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:15,654 INFO L93 Difference]: Finished difference Result 880 states and 1032 transitions. [2021-05-06 12:06:15,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:06:15,654 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:15,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:15,655 INFO L225 Difference]: With dead ends: 880 [2021-05-06 12:06:15,655 INFO L226 Difference]: Without dead ends: 529 [2021-05-06 12:06:15,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 840.3ms TimeCoverageRelationStatistics Valid=164, Invalid=1026, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:15,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-05-06 12:06:16,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 445. [2021-05-06 12:06:16,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:16,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:16,022 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:16,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:16,022 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:16,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:16,022 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:16,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:16,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:16,023 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:16,023 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable497 [2021-05-06 12:06:16,023 INFO L428 AbstractCegarLoop]: === Iteration 113 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:16,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:16,023 INFO L82 PathProgramCache]: Analyzing trace with hash 2114642109, now seen corresponding path program 99 times [2021-05-06 12:06:16,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:16,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341885053] [2021-05-06 12:06:16,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:16,028 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:16,040 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:16,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:16,057 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:16,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:16,070 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:16,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,080 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:16,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:16,098 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:16,108 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:16,109 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:16,111 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:16,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,124 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:16,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:16,141 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:16,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:16,155 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:16,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:16,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:16,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:16,182 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:16,191 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:16,192 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:16,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:16,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:16,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:16,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:16,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:16,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:16,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:17,044 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:17,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341885053] [2021-05-06 12:06:17,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [341885053] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:17,045 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:17,045 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:06:17,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613674308] [2021-05-06 12:06:17,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:06:17,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:17,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:06:17,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=917, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:17,045 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:18,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:18,131 INFO L93 Difference]: Finished difference Result 871 states and 1023 transitions. [2021-05-06 12:06:18,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:06:18,131 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:18,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:18,132 INFO L225 Difference]: With dead ends: 871 [2021-05-06 12:06:18,132 INFO L226 Difference]: Without dead ends: 520 [2021-05-06 12:06:18,132 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 845.6ms TimeCoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:06:18,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-05-06 12:06:18,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 445. [2021-05-06 12:06:18,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:18,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:18,461 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:18,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:18,461 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:18,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:18,461 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:18,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:18,461 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:18,461 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:18,461 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable502 [2021-05-06 12:06:18,461 INFO L428 AbstractCegarLoop]: === Iteration 114 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:18,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:18,462 INFO L82 PathProgramCache]: Analyzing trace with hash -794121793, now seen corresponding path program 100 times [2021-05-06 12:06:18,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:18,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112492703] [2021-05-06 12:06:18,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:18,479 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:18,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,493 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:18,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:18,509 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:18,521 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:18,527 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:18,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:18,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:18,556 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:18,566 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:18,567 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:18,569 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:18,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:18,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:18,599 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:18,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:18,613 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:18,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:18,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:18,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:18,642 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:18,651 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:18,652 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:18,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:18,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:18,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:18,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:18,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:18,697 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:18,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:19,353 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:19,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112492703] [2021-05-06 12:06:19,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1112492703] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:19,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:19,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:06:19,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640478123] [2021-05-06 12:06:19,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:06:19,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:19,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:06:19,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=975, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:19,354 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 32 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:20,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:20,423 INFO L93 Difference]: Finished difference Result 862 states and 1014 transitions. [2021-05-06 12:06:20,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:06:20,423 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:20,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:20,424 INFO L225 Difference]: With dead ends: 862 [2021-05-06 12:06:20,424 INFO L226 Difference]: Without dead ends: 511 [2021-05-06 12:06:20,424 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 16 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 695.3ms TimeCoverageRelationStatistics Valid=184, Invalid=1148, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:06:20,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-05-06 12:06:20,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 445. [2021-05-06 12:06:20,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:20,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:20,731 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:20,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:20,731 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:20,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:20,731 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:20,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:20,731 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:20,731 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:20,731 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable507 [2021-05-06 12:06:20,731 INFO L428 AbstractCegarLoop]: === Iteration 115 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:20,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:20,732 INFO L82 PathProgramCache]: Analyzing trace with hash -732082179, now seen corresponding path program 101 times [2021-05-06 12:06:20,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:20,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848783812] [2021-05-06 12:06:20,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:20,737 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:20,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:20,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:20,763 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:20,775 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:20,777 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:20,778 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,779 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,788 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:20,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:20,805 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:20,815 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:20,816 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:20,818 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:20,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:20,828 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:20,844 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:20,856 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:20,858 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:20,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:20,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:20,886 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:20,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:20,896 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:20,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:20,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:20,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:20,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:20,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:20,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:20,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:21,775 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:21,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848783812] [2021-05-06 12:06:21,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [848783812] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:21,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:21,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:06:21,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175609799] [2021-05-06 12:06:21,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:06:21,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:21,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:06:21,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1035, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:21,776 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:22,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:22,854 INFO L93 Difference]: Finished difference Result 853 states and 1005 transitions. [2021-05-06 12:06:22,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:06:22,854 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:22,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:22,855 INFO L225 Difference]: With dead ends: 853 [2021-05-06 12:06:22,855 INFO L226 Difference]: Without dead ends: 502 [2021-05-06 12:06:22,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 18 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 882.6ms TimeCoverageRelationStatistics Valid=194, Invalid=1212, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:06:22,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-05-06 12:06:23,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 445. [2021-05-06 12:06:23,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:23,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:23,156 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:23,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:23,156 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:23,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:23,156 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:23,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:23,156 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:23,156 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:23,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable512 [2021-05-06 12:06:23,157 INFO L428 AbstractCegarLoop]: === Iteration 116 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:23,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:23,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1757446783, now seen corresponding path program 102 times [2021-05-06 12:06:23,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:23,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1062229019] [2021-05-06 12:06:23,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:23,162 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:23,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:23,182 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:23,190 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:23,201 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:23,203 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:23,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:23,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:23,232 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:23,241 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:23,242 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:23,244 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:23,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:23,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:23,272 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:23,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:23,286 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:23,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,296 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:23,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:23,312 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:23,322 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:23,323 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:23,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:23,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:23,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:23,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:23,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:23,365 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:23,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:24,194 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:24,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1062229019] [2021-05-06 12:06:24,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1062229019] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:24,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:24,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:06:24,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228028710] [2021-05-06 12:06:24,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:06:24,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:24,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:06:24,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1097, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:06:24,195 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:25,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:25,673 INFO L93 Difference]: Finished difference Result 844 states and 996 transitions. [2021-05-06 12:06:25,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:06:25,674 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:25,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:25,674 INFO L225 Difference]: With dead ends: 844 [2021-05-06 12:06:25,674 INFO L226 Difference]: Without dead ends: 493 [2021-05-06 12:06:25,675 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 13 SyntacticMatches, 16 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 876.1ms TimeCoverageRelationStatistics Valid=204, Invalid=1278, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:06:25,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-05-06 12:06:25,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 445. [2021-05-06 12:06:25,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:25,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:25,977 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:25,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:25,977 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:25,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:25,977 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:25,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:25,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:25,977 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:25,978 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable517 [2021-05-06 12:06:25,978 INFO L428 AbstractCegarLoop]: === Iteration 117 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:25,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:25,978 INFO L82 PathProgramCache]: Analyzing trace with hash 939798333, now seen corresponding path program 103 times [2021-05-06 12:06:25,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:25,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052065422] [2021-05-06 12:06:25,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:25,983 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:25,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:25,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,002 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:26,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:26,012 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:26,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:26,025 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:26,034 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,035 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,043 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:26,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:26,053 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:26,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:26,063 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:26,066 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:26,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:26,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:26,094 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:26,105 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:26,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:26,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:26,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:26,134 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:26,144 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:26,144 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:26,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:26,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:26,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:26,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:26,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:26,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:26,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:27,051 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:27,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052065422] [2021-05-06 12:06:27,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1052065422] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:27,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:27,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:06:27,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136313794] [2021-05-06 12:06:27,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:06:27,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:27,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:06:27,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1161, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:06:27,053 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:28,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:28,204 INFO L93 Difference]: Finished difference Result 835 states and 987 transitions. [2021-05-06 12:06:28,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:06:28,204 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:28,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:28,205 INFO L225 Difference]: With dead ends: 835 [2021-05-06 12:06:28,205 INFO L226 Difference]: Without dead ends: 484 [2021-05-06 12:06:28,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 16 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 909.7ms TimeCoverageRelationStatistics Valid=214, Invalid=1346, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:06:28,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2021-05-06 12:06:28,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 445. [2021-05-06 12:06:28,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:28,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:28,572 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:28,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:28,572 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:28,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:28,573 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:28,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:28,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:28,573 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:28,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable522 [2021-05-06 12:06:28,573 INFO L428 AbstractCegarLoop]: === Iteration 118 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:28,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:28,573 INFO L82 PathProgramCache]: Analyzing trace with hash -648549569, now seen corresponding path program 104 times [2021-05-06 12:06:28,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:28,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459589235] [2021-05-06 12:06:28,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:28,579 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:28,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:28,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:28,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:28,616 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:28,618 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:28,619 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,620 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,630 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:28,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:28,651 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:28,663 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:28,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:28,666 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:28,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,675 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:28,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:28,696 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:28,709 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:28,712 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:28,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:28,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:28,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:28,742 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:28,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:28,754 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:28,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:28,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:28,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:28,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:28,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:28,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:28,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:29,659 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:29,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459589235] [2021-05-06 12:06:29,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [459589235] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:29,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:29,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:06:29,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473960760] [2021-05-06 12:06:29,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:06:29,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:29,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:06:29,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1295, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:06:29,660 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:31,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:31,220 INFO L93 Difference]: Finished difference Result 854 states and 1002 transitions. [2021-05-06 12:06:31,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:06:31,221 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:31,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:31,221 INFO L225 Difference]: With dead ends: 854 [2021-05-06 12:06:31,221 INFO L226 Difference]: Without dead ends: 503 [2021-05-06 12:06:31,222 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 13 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 688 ImplicationChecksByTransitivity, 870.3ms TimeCoverageRelationStatistics Valid=191, Invalid=1369, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:06:31,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 503 states. [2021-05-06 12:06:31,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 503 to 445. [2021-05-06 12:06:31,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 430 states have (on average 1.186046511627907) internal successors, (510), 433 states have internal predecessors, (510), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:31,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 527 transitions. [2021-05-06 12:06:31,533 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 527 transitions. Word has length 67 [2021-05-06 12:06:31,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:31,533 INFO L480 AbstractCegarLoop]: Abstraction has 445 states and 527 transitions. [2021-05-06 12:06:31,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:31,533 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 527 transitions. [2021-05-06 12:06:31,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:31,534 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:31,534 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:31,534 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable527 [2021-05-06 12:06:31,534 INFO L428 AbstractCegarLoop]: === Iteration 119 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:31,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:31,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1659666819, now seen corresponding path program 105 times [2021-05-06 12:06:31,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:31,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659388041] [2021-05-06 12:06:31,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:31,538 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:31,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,549 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:31,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:31,566 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:31,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:31,577 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:06:31,579 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:31,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:31,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:31,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:31,617 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:31,619 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:31,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:31,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:31,648 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:31,658 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:31,658 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:31,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:31,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:31,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:31,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:31,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:31,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:31,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:32,619 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:32,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659388041] [2021-05-06 12:06:32,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [659388041] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:32,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:32,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:06:32,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803793592] [2021-05-06 12:06:32,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:06:32,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:32,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:06:32,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1295, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:06:32,620 INFO L87 Difference]: Start difference. First operand 445 states and 527 transitions. Second operand has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:33,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:33,790 INFO L93 Difference]: Finished difference Result 844 states and 1006 transitions. [2021-05-06 12:06:33,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:06:33,790 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:33,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:33,791 INFO L225 Difference]: With dead ends: 844 [2021-05-06 12:06:33,791 INFO L226 Difference]: Without dead ends: 482 [2021-05-06 12:06:33,791 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 12 SyntacticMatches, 14 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 679 ImplicationChecksByTransitivity, 960.8ms TimeCoverageRelationStatistics Valid=234, Invalid=1488, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:06:33,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2021-05-06 12:06:34,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 457. [2021-05-06 12:06:34,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 442 states have (on average 1.1900452488687783) internal successors, (526), 445 states have internal predecessors, (526), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:34,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 543 transitions. [2021-05-06 12:06:34,096 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 543 transitions. Word has length 67 [2021-05-06 12:06:34,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:34,096 INFO L480 AbstractCegarLoop]: Abstraction has 457 states and 543 transitions. [2021-05-06 12:06:34,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:34,096 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 543 transitions. [2021-05-06 12:06:34,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 12:06:34,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:34,097 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:34,097 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable531 [2021-05-06 12:06:34,097 INFO L428 AbstractCegarLoop]: === Iteration 120 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:34,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:34,097 INFO L82 PathProgramCache]: Analyzing trace with hash 420722915, now seen corresponding path program 6 times [2021-05-06 12:06:34,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:34,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383270424] [2021-05-06 12:06:34,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:34,107 WARN L240 tifierPushTermWalker]: treesize reduction 74, result has 49.7 percent of original size [2021-05-06 12:06:34,144 WARN L245 tifierPushTermWalker]: treesize reduction 74, result has 49.7 percent of original size 73 [2021-05-06 12:06:34,170 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:34,176 WARN L240 tifierPushTermWalker]: treesize reduction 78, result has 50.3 percent of original size [2021-05-06 12:06:34,200 WARN L245 tifierPushTermWalker]: treesize reduction 78, result has 50.3 percent of original size 79 [2021-05-06 12:06:34,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:34,206 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:34,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:34,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:34,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:34,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:34,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:34,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:34,447 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:34,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383270424] [2021-05-06 12:06:34,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [383270424] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:34,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:34,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:06:34,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249742097] [2021-05-06 12:06:34,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:06:34,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:34,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:06:34,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:06:34,449 INFO L87 Difference]: Start difference. First operand 457 states and 543 transitions. Second operand has 19 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 18 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:06:34,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:34,987 INFO L93 Difference]: Finished difference Result 846 states and 1002 transitions. [2021-05-06 12:06:34,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:06:34,988 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 18 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2021-05-06 12:06:34,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:34,989 INFO L225 Difference]: With dead ends: 846 [2021-05-06 12:06:34,989 INFO L226 Difference]: Without dead ends: 477 [2021-05-06 12:06:34,989 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 24 SyntacticMatches, 12 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 290.5ms TimeCoverageRelationStatistics Valid=197, Invalid=453, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:06:34,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2021-05-06 12:06:35,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 469. [2021-05-06 12:06:35,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 454 states have (on average 1.1850220264317182) internal successors, (538), 457 states have internal predecessors, (538), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:35,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 555 transitions. [2021-05-06 12:06:35,302 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 555 transitions. Word has length 69 [2021-05-06 12:06:35,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:35,302 INFO L480 AbstractCegarLoop]: Abstraction has 469 states and 555 transitions. [2021-05-06 12:06:35,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 18 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:06:35,302 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 555 transitions. [2021-05-06 12:06:35,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:35,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:35,303 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:35,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable532 [2021-05-06 12:06:35,303 INFO L428 AbstractCegarLoop]: === Iteration 121 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:35,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:35,303 INFO L82 PathProgramCache]: Analyzing trace with hash -899647012, now seen corresponding path program 106 times [2021-05-06 12:06:35,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:35,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118118817] [2021-05-06 12:06:35,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:35,308 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:35,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:35,318 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:35,335 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:35,347 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,349 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:35,350 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,350 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:35,362 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:35,376 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:35,385 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,386 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:35,388 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:35,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:35,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:35,417 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:35,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,431 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:35,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,432 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:35,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:35,459 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:35,468 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,469 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:35,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:35,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:35,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:35,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:35,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:35,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:35,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:36,298 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:36,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118118817] [2021-05-06 12:06:36,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2118118817] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:36,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:36,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:06:36,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819316015] [2021-05-06 12:06:36,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:06:36,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:36,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:06:36,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:06:36,299 INFO L87 Difference]: Start difference. First operand 469 states and 555 transitions. Second operand has 25 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:37,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:37,701 INFO L93 Difference]: Finished difference Result 976 states and 1135 transitions. [2021-05-06 12:06:37,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:06:37,702 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:37,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:37,703 INFO L225 Difference]: With dead ends: 976 [2021-05-06 12:06:37,703 INFO L226 Difference]: Without dead ends: 607 [2021-05-06 12:06:37,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 13 SyntacticMatches, 28 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 837.8ms TimeCoverageRelationStatistics Valid=107, Invalid=763, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:06:37,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-05-06 12:06:38,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 478. [2021-05-06 12:06:38,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:38,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:38,040 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:38,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:38,040 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:38,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:38,041 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:38,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:38,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:38,041 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:38,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable537 [2021-05-06 12:06:38,041 INFO L428 AbstractCegarLoop]: === Iteration 122 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:38,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:38,041 INFO L82 PathProgramCache]: Analyzing trace with hash -455746338, now seen corresponding path program 107 times [2021-05-06 12:06:38,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:38,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155584416] [2021-05-06 12:06:38,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:38,047 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:38,058 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,065 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:38,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:38,074 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:38,086 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,088 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:38,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:38,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:38,116 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:38,126 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,127 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:38,129 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:38,140 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:38,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:38,157 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:38,169 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,171 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:38,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:38,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:38,198 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:38,208 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,209 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:38,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:38,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:38,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:38,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:38,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:38,251 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:38,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:39,032 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:39,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155584416] [2021-05-06 12:06:39,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [155584416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:39,032 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:39,032 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:06:39,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559536413] [2021-05-06 12:06:39,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:06:39,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:39,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:06:39,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=662, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:06:39,033 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 26 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 25 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:40,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:40,414 INFO L93 Difference]: Finished difference Result 994 states and 1153 transitions. [2021-05-06 12:06:40,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:06:40,415 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 25 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:40,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:40,415 INFO L225 Difference]: With dead ends: 994 [2021-05-06 12:06:40,416 INFO L226 Difference]: Without dead ends: 616 [2021-05-06 12:06:40,416 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 28 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 834.7ms TimeCoverageRelationStatistics Valid=117, Invalid=813, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:06:40,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-06 12:06:40,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 478. [2021-05-06 12:06:40,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:40,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:40,775 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:40,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:40,775 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:40,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 25 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:40,775 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:40,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:40,776 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:40,776 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:40,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable542 [2021-05-06 12:06:40,776 INFO L428 AbstractCegarLoop]: === Iteration 123 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:40,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:40,776 INFO L82 PathProgramCache]: Analyzing trace with hash -936826596, now seen corresponding path program 108 times [2021-05-06 12:06:40,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:40,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638905915] [2021-05-06 12:06:40,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:40,782 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:40,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:40,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:40,810 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:40,821 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:40,823 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:40,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:40,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:40,851 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:40,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:40,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:40,864 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:40,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:40,885 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:40,892 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:40,904 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:40,906 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:40,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:40,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:40,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:40,934 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:40,943 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:40,944 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:40,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:40,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:40,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:40,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:40,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:40,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:40,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:41,794 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:41,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638905915] [2021-05-06 12:06:41,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [638905915] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:41,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:41,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:06:41,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41002637] [2021-05-06 12:06:41,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:06:41,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:41,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:06:41,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=710, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:06:41,795 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:43,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:43,148 INFO L93 Difference]: Finished difference Result 985 states and 1144 transitions. [2021-05-06 12:06:43,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:06:43,149 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:43,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:43,150 INFO L225 Difference]: With dead ends: 985 [2021-05-06 12:06:43,150 INFO L226 Difference]: Without dead ends: 607 [2021-05-06 12:06:43,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 27 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 855.3ms TimeCoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:43,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-05-06 12:06:43,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 478. [2021-05-06 12:06:43,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:43,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:43,531 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:43,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:43,532 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:43,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:43,532 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:43,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:43,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:43,532 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:43,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable547 [2021-05-06 12:06:43,532 INFO L428 AbstractCegarLoop]: === Iteration 124 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:43,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:43,532 INFO L82 PathProgramCache]: Analyzing trace with hash -1289914978, now seen corresponding path program 109 times [2021-05-06 12:06:43,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:43,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209716322] [2021-05-06 12:06:43,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:43,538 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:43,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:43,549 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:43,565 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:43,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,578 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:43,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:43,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:43,606 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:43,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:43,618 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:43,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:43,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:43,646 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:43,657 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,660 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:43,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:43,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:43,687 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:43,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,697 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:43,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:43,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:43,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:43,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:43,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:43,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:44,528 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:44,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209716322] [2021-05-06 12:06:44,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1209716322] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:44,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:44,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:06:44,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020938578] [2021-05-06 12:06:44,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:06:44,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:44,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:06:44,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:06:44,529 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 28 states, 28 states have (on average 2.2857142857142856) internal successors, (64), 27 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:45,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:45,881 INFO L93 Difference]: Finished difference Result 976 states and 1135 transitions. [2021-05-06 12:06:45,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:06:45,881 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.2857142857142856) internal successors, (64), 27 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:45,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:45,882 INFO L225 Difference]: With dead ends: 976 [2021-05-06 12:06:45,882 INFO L226 Difference]: Without dead ends: 598 [2021-05-06 12:06:45,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 26 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 839.2ms TimeCoverageRelationStatistics Valid=137, Invalid=919, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:45,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2021-05-06 12:06:46,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 478. [2021-05-06 12:06:46,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:46,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:46,257 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:46,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:46,257 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:46,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.2857142857142856) internal successors, (64), 27 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:46,257 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:46,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:46,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:46,258 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:46,258 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable552 [2021-05-06 12:06:46,258 INFO L428 AbstractCegarLoop]: === Iteration 125 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:46,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:46,258 INFO L82 PathProgramCache]: Analyzing trace with hash 955664476, now seen corresponding path program 110 times [2021-05-06 12:06:46,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:46,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659692670] [2021-05-06 12:06:46,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:46,264 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:46,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:46,274 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:46,290 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:46,302 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:46,304 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:46,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,313 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:46,325 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:46,332 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:46,341 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:46,342 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:46,344 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:46,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:46,355 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:46,370 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:46,382 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:46,384 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:46,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:46,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:46,412 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:46,422 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:46,422 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:46,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:46,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:46,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:46,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:47,242 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:47,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659692670] [2021-05-06 12:06:47,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [659692670] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:47,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:47,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:06:47,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127506694] [2021-05-06 12:06:47,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:06:47,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:47,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:06:47,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=812, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:06:47,244 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:48,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:48,579 INFO L93 Difference]: Finished difference Result 967 states and 1126 transitions. [2021-05-06 12:06:48,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:06:48,579 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:48,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:48,580 INFO L225 Difference]: With dead ends: 967 [2021-05-06 12:06:48,580 INFO L226 Difference]: Without dead ends: 589 [2021-05-06 12:06:48,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 820.8ms TimeCoverageRelationStatistics Valid=147, Invalid=975, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:48,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-05-06 12:06:48,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 478. [2021-05-06 12:06:48,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:48,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:48,950 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:48,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:48,950 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:48,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:48,950 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:48,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:48,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:48,951 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:48,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable557 [2021-05-06 12:06:48,951 INFO L428 AbstractCegarLoop]: === Iteration 126 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:48,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:48,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1379311198, now seen corresponding path program 111 times [2021-05-06 12:06:48,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:48,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842846025] [2021-05-06 12:06:48,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:48,957 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:48,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:48,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:48,983 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:48,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:48,997 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:48,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:49,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:49,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:49,024 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:49,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:49,034 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:49,037 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:49,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:49,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:49,044 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:49,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:49,062 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:49,074 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:49,076 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:49,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:49,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:49,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:49,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:49,104 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:49,114 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:49,115 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:49,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:49,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:49,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:49,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:49,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:49,158 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:49,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:49,997 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:49,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842846025] [2021-05-06 12:06:49,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1842846025] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:49,997 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:49,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:06:49,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036485598] [2021-05-06 12:06:49,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:06:49,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:49,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:06:49,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=866, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:49,998 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:51,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:51,307 INFO L93 Difference]: Finished difference Result 958 states and 1117 transitions. [2021-05-06 12:06:51,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:06:51,307 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:51,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:51,308 INFO L225 Difference]: With dead ends: 958 [2021-05-06 12:06:51,308 INFO L226 Difference]: Without dead ends: 580 [2021-05-06 12:06:51,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 869.4ms TimeCoverageRelationStatistics Valid=157, Invalid=1033, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:51,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-06 12:06:51,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 478. [2021-05-06 12:06:51,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:51,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:51,701 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:51,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:51,701 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:51,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:51,701 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:51,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:51,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:51,702 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:51,702 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable562 [2021-05-06 12:06:51,702 INFO L428 AbstractCegarLoop]: === Iteration 127 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:51,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:51,702 INFO L82 PathProgramCache]: Analyzing trace with hash 349951900, now seen corresponding path program 112 times [2021-05-06 12:06:51,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:51,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628388678] [2021-05-06 12:06:51,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:51,708 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:51,719 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,720 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:51,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:51,736 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:51,748 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:51,750 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:51,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:51,764 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:51,779 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:51,789 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:51,789 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:51,791 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:51,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:51,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:51,820 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:51,833 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:51,835 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:51,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:51,846 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:51,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:51,863 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:51,873 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:51,874 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:51,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:51,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:51,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:51,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:51,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:51,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:51,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:52,691 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:52,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628388678] [2021-05-06 12:06:52,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [628388678] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:52,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:52,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:06:52,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750672211] [2021-05-06 12:06:52,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:06:52,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:52,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:06:52,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=922, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:52,704 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:53,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:53,923 INFO L93 Difference]: Finished difference Result 949 states and 1108 transitions. [2021-05-06 12:06:53,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:06:53,923 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:53,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:53,924 INFO L225 Difference]: With dead ends: 949 [2021-05-06 12:06:53,924 INFO L226 Difference]: Without dead ends: 571 [2021-05-06 12:06:53,924 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 13 SyntacticMatches, 22 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 806.5ms TimeCoverageRelationStatistics Valid=167, Invalid=1093, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:06:53,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-06 12:06:54,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 478. [2021-05-06 12:06:54,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:54,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:54,311 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:54,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:54,311 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:54,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:54,311 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:54,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:54,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:54,311 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:54,311 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable567 [2021-05-06 12:06:54,311 INFO L428 AbstractCegarLoop]: === Iteration 128 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:54,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:54,312 INFO L82 PathProgramCache]: Analyzing trace with hash -494053602, now seen corresponding path program 113 times [2021-05-06 12:06:54,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:54,312 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556018577] [2021-05-06 12:06:54,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:54,318 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:54,329 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:54,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:54,346 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:54,358 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,361 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:54,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:54,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:54,389 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:54,399 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,400 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:54,402 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:54,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:54,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:54,432 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:54,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,446 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:54,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:54,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:54,474 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:54,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,484 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:54,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:54,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:54,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:54,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:54,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:54,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:54,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:55,404 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:55,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556018577] [2021-05-06 12:06:55,404 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1556018577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:55,404 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:55,404 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:06:55,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288627876] [2021-05-06 12:06:55,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:06:55,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:55,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:06:55,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=980, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:55,405 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:56,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:56,655 INFO L93 Difference]: Finished difference Result 940 states and 1099 transitions. [2021-05-06 12:06:56,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:06:56,656 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:56,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:56,657 INFO L225 Difference]: With dead ends: 940 [2021-05-06 12:06:56,657 INFO L226 Difference]: Without dead ends: 562 [2021-05-06 12:06:56,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 925.4ms TimeCoverageRelationStatistics Valid=177, Invalid=1155, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:06:56,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2021-05-06 12:06:57,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 478. [2021-05-06 12:06:57,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:57,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:57,051 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:57,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:57,051 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:57,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:57,051 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:57,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:57,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:57,052 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:57,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable572 [2021-05-06 12:06:57,052 INFO L428 AbstractCegarLoop]: === Iteration 129 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:57,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:57,052 INFO L82 PathProgramCache]: Analyzing trace with hash -219293988, now seen corresponding path program 114 times [2021-05-06 12:06:57,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:57,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737751435] [2021-05-06 12:06:57,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:57,058 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:57,068 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,069 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,076 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:57,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:57,085 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:57,097 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:57,099 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:57,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:57,120 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:57,127 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:57,137 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:57,137 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:57,139 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:57,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:57,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:57,167 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:57,179 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:57,181 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:57,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:57,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:57,210 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:57,220 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:57,220 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:57,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:57,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:57,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:57,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:57,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:57,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:57,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:58,182 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:58,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737751435] [2021-05-06 12:06:58,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [737751435] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:58,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:58,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:06:58,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495824857] [2021-05-06 12:06:58,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:06:58,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:58,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:06:58,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:58,183 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:59,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:59,445 INFO L93 Difference]: Finished difference Result 931 states and 1090 transitions. [2021-05-06 12:06:59,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:06:59,445 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:06:59,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:59,446 INFO L225 Difference]: With dead ends: 931 [2021-05-06 12:06:59,446 INFO L226 Difference]: Without dead ends: 553 [2021-05-06 12:06:59,446 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 811 ImplicationChecksByTransitivity, 951.8ms TimeCoverageRelationStatistics Valid=187, Invalid=1219, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:06:59,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-05-06 12:06:59,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 478. [2021-05-06 12:06:59,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:59,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:06:59,847 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:06:59,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:59,847 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:06:59,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:59,848 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:06:59,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:06:59,848 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:59,848 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:59,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable577 [2021-05-06 12:06:59,848 INFO L428 AbstractCegarLoop]: === Iteration 130 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:59,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:59,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1166909406, now seen corresponding path program 115 times [2021-05-06 12:06:59,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:59,848 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638326829] [2021-05-06 12:06:59,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:59,854 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:59,865 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:59,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:59,881 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:59,899 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:59,901 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:59,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:59,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:59,928 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:59,937 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:59,938 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:59,940 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:59,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,948 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:59,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:59,964 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:59,976 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:59,978 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:59,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,987 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:59,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:59,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:00,007 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:00,019 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:00,020 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:00,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:00,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:00,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:00,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:00,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:00,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:00,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:00,904 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:00,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638326829] [2021-05-06 12:07:00,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [638326829] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:00,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:00,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:07:00,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706963080] [2021-05-06 12:07:00,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:07:00,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:00,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:07:00,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1102, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:07:00,905 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:02,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:02,107 INFO L93 Difference]: Finished difference Result 922 states and 1081 transitions. [2021-05-06 12:07:02,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:07:02,108 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:02,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:02,108 INFO L225 Difference]: With dead ends: 922 [2021-05-06 12:07:02,108 INFO L226 Difference]: Without dead ends: 544 [2021-05-06 12:07:02,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 823 ImplicationChecksByTransitivity, 859.5ms TimeCoverageRelationStatistics Valid=197, Invalid=1285, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:07:02,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-05-06 12:07:02,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 478. [2021-05-06 12:07:02,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:02,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:07:02,505 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:07:02,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:02,505 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:07:02,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:02,506 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:07:02,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:02,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:02,506 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:02,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable582 [2021-05-06 12:07:02,506 INFO L428 AbstractCegarLoop]: === Iteration 131 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:02,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:02,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1228949020, now seen corresponding path program 116 times [2021-05-06 12:07:02,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:02,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792563616] [2021-05-06 12:07:02,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:02,512 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:02,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:02,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:02,539 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:02,550 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:02,552 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:02,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:02,566 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:02,579 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:02,589 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:02,589 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:02,592 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:02,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:02,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:02,618 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:02,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:02,632 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:02,641 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,641 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:02,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:02,660 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:02,670 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:02,671 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:02,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:02,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:02,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:02,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:02,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:02,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:02,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:03,577 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:03,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792563616] [2021-05-06 12:07:03,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1792563616] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:03,577 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:03,577 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:07:03,577 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73896088] [2021-05-06 12:07:03,577 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:07:03,577 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:03,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:07:03,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1166, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:07:03,578 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:05,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:05,041 INFO L93 Difference]: Finished difference Result 913 states and 1072 transitions. [2021-05-06 12:07:05,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:07:05,041 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:05,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:05,042 INFO L225 Difference]: With dead ends: 913 [2021-05-06 12:07:05,042 INFO L226 Difference]: Without dead ends: 535 [2021-05-06 12:07:05,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 826 ImplicationChecksByTransitivity, 908.6ms TimeCoverageRelationStatistics Valid=207, Invalid=1353, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:07:05,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-06 12:07:05,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 478. [2021-05-06 12:07:05,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:05,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:07:05,462 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:07:05,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:05,462 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:07:05,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:05,462 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:07:05,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:05,462 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:05,462 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:05,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable587 [2021-05-06 12:07:05,462 INFO L428 AbstractCegarLoop]: === Iteration 132 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:05,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:05,463 INFO L82 PathProgramCache]: Analyzing trace with hash -576489314, now seen corresponding path program 117 times [2021-05-06 12:07:05,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:05,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137073878] [2021-05-06 12:07:05,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:05,468 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:05,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:05,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:05,495 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:05,507 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:05,509 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:05,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:05,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:05,538 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:05,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:05,549 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:05,551 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:05,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:05,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:05,579 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:05,591 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:05,593 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:05,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:05,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:05,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:05,619 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:05,629 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:05,630 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:05,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:05,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:05,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,743 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:05,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:06,930 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:06,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137073878] [2021-05-06 12:07:06,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2137073878] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:06,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:06,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:07:06,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923532307] [2021-05-06 12:07:06,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:07:06,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:06,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:07:06,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=1578, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:07:06,931 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:08,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:08,309 INFO L93 Difference]: Finished difference Result 927 states and 1082 transitions. [2021-05-06 12:07:08,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:07:08,309 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:08,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:08,310 INFO L225 Difference]: With dead ends: 927 [2021-05-06 12:07:08,310 INFO L226 Difference]: Without dead ends: 549 [2021-05-06 12:07:08,311 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 951 ImplicationChecksByTransitivity, 1323.7ms TimeCoverageRelationStatistics Valid=298, Invalid=1864, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:07:08,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-05-06 12:07:08,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 478. [2021-05-06 12:07:08,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:08,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:07:08,716 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:07:08,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:08,716 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:07:08,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:08,716 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:07:08,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:08,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:08,717 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:08,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable592 [2021-05-06 12:07:08,717 INFO L428 AbstractCegarLoop]: === Iteration 133 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:08,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:08,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1394137764, now seen corresponding path program 118 times [2021-05-06 12:07:08,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:08,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436476248] [2021-05-06 12:07:08,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:08,723 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:08,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:08,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:08,750 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:08,761 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:08,764 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:08,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,774 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:08,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:08,790 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:08,800 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:08,801 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:08,805 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:08,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:08,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:08,834 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:08,846 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:08,848 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:08,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:08,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:08,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:08,877 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:08,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:08,887 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:08,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:08,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:08,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:08,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:08,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:08,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:08,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:09,878 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:09,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436476248] [2021-05-06 12:07:09,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1436476248] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:09,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:09,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:07:09,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324866134] [2021-05-06 12:07:09,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:07:09,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:09,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:07:09,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1300, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:07:09,879 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:11,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:11,446 INFO L93 Difference]: Finished difference Result 895 states and 1054 transitions. [2021-05-06 12:07:11,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:07:11,447 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:11,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:11,447 INFO L225 Difference]: With dead ends: 895 [2021-05-06 12:07:11,447 INFO L226 Difference]: Without dead ends: 517 [2021-05-06 12:07:11,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 13 SyntacticMatches, 16 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 773 ImplicationChecksByTransitivity, 993.0ms TimeCoverageRelationStatistics Valid=227, Invalid=1495, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:07:11,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-05-06 12:07:11,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 478. [2021-05-06 12:07:11,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:11,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:07:11,849 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:07:11,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:11,849 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:07:11,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:11,849 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:07:11,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:11,849 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:11,849 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:11,849 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable597 [2021-05-06 12:07:11,849 INFO L428 AbstractCegarLoop]: === Iteration 134 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:11,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:11,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1312481630, now seen corresponding path program 119 times [2021-05-06 12:07:11,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:11,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462134034] [2021-05-06 12:07:11,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:11,855 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:11,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:11,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:11,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:11,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:11,884 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:11,896 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:11,898 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:11,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:11,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:11,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:11,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:11,927 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:11,937 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:11,937 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:11,940 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:11,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:11,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:11,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:11,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:11,969 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:11,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:11,983 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:11,992 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:11,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,002 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:12,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:12,012 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:12,021 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:12,022 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:12,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:12,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:12,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:12,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:12,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:12,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:12,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:13,026 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:13,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462134034] [2021-05-06 12:07:13,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [462134034] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:13,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:13,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:07:13,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171399400] [2021-05-06 12:07:13,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:07:13,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:13,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:07:13,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1441, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:07:13,027 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:14,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:14,402 INFO L93 Difference]: Finished difference Result 918 states and 1073 transitions. [2021-05-06 12:07:14,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:07:14,402 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:14,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:14,403 INFO L225 Difference]: With dead ends: 918 [2021-05-06 12:07:14,403 INFO L226 Difference]: Without dead ends: 540 [2021-05-06 12:07:14,403 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 16 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 969.6ms TimeCoverageRelationStatistics Valid=236, Invalid=1570, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:07:14,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-05-06 12:07:14,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 478. [2021-05-06 12:07:14,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 463 states have (on average 1.181425485961123) internal successors, (547), 466 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:14,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 564 transitions. [2021-05-06 12:07:14,811 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 564 transitions. Word has length 70 [2021-05-06 12:07:14,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:14,811 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 564 transitions. [2021-05-06 12:07:14,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:14,811 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 564 transitions. [2021-05-06 12:07:14,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:14,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:14,812 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:14,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable602 [2021-05-06 12:07:14,812 INFO L428 AbstractCegarLoop]: === Iteration 135 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:14,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:14,812 INFO L82 PathProgramCache]: Analyzing trace with hash 301364380, now seen corresponding path program 120 times [2021-05-06 12:07:14,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:14,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782366967] [2021-05-06 12:07:14,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:14,816 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:14,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:14,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:14,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:14,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:14,843 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:14,853 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:14,853 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:07:14,856 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:14,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:14,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:14,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:14,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:14,882 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:14,894 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:14,896 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:14,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:14,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:14,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:14,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:14,924 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:14,934 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:14,934 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:14,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:14,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:14,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:14,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:14,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:14,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:14,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:16,007 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:16,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782366967] [2021-05-06 12:07:16,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1782366967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:16,007 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:16,007 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:07:16,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117884062] [2021-05-06 12:07:16,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:07:16,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:16,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:07:16,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1442, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:07:16,008 INFO L87 Difference]: Start difference. First operand 478 states and 564 transitions. Second operand has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:17,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:17,157 INFO L93 Difference]: Finished difference Result 904 states and 1073 transitions. [2021-05-06 12:07:17,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:07:17,157 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:17,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:17,158 INFO L225 Difference]: With dead ends: 904 [2021-05-06 12:07:17,158 INFO L226 Difference]: Without dead ends: 515 [2021-05-06 12:07:17,159 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 15 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 748 ImplicationChecksByTransitivity, 1072.9ms TimeCoverageRelationStatistics Valid=247, Invalid=1645, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:07:17,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-05-06 12:07:17,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 490. [2021-05-06 12:07:17,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 475 states have (on average 1.1852631578947368) internal successors, (563), 478 states have internal predecessors, (563), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:17,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 580 transitions. [2021-05-06 12:07:17,561 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 580 transitions. Word has length 70 [2021-05-06 12:07:17,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:17,561 INFO L480 AbstractCegarLoop]: Abstraction has 490 states and 580 transitions. [2021-05-06 12:07:17,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:17,561 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 580 transitions. [2021-05-06 12:07:17,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:17,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:17,561 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:17,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable606 [2021-05-06 12:07:17,561 INFO L428 AbstractCegarLoop]: === Iteration 136 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:17,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:17,561 INFO L82 PathProgramCache]: Analyzing trace with hash -5032545, now seen corresponding path program 121 times [2021-05-06 12:07:17,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:17,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267314507] [2021-05-06 12:07:17,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:17,567 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:17,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:17,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:17,594 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:17,606 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,608 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:17,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:17,630 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:17,636 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:17,646 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,647 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:17,649 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:17,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,658 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:17,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:17,675 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:17,687 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,689 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:17,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:17,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:17,717 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:17,727 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,728 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:17,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:17,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:17,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:17,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:17,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:17,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:17,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:18,656 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:18,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267314507] [2021-05-06 12:07:18,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [267314507] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:18,657 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:18,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:07:18,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204550417] [2021-05-06 12:07:18,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:07:18,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:18,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:07:18,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:07:18,657 INFO L87 Difference]: Start difference. First operand 490 states and 580 transitions. Second operand has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 25 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:20,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:20,066 INFO L93 Difference]: Finished difference Result 1015 states and 1177 transitions. [2021-05-06 12:07:20,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:07:20,066 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 25 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:20,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:20,067 INFO L225 Difference]: With dead ends: 1015 [2021-05-06 12:07:20,067 INFO L226 Difference]: Without dead ends: 628 [2021-05-06 12:07:20,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 14 SyntacticMatches, 30 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 894.8ms TimeCoverageRelationStatistics Valid=101, Invalid=769, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:07:20,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-05-06 12:07:20,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 499. [2021-05-06 12:07:20,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:20,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:20,519 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:20,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:20,519 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:20,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 25 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:20,519 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:20,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:20,519 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:20,519 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:20,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable611 [2021-05-06 12:07:20,520 INFO L428 AbstractCegarLoop]: === Iteration 137 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:20,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:20,520 INFO L82 PathProgramCache]: Analyzing trace with hash 35642205, now seen corresponding path program 122 times [2021-05-06 12:07:20,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:20,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086931935] [2021-05-06 12:07:20,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:20,525 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:20,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:20,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:20,553 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:20,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,567 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:20,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:20,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:20,595 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:20,605 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,605 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:20,608 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:20,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:20,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:20,635 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:20,646 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,649 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:20,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:20,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:20,675 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:20,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,686 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:20,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:20,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:20,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:20,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:20,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:20,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:20,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:21,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:21,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086931935] [2021-05-06 12:07:21,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086931935] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:21,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:21,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:07:21,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090502758] [2021-05-06 12:07:21,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:07:21,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:21,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:07:21,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:07:21,589 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:23,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:23,208 INFO L93 Difference]: Finished difference Result 1042 states and 1208 transitions. [2021-05-06 12:07:23,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:07:23,208 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:23,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:23,209 INFO L225 Difference]: With dead ends: 1042 [2021-05-06 12:07:23,209 INFO L226 Difference]: Without dead ends: 646 [2021-05-06 12:07:23,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 30 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 910.8ms TimeCoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:07:23,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-06 12:07:23,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 499. [2021-05-06 12:07:23,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:23,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:23,673 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:23,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:23,673 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:23,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:23,673 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:23,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:23,673 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:23,674 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:23,674 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable616 [2021-05-06 12:07:23,674 INFO L428 AbstractCegarLoop]: === Iteration 138 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:23,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:23,674 INFO L82 PathProgramCache]: Analyzing trace with hash 479542879, now seen corresponding path program 123 times [2021-05-06 12:07:23,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:23,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158016721] [2021-05-06 12:07:23,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:23,679 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:23,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,681 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:23,689 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:23,705 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:23,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,719 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:23,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:23,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:23,747 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:23,757 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,757 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:23,759 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:23,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:23,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:23,788 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:23,799 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,802 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:23,802 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:23,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:23,828 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:23,838 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,839 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:23,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:23,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:23,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:23,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:23,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:23,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:23,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:24,707 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:24,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158016721] [2021-05-06 12:07:24,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [158016721] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:24,707 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:24,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:07:24,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73900823] [2021-05-06 12:07:24,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:07:24,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:24,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:07:24,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=765, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:07:24,708 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:26,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:26,268 INFO L93 Difference]: Finished difference Result 1033 states and 1199 transitions. [2021-05-06 12:07:26,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:07:26,269 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:26,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:26,270 INFO L225 Difference]: With dead ends: 1033 [2021-05-06 12:07:26,270 INFO L226 Difference]: Without dead ends: 637 [2021-05-06 12:07:26,270 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 13 SyntacticMatches, 28 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 870.1ms TimeCoverageRelationStatistics Valid=130, Invalid=926, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:07:26,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-05-06 12:07:26,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 499. [2021-05-06 12:07:26,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:26,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:26,758 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:26,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:26,758 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:26,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:26,758 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:26,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:26,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:26,759 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:26,759 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable621 [2021-05-06 12:07:26,759 INFO L428 AbstractCegarLoop]: === Iteration 139 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:26,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:26,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1537379, now seen corresponding path program 124 times [2021-05-06 12:07:26,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:26,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754397831] [2021-05-06 12:07:26,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:26,764 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:26,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:26,775 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:26,792 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:26,803 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,805 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:26,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:26,819 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:26,832 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:26,842 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,842 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:26,845 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:26,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:26,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:26,871 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:26,883 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,885 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:26,886 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:26,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:26,913 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:26,923 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,923 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:26,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:26,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:26,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:26,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:26,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:26,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:26,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:27,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:27,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754397831] [2021-05-06 12:07:27,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1754397831] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:27,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:27,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:07:27,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009337722] [2021-05-06 12:07:27,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:07:27,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:27,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:07:27,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:07:27,854 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 28 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:29,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:29,446 INFO L93 Difference]: Finished difference Result 1024 states and 1190 transitions. [2021-05-06 12:07:29,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:07:29,446 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 28 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:29,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:29,447 INFO L225 Difference]: With dead ends: 1024 [2021-05-06 12:07:29,447 INFO L226 Difference]: Without dead ends: 628 [2021-05-06 12:07:29,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 28 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 936.3ms TimeCoverageRelationStatistics Valid=140, Invalid=982, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:07:29,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-05-06 12:07:30,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 499. [2021-05-06 12:07:30,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:30,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:30,097 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:30,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:30,097 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:30,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 28 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:30,097 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:30,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:30,098 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:30,098 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:30,098 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable626 [2021-05-06 12:07:30,098 INFO L428 AbstractCegarLoop]: === Iteration 140 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:30,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:30,098 INFO L82 PathProgramCache]: Analyzing trace with hash -354625761, now seen corresponding path program 125 times [2021-05-06 12:07:30,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:30,098 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225332456] [2021-05-06 12:07:30,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:30,104 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:30,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:30,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:30,130 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:30,141 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:30,144 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:30,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:30,167 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:30,181 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:30,190 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:30,191 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:30,194 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:30,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:30,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:30,222 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:30,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:30,236 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:30,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:30,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:30,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:30,263 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:30,272 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:30,273 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:30,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:30,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:30,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:30,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:30,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:30,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:30,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:31,085 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:31,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225332456] [2021-05-06 12:07:31,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1225332456] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:31,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:31,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:07:31,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041481942] [2021-05-06 12:07:31,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:07:31,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:31,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:07:31,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=871, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:07:31,086 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:32,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:32,615 INFO L93 Difference]: Finished difference Result 1015 states and 1181 transitions. [2021-05-06 12:07:32,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:07:32,616 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:32,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:32,616 INFO L225 Difference]: With dead ends: 1015 [2021-05-06 12:07:32,616 INFO L226 Difference]: Without dead ends: 619 [2021-05-06 12:07:32,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 27 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 804.5ms TimeCoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:07:32,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2021-05-06 12:07:33,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 499. [2021-05-06 12:07:33,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:33,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:33,100 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:33,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:33,100 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:33,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:33,100 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:33,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:33,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:33,101 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:33,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable631 [2021-05-06 12:07:33,101 INFO L428 AbstractCegarLoop]: === Iteration 141 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:33,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:33,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1890953693, now seen corresponding path program 126 times [2021-05-06 12:07:33,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:33,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145832449] [2021-05-06 12:07:33,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:33,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:33,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:33,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:33,135 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:33,147 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:33,149 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:33,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,158 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:33,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:33,178 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:33,187 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:33,188 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:33,191 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:33,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:33,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:33,219 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:33,230 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:33,232 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:33,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,251 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:33,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:33,261 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:33,271 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:33,271 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:33,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:33,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:33,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:33,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:33,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:33,319 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:33,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:34,141 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:34,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145832449] [2021-05-06 12:07:34,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1145832449] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:34,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:34,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:07:34,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711548236] [2021-05-06 12:07:34,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:07:34,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:34,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:07:34,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:07:34,142 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:35,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:35,711 INFO L93 Difference]: Finished difference Result 1006 states and 1172 transitions. [2021-05-06 12:07:35,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:07:35,712 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:35,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:35,713 INFO L225 Difference]: With dead ends: 1006 [2021-05-06 12:07:35,713 INFO L226 Difference]: Without dead ends: 610 [2021-05-06 12:07:35,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 26 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 846.7ms TimeCoverageRelationStatistics Valid=160, Invalid=1100, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:07:35,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2021-05-06 12:07:36,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 499. [2021-05-06 12:07:36,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:36,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:36,221 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:36,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:36,221 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:36,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:36,221 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:36,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:36,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:36,222 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:36,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable636 [2021-05-06 12:07:36,222 INFO L428 AbstractCegarLoop]: === Iteration 142 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:36,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:36,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1980366881, now seen corresponding path program 127 times [2021-05-06 12:07:36,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:36,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397395133] [2021-05-06 12:07:36,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:36,227 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:36,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,239 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:36,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:36,254 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:36,266 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:36,267 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:36,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:36,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:36,298 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:36,311 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:36,312 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:36,316 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:36,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:36,328 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:36,348 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:36,363 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:36,375 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:36,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,387 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:36,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:36,408 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:36,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:36,420 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:36,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:36,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:36,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:36,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:36,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:36,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:36,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:37,273 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:37,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397395133] [2021-05-06 12:07:37,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [397395133] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:37,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:37,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:07:37,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933429785] [2021-05-06 12:07:37,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:07:37,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:37,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:07:37,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=985, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:07:37,274 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:38,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:38,926 INFO L93 Difference]: Finished difference Result 997 states and 1163 transitions. [2021-05-06 12:07:38,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:07:38,927 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:38,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:38,927 INFO L225 Difference]: With dead ends: 997 [2021-05-06 12:07:38,927 INFO L226 Difference]: Without dead ends: 601 [2021-05-06 12:07:38,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 15 SyntacticMatches, 22 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 760 ImplicationChecksByTransitivity, 858.7ms TimeCoverageRelationStatistics Valid=170, Invalid=1162, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:07:38,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-05-06 12:07:39,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 499. [2021-05-06 12:07:39,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:39,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:39,420 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:39,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:39,420 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:39,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:39,420 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:39,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:39,421 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:39,421 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:39,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable641 [2021-05-06 12:07:39,421 INFO L428 AbstractCegarLoop]: === Iteration 143 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:39,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:39,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1285241117, now seen corresponding path program 128 times [2021-05-06 12:07:39,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:39,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160097102] [2021-05-06 12:07:39,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:39,427 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:39,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:39,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:39,454 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:39,466 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,468 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:39,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:39,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:39,496 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:39,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,506 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:39,521 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:39,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:39,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:39,551 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:39,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,568 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:39,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:39,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:39,597 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:39,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:39,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:39,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:39,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:39,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:39,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:39,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:39,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:40,563 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:40,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160097102] [2021-05-06 12:07:40,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1160097102] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:40,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:40,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:07:40,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884067593] [2021-05-06 12:07:40,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:07:40,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:40,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:07:40,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1045, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:07:40,564 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:42,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:42,015 INFO L93 Difference]: Finished difference Result 988 states and 1154 transitions. [2021-05-06 12:07:42,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:07:42,016 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:42,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:42,016 INFO L225 Difference]: With dead ends: 988 [2021-05-06 12:07:42,016 INFO L226 Difference]: Without dead ends: 592 [2021-05-06 12:07:42,017 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 13 SyntacticMatches, 23 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 956.9ms TimeCoverageRelationStatistics Valid=180, Invalid=1226, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:07:42,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-06 12:07:42,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 499. [2021-05-06 12:07:42,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:42,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:42,527 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:42,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:42,527 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:42,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:42,527 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:42,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:42,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:42,527 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:42,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable646 [2021-05-06 12:07:42,527 INFO L428 AbstractCegarLoop]: === Iteration 144 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:42,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:42,528 INFO L82 PathProgramCache]: Analyzing trace with hash 441235615, now seen corresponding path program 129 times [2021-05-06 12:07:42,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:42,528 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84239589] [2021-05-06 12:07:42,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:42,533 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:42,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:42,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:42,559 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:42,571 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:42,573 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:42,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:42,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:42,600 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:42,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:42,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:42,613 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:42,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,631 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:42,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:42,641 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:42,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:42,655 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:42,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:42,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:42,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:42,684 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:42,693 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:42,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:42,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:42,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:42,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:42,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:42,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:42,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:42,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:43,702 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:43,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84239589] [2021-05-06 12:07:43,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [84239589] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:43,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:43,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:07:43,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346450573] [2021-05-06 12:07:43,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:07:43,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:43,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:07:43,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1107, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:07:43,703 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:45,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:45,258 INFO L93 Difference]: Finished difference Result 979 states and 1145 transitions. [2021-05-06 12:07:45,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:07:45,258 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:45,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:45,259 INFO L225 Difference]: With dead ends: 979 [2021-05-06 12:07:45,259 INFO L226 Difference]: Without dead ends: 583 [2021-05-06 12:07:45,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 23 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 883 ImplicationChecksByTransitivity, 1009.6ms TimeCoverageRelationStatistics Valid=190, Invalid=1292, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:07:45,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-05-06 12:07:45,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 499. [2021-05-06 12:07:45,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:45,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:45,856 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:45,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:45,856 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:45,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:45,856 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:45,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:45,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:45,857 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:45,857 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable651 [2021-05-06 12:07:45,857 INFO L428 AbstractCegarLoop]: === Iteration 145 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:45,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:45,857 INFO L82 PathProgramCache]: Analyzing trace with hash 715995229, now seen corresponding path program 130 times [2021-05-06 12:07:45,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:45,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1768112734] [2021-05-06 12:07:45,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:45,863 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:45,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:45,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:45,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:45,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:45,891 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:45,902 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:45,905 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:45,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:45,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:45,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:45,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:45,934 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:45,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:45,944 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:45,947 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:45,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:45,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:45,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:45,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:45,975 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:45,987 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:45,989 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:45,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:45,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:46,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:46,017 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:46,027 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:46,028 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:46,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:46,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:46,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:46,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:46,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:46,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:46,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:47,059 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:47,059 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1768112734] [2021-05-06 12:07:47,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1768112734] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:47,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:47,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:07:47,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297147965] [2021-05-06 12:07:47,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:07:47,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:47,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:07:47,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:07:47,060 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:48,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:48,516 INFO L93 Difference]: Finished difference Result 970 states and 1136 transitions. [2021-05-06 12:07:48,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:07:48,517 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:48,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:48,517 INFO L225 Difference]: With dead ends: 970 [2021-05-06 12:07:48,517 INFO L226 Difference]: Without dead ends: 574 [2021-05-06 12:07:48,518 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 1036.3ms TimeCoverageRelationStatistics Valid=200, Invalid=1360, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:07:48,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-05-06 12:07:49,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 499. [2021-05-06 12:07:49,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:49,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:49,031 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:49,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:49,031 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:49,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:49,031 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:49,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:49,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:49,031 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:49,031 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable656 [2021-05-06 12:07:49,031 INFO L428 AbstractCegarLoop]: === Iteration 146 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:49,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:49,032 INFO L82 PathProgramCache]: Analyzing trace with hash 2102198623, now seen corresponding path program 131 times [2021-05-06 12:07:49,032 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:49,032 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149924967] [2021-05-06 12:07:49,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:49,037 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:49,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:49,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:49,064 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:49,076 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,078 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:49,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,088 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:49,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:49,106 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:49,116 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,117 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:49,119 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:49,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:49,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:49,145 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:49,157 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,159 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:49,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:49,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:49,187 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:49,197 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,198 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:49,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:49,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:49,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:49,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:49,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:49,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:49,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:50,172 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:50,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149924967] [2021-05-06 12:07:50,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1149924967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:50,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:50,173 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:07:50,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987213495] [2021-05-06 12:07:50,173 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:07:50,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:50,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:07:50,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1237, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:07:50,173 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:51,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:51,514 INFO L93 Difference]: Finished difference Result 961 states and 1127 transitions. [2021-05-06 12:07:51,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:07:51,514 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:51,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:51,515 INFO L225 Difference]: With dead ends: 961 [2021-05-06 12:07:51,515 INFO L226 Difference]: Without dead ends: 565 [2021-05-06 12:07:51,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 854 ImplicationChecksByTransitivity, 977.2ms TimeCoverageRelationStatistics Valid=210, Invalid=1430, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:07:51,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-06 12:07:52,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 499. [2021-05-06 12:07:52,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:52,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:52,042 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:52,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:52,042 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:52,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:52,042 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:52,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:52,043 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:52,043 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:52,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable661 [2021-05-06 12:07:52,043 INFO L428 AbstractCegarLoop]: === Iteration 147 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:52,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:52,043 INFO L82 PathProgramCache]: Analyzing trace with hash -2130729059, now seen corresponding path program 132 times [2021-05-06 12:07:52,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:52,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057598257] [2021-05-06 12:07:52,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:52,049 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:52,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,069 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:52,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:52,078 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:52,090 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,092 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:52,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:52,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:52,122 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:52,131 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,132 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:52,134 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:52,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:52,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:52,162 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:52,173 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,176 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:52,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:52,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:52,205 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:52,214 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,215 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:52,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:52,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:52,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:52,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:52,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:52,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:52,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:53,239 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:53,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057598257] [2021-05-06 12:07:53,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2057598257] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:53,240 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:53,240 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:07:53,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896364] [2021-05-06 12:07:53,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:07:53,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:53,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:07:53,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1305, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:07:53,241 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:54,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:54,684 INFO L93 Difference]: Finished difference Result 963 states and 1132 transitions. [2021-05-06 12:07:54,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:07:54,684 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:54,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:54,685 INFO L225 Difference]: With dead ends: 963 [2021-05-06 12:07:54,685 INFO L226 Difference]: Without dead ends: 567 [2021-05-06 12:07:54,685 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 13 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 1024.9ms TimeCoverageRelationStatistics Valid=220, Invalid=1502, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:07:54,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2021-05-06 12:07:55,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 499. [2021-05-06 12:07:55,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:55,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:55,208 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:55,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:55,209 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:55,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:55,209 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:55,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:55,209 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:55,209 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:55,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable666 [2021-05-06 12:07:55,209 INFO L428 AbstractCegarLoop]: === Iteration 148 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:55,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:55,209 INFO L82 PathProgramCache]: Analyzing trace with hash 358799903, now seen corresponding path program 133 times [2021-05-06 12:07:55,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:55,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1110306318] [2021-05-06 12:07:55,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:55,215 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:55,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:55,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:55,241 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:55,253 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,255 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:55,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,274 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:55,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:55,284 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:55,293 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,294 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:55,296 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:55,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:55,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:55,323 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:55,335 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,337 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:55,338 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:55,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:55,365 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:55,374 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,375 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:55,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:55,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:55,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:55,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:55,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:55,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:55,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:56,390 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:56,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1110306318] [2021-05-06 12:07:56,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1110306318] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:56,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:56,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:07:56,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673847745] [2021-05-06 12:07:56,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:07:56,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:56,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:07:56,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1375, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:07:56,391 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:57,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:57,679 INFO L93 Difference]: Finished difference Result 943 states and 1109 transitions. [2021-05-06 12:07:57,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:07:57,679 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:57,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:57,680 INFO L225 Difference]: With dead ends: 943 [2021-05-06 12:07:57,680 INFO L226 Difference]: Without dead ends: 547 [2021-05-06 12:07:57,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 13 SyntacticMatches, 18 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 1011.8ms TimeCoverageRelationStatistics Valid=230, Invalid=1576, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:07:57,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-05-06 12:07:58,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 499. [2021-05-06 12:07:58,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:58,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:07:58,197 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:07:58,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:58,197 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:07:58,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:58,198 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:07:58,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:58,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:58,198 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:58,198 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable671 [2021-05-06 12:07:58,198 INFO L428 AbstractCegarLoop]: === Iteration 149 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:58,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:58,198 INFO L82 PathProgramCache]: Analyzing trace with hash -458848547, now seen corresponding path program 134 times [2021-05-06 12:07:58,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:58,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804482004] [2021-05-06 12:07:58,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:58,204 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:58,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:58,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:58,232 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:58,244 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,246 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:58,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:58,268 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:58,275 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:58,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:58,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:58,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:58,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:58,316 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:58,327 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,330 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:58,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:58,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:58,359 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:58,369 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,370 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:58,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:58,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:58,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:58,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:58,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:58,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:58,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:59,479 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:59,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804482004] [2021-05-06 12:07:59,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1804482004] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:59,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:59,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:07:59,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90547118] [2021-05-06 12:07:59,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:07:59,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:59,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:07:59,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1447, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:07:59,480 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:00,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:00,806 INFO L93 Difference]: Finished difference Result 934 states and 1100 transitions. [2021-05-06 12:08:00,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:08:00,806 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:00,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:00,807 INFO L225 Difference]: With dead ends: 934 [2021-05-06 12:08:00,807 INFO L226 Difference]: Without dead ends: 538 [2021-05-06 12:08:00,808 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 18 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 883 ImplicationChecksByTransitivity, 1109.2ms TimeCoverageRelationStatistics Valid=240, Invalid=1652, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:08:00,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-05-06 12:08:01,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 499. [2021-05-06 12:08:01,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:01,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:08:01,341 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:08:01,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:01,341 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:08:01,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:01,341 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:08:01,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:01,341 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:01,342 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:01,342 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable676 [2021-05-06 12:08:01,342 INFO L428 AbstractCegarLoop]: === Iteration 150 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:01,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:01,342 INFO L82 PathProgramCache]: Analyzing trace with hash -2047196449, now seen corresponding path program 135 times [2021-05-06 12:08:01,342 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:01,342 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917115948] [2021-05-06 12:08:01,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:01,347 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:01,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:01,367 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:01,375 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:01,386 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,389 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:01,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:01,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:01,415 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:01,425 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,426 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:01,428 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:01,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,440 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:01,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:01,455 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:01,467 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,469 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:01,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:01,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:01,498 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:01,507 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,508 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:01,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:01,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:01,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:01,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:01,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:01,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:01,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:02,637 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:02,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917115948] [2021-05-06 12:08:02,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [917115948] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:02,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:02,637 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:08:02,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668287463] [2021-05-06 12:08:02,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:08:02,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:02,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:08:02,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1521, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:08:02,638 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 40 states, 40 states have (on average 1.675) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:04,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:04,207 INFO L93 Difference]: Finished difference Result 929 states and 1095 transitions. [2021-05-06 12:08:04,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:08:04,208 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:04,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:04,208 INFO L225 Difference]: With dead ends: 929 [2021-05-06 12:08:04,209 INFO L226 Difference]: Without dead ends: 533 [2021-05-06 12:08:04,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 17 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 856 ImplicationChecksByTransitivity, 1129.3ms TimeCoverageRelationStatistics Valid=250, Invalid=1730, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:08:04,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2021-05-06 12:08:04,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 499. [2021-05-06 12:08:04,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 484 states have (on average 1.1818181818181819) internal successors, (572), 487 states have internal predecessors, (572), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:04,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 589 transitions. [2021-05-06 12:08:04,899 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 589 transitions. Word has length 73 [2021-05-06 12:08:04,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:04,899 INFO L480 AbstractCegarLoop]: Abstraction has 499 states and 589 transitions. [2021-05-06 12:08:04,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:04,899 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 589 transitions. [2021-05-06 12:08:04,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:04,900 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:04,900 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:04,900 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable681 [2021-05-06 12:08:04,900 INFO L428 AbstractCegarLoop]: === Iteration 151 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:04,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:04,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1236653597, now seen corresponding path program 136 times [2021-05-06 12:08:04,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:04,900 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327536531] [2021-05-06 12:08:04,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:04,905 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:04,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:04,928 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:04,936 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:04,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,946 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:08:04,949 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:04,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:04,971 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:04,979 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:04,991 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,994 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:05,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:05,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:05,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:05,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:05,025 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:05,035 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:05,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:05,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:05,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:05,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:05,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:05,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:05,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:05,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:06,126 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:06,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327536531] [2021-05-06 12:08:06,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [327536531] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:06,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:06,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:08:06,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819179317] [2021-05-06 12:08:06,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:08:06,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:06,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:08:06,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1597, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:08:06,127 INFO L87 Difference]: Start difference. First operand 499 states and 589 transitions. Second operand has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:07,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:07,356 INFO L93 Difference]: Finished difference Result 943 states and 1119 transitions. [2021-05-06 12:08:07,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:08:07,357 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:07,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:07,357 INFO L225 Difference]: With dead ends: 943 [2021-05-06 12:08:07,358 INFO L226 Difference]: Without dead ends: 536 [2021-05-06 12:08:07,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 16 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 1059.6ms TimeCoverageRelationStatistics Valid=260, Invalid=1810, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:08:07,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2021-05-06 12:08:08,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 511. [2021-05-06 12:08:08,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 496 states have (on average 1.185483870967742) internal successors, (588), 499 states have internal predecessors, (588), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:08,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 605 transitions. [2021-05-06 12:08:08,049 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 605 transitions. Word has length 73 [2021-05-06 12:08:08,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:08,049 INFO L480 AbstractCegarLoop]: Abstraction has 511 states and 605 transitions. [2021-05-06 12:08:08,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:08,049 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 605 transitions. [2021-05-06 12:08:08,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 12:08:08,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:08,049 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:08,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable685 [2021-05-06 12:08:08,050 INFO L428 AbstractCegarLoop]: === Iteration 152 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:08,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:08,050 INFO L82 PathProgramCache]: Analyzing trace with hash -482247245, now seen corresponding path program 7 times [2021-05-06 12:08:08,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:08,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [773278703] [2021-05-06 12:08:08,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:08,060 WARN L240 tifierPushTermWalker]: treesize reduction 56, result has 57.9 percent of original size [2021-05-06 12:08:08,097 WARN L245 tifierPushTermWalker]: treesize reduction 56, result has 57.9 percent of original size 77 [2021-05-06 12:08:08,123 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:08,136 WARN L240 tifierPushTermWalker]: treesize reduction 123, result has 14.0 percent of original size [2021-05-06 12:08:08,146 WARN L245 tifierPushTermWalker]: treesize reduction 123, result has 14.0 percent of original size 20 [2021-05-06 12:08:08,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:08,153 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:08,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:08,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:08,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:08,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:08,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:08,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:08,439 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:08,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [773278703] [2021-05-06 12:08:08,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [773278703] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:08,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:08,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:08:08,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923584341] [2021-05-06 12:08:08,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:08:08,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:08,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:08:08,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:08:08,440 INFO L87 Difference]: Start difference. First operand 511 states and 605 transitions. Second operand has 21 states, 21 states have (on average 2.9523809523809526) internal successors, (62), 20 states have internal predecessors, (62), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:08:09,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:09,257 INFO L93 Difference]: Finished difference Result 945 states and 1115 transitions. [2021-05-06 12:08:09,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:08:09,257 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.9523809523809526) internal successors, (62), 20 states have internal predecessors, (62), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 75 [2021-05-06 12:08:09,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:09,258 INFO L225 Difference]: With dead ends: 945 [2021-05-06 12:08:09,258 INFO L226 Difference]: Without dead ends: 531 [2021-05-06 12:08:09,258 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 24 SyntacticMatches, 14 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 351.6ms TimeCoverageRelationStatistics Valid=244, Invalid=568, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:08:09,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2021-05-06 12:08:09,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 523. [2021-05-06 12:08:09,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 523 states, 508 states have (on average 1.1811023622047243) internal successors, (600), 511 states have internal predecessors, (600), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:09,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 617 transitions. [2021-05-06 12:08:09,778 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 617 transitions. Word has length 75 [2021-05-06 12:08:09,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:09,778 INFO L480 AbstractCegarLoop]: Abstraction has 523 states and 617 transitions. [2021-05-06 12:08:09,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.9523809523809526) internal successors, (62), 20 states have internal predecessors, (62), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:08:09,778 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 617 transitions. [2021-05-06 12:08:09,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:09,778 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:09,778 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:09,778 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable686 [2021-05-06 12:08:09,779 INFO L428 AbstractCegarLoop]: === Iteration 153 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:09,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:09,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1182482172, now seen corresponding path program 137 times [2021-05-06 12:08:09,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:09,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110030231] [2021-05-06 12:08:09,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:09,784 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:09,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:09,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:09,816 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:09,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:09,830 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:09,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:09,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:09,859 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:09,869 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:09,870 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:09,872 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:09,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,884 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:09,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:09,901 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:09,913 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:09,915 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:09,924 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:09,934 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:09,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:09,944 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:09,954 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:09,955 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:09,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:09,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:09,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:09,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:09,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:09,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:10,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:10,818 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:10,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110030231] [2021-05-06 12:08:10,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2110030231] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:10,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:10,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:08:10,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291482944] [2021-05-06 12:08:10,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:08:10,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:10,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:08:10,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=720, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:08:10,819 INFO L87 Difference]: Start difference. First operand 523 states and 617 transitions. Second operand has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 26 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:12,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:12,806 INFO L93 Difference]: Finished difference Result 1093 states and 1266 transitions. [2021-05-06 12:08:12,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:08:12,807 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 26 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:12,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:12,807 INFO L225 Difference]: With dead ends: 1093 [2021-05-06 12:08:12,807 INFO L226 Difference]: Without dead ends: 679 [2021-05-06 12:08:12,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 20 SyntacticMatches, 25 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 872.1ms TimeCoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:08:12,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-06 12:08:13,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 532. [2021-05-06 12:08:13,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:13,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:13,372 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:13,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:13,373 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:13,373 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 26 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:13,373 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:13,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:13,373 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:13,373 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:13,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable691 [2021-05-06 12:08:13,373 INFO L428 AbstractCegarLoop]: === Iteration 154 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:13,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:13,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1743181950, now seen corresponding path program 138 times [2021-05-06 12:08:13,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:13,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254180078] [2021-05-06 12:08:13,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:13,379 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:13,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:13,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:13,408 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:13,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,422 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:13,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,423 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:13,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:13,449 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:13,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,459 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:13,462 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:13,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:13,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:13,490 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:13,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,504 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:13,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:13,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:13,531 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:13,541 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,542 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:13,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:13,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:13,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:13,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:13,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:13,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:13,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:14,523 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:14,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254180078] [2021-05-06 12:08:14,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [254180078] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:14,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:14,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:08:14,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556116332] [2021-05-06 12:08:14,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:08:14,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:14,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:08:14,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=770, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:08:14,524 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:16,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:16,482 INFO L93 Difference]: Finished difference Result 1111 states and 1284 transitions. [2021-05-06 12:08:16,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:08:16,483 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:16,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:16,483 INFO L225 Difference]: With dead ends: 1111 [2021-05-06 12:08:16,484 INFO L226 Difference]: Without dead ends: 688 [2021-05-06 12:08:16,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 32 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 990.5ms TimeCoverageRelationStatistics Valid=123, Invalid=933, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:08:16,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2021-05-06 12:08:17,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 532. [2021-05-06 12:08:17,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:17,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:17,113 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:17,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:17,113 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:17,113 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:17,113 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:17,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:17,114 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:17,114 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:17,114 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable696 [2021-05-06 12:08:17,114 INFO L428 AbstractCegarLoop]: === Iteration 155 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:17,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:17,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1783856700, now seen corresponding path program 139 times [2021-05-06 12:08:17,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:17,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933737602] [2021-05-06 12:08:17,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:17,120 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:17,131 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,132 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,139 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:17,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:17,148 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:17,160 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:17,162 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:17,171 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:17,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:17,191 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:17,201 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:17,201 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:17,204 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:17,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:17,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:17,230 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:17,241 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:17,243 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:17,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:17,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:17,272 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:17,281 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:17,282 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:17,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:17,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:17,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:17,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:17,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:17,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:17,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:18,244 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:18,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933737602] [2021-05-06 12:08:18,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1933737602] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:18,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:18,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:08:18,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476345243] [2021-05-06 12:08:18,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:08:18,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:18,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:08:18,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=822, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:08:18,245 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 29 states, 29 states have (on average 2.413793103448276) internal successors, (70), 28 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:20,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:20,240 INFO L93 Difference]: Finished difference Result 1102 states and 1275 transitions. [2021-05-06 12:08:20,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:08:20,240 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.413793103448276) internal successors, (70), 28 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:20,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:20,241 INFO L225 Difference]: With dead ends: 1102 [2021-05-06 12:08:20,241 INFO L226 Difference]: Without dead ends: 679 [2021-05-06 12:08:20,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 31 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 970.2ms TimeCoverageRelationStatistics Valid=133, Invalid=989, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:08:20,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-06 12:08:20,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 532. [2021-05-06 12:08:20,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:20,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:20,860 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:20,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:20,861 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:20,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.413793103448276) internal successors, (70), 28 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:20,861 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:20,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:20,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:20,861 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:20,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable701 [2021-05-06 12:08:20,861 INFO L428 AbstractCegarLoop]: === Iteration 156 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:20,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:20,861 INFO L82 PathProgramCache]: Analyzing trace with hash -2067209922, now seen corresponding path program 140 times [2021-05-06 12:08:20,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:20,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545446393] [2021-05-06 12:08:20,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:20,867 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:20,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:20,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:20,893 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:20,905 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:20,907 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:20,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:20,929 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:20,936 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:20,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:20,946 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:20,949 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:20,960 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:20,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:20,977 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:20,988 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:20,991 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:20,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,992 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:21,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:21,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:21,019 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:21,029 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:21,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:21,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:21,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:21,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:21,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:21,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:21,083 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:21,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:22,006 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:22,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545446393] [2021-05-06 12:08:22,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1545446393] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:22,007 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:22,007 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:08:22,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756345742] [2021-05-06 12:08:22,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:08:22,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:22,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:08:22,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=876, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:08:22,007 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 29 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:23,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:23,810 INFO L93 Difference]: Finished difference Result 1093 states and 1266 transitions. [2021-05-06 12:08:23,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:08:23,811 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 29 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:23,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:23,812 INFO L225 Difference]: With dead ends: 1093 [2021-05-06 12:08:23,812 INFO L226 Difference]: Without dead ends: 670 [2021-05-06 12:08:23,813 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 13 SyntacticMatches, 29 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 954.0ms TimeCoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:08:23,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2021-05-06 12:08:24,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 532. [2021-05-06 12:08:24,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:24,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:24,445 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:24,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:24,445 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:24,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 29 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:24,445 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:24,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:24,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:24,445 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:24,445 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable706 [2021-05-06 12:08:24,445 INFO L428 AbstractCegarLoop]: === Iteration 157 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:24,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:24,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1746677116, now seen corresponding path program 141 times [2021-05-06 12:08:24,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:24,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428332103] [2021-05-06 12:08:24,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:24,451 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:24,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:24,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:24,489 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:24,504 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:24,507 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:24,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:24,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:24,535 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:24,545 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:24,545 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:24,547 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:24,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:24,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:24,574 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:24,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:24,590 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:24,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:24,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:24,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:24,629 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:24,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:24,642 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:24,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:24,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:24,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:24,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:24,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:24,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:24,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:25,688 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:25,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428332103] [2021-05-06 12:08:25,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [428332103] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:25,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:25,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:08:25,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526655750] [2021-05-06 12:08:25,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:08:25,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:25,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:08:25,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=932, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:08:25,690 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:27,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:27,781 INFO L93 Difference]: Finished difference Result 1084 states and 1257 transitions. [2021-05-06 12:08:27,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:08:27,782 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:27,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:27,782 INFO L225 Difference]: With dead ends: 1084 [2021-05-06 12:08:27,782 INFO L226 Difference]: Without dead ends: 661 [2021-05-06 12:08:27,783 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 29 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 1045.7ms TimeCoverageRelationStatistics Valid=153, Invalid=1107, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:08:27,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-06 12:08:28,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 532. [2021-05-06 12:08:28,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:28,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:28,437 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:28,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:28,438 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:28,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:28,438 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:28,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:28,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:28,438 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:28,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable711 [2021-05-06 12:08:28,438 INFO L428 AbstractCegarLoop]: === Iteration 158 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:28,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:28,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1393588734, now seen corresponding path program 142 times [2021-05-06 12:08:28,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:28,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423633904] [2021-05-06 12:08:28,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:28,444 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:28,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,451 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:28,453 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:28,469 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:28,480 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,482 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:28,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,492 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:28,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:28,508 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:28,517 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,518 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:28,520 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:28,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:28,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:28,546 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:28,557 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,559 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:28,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:28,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:28,585 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:28,595 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,595 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:28,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:28,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:28,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:28,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:28,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:28,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:28,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:29,559 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:29,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423633904] [2021-05-06 12:08:29,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [423633904] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:29,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:29,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:08:29,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691288916] [2021-05-06 12:08:29,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:08:29,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:29,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:08:29,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=990, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:08:29,560 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 32 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:31,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:31,793 INFO L93 Difference]: Finished difference Result 1075 states and 1248 transitions. [2021-05-06 12:08:31,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:08:31,794 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:31,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:31,795 INFO L225 Difference]: With dead ends: 1075 [2021-05-06 12:08:31,795 INFO L226 Difference]: Without dead ends: 652 [2021-05-06 12:08:31,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 13 SyntacticMatches, 27 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 811 ImplicationChecksByTransitivity, 976.0ms TimeCoverageRelationStatistics Valid=163, Invalid=1169, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:08:31,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-06 12:08:32,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 532. [2021-05-06 12:08:32,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:32,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:32,690 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:32,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:32,690 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:32,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:32,690 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:32,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:32,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:32,690 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:32,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable716 [2021-05-06 12:08:32,690 INFO L428 AbstractCegarLoop]: === Iteration 159 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:32,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:32,691 INFO L82 PathProgramCache]: Analyzing trace with hash -655799108, now seen corresponding path program 143 times [2021-05-06 12:08:32,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:32,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029900879] [2021-05-06 12:08:32,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:32,696 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:32,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:32,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:32,723 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:32,734 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:32,737 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:32,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:32,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:32,771 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:32,783 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:32,783 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:32,786 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:32,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:32,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:32,818 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:32,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:32,834 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:32,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:32,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:32,864 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:32,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:32,876 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:32,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:32,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:32,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:32,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:32,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:32,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:32,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:33,867 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:33,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029900879] [2021-05-06 12:08:33,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2029900879] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:33,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:33,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:08:33,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387302546] [2021-05-06 12:08:33,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:08:33,868 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:33,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:08:33,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:08:33,868 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:35,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:35,658 INFO L93 Difference]: Finished difference Result 1066 states and 1239 transitions. [2021-05-06 12:08:35,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:08:35,659 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:35,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:35,659 INFO L225 Difference]: With dead ends: 1066 [2021-05-06 12:08:35,659 INFO L226 Difference]: Without dead ends: 643 [2021-05-06 12:08:35,661 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 13 SyntacticMatches, 26 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 983.5ms TimeCoverageRelationStatistics Valid=173, Invalid=1233, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:08:35,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-06 12:08:36,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 532. [2021-05-06 12:08:36,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:36,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:36,333 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:36,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:36,333 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:36,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:36,333 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:36,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:36,333 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:36,333 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:36,333 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable721 [2021-05-06 12:08:36,334 INFO L428 AbstractCegarLoop]: === Iteration 160 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:36,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:36,334 INFO L82 PathProgramCache]: Analyzing trace with hash -232152386, now seen corresponding path program 144 times [2021-05-06 12:08:36,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:36,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321267701] [2021-05-06 12:08:36,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:36,344 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:36,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,376 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:36,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:36,385 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:36,397 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,399 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:36,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:36,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:36,426 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:36,435 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,436 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:36,438 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:36,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:36,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:36,466 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:36,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,480 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:36,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:36,501 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:36,508 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:36,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,518 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:36,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:36,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:36,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:36,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:36,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:36,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:36,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:37,556 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:37,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321267701] [2021-05-06 12:08:37,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1321267701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:37,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:37,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:08:37,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799050143] [2021-05-06 12:08:37,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:08:37,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:37,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:08:37,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1175, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:08:37,557 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:40,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:40,016 INFO L93 Difference]: Finished difference Result 1066 states and 1235 transitions. [2021-05-06 12:08:40,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:08:40,017 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:40,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:40,017 INFO L225 Difference]: With dead ends: 1066 [2021-05-06 12:08:40,017 INFO L226 Difference]: Without dead ends: 643 [2021-05-06 12:08:40,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 26 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 963 ImplicationChecksByTransitivity, 1013.1ms TimeCoverageRelationStatistics Valid=182, Invalid=1300, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:08:40,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-06 12:08:40,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 532. [2021-05-06 12:08:40,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:40,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:40,834 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:40,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:40,835 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:40,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:40,835 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:40,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:40,835 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:40,835 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:40,835 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable726 [2021-05-06 12:08:40,835 INFO L428 AbstractCegarLoop]: === Iteration 161 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:40,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:40,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1261511684, now seen corresponding path program 145 times [2021-05-06 12:08:40,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:40,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012562272] [2021-05-06 12:08:40,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:40,841 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:40,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:40,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:40,869 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:40,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:40,882 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:40,891 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,901 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:40,903 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:40,910 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:40,920 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:40,921 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:40,923 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:40,924 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:40,936 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:40,955 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:40,969 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:40,972 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:40,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,974 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:40,984 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:40,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:41,006 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:41,017 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:41,018 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:41,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:41,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:41,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:41,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:41,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:41,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:41,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:42,114 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:42,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012562272] [2021-05-06 12:08:42,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2012562272] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:42,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:42,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:08:42,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728735976] [2021-05-06 12:08:42,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:08:42,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:42,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:08:42,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1176, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:08:42,115 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:43,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:43,919 INFO L93 Difference]: Finished difference Result 1048 states and 1221 transitions. [2021-05-06 12:08:43,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:08:43,919 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:43,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:43,920 INFO L225 Difference]: With dead ends: 1048 [2021-05-06 12:08:43,920 INFO L226 Difference]: Without dead ends: 625 [2021-05-06 12:08:43,920 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 25 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 955 ImplicationChecksByTransitivity, 1094.4ms TimeCoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:08:43,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-06 12:08:44,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 532. [2021-05-06 12:08:44,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:44,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:44,580 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:44,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:44,580 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:44,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:44,580 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:44,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:44,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:44,580 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:44,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable731 [2021-05-06 12:08:44,580 INFO L428 AbstractCegarLoop]: === Iteration 162 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:44,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:44,581 INFO L82 PathProgramCache]: Analyzing trace with hash -2105517186, now seen corresponding path program 146 times [2021-05-06 12:08:44,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:44,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777376985] [2021-05-06 12:08:44,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:44,586 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:44,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:44,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:44,615 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:44,627 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:44,629 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:44,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,631 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:44,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:44,657 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:44,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:44,668 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:44,670 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:44,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:44,680 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:44,697 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:44,709 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:44,712 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:44,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:44,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:44,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:44,740 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:44,750 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:44,751 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:44,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:44,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:44,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:44,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:44,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:44,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:44,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:45,824 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:45,825 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777376985] [2021-05-06 12:08:45,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [777376985] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:45,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:45,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:08:45,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786686284] [2021-05-06 12:08:45,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:08:45,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:45,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:08:45,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1242, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:08:45,826 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:47,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:47,792 INFO L93 Difference]: Finished difference Result 1039 states and 1212 transitions. [2021-05-06 12:08:47,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:08:47,792 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:47,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:47,793 INFO L225 Difference]: With dead ends: 1039 [2021-05-06 12:08:47,793 INFO L226 Difference]: Without dead ends: 616 [2021-05-06 12:08:47,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1062.2ms TimeCoverageRelationStatistics Valid=203, Invalid=1437, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:08:47,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-06 12:08:48,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 532. [2021-05-06 12:08:48,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:48,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:48,446 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:48,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:48,447 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:48,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:48,447 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:48,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:48,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:48,447 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:48,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable736 [2021-05-06 12:08:48,447 INFO L428 AbstractCegarLoop]: === Iteration 163 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:48,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:48,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1830757572, now seen corresponding path program 147 times [2021-05-06 12:08:48,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:48,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262302068] [2021-05-06 12:08:48,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:48,453 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:48,454 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:48,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:48,482 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:48,493 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:48,496 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:48,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:48,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:48,524 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:48,534 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:48,535 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:48,537 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:48,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:48,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:48,563 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:48,575 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:48,577 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:48,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:48,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:48,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:48,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:48,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:48,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:48,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:48,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:48,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:48,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:48,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:48,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:48,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:49,683 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:49,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262302068] [2021-05-06 12:08:49,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1262302068] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:49,683 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:49,683 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:08:49,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017984216] [2021-05-06 12:08:49,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:08:49,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:49,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:08:49,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1310, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:08:49,684 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:51,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:51,615 INFO L93 Difference]: Finished difference Result 1030 states and 1203 transitions. [2021-05-06 12:08:51,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:08:51,616 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:51,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:51,616 INFO L225 Difference]: With dead ends: 1030 [2021-05-06 12:08:51,616 INFO L226 Difference]: Without dead ends: 607 [2021-05-06 12:08:51,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 13 SyntacticMatches, 22 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 966 ImplicationChecksByTransitivity, 1068.0ms TimeCoverageRelationStatistics Valid=213, Invalid=1509, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:08:51,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-05-06 12:08:52,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 532. [2021-05-06 12:08:52,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:52,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:52,271 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:52,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:52,271 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:52,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:52,271 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:52,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:52,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:52,272 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:52,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable741 [2021-05-06 12:08:52,272 INFO L428 AbstractCegarLoop]: === Iteration 164 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:52,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:52,272 INFO L82 PathProgramCache]: Analyzing trace with hash -444554178, now seen corresponding path program 148 times [2021-05-06 12:08:52,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:52,272 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606946650] [2021-05-06 12:08:52,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:52,277 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:52,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:52,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:52,306 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:52,320 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,323 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:52,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,324 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:52,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:52,356 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:52,368 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,369 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:52,371 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:52,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:52,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:52,400 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:52,413 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,415 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:52,416 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:52,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:52,443 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:52,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,454 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:52,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:52,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:52,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:52,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:52,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:52,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:52,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:53,551 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:53,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606946650] [2021-05-06 12:08:53,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1606946650] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:53,552 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:53,552 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:08:53,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977321077] [2021-05-06 12:08:53,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:08:53,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:53,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:08:53,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1380, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:08:53,552 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:55,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:55,158 INFO L93 Difference]: Finished difference Result 1021 states and 1194 transitions. [2021-05-06 12:08:55,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:08:55,159 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:55,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:55,159 INFO L225 Difference]: With dead ends: 1021 [2021-05-06 12:08:55,159 INFO L226 Difference]: Without dead ends: 598 [2021-05-06 12:08:55,160 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 1089.2ms TimeCoverageRelationStatistics Valid=223, Invalid=1583, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:08:55,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2021-05-06 12:08:55,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 532. [2021-05-06 12:08:55,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:55,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:55,857 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:55,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:55,857 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:55,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:55,858 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:55,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:55,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:55,858 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:55,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable746 [2021-05-06 12:08:55,858 INFO L428 AbstractCegarLoop]: === Iteration 165 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:55,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:55,858 INFO L82 PathProgramCache]: Analyzing trace with hash -382514564, now seen corresponding path program 149 times [2021-05-06 12:08:55,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:55,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051042052] [2021-05-06 12:08:55,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:55,864 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:55,865 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:55,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:55,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:55,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:55,892 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:55,903 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:55,906 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:55,906 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:55,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:55,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:55,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:55,935 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:55,945 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:55,946 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:55,948 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:55,960 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:55,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:55,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:55,970 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:55,978 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:55,990 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:55,992 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:56,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,012 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:56,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:56,023 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:56,032 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:56,033 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:56,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:56,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:56,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:56,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:56,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:56,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:56,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:57,088 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:57,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051042052] [2021-05-06 12:08:57,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1051042052] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:57,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:57,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:08:57,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051247356] [2021-05-06 12:08:57,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:08:57,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:57,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:08:57,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1452, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:08:57,089 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:58,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:58,814 INFO L93 Difference]: Finished difference Result 1012 states and 1185 transitions. [2021-05-06 12:08:58,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:08:58,815 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:58,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:58,815 INFO L225 Difference]: With dead ends: 1012 [2021-05-06 12:08:58,816 INFO L226 Difference]: Without dead ends: 589 [2021-05-06 12:08:58,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 997 ImplicationChecksByTransitivity, 1051.3ms TimeCoverageRelationStatistics Valid=233, Invalid=1659, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:08:58,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-05-06 12:08:59,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 532. [2021-05-06 12:08:59,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:59,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:08:59,472 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:08:59,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:59,473 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:08:59,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:59,473 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:08:59,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:59,473 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:59,473 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:59,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable751 [2021-05-06 12:08:59,473 INFO L428 AbstractCegarLoop]: === Iteration 166 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:59,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:59,473 INFO L82 PathProgramCache]: Analyzing trace with hash 2107014398, now seen corresponding path program 150 times [2021-05-06 12:08:59,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:59,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666694464] [2021-05-06 12:08:59,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:59,479 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:59,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:59,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:59,506 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:59,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,520 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:59,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:59,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:59,549 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:59,559 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,559 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:59,562 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:59,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:59,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:59,589 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:59,600 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,603 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:59,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,613 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:59,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:59,631 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:59,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,642 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:59,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:59,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:59,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:59,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:59,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:59,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:59,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:00,742 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:00,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666694464] [2021-05-06 12:09:00,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [666694464] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:00,743 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:00,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:09:00,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512553865] [2021-05-06 12:09:00,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:09:00,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:00,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:09:00,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1526, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:09:00,743 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:02,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:02,770 INFO L93 Difference]: Finished difference Result 1003 states and 1176 transitions. [2021-05-06 12:09:02,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:09:02,771 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:02,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:02,771 INFO L225 Difference]: With dead ends: 1003 [2021-05-06 12:09:02,771 INFO L226 Difference]: Without dead ends: 580 [2021-05-06 12:09:02,772 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 13 SyntacticMatches, 19 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 951 ImplicationChecksByTransitivity, 1095.7ms TimeCoverageRelationStatistics Valid=243, Invalid=1737, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:09:02,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-06 12:09:03,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 532. [2021-05-06 12:09:03,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:03,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:09:03,429 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:09:03,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:03,429 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:09:03,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:03,429 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:09:03,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:03,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:03,430 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:03,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable756 [2021-05-06 12:09:03,430 INFO L428 AbstractCegarLoop]: === Iteration 167 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:03,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:03,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1289365948, now seen corresponding path program 151 times [2021-05-06 12:09:03,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:03,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585196212] [2021-05-06 12:09:03,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:03,448 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:03,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:03,474 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:03,505 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:03,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,521 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:03,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:03,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:03,551 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:03,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,563 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:03,565 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:03,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:03,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:03,596 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:03,608 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,611 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:03,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,612 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:03,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:03,639 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:03,649 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,650 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:03,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:03,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:03,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:03,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:03,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:03,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:03,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:04,688 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:04,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585196212] [2021-05-06 12:09:04,688 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [585196212] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:04,688 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:04,688 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:09:04,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734101638] [2021-05-06 12:09:04,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:09:04,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:04,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:09:04,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1602, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:09:04,689 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:06,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:06,378 INFO L93 Difference]: Finished difference Result 994 states and 1167 transitions. [2021-05-06 12:09:06,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:09:06,378 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:06,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:06,379 INFO L225 Difference]: With dead ends: 994 [2021-05-06 12:09:06,379 INFO L226 Difference]: Without dead ends: 571 [2021-05-06 12:09:06,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 964 ImplicationChecksByTransitivity, 1041.9ms TimeCoverageRelationStatistics Valid=253, Invalid=1817, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:09:06,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-06 12:09:07,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 532. [2021-05-06 12:09:07,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:07,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:09:07,072 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:09:07,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:07,072 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:09:07,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:07,072 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:09:07,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:07,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:07,073 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:07,073 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable761 [2021-05-06 12:09:07,073 INFO L428 AbstractCegarLoop]: === Iteration 168 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:07,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:07,073 INFO L82 PathProgramCache]: Analyzing trace with hash -298981954, now seen corresponding path program 152 times [2021-05-06 12:09:07,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:07,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513155346] [2021-05-06 12:09:07,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:07,078 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:07,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:07,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:07,098 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:07,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:07,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:07,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:07,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:07,131 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:07,138 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:07,139 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:07,141 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:07,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:07,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:07,163 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:07,171 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:07,174 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:07,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:07,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:07,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:07,196 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:07,203 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:07,203 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:07,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:07,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:07,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:07,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:07,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:07,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:07,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:08,036 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:08,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513155346] [2021-05-06 12:09:08,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1513155346] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:08,036 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:08,036 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:09:08,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143137027] [2021-05-06 12:09:08,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:09:08,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:08,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:09:08,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1759, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:09:08,037 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:09,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:09,838 INFO L93 Difference]: Finished difference Result 1022 states and 1191 transitions. [2021-05-06 12:09:09,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:09:09,838 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:09,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:09,839 INFO L225 Difference]: With dead ends: 1022 [2021-05-06 12:09:09,839 INFO L226 Difference]: Without dead ends: 599 [2021-05-06 12:09:09,839 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 959 ImplicationChecksByTransitivity, 807.9ms TimeCoverageRelationStatistics Valid=262, Invalid=1900, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:09:09,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-05-06 12:09:10,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 532. [2021-05-06 12:09:10,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 517 states have (on average 1.1779497098646035) internal successors, (609), 520 states have internal predecessors, (609), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:10,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 626 transitions. [2021-05-06 12:09:10,535 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 626 transitions. Word has length 76 [2021-05-06 12:09:10,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:10,535 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 626 transitions. [2021-05-06 12:09:10,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:10,535 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 626 transitions. [2021-05-06 12:09:10,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:10,536 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:10,536 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:10,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable766 [2021-05-06 12:09:10,536 INFO L428 AbstractCegarLoop]: === Iteration 169 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:10,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:10,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1310099204, now seen corresponding path program 153 times [2021-05-06 12:09:10,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:10,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077928394] [2021-05-06 12:09:10,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:10,540 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:10,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:10,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:10,570 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:10,580 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,581 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:09:10,583 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:10,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,585 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:10,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:10,611 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:10,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,625 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:10,626 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:10,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:10,654 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:10,664 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,665 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:10,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:10,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:10,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:10,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:11,872 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:11,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077928394] [2021-05-06 12:09:11,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2077928394] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:11,872 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:11,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:09:11,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465228921] [2021-05-06 12:09:11,873 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:09:11,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:11,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:09:11,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=1760, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:09:11,873 INFO L87 Difference]: Start difference. First operand 532 states and 626 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:13,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:13,959 INFO L93 Difference]: Finished difference Result 1003 states and 1186 transitions. [2021-05-06 12:09:13,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:09:13,960 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:13,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:13,960 INFO L225 Difference]: With dead ends: 1003 [2021-05-06 12:09:13,960 INFO L226 Difference]: Without dead ends: 569 [2021-05-06 12:09:13,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 12 SyntacticMatches, 17 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 1204.6ms TimeCoverageRelationStatistics Valid=273, Invalid=1983, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:09:13,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-06 12:09:14,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 544. [2021-05-06 12:09:14,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 544 states, 529 states have (on average 1.1814744801512287) internal successors, (625), 532 states have internal predecessors, (625), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:14,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 642 transitions. [2021-05-06 12:09:14,621 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 642 transitions. Word has length 76 [2021-05-06 12:09:14,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:14,621 INFO L480 AbstractCegarLoop]: Abstraction has 544 states and 642 transitions. [2021-05-06 12:09:14,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:14,621 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 642 transitions. [2021-05-06 12:09:14,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:14,622 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:14,622 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:14,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable770 [2021-05-06 12:09:14,622 INFO L428 AbstractCegarLoop]: === Iteration 170 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:14,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:14,622 INFO L82 PathProgramCache]: Analyzing trace with hash 787799167, now seen corresponding path program 154 times [2021-05-06 12:09:14,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:14,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332327163] [2021-05-06 12:09:14,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:14,628 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:14,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,640 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:14,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:14,657 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:14,669 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:14,671 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:14,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,681 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,690 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:14,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:14,700 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:14,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:14,711 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:14,713 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:14,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,715 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:14,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:14,741 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:14,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:14,755 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:14,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:14,766 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:14,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:14,782 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:14,792 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:14,793 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:14,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:14,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:14,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:14,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:14,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:14,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:14,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:15,788 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:15,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332327163] [2021-05-06 12:09:15,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1332327163] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:15,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:15,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:09:15,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485003181] [2021-05-06 12:09:15,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:09:15,789 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:15,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:09:15,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=775, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:09:15,789 INFO L87 Difference]: Start difference. First operand 544 states and 642 transitions. Second operand has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 27 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:18,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:18,083 INFO L93 Difference]: Finished difference Result 1141 states and 1321 transitions. [2021-05-06 12:09:18,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:09:18,084 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 27 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:18,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:18,084 INFO L225 Difference]: With dead ends: 1141 [2021-05-06 12:09:18,084 INFO L226 Difference]: Without dead ends: 709 [2021-05-06 12:09:18,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 13 SyntacticMatches, 34 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 998.4ms TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:09:18,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 709 states. [2021-05-06 12:09:18,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 709 to 553. [2021-05-06 12:09:18,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:18,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:18,818 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:18,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:18,818 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:18,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 27 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:18,818 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:18,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:18,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:18,818 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:18,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable775 [2021-05-06 12:09:18,818 INFO L428 AbstractCegarLoop]: === Iteration 171 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:18,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:18,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1467071421, now seen corresponding path program 155 times [2021-05-06 12:09:18,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:18,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722575046] [2021-05-06 12:09:18,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:18,824 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:18,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:18,846 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:18,854 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:18,865 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:18,868 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:18,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,877 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:18,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:18,897 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:18,907 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:18,907 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:18,910 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:18,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:18,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:18,937 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:18,949 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:18,951 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:18,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:18,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:18,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:18,980 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:18,990 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:18,990 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:18,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:19,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:19,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:19,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:19,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:19,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:19,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:20,052 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:20,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722575046] [2021-05-06 12:09:20,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [722575046] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:20,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:20,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:09:20,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431773862] [2021-05-06 12:09:20,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:09:20,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:20,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:09:20,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=880, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:09:20,053 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:22,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:22,360 INFO L93 Difference]: Finished difference Result 1150 states and 1326 transitions. [2021-05-06 12:09:22,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:09:22,361 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:22,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:22,361 INFO L225 Difference]: With dead ends: 1150 [2021-05-06 12:09:22,361 INFO L226 Difference]: Without dead ends: 709 [2021-05-06 12:09:22,362 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 34 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 1041.4ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:09:22,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 709 states. [2021-05-06 12:09:23,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 709 to 553. [2021-05-06 12:09:23,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:23,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:23,145 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:23,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:23,145 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:23,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:23,145 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:23,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:23,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:23,146 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:23,146 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable780 [2021-05-06 12:09:23,146 INFO L428 AbstractCegarLoop]: === Iteration 172 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:23,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:23,146 INFO L82 PathProgramCache]: Analyzing trace with hash 2027771199, now seen corresponding path program 156 times [2021-05-06 12:09:23,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:23,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493690282] [2021-05-06 12:09:23,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:23,151 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:23,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:23,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:23,182 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:23,196 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:23,199 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:23,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,212 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:23,216 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:23,231 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:23,241 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:23,242 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:23,244 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:23,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:23,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:23,273 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:23,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:23,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:23,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:23,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:23,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:23,315 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:23,325 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:23,326 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:23,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:23,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:23,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:23,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:23,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:23,382 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:23,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:24,272 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:24,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493690282] [2021-05-06 12:09:24,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [493690282] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:24,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:24,273 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:09:24,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674634129] [2021-05-06 12:09:24,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:09:24,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:24,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:09:24,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=936, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:09:24,273 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 30 states, 30 states have (on average 2.433333333333333) internal successors, (73), 29 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:26,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:26,608 INFO L93 Difference]: Finished difference Result 1144 states and 1320 transitions. [2021-05-06 12:09:26,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:09:26,609 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.433333333333333) internal successors, (73), 29 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:26,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:26,609 INFO L225 Difference]: With dead ends: 1144 [2021-05-06 12:09:26,610 INFO L226 Difference]: Without dead ends: 703 [2021-05-06 12:09:26,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 33 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 712 ImplicationChecksByTransitivity, 930.9ms TimeCoverageRelationStatistics Valid=135, Invalid=1055, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:09:26,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-05-06 12:09:27,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 553. [2021-05-06 12:09:27,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:27,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:27,414 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:27,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:27,414 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:27,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.433333333333333) internal successors, (73), 29 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:27,415 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:27,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:27,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:27,415 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:27,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable785 [2021-05-06 12:09:27,415 INFO L428 AbstractCegarLoop]: === Iteration 173 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:27,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:27,415 INFO L82 PathProgramCache]: Analyzing trace with hash 2068445949, now seen corresponding path program 157 times [2021-05-06 12:09:27,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:27,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112798964] [2021-05-06 12:09:27,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:27,421 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:27,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:27,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:27,446 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:27,458 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:27,460 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:27,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:27,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:27,488 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:27,498 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:27,499 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:27,501 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:27,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,520 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:27,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:27,529 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:27,541 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:27,543 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:27,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:27,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:27,571 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:27,582 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:27,582 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:27,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:27,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:27,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:27,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:28,582 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:28,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112798964] [2021-05-06 12:09:28,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [112798964] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:28,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:28,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:09:28,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706197278] [2021-05-06 12:09:28,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:09:28,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:28,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:09:28,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:09:28,583 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:30,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:30,878 INFO L93 Difference]: Finished difference Result 1141 states and 1321 transitions. [2021-05-06 12:09:30,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:09:30,879 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:30,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:30,879 INFO L225 Difference]: With dead ends: 1141 [2021-05-06 12:09:30,879 INFO L226 Difference]: Without dead ends: 700 [2021-05-06 12:09:30,880 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 32 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 1005.2ms TimeCoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:09:30,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2021-05-06 12:09:31,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 553. [2021-05-06 12:09:31,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:31,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:31,728 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:31,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:31,728 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:31,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:31,728 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:31,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:31,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:31,728 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:31,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable790 [2021-05-06 12:09:31,728 INFO L428 AbstractCegarLoop]: === Iteration 174 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:31,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:31,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1782620673, now seen corresponding path program 158 times [2021-05-06 12:09:31,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:31,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [599790288] [2021-05-06 12:09:31,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:31,734 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:31,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:31,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:31,761 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:31,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:31,775 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:31,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,784 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:31,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:31,803 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:31,812 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:31,813 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:31,815 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:31,826 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:31,835 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:31,843 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:31,855 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:31,857 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:31,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:31,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:31,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:31,884 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:31,894 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:31,895 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:31,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:31,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:31,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:31,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:31,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:31,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:31,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:32,927 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:32,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [599790288] [2021-05-06 12:09:32,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [599790288] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:32,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:32,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:09:32,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448387818] [2021-05-06 12:09:32,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:09:32,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:32,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:09:32,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=995, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:09:32,928 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 32 states, 32 states have (on average 2.28125) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:35,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:35,408 INFO L93 Difference]: Finished difference Result 1132 states and 1312 transitions. [2021-05-06 12:09:35,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:09:35,409 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.28125) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:35,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:35,409 INFO L225 Difference]: With dead ends: 1132 [2021-05-06 12:09:35,409 INFO L226 Difference]: Without dead ends: 691 [2021-05-06 12:09:35,410 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 13 SyntacticMatches, 30 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 801 ImplicationChecksByTransitivity, 1039.0ms TimeCoverageRelationStatistics Valid=156, Invalid=1176, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:09:35,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2021-05-06 12:09:36,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 553. [2021-05-06 12:09:36,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:36,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:36,232 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:36,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:36,232 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:36,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.28125) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:36,232 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:36,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:36,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:36,232 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:36,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable795 [2021-05-06 12:09:36,232 INFO L428 AbstractCegarLoop]: === Iteration 175 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:36,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:36,233 INFO L82 PathProgramCache]: Analyzing trace with hash 2031266365, now seen corresponding path program 159 times [2021-05-06 12:09:36,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:36,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560041060] [2021-05-06 12:09:36,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:36,238 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:36,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:36,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:36,266 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:36,277 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,279 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:36,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:36,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:36,308 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:36,317 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,318 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:36,320 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:36,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,332 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:36,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:36,348 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:36,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,362 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:36,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:36,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:36,390 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:36,400 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,401 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:36,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:36,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:36,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:36,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:36,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:36,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:36,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:37,476 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:37,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560041060] [2021-05-06 12:09:37,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1560041060] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:37,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:37,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:09:37,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363282646] [2021-05-06 12:09:37,477 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:09:37,477 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:37,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:09:37,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1055, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:09:37,477 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:39,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:39,698 INFO L93 Difference]: Finished difference Result 1123 states and 1303 transitions. [2021-05-06 12:09:39,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:09:39,699 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:39,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:39,700 INFO L225 Difference]: With dead ends: 1123 [2021-05-06 12:09:39,700 INFO L226 Difference]: Without dead ends: 682 [2021-05-06 12:09:39,700 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 30 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 883 ImplicationChecksByTransitivity, 1081.3ms TimeCoverageRelationStatistics Valid=166, Invalid=1240, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:09:39,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-05-06 12:09:40,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 553. [2021-05-06 12:09:40,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:40,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:40,551 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:40,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:40,551 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:40,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:40,551 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:40,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:40,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:40,552 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:40,552 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable800 [2021-05-06 12:09:40,552 INFO L428 AbstractCegarLoop]: === Iteration 176 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:40,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:40,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1678177983, now seen corresponding path program 160 times [2021-05-06 12:09:40,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:40,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373620388] [2021-05-06 12:09:40,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:40,558 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:40,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,566 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:40,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:40,584 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:40,595 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:40,597 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:40,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:40,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:40,625 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:40,635 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:40,636 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:40,638 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:40,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:40,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:40,666 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:40,678 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:40,680 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:40,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:40,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:40,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:40,708 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:40,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:40,718 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:40,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:40,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:40,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:40,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:40,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:40,759 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:40,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:41,837 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:41,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373620388] [2021-05-06 12:09:41,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1373620388] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:41,838 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:41,838 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:09:41,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823827518] [2021-05-06 12:09:41,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:09:41,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:41,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:09:41,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1117, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:09:41,838 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:44,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:44,087 INFO L93 Difference]: Finished difference Result 1114 states and 1294 transitions. [2021-05-06 12:09:44,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:09:44,088 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:44,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:44,089 INFO L225 Difference]: With dead ends: 1114 [2021-05-06 12:09:44,089 INFO L226 Difference]: Without dead ends: 673 [2021-05-06 12:09:44,089 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 29 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 1125.5ms TimeCoverageRelationStatistics Valid=176, Invalid=1306, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:09:44,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-05-06 12:09:44,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 553. [2021-05-06 12:09:44,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:44,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:44,967 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:44,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:44,967 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:44,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:44,968 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:44,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:44,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:44,968 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:44,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable805 [2021-05-06 12:09:44,968 INFO L428 AbstractCegarLoop]: === Iteration 177 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:44,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:44,968 INFO L82 PathProgramCache]: Analyzing trace with hash -371209859, now seen corresponding path program 161 times [2021-05-06 12:09:44,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:44,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800177230] [2021-05-06 12:09:44,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:44,974 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:44,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:44,987 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:44,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:44,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:45,004 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:45,015 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:45,018 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:45,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:45,019 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:45,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:45,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:45,046 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:45,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:45,057 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:45,060 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:45,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:45,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:45,069 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:45,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:45,088 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:45,100 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:45,102 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:45,103 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:45,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:45,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:45,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:45,131 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:45,141 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:45,142 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:45,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:45,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:45,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:45,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:45,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:45,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:45,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:46,234 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:46,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800177230] [2021-05-06 12:09:46,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1800177230] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:46,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:46,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:09:46,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654695668] [2021-05-06 12:09:46,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:09:46,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:46,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:09:46,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1181, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:09:46,236 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:48,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:48,344 INFO L93 Difference]: Finished difference Result 1105 states and 1285 transitions. [2021-05-06 12:09:48,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:09:48,345 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:48,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:48,345 INFO L225 Difference]: With dead ends: 1105 [2021-05-06 12:09:48,345 INFO L226 Difference]: Without dead ends: 664 [2021-05-06 12:09:48,346 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 13 SyntacticMatches, 27 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 966 ImplicationChecksByTransitivity, 1100.7ms TimeCoverageRelationStatistics Valid=186, Invalid=1374, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:09:48,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2021-05-06 12:09:49,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 553. [2021-05-06 12:09:49,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:49,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:49,235 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:49,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:49,235 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:49,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:49,235 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:49,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:49,236 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:49,236 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:49,236 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable810 [2021-05-06 12:09:49,236 INFO L428 AbstractCegarLoop]: === Iteration 178 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:49,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:49,236 INFO L82 PathProgramCache]: Analyzing trace with hash 52436863, now seen corresponding path program 162 times [2021-05-06 12:09:49,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:49,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359507786] [2021-05-06 12:09:49,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:49,242 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:49,254 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:49,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:49,273 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:49,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:49,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:49,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:49,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:49,316 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:49,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:49,327 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:49,329 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:49,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:49,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:49,359 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:49,371 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:49,373 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:49,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,383 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:49,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:49,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:49,403 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:49,413 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:49,414 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:49,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:49,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:49,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:49,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:49,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:49,458 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:49,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:50,510 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:50,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359507786] [2021-05-06 12:09:50,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1359507786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:50,511 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:50,511 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:09:50,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438891064] [2021-05-06 12:09:50,511 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:09:50,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:50,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:09:50,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1247, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:09:50,512 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:52,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:52,966 INFO L93 Difference]: Finished difference Result 1096 states and 1276 transitions. [2021-05-06 12:09:52,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:09:52,966 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:52,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:52,967 INFO L225 Difference]: With dead ends: 1096 [2021-05-06 12:09:52,967 INFO L226 Difference]: Without dead ends: 655 [2021-05-06 12:09:52,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1098.2ms TimeCoverageRelationStatistics Valid=196, Invalid=1444, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:09:52,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-05-06 12:09:53,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 553. [2021-05-06 12:09:53,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:53,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:53,860 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:53,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:53,860 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:53,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:53,860 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:53,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:53,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:53,860 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:53,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable815 [2021-05-06 12:09:53,860 INFO L428 AbstractCegarLoop]: === Iteration 179 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:53,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:53,861 INFO L82 PathProgramCache]: Analyzing trace with hash -976922435, now seen corresponding path program 163 times [2021-05-06 12:09:53,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:53,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985045179] [2021-05-06 12:09:53,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:53,866 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:53,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:53,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:53,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:53,878 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:53,896 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:53,908 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:53,910 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:53,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:53,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:53,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:53,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:53,938 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:53,948 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:53,949 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:53,951 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:53,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:53,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:53,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:53,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:53,979 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:53,991 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:53,993 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:53,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:53,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:54,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:54,023 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:54,033 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:54,034 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:54,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:54,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:54,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:54,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:54,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:54,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:54,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:55,154 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:55,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1985045179] [2021-05-06 12:09:55,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1985045179] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:55,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:55,155 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:09:55,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552827319] [2021-05-06 12:09:55,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:09:55,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:55,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:09:55,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1315, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:09:55,155 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:57,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:57,213 INFO L93 Difference]: Finished difference Result 1087 states and 1267 transitions. [2021-05-06 12:09:57,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:09:57,214 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:57,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:57,214 INFO L225 Difference]: With dead ends: 1087 [2021-05-06 12:09:57,215 INFO L226 Difference]: Without dead ends: 646 [2021-05-06 12:09:57,215 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 15 SyntacticMatches, 23 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1124.6ms TimeCoverageRelationStatistics Valid=206, Invalid=1516, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:09:57,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-06 12:09:58,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 553. [2021-05-06 12:09:58,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:58,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:09:58,077 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:09:58,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:58,077 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:09:58,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:58,078 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:09:58,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:58,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:58,078 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:58,078 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable820 [2021-05-06 12:09:58,078 INFO L428 AbstractCegarLoop]: === Iteration 180 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:58,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:58,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1820927937, now seen corresponding path program 164 times [2021-05-06 12:09:58,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:58,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909641396] [2021-05-06 12:09:58,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:58,084 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:58,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:58,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:58,113 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:58,125 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,127 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:58,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:58,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:58,157 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:58,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,167 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:58,170 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:58,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,189 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:58,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:58,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:58,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,213 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:58,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:58,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:58,241 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:58,251 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,252 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:58,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:58,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:58,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:58,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:58,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:58,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:58,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:59,377 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:59,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909641396] [2021-05-06 12:09:59,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [909641396] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:59,377 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:59,377 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:09:59,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398979037] [2021-05-06 12:09:59,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:09:59,378 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:59,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:09:59,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1456, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:09:59,378 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:01,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:01,653 INFO L93 Difference]: Finished difference Result 1096 states and 1272 transitions. [2021-05-06 12:10:01,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:10:01,654 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:01,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:01,654 INFO L225 Difference]: With dead ends: 1096 [2021-05-06 12:10:01,654 INFO L226 Difference]: Without dead ends: 655 [2021-05-06 12:10:01,655 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 13 SyntacticMatches, 24 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 1103.2ms TimeCoverageRelationStatistics Valid=215, Invalid=1591, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:10:01,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-05-06 12:10:02,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 553. [2021-05-06 12:10:02,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:02,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:10:02,547 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:10:02,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:02,547 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:10:02,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:02,547 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:10:02,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:02,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:02,547 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:02,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable825 [2021-05-06 12:10:02,548 INFO L428 AbstractCegarLoop]: === Iteration 181 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:02,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:02,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1546168323, now seen corresponding path program 165 times [2021-05-06 12:10:02,548 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:02,548 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642945108] [2021-05-06 12:10:02,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:02,554 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:02,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:02,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:02,590 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:02,601 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,604 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:02,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:02,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:02,631 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:02,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,642 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:02,644 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:02,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:02,656 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:02,673 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:02,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,687 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:02,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:02,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:02,717 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:02,726 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,727 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:02,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:02,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:02,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:02,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:02,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:02,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:02,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:03,892 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:03,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642945108] [2021-05-06 12:10:03,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1642945108] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:03,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:03,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:10:03,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410074514] [2021-05-06 12:10:03,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:10:03,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:03,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:10:03,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1530, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:10:03,893 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:06,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:06,114 INFO L93 Difference]: Finished difference Result 1090 states and 1266 transitions. [2021-05-06 12:10:06,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:10:06,114 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:06,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:06,123 INFO L225 Difference]: With dead ends: 1090 [2021-05-06 12:10:06,123 INFO L226 Difference]: Without dead ends: 649 [2021-05-06 12:10:06,124 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1126 ImplicationChecksByTransitivity, 1141.7ms TimeCoverageRelationStatistics Valid=225, Invalid=1667, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:10:06,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 649 states. [2021-05-06 12:10:07,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 649 to 553. [2021-05-06 12:10:07,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:07,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:10:07,052 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:10:07,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:07,052 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:10:07,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:07,052 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:10:07,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:07,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:07,052 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:07,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable830 [2021-05-06 12:10:07,053 INFO L428 AbstractCegarLoop]: === Iteration 182 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:07,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:07,053 INFO L82 PathProgramCache]: Analyzing trace with hash -159964929, now seen corresponding path program 166 times [2021-05-06 12:10:07,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:07,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146311205] [2021-05-06 12:10:07,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:07,058 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:07,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:07,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:07,083 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:07,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:07,097 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:07,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:07,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:07,126 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:07,135 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:07,136 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:07,138 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:07,139 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,139 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:07,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:07,164 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:07,175 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:07,177 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:07,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:07,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:07,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:07,203 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:07,212 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:07,213 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:07,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:07,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:07,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:07,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:07,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:07,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:07,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:08,229 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:08,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2146311205] [2021-05-06 12:10:08,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2146311205] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:08,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:08,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:10:08,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888304261] [2021-05-06 12:10:08,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:10:08,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:08,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:10:08,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1531, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:10:08,230 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 40 states, 40 states have (on average 1.825) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:10,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:10,613 INFO L93 Difference]: Finished difference Result 1060 states and 1240 transitions. [2021-05-06 12:10:10,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:10:10,614 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:10,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:10,614 INFO L225 Difference]: With dead ends: 1060 [2021-05-06 12:10:10,614 INFO L226 Difference]: Without dead ends: 619 [2021-05-06 12:10:10,615 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1006.5ms TimeCoverageRelationStatistics Valid=236, Invalid=1744, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:10:10,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2021-05-06 12:10:11,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 553. [2021-05-06 12:10:11,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:11,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:10:11,522 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:10:11,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:11,523 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:10:11,523 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:11,523 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:10:11,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:11,523 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:11,523 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:11,523 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable835 [2021-05-06 12:10:11,523 INFO L428 AbstractCegarLoop]: === Iteration 183 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:11,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:11,523 INFO L82 PathProgramCache]: Analyzing trace with hash -97925315, now seen corresponding path program 167 times [2021-05-06 12:10:11,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:11,524 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729031880] [2021-05-06 12:10:11,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:11,529 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:11,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:11,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:11,556 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:11,568 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,571 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:11,571 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:11,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:11,600 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:11,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,611 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:11,613 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:11,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:11,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:11,640 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:11,652 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,654 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:11,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:11,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:11,684 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:11,693 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:11,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:11,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:11,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:11,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:11,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:11,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:11,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:12,893 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:12,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729031880] [2021-05-06 12:10:12,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [729031880] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:12,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:12,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:10:12,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893054945] [2021-05-06 12:10:12,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:10:12,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:12,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:10:12,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1607, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:10:12,894 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:14,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:14,755 INFO L93 Difference]: Finished difference Result 1051 states and 1231 transitions. [2021-05-06 12:10:14,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:10:14,755 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:14,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:14,756 INFO L225 Difference]: With dead ends: 1051 [2021-05-06 12:10:14,756 INFO L226 Difference]: Without dead ends: 610 [2021-05-06 12:10:14,757 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 13 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1053 ImplicationChecksByTransitivity, 1184.4ms TimeCoverageRelationStatistics Valid=246, Invalid=1824, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:10:14,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2021-05-06 12:10:15,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 553. [2021-05-06 12:10:15,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:15,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:10:15,669 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:10:15,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:15,669 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:10:15,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:15,669 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:10:15,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:15,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:15,669 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:15,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable840 [2021-05-06 12:10:15,669 INFO L428 AbstractCegarLoop]: === Iteration 184 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:15,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:15,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1903363649, now seen corresponding path program 168 times [2021-05-06 12:10:15,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:15,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714682137] [2021-05-06 12:10:15,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:15,675 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:15,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:15,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:15,704 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:15,716 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,718 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:15,727 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,736 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:15,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:15,746 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:15,756 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,757 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:15,759 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:15,759 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:15,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:15,785 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:15,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,799 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:15,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:15,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:15,827 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:15,837 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,838 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:15,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:15,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:15,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:15,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:15,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:15,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:15,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:17,092 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:17,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714682137] [2021-05-06 12:10:17,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [714682137] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:17,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:17,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:10:17,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784204674] [2021-05-06 12:10:17,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:10:17,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:17,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:10:17,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1685, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:10:17,093 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:18,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:18,809 INFO L93 Difference]: Finished difference Result 1042 states and 1222 transitions. [2021-05-06 12:10:18,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:10:18,809 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:18,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:18,810 INFO L225 Difference]: With dead ends: 1042 [2021-05-06 12:10:18,810 INFO L226 Difference]: Without dead ends: 601 [2021-05-06 12:10:18,810 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1072 ImplicationChecksByTransitivity, 1249.8ms TimeCoverageRelationStatistics Valid=256, Invalid=1906, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:10:18,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-05-06 12:10:19,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 553. [2021-05-06 12:10:19,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:19,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:10:19,635 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:10:19,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:19,636 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:10:19,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:19,636 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:10:19,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:19,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:19,636 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:19,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable845 [2021-05-06 12:10:19,636 INFO L428 AbstractCegarLoop]: === Iteration 185 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:19,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:19,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1573955197, now seen corresponding path program 169 times [2021-05-06 12:10:19,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:19,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420256477] [2021-05-06 12:10:19,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:19,642 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:19,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:19,653 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:19,669 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:19,681 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,683 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:19,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:19,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:19,712 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:19,722 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,723 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:19,725 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:19,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:19,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:19,753 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:19,765 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,767 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:19,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:19,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:19,795 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:19,805 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,806 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:19,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:19,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:19,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,849 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:19,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:21,066 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:21,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420256477] [2021-05-06 12:10:21,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [420256477] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:21,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:21,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:10:21,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644022464] [2021-05-06 12:10:21,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:10:21,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:21,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:10:21,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:10:21,067 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:23,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:23,178 INFO L93 Difference]: Finished difference Result 1033 states and 1213 transitions. [2021-05-06 12:10:23,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:10:23,179 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:23,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:23,179 INFO L225 Difference]: With dead ends: 1033 [2021-05-06 12:10:23,179 INFO L226 Difference]: Without dead ends: 592 [2021-05-06 12:10:23,180 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1048 ImplicationChecksByTransitivity, 1259.9ms TimeCoverageRelationStatistics Valid=266, Invalid=1990, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:10:23,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-06 12:10:24,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 553. [2021-05-06 12:10:24,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:24,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:10:24,049 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:10:24,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:24,049 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:10:24,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:24,049 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:10:24,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:24,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:24,049 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:24,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable850 [2021-05-06 12:10:24,049 INFO L428 AbstractCegarLoop]: === Iteration 186 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:24,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:24,050 INFO L82 PathProgramCache]: Analyzing trace with hash -14392705, now seen corresponding path program 170 times [2021-05-06 12:10:24,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:24,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497349577] [2021-05-06 12:10:24,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:24,055 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:24,067 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,068 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:24,077 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:24,085 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:24,097 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:24,099 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:24,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:24,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:24,129 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:24,139 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:24,139 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:24,142 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:24,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:24,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:24,170 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:24,182 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:24,184 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:24,193 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:24,203 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:24,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:24,214 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:24,224 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:24,224 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:24,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:24,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:24,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:24,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:24,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:24,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:24,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:25,533 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:25,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497349577] [2021-05-06 12:10:25,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [497349577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:25,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:25,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:10:25,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195671257] [2021-05-06 12:10:25,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:10:25,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:25,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:10:25,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1847, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:10:25,534 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:27,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:27,534 INFO L93 Difference]: Finished difference Result 1028 states and 1208 transitions. [2021-05-06 12:10:27,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:10:27,534 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:27,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:27,535 INFO L225 Difference]: With dead ends: 1028 [2021-05-06 12:10:27,535 INFO L226 Difference]: Without dead ends: 587 [2021-05-06 12:10:27,536 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 19 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1015 ImplicationChecksByTransitivity, 1306.9ms TimeCoverageRelationStatistics Valid=276, Invalid=2076, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:10:27,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-05-06 12:10:28,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 553. [2021-05-06 12:10:28,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 538 states have (on average 1.178438661710037) internal successors, (634), 541 states have internal predecessors, (634), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:28,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 651 transitions. [2021-05-06 12:10:28,343 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 651 transitions. Word has length 79 [2021-05-06 12:10:28,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:28,343 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 651 transitions. [2021-05-06 12:10:28,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:28,343 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 651 transitions. [2021-05-06 12:10:28,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:28,343 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:28,343 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:28,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable855 [2021-05-06 12:10:28,344 INFO L428 AbstractCegarLoop]: === Iteration 187 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:28,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:28,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1025509955, now seen corresponding path program 171 times [2021-05-06 12:10:28,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:28,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987893504] [2021-05-06 12:10:28,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:28,348 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:28,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:28,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:28,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:28,362 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:28,375 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:28,385 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:28,385 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:10:28,387 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:28,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:28,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:28,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:28,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:28,415 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:28,426 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:28,429 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:28,437 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:28,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:28,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:28,450 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:28,457 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:28,467 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:28,467 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:28,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:28,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:28,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:28,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:28,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:28,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:28,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:29,796 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:29,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987893504] [2021-05-06 12:10:29,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [987893504] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:29,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:29,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:10:29,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845736141] [2021-05-06 12:10:29,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:10:29,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:29,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:10:29,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1931, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:10:29,797 INFO L87 Difference]: Start difference. First operand 553 states and 651 transitions. Second operand has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:32,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:32,168 INFO L93 Difference]: Finished difference Result 1042 states and 1232 transitions. [2021-05-06 12:10:32,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:10:32,169 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:32,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:32,169 INFO L225 Difference]: With dead ends: 1042 [2021-05-06 12:10:32,169 INFO L226 Difference]: Without dead ends: 590 [2021-05-06 12:10:32,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 12 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 973 ImplicationChecksByTransitivity, 1315.6ms TimeCoverageRelationStatistics Valid=286, Invalid=2164, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:10:32,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-06 12:10:32,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 565. [2021-05-06 12:10:32,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 565 states, 550 states have (on average 1.1818181818181819) internal successors, (650), 553 states have internal predecessors, (650), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:32,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 565 states to 565 states and 667 transitions. [2021-05-06 12:10:32,994 INFO L78 Accepts]: Start accepts. Automaton has 565 states and 667 transitions. Word has length 79 [2021-05-06 12:10:32,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:32,994 INFO L480 AbstractCegarLoop]: Abstraction has 565 states and 667 transitions. [2021-05-06 12:10:32,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:32,994 INFO L276 IsEmpty]: Start isEmpty. Operand 565 states and 667 transitions. [2021-05-06 12:10:32,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 12:10:32,994 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:32,994 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:32,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable859 [2021-05-06 12:10:32,994 INFO L428 AbstractCegarLoop]: === Iteration 188 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:32,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:32,995 INFO L82 PathProgramCache]: Analyzing trace with hash -860791901, now seen corresponding path program 8 times [2021-05-06 12:10:32,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:32,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911943445] [2021-05-06 12:10:32,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:33,005 WARN L240 tifierPushTermWalker]: treesize reduction 143, result has 12.3 percent of original size [2021-05-06 12:10:33,013 WARN L245 tifierPushTermWalker]: treesize reduction 143, result has 12.3 percent of original size 20 [2021-05-06 12:10:33,019 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:33,024 WARN L240 tifierPushTermWalker]: treesize reduction 70, result has 54.2 percent of original size [2021-05-06 12:10:33,066 WARN L245 tifierPushTermWalker]: treesize reduction 70, result has 54.2 percent of original size 83 [2021-05-06 12:10:33,093 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:33,094 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:33,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:33,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:33,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:33,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:33,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:33,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:33,440 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:33,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911943445] [2021-05-06 12:10:33,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [911943445] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:33,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:33,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:10:33,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795258752] [2021-05-06 12:10:33,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:10:33,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:33,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:10:33,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=362, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:10:33,440 INFO L87 Difference]: Start difference. First operand 565 states and 667 transitions. Second operand has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 22 states have internal predecessors, (68), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:10:34,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:34,649 INFO L93 Difference]: Finished difference Result 1044 states and 1228 transitions. [2021-05-06 12:10:34,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:10:34,650 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 22 states have internal predecessors, (68), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 81 [2021-05-06 12:10:34,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:34,650 INFO L225 Difference]: With dead ends: 1044 [2021-05-06 12:10:34,650 INFO L226 Difference]: Without dead ends: 585 [2021-05-06 12:10:34,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 25 SyntacticMatches, 15 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 415.7ms TimeCoverageRelationStatistics Valid=296, Invalid=696, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:10:34,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 585 states. [2021-05-06 12:10:35,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 585 to 577. [2021-05-06 12:10:35,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 577 states, 562 states have (on average 1.1779359430604983) internal successors, (662), 565 states have internal predecessors, (662), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:35,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 577 states to 577 states and 679 transitions. [2021-05-06 12:10:35,524 INFO L78 Accepts]: Start accepts. Automaton has 577 states and 679 transitions. Word has length 81 [2021-05-06 12:10:35,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:35,524 INFO L480 AbstractCegarLoop]: Abstraction has 577 states and 679 transitions. [2021-05-06 12:10:35,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 22 states have internal predecessors, (68), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:10:35,525 INFO L276 IsEmpty]: Start isEmpty. Operand 577 states and 679 transitions. [2021-05-06 12:10:35,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:10:35,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:35,525 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:35,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable860 [2021-05-06 12:10:35,525 INFO L428 AbstractCegarLoop]: === Iteration 189 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:35,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:35,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1888113636, now seen corresponding path program 172 times [2021-05-06 12:10:35,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:35,525 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189397398] [2021-05-06 12:10:35,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:35,531 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:35,542 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:35,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:35,559 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:35,571 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:35,573 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:35,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,584 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:35,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:35,601 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:35,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:35,611 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:35,613 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:35,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:35,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:35,650 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:35,664 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:35,666 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:35,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:35,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:35,698 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:35,709 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:35,710 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:35,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:35,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:35,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:35,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:35,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:35,753 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:35,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:36,806 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:36,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189397398] [2021-05-06 12:10:36,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1189397398] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:36,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:36,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:10:36,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530316144] [2021-05-06 12:10:36,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:10:36,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:36,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:10:36,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=832, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:10:36,807 INFO L87 Difference]: Start difference. First operand 577 states and 679 transitions. Second operand has 29 states, 29 states have (on average 2.6206896551724137) internal successors, (76), 28 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:39,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:39,505 INFO L93 Difference]: Finished difference Result 1210 states and 1397 transitions. [2021-05-06 12:10:39,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:10:39,505 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.6206896551724137) internal successors, (76), 28 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:10:39,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:39,506 INFO L225 Difference]: With dead ends: 1210 [2021-05-06 12:10:39,506 INFO L226 Difference]: Without dead ends: 751 [2021-05-06 12:10:39,507 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 37 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 1104.3ms TimeCoverageRelationStatistics Valid=119, Invalid=1003, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:10:39,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-05-06 12:10:40,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 586. [2021-05-06 12:10:40,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:40,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:10:40,473 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:10:40,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:40,474 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:10:40,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.6206896551724137) internal successors, (76), 28 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:40,474 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:10:40,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:10:40,474 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:40,474 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:40,474 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable865 [2021-05-06 12:10:40,474 INFO L428 AbstractCegarLoop]: === Iteration 190 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:40,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:40,474 INFO L82 PathProgramCache]: Analyzing trace with hash 720673822, now seen corresponding path program 173 times [2021-05-06 12:10:40,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:40,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990276168] [2021-05-06 12:10:40,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:40,480 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:40,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:40,499 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:40,515 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:40,526 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,529 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:40,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:40,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:40,558 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:40,568 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,570 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:40,573 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:40,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,585 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:40,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:40,601 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:40,613 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,615 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:40,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:40,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:40,644 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:40,654 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,654 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:40,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:40,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:40,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:40,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:40,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:40,697 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:40,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:41,756 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:41,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990276168] [2021-05-06 12:10:41,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1990276168] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:41,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:41,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:10:41,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227526560] [2021-05-06 12:10:41,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:10:41,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:41,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:10:41,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=886, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:10:41,757 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 30 states, 30 states have (on average 2.533333333333333) internal successors, (76), 29 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:44,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:44,544 INFO L93 Difference]: Finished difference Result 1228 states and 1415 transitions. [2021-05-06 12:10:44,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:10:44,544 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.533333333333333) internal successors, (76), 29 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:10:44,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:44,545 INFO L225 Difference]: With dead ends: 1228 [2021-05-06 12:10:44,545 INFO L226 Difference]: Without dead ends: 760 [2021-05-06 12:10:44,545 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 36 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 1109.4ms TimeCoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:10:44,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2021-05-06 12:10:45,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 586. [2021-05-06 12:10:45,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:45,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:10:45,525 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:10:45,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:45,525 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:10:45,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.533333333333333) internal successors, (76), 29 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:45,525 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:10:45,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:10:45,526 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:45,526 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 17, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:45,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable870 [2021-05-06 12:10:45,526 INFO L428 AbstractCegarLoop]: === Iteration 191 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:45,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:45,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1399946076, now seen corresponding path program 174 times [2021-05-06 12:10:45,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:45,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180737757] [2021-05-06 12:10:45,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:45,532 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:45,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:45,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:45,559 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:45,570 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:45,572 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:45,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:45,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:45,601 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:45,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:45,611 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:45,613 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:45,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:45,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:45,642 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:45,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:45,656 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:45,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:45,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:45,683 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:45,694 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:45,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:45,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:45,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:45,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:45,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:45,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:45,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:45,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:46,823 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:46,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180737757] [2021-05-06 12:10:46,824 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1180737757] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:46,824 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:46,824 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:10:46,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858778272] [2021-05-06 12:10:46,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:10:46,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:46,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:10:46,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=942, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:10:46,825 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 31 states, 31 states have (on average 2.4516129032258065) internal successors, (76), 30 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:49,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:49,686 INFO L93 Difference]: Finished difference Result 1219 states and 1406 transitions. [2021-05-06 12:10:49,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:10:49,687 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.4516129032258065) internal successors, (76), 30 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:10:49,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:49,688 INFO L225 Difference]: With dead ends: 1219 [2021-05-06 12:10:49,688 INFO L226 Difference]: Without dead ends: 751 [2021-05-06 12:10:49,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 35 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 1137.4ms TimeCoverageRelationStatistics Valid=139, Invalid=1121, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:10:49,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-05-06 12:10:50,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 586. [2021-05-06 12:10:50,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:50,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:10:50,717 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:10:50,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:50,717 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:10:50,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.4516129032258065) internal successors, (76), 30 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:50,718 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:10:50,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:10:50,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:50,718 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:50,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable875 [2021-05-06 12:10:50,719 INFO L428 AbstractCegarLoop]: === Iteration 192 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:50,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:50,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1960645854, now seen corresponding path program 175 times [2021-05-06 12:10:50,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:50,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891276081] [2021-05-06 12:10:50,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:50,724 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:50,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:50,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:50,753 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:50,765 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:50,768 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:50,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:50,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:50,795 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:50,805 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:50,806 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:50,808 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:50,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:50,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:50,834 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:50,846 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:50,848 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:50,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:50,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:50,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:50,876 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:50,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:50,886 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:50,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:50,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:50,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:50,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:50,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:50,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:50,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:51,977 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:51,978 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891276081] [2021-05-06 12:10:51,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [891276081] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:51,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:51,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:10:51,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357501331] [2021-05-06 12:10:51,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:10:51,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:51,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:10:51,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1000, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:10:51,981 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:54,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:54,837 INFO L93 Difference]: Finished difference Result 1210 states and 1397 transitions. [2021-05-06 12:10:54,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:10:54,838 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:10:54,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:54,838 INFO L225 Difference]: With dead ends: 1210 [2021-05-06 12:10:54,839 INFO L226 Difference]: Without dead ends: 742 [2021-05-06 12:10:54,839 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 34 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 1090.4ms TimeCoverageRelationStatistics Valid=149, Invalid=1183, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:10:54,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 742 states. [2021-05-06 12:10:55,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 742 to 586. [2021-05-06 12:10:55,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:55,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:10:55,916 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:10:55,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:55,917 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:10:55,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:55,917 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:10:55,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:10:55,917 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:55,917 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:55,917 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable880 [2021-05-06 12:10:55,917 INFO L428 AbstractCegarLoop]: === Iteration 193 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:55,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:55,918 INFO L82 PathProgramCache]: Analyzing trace with hash 2001320604, now seen corresponding path program 176 times [2021-05-06 12:10:55,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:55,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [361938685] [2021-05-06 12:10:55,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:55,923 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:55,924 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:55,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:55,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:55,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:55,950 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:55,961 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:55,964 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:55,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:55,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:55,983 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:55,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:55,993 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:56,002 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:56,003 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:56,005 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:56,006 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:56,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:56,033 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:56,045 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:56,047 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:56,048 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,049 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:56,061 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:56,075 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:56,085 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:56,086 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:56,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:56,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:56,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:56,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:56,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:56,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:56,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:57,215 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:57,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [361938685] [2021-05-06 12:10:57,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [361938685] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:57,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:57,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:10:57,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577646958] [2021-05-06 12:10:57,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:10:57,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:57,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:10:57,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1060, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:10:57,216 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 33 states, 33 states have (on average 2.303030303030303) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:00,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:00,020 INFO L93 Difference]: Finished difference Result 1201 states and 1388 transitions. [2021-05-06 12:11:00,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:11:00,020 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.303030303030303) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:00,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:00,021 INFO L225 Difference]: With dead ends: 1201 [2021-05-06 12:11:00,021 INFO L226 Difference]: Without dead ends: 733 [2021-05-06 12:11:00,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 33 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 865 ImplicationChecksByTransitivity, 1134.0ms TimeCoverageRelationStatistics Valid=159, Invalid=1247, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:11:00,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 733 states. [2021-05-06 12:11:01,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 733 to 586. [2021-05-06 12:11:01,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:01,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:01,102 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:01,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:01,102 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:01,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.303030303030303) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:01,102 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:01,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:01,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:01,102 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:01,102 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable885 [2021-05-06 12:11:01,102 INFO L428 AbstractCegarLoop]: === Iteration 194 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:01,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:01,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1849746018, now seen corresponding path program 177 times [2021-05-06 12:11:01,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:01,103 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53232476] [2021-05-06 12:11:01,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:01,121 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:01,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:01,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:01,151 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:01,162 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,165 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:01,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:01,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:01,191 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:01,201 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,201 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:01,203 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:01,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:01,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:01,230 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:01,242 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,245 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:01,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,247 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:01,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:01,280 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:01,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,293 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:01,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:01,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:01,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:01,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:01,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:01,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:01,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:02,447 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:02,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53232476] [2021-05-06 12:11:02,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [53232476] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:02,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:02,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:11:02,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712947672] [2021-05-06 12:11:02,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:11:02,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:02,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:11:02,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1122, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:11:02,448 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:05,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:05,174 INFO L93 Difference]: Finished difference Result 1192 states and 1379 transitions. [2021-05-06 12:11:05,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:11:05,174 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:05,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:05,175 INFO L225 Difference]: With dead ends: 1192 [2021-05-06 12:11:05,175 INFO L226 Difference]: Without dead ends: 724 [2021-05-06 12:11:05,175 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 32 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 937 ImplicationChecksByTransitivity, 1160.7ms TimeCoverageRelationStatistics Valid=169, Invalid=1313, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:11:05,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2021-05-06 12:11:06,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 586. [2021-05-06 12:11:06,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:06,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:06,418 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:06,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:06,419 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:06,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:06,419 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:06,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:06,419 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:06,419 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 13, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:06,419 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable890 [2021-05-06 12:11:06,419 INFO L428 AbstractCegarLoop]: === Iteration 195 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:06,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:06,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1964141020, now seen corresponding path program 178 times [2021-05-06 12:11:06,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:06,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398615283] [2021-05-06 12:11:06,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:06,425 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:06,437 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:06,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:06,455 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:06,467 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,470 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:06,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:06,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:06,499 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:06,509 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,510 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:06,512 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:06,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:06,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:06,541 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:06,553 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,555 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:06,564 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:06,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:06,586 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:06,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,597 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:06,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:06,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:06,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:06,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:06,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:06,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:06,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:07,804 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:07,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398615283] [2021-05-06 12:11:07,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [398615283] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:07,804 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:07,804 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:11:07,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127464789] [2021-05-06 12:11:07,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:11:07,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:07,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:11:07,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:11:07,805 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:10,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:10,691 INFO L93 Difference]: Finished difference Result 1183 states and 1370 transitions. [2021-05-06 12:11:10,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:11:10,692 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:10,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:10,692 INFO L225 Difference]: With dead ends: 1183 [2021-05-06 12:11:10,692 INFO L226 Difference]: Without dead ends: 715 [2021-05-06 12:11:10,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 31 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 1203.8ms TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:11:10,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2021-05-06 12:11:11,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 586. [2021-05-06 12:11:11,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:11,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:11,837 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:11,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:11,837 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:11,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:11,838 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:11,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:11,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:11,838 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:11,838 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable895 [2021-05-06 12:11:11,838 INFO L428 AbstractCegarLoop]: === Iteration 196 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:11,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:11,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1611052638, now seen corresponding path program 179 times [2021-05-06 12:11:11,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:11,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181932180] [2021-05-06 12:11:11,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:11,844 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:11,844 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:11,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:11,871 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:11,883 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:11,904 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:11,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:11,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:11,933 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:11,942 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:11,943 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:11,945 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:11,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:11,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:11,973 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:11,985 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:11,988 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:11,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:12,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:12,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:12,016 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:12,026 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:12,027 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:12,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:12,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:12,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:12,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:12,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:12,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:12,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:13,230 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:13,230 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181932180] [2021-05-06 12:11:13,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [181932180] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:13,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:13,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:11:13,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258706745] [2021-05-06 12:11:13,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:11:13,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:13,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:11:13,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1252, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:11:13,231 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:15,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:15,910 INFO L93 Difference]: Finished difference Result 1174 states and 1361 transitions. [2021-05-06 12:11:15,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:11:15,911 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:15,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:15,911 INFO L225 Difference]: With dead ends: 1174 [2021-05-06 12:11:15,911 INFO L226 Difference]: Without dead ends: 706 [2021-05-06 12:11:15,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 30 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1054 ImplicationChecksByTransitivity, 1212.2ms TimeCoverageRelationStatistics Valid=189, Invalid=1451, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:11:15,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2021-05-06 12:11:16,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 586. [2021-05-06 12:11:16,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:16,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:16,960 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:16,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:16,960 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:16,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:16,960 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:16,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:16,960 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:16,960 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:16,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable900 [2021-05-06 12:11:16,960 INFO L428 AbstractCegarLoop]: === Iteration 197 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:16,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:16,962 INFO L82 PathProgramCache]: Analyzing trace with hash -438335204, now seen corresponding path program 180 times [2021-05-06 12:11:16,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:16,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612958314] [2021-05-06 12:11:16,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:16,972 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:16,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:16,993 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:17,000 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:17,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:17,014 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:17,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:17,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:17,024 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:17,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:17,040 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:17,050 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:17,051 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:17,053 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:17,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:17,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:17,072 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:17,074 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:17,081 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:17,093 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:17,095 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:17,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:17,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:17,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:17,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:17,123 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:17,133 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:17,134 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:17,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:17,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:17,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:17,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:17,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:17,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:17,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:18,342 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:18,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612958314] [2021-05-06 12:11:18,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1612958314] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:18,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:18,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:11:18,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218141764] [2021-05-06 12:11:18,343 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:11:18,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:18,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:11:18,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1320, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:11:18,343 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:20,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:20,875 INFO L93 Difference]: Finished difference Result 1165 states and 1352 transitions. [2021-05-06 12:11:20,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:11:20,876 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:20,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:20,876 INFO L225 Difference]: With dead ends: 1165 [2021-05-06 12:11:20,876 INFO L226 Difference]: Without dead ends: 697 [2021-05-06 12:11:20,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 13 SyntacticMatches, 28 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 1195.6ms TimeCoverageRelationStatistics Valid=199, Invalid=1523, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:11:20,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2021-05-06 12:11:21,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 586. [2021-05-06 12:11:21,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:21,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:21,990 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:21,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:21,990 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:21,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:21,990 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:21,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:21,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:21,991 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:21,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable905 [2021-05-06 12:11:21,991 INFO L428 AbstractCegarLoop]: === Iteration 198 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:21,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:21,991 INFO L82 PathProgramCache]: Analyzing trace with hash -14688482, now seen corresponding path program 181 times [2021-05-06 12:11:21,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:21,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769145458] [2021-05-06 12:11:21,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:21,996 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:22,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,009 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:22,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:22,026 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:22,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:22,040 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:22,049 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,050 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,059 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:22,062 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:22,069 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:22,079 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:22,080 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:22,082 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:22,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:22,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:22,112 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:22,123 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:22,126 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:22,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:22,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:22,152 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:22,169 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:22,181 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:22,182 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:22,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:22,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:22,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:22,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:22,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:22,228 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:22,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:23,357 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:23,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769145458] [2021-05-06 12:11:23,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [769145458] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:23,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:23,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:11:23,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639960895] [2021-05-06 12:11:23,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:11:23,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:23,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:11:23,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1390, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:11:23,358 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:25,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:25,687 INFO L93 Difference]: Finished difference Result 1156 states and 1343 transitions. [2021-05-06 12:11:25,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:11:25,687 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:25,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:25,688 INFO L225 Difference]: With dead ends: 1156 [2021-05-06 12:11:25,688 INFO L226 Difference]: Without dead ends: 688 [2021-05-06 12:11:25,689 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 14 SyntacticMatches, 26 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1083 ImplicationChecksByTransitivity, 1158.8ms TimeCoverageRelationStatistics Valid=209, Invalid=1597, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:11:25,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2021-05-06 12:11:26,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 586. [2021-05-06 12:11:26,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:26,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:26,767 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:26,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:26,767 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:26,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:26,768 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:26,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:26,768 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:26,768 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:26,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable910 [2021-05-06 12:11:26,768 INFO L428 AbstractCegarLoop]: === Iteration 199 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:26,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:26,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1044047780, now seen corresponding path program 182 times [2021-05-06 12:11:26,768 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:26,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736896542] [2021-05-06 12:11:26,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:26,774 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:26,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:26,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:26,799 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:26,814 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,816 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:26,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,838 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:26,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:26,850 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:26,863 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,863 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:26,866 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:26,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:26,878 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:26,896 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:26,909 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,911 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:26,912 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:26,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:26,941 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:26,951 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,952 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:26,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:26,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:26,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:26,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:26,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:26,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:26,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:28,042 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:28,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736896542] [2021-05-06 12:11:28,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [736896542] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:28,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:28,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:11:28,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898096545] [2021-05-06 12:11:28,043 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:11:28,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:28,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:11:28,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1462, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:11:28,043 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:30,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:30,260 INFO L93 Difference]: Finished difference Result 1147 states and 1334 transitions. [2021-05-06 12:11:30,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:11:30,260 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:30,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:30,261 INFO L225 Difference]: With dead ends: 1147 [2021-05-06 12:11:30,261 INFO L226 Difference]: Without dead ends: 679 [2021-05-06 12:11:30,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 13 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1134 ImplicationChecksByTransitivity, 1086.2ms TimeCoverageRelationStatistics Valid=219, Invalid=1673, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:11:30,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-06 12:11:31,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 586. [2021-05-06 12:11:31,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:31,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:31,325 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:31,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:31,325 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:31,325 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:31,325 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:31,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:31,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:31,325 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:31,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable915 [2021-05-06 12:11:31,325 INFO L428 AbstractCegarLoop]: === Iteration 200 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:31,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:31,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1888053282, now seen corresponding path program 183 times [2021-05-06 12:11:31,326 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:31,326 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [905669553] [2021-05-06 12:11:31,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:31,331 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:31,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:31,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:31,357 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:31,368 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:31,370 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:31,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:31,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:31,395 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:31,404 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:31,405 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:31,407 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:31,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:31,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:31,433 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:31,444 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:31,446 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:31,447 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,447 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:31,456 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:31,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:31,471 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:31,480 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:31,480 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:31,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:31,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:31,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:31,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:31,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:31,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:31,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:32,668 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:32,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [905669553] [2021-05-06 12:11:32,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [905669553] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:32,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:32,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:11:32,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790642794] [2021-05-06 12:11:32,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:11:32,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:32,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:11:32,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1536, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:11:32,669 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:35,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:35,084 INFO L93 Difference]: Finished difference Result 1138 states and 1325 transitions. [2021-05-06 12:11:35,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:11:35,084 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:35,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:35,085 INFO L225 Difference]: With dead ends: 1138 [2021-05-06 12:11:35,085 INFO L226 Difference]: Without dead ends: 670 [2021-05-06 12:11:35,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1120 ImplicationChecksByTransitivity, 1174.2ms TimeCoverageRelationStatistics Valid=229, Invalid=1751, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:11:35,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2021-05-06 12:11:36,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 586. [2021-05-06 12:11:36,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:36,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:36,278 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:36,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:36,278 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:36,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:36,278 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:36,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:36,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:36,279 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 13, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:36,279 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable920 [2021-05-06 12:11:36,279 INFO L428 AbstractCegarLoop]: === Iteration 201 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:36,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:36,279 INFO L82 PathProgramCache]: Analyzing trace with hash -1613293668, now seen corresponding path program 184 times [2021-05-06 12:11:36,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:36,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596789296] [2021-05-06 12:11:36,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:36,284 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:36,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,304 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:36,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:36,313 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:36,325 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:36,327 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:36,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:36,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:36,355 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:36,364 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:36,365 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:36,367 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:36,368 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,376 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:36,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:36,394 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:36,406 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:36,408 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:36,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:36,438 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:36,445 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:36,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:36,455 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:36,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:36,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:36,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:36,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:36,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:36,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:36,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:37,488 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:37,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596789296] [2021-05-06 12:11:37,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1596789296] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:37,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:37,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:11:37,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966349854] [2021-05-06 12:11:37,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:11:37,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:37,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:11:37,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1612, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:11:37,489 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:39,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:39,713 INFO L93 Difference]: Finished difference Result 1129 states and 1316 transitions. [2021-05-06 12:11:39,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:11:39,713 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:39,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:39,714 INFO L225 Difference]: With dead ends: 1129 [2021-05-06 12:11:39,714 INFO L226 Difference]: Without dead ends: 661 [2021-05-06 12:11:39,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1125 ImplicationChecksByTransitivity, 1020.3ms TimeCoverageRelationStatistics Valid=239, Invalid=1831, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:11:39,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-06 12:11:40,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 586. [2021-05-06 12:11:40,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:40,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:40,809 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:40,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:40,810 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:40,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:40,810 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:40,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:40,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:40,810 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:40,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable925 [2021-05-06 12:11:40,810 INFO L428 AbstractCegarLoop]: === Iteration 202 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:40,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:40,810 INFO L82 PathProgramCache]: Analyzing trace with hash -227090274, now seen corresponding path program 185 times [2021-05-06 12:11:40,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:40,811 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131123167] [2021-05-06 12:11:40,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:40,816 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:40,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:40,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:40,843 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:40,855 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:40,857 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:40,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:40,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:40,885 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:40,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:40,895 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:40,898 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:40,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:40,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:40,928 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:40,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:40,942 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:40,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:40,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:40,972 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:40,983 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:40,983 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:40,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:41,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:41,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:41,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:41,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:41,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:41,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:42,147 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:42,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131123167] [2021-05-06 12:11:42,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1131123167] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:42,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:42,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:11:42,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323146843] [2021-05-06 12:11:42,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:11:42,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:42,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:11:42,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1769, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:11:42,148 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:44,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:44,767 INFO L93 Difference]: Finished difference Result 1147 states and 1330 transitions. [2021-05-06 12:11:44,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:11:44,767 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:44,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:44,768 INFO L225 Difference]: With dead ends: 1147 [2021-05-06 12:11:44,768 INFO L226 Difference]: Without dead ends: 679 [2021-05-06 12:11:44,768 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 1138.0ms TimeCoverageRelationStatistics Valid=248, Invalid=1914, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:11:44,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-06 12:11:45,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 586. [2021-05-06 12:11:45,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:45,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:45,944 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:45,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:45,944 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:45,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:45,944 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:45,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:45,945 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:45,945 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:45,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable930 [2021-05-06 12:11:45,945 INFO L428 AbstractCegarLoop]: === Iteration 203 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:45,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:45,945 INFO L82 PathProgramCache]: Analyzing trace with hash -165050660, now seen corresponding path program 186 times [2021-05-06 12:11:45,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:45,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890413837] [2021-05-06 12:11:45,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:45,950 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:45,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:45,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:45,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:45,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:45,976 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:45,987 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:45,989 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:45,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:45,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:46,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:46,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:46,017 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:46,026 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:46,027 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:46,029 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:46,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:46,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:46,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:46,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:46,055 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:46,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:46,065 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:46,072 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:46,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:46,080 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:46,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:46,088 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:46,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:46,095 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:46,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:46,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:46,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:46,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:46,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:46,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:46,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:46,987 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:46,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890413837] [2021-05-06 12:11:46,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [890413837] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:46,987 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:46,987 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:11:46,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533019249] [2021-05-06 12:11:46,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:11:46,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:46,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:11:46,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=1770, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:11:46,988 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:49,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:49,396 INFO L93 Difference]: Finished difference Result 1111 states and 1298 transitions. [2021-05-06 12:11:49,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:11:49,397 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:49,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:49,398 INFO L225 Difference]: With dead ends: 1111 [2021-05-06 12:11:49,398 INFO L226 Difference]: Without dead ends: 643 [2021-05-06 12:11:49,398 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 23 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 891.4ms TimeCoverageRelationStatistics Valid=259, Invalid=1997, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:11:49,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-06 12:11:50,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 586. [2021-05-06 12:11:50,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:50,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:50,590 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:50,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:50,590 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:50,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:50,590 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:50,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:50,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:50,590 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:50,591 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable935 [2021-05-06 12:11:50,591 INFO L428 AbstractCegarLoop]: === Iteration 204 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:50,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:50,591 INFO L82 PathProgramCache]: Analyzing trace with hash -1970488994, now seen corresponding path program 187 times [2021-05-06 12:11:50,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:50,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877342121] [2021-05-06 12:11:50,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:50,596 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:50,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:50,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:50,624 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:50,635 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:50,638 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:50,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,647 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,656 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:50,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:50,665 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:50,675 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:50,676 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:50,678 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:50,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:50,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:50,706 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:50,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:50,720 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:50,720 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:50,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:50,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:50,745 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:50,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:50,756 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:50,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:50,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:50,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:50,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:50,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:50,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:50,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:52,099 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:52,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877342121] [2021-05-06 12:11:52,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1877342121] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:52,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:52,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:11:52,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306574154] [2021-05-06 12:11:52,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:11:52,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:52,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:11:52,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1852, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:11:52,101 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:54,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:54,662 INFO L93 Difference]: Finished difference Result 1102 states and 1289 transitions. [2021-05-06 12:11:54,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:11:54,662 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:54,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:54,663 INFO L225 Difference]: With dead ends: 1102 [2021-05-06 12:11:54,663 INFO L226 Difference]: Without dead ends: 634 [2021-05-06 12:11:54,663 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1162 ImplicationChecksByTransitivity, 1345.3ms TimeCoverageRelationStatistics Valid=269, Invalid=2083, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:11:54,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2021-05-06 12:11:55,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 586. [2021-05-06 12:11:55,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:55,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:11:55,739 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:11:55,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:55,739 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:11:55,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:55,739 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:11:55,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:55,740 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:55,740 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 17, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:55,740 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable940 [2021-05-06 12:11:55,740 INFO L428 AbstractCegarLoop]: === Iteration 205 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:55,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:55,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1506829852, now seen corresponding path program 188 times [2021-05-06 12:11:55,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:55,740 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545532476] [2021-05-06 12:11:55,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:55,745 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:55,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:55,766 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:55,774 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:55,785 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:55,787 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:55,788 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:55,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:55,815 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:55,824 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:55,825 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:55,827 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:55,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,846 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:55,848 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:55,855 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:55,866 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:55,869 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:55,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:55,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:55,894 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:55,903 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:55,914 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:55,915 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:55,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:55,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:55,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:55,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:55,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:55,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:55,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:57,193 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:57,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545532476] [2021-05-06 12:11:57,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1545532476] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:57,194 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:57,194 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:11:57,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73952645] [2021-05-06 12:11:57,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:11:57,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:57,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:11:57,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1936, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:11:57,195 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:59,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:59,617 INFO L93 Difference]: Finished difference Result 1093 states and 1280 transitions. [2021-05-06 12:11:59,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:11:59,617 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:59,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:59,618 INFO L225 Difference]: With dead ends: 1093 [2021-05-06 12:11:59,618 INFO L226 Difference]: Without dead ends: 625 [2021-05-06 12:11:59,619 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 13 SyntacticMatches, 20 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1095 ImplicationChecksByTransitivity, 1273.6ms TimeCoverageRelationStatistics Valid=279, Invalid=2171, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:11:59,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-06 12:12:00,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 586. [2021-05-06 12:12:00,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:00,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:12:00,711 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:12:00,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:00,711 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:12:00,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:00,711 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:12:00,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:12:00,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:00,712 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:00,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable945 [2021-05-06 12:12:00,712 INFO L428 AbstractCegarLoop]: === Iteration 206 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:00,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:00,712 INFO L82 PathProgramCache]: Analyzing trace with hash -81518050, now seen corresponding path program 189 times [2021-05-06 12:12:00,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:00,712 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754098531] [2021-05-06 12:12:00,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:00,718 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:00,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,730 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:00,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:00,746 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:00,758 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:00,760 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:00,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:00,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:00,790 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:00,800 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:00,800 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:00,803 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:00,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:00,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:00,829 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:00,841 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:00,844 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:00,844 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:00,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:00,872 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:00,882 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:00,883 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:00,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:00,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:00,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:00,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:00,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:00,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:00,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:02,233 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:02,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754098531] [2021-05-06 12:12:02,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1754098531] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:02,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:02,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:12:02,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106713972] [2021-05-06 12:12:02,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:12:02,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:02,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:12:02,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2022, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:12:02,234 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:04,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:04,887 INFO L93 Difference]: Finished difference Result 1088 states and 1275 transitions. [2021-05-06 12:12:04,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 12:12:04,887 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:04,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:04,888 INFO L225 Difference]: With dead ends: 1088 [2021-05-06 12:12:04,888 INFO L226 Difference]: Without dead ends: 620 [2021-05-06 12:12:04,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 1343.1ms TimeCoverageRelationStatistics Valid=289, Invalid=2261, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:12:04,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 620 states. [2021-05-06 12:12:06,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 620 to 586. [2021-05-06 12:12:06,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 571 states have (on average 1.1751313485113835) internal successors, (671), 574 states have internal predecessors, (671), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:06,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 688 transitions. [2021-05-06 12:12:06,035 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 688 transitions. Word has length 82 [2021-05-06 12:12:06,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:06,035 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 688 transitions. [2021-05-06 12:12:06,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:06,035 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 688 transitions. [2021-05-06 12:12:06,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:12:06,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:06,035 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:06,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable950 [2021-05-06 12:12:06,035 INFO L428 AbstractCegarLoop]: === Iteration 207 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:06,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:06,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1092635300, now seen corresponding path program 190 times [2021-05-06 12:12:06,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:06,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628225984] [2021-05-06 12:12:06,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:06,040 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:06,048 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:06,049 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:06,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:06,061 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:06,068 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:06,077 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:06,078 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:06,080 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:06,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:06,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:06,088 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:06,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:06,105 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:06,117 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:06,119 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:06,128 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:06,128 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:06,137 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:06,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:06,147 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:06,156 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:06,157 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:06,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:06,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:06,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:06,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:06,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:06,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:06,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:07,570 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:07,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628225984] [2021-05-06 12:12:07,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1628225984] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:07,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:07,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:12:07,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187621029] [2021-05-06 12:12:07,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:12:07,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:07,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:12:07,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=2110, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:12:07,571 INFO L87 Difference]: Start difference. First operand 586 states and 688 transitions. Second operand has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:10,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:10,519 INFO L93 Difference]: Finished difference Result 1102 states and 1299 transitions. [2021-05-06 12:12:10,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 12:12:10,519 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:10,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:10,520 INFO L225 Difference]: With dead ends: 1102 [2021-05-06 12:12:10,520 INFO L226 Difference]: Without dead ends: 623 [2021-05-06 12:12:10,521 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 12 SyntacticMatches, 19 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1054 ImplicationChecksByTransitivity, 1412.1ms TimeCoverageRelationStatistics Valid=299, Invalid=2353, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:12:10,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2021-05-06 12:12:11,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 598. [2021-05-06 12:12:11,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 598 states, 583 states have (on average 1.1783876500857633) internal successors, (687), 586 states have internal predecessors, (687), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:11,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 598 states to 598 states and 704 transitions. [2021-05-06 12:12:11,586 INFO L78 Accepts]: Start accepts. Automaton has 598 states and 704 transitions. Word has length 82 [2021-05-06 12:12:11,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:11,587 INFO L480 AbstractCegarLoop]: Abstraction has 598 states and 704 transitions. [2021-05-06 12:12:11,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:11,587 INFO L276 IsEmpty]: Start isEmpty. Operand 598 states and 704 transitions. [2021-05-06 12:12:11,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:11,587 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:11,587 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:11,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable954 [2021-05-06 12:12:11,587 INFO L428 AbstractCegarLoop]: === Iteration 208 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:11,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:11,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1118446753, now seen corresponding path program 191 times [2021-05-06 12:12:11,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:11,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600978071] [2021-05-06 12:12:11,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:11,593 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:11,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:11,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:11,622 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:11,633 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:11,636 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:11,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,655 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:11,658 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:11,665 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:11,675 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:11,676 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:11,678 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:11,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:11,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:11,707 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:11,719 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:11,722 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:11,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:11,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:11,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:11,751 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:11,761 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:11,762 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:11,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:11,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:11,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:11,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:11,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:11,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:11,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:12,935 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:12,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600978071] [2021-05-06 12:12:12,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [600978071] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:12,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:12,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:12:12,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710756523] [2021-05-06 12:12:12,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:12:12,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:12,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:12:12,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=891, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:12:12,936 INFO L87 Difference]: Start difference. First operand 598 states and 704 transitions. Second operand has 30 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 29 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:16,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:16,206 INFO L93 Difference]: Finished difference Result 1258 states and 1452 transitions. [2021-05-06 12:12:16,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:12:16,207 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 29 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:16,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:16,207 INFO L225 Difference]: With dead ends: 1258 [2021-05-06 12:12:16,208 INFO L226 Difference]: Without dead ends: 781 [2021-05-06 12:12:16,208 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 39 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 1193.0ms TimeCoverageRelationStatistics Valid=122, Invalid=1068, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:12:16,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2021-05-06 12:12:17,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 607. [2021-05-06 12:12:17,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:17,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:12:17,405 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:12:17,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:17,405 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:12:17,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 29 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:17,405 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:12:17,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:17,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:17,405 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:17,406 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable959 [2021-05-06 12:12:17,406 INFO L428 AbstractCegarLoop]: === Iteration 209 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:17,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:17,406 INFO L82 PathProgramCache]: Analyzing trace with hash -164506595, now seen corresponding path program 192 times [2021-05-06 12:12:17,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:17,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983517997] [2021-05-06 12:12:17,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:17,411 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:17,423 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,423 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:17,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:17,439 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:17,451 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:17,453 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:17,462 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,463 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:17,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:17,482 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:17,492 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:17,492 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:17,495 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:17,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:17,504 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:17,520 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:17,532 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:17,534 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:17,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:17,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:17,562 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:17,572 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:17,572 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:17,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:17,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:17,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:17,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:17,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:17,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:17,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:18,753 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:18,753 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983517997] [2021-05-06 12:12:18,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [983517997] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:18,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:18,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:12:18,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824768588] [2021-05-06 12:12:18,754 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:12:18,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:18,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:12:18,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:12:18,754 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 31 states, 31 states have (on average 2.5483870967741935) internal successors, (79), 30 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:22,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:22,135 INFO L93 Difference]: Finished difference Result 1276 states and 1470 transitions. [2021-05-06 12:12:22,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:12:22,136 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.5483870967741935) internal successors, (79), 30 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:22,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:22,136 INFO L225 Difference]: With dead ends: 1276 [2021-05-06 12:12:22,136 INFO L226 Difference]: Without dead ends: 790 [2021-05-06 12:12:22,137 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 38 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 1187.7ms TimeCoverageRelationStatistics Valid=132, Invalid=1128, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:12:22,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 790 states. [2021-05-06 12:12:23,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 790 to 607. [2021-05-06 12:12:23,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:23,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:12:23,457 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:12:23,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:23,457 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:12:23,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.5483870967741935) internal successors, (79), 30 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:23,457 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:12:23,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:23,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:23,458 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:23,458 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable964 [2021-05-06 12:12:23,458 INFO L428 AbstractCegarLoop]: === Iteration 210 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:23,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:23,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1850686433, now seen corresponding path program 193 times [2021-05-06 12:12:23,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:23,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012216429] [2021-05-06 12:12:23,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:23,464 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:23,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:23,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:23,493 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:23,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:23,507 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:23,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,527 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:23,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:23,538 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:23,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:23,548 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:23,551 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:23,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:23,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:23,579 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:23,590 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:23,593 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:23,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:23,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:23,620 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:23,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:23,631 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:23,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:23,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:23,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:23,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:23,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:23,673 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:23,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:24,833 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:24,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012216429] [2021-05-06 12:12:24,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2012216429] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:24,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:24,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:12:24,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627750224] [2021-05-06 12:12:24,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:12:24,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:24,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:12:24,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:12:24,834 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 32 states, 32 states have (on average 2.46875) internal successors, (79), 31 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:28,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:28,373 INFO L93 Difference]: Finished difference Result 1267 states and 1461 transitions. [2021-05-06 12:12:28,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:12:28,374 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.46875) internal successors, (79), 31 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:28,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:28,375 INFO L225 Difference]: With dead ends: 1267 [2021-05-06 12:12:28,375 INFO L226 Difference]: Without dead ends: 781 [2021-05-06 12:12:28,375 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 13 SyntacticMatches, 36 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 1210.9ms TimeCoverageRelationStatistics Valid=142, Invalid=1190, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:12:28,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2021-05-06 12:12:29,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 607. [2021-05-06 12:12:29,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:29,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:12:29,717 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:12:29,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:29,717 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:12:29,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.46875) internal successors, (79), 31 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:29,717 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:12:29,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:29,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:29,717 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:29,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable969 [2021-05-06 12:12:29,717 INFO L428 AbstractCegarLoop]: === Iteration 211 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:29,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:29,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1171414179, now seen corresponding path program 194 times [2021-05-06 12:12:29,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:29,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924428857] [2021-05-06 12:12:29,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:29,723 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:29,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:29,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:29,751 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:29,763 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:29,765 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:29,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:29,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:29,794 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:29,804 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:29,805 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:29,808 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:29,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:29,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:29,837 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:29,849 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:29,852 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:29,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:29,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:29,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:29,880 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:29,891 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:29,891 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:29,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:29,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:29,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:29,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:29,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:29,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:29,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:31,082 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:31,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924428857] [2021-05-06 12:12:31,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1924428857] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:31,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:31,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:12:31,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47122361] [2021-05-06 12:12:31,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:12:31,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:31,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:12:31,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1065, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:12:31,083 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 33 states, 33 states have (on average 2.393939393939394) internal successors, (79), 32 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:34,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:34,747 INFO L93 Difference]: Finished difference Result 1258 states and 1452 transitions. [2021-05-06 12:12:34,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:12:34,747 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.393939393939394) internal successors, (79), 32 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:34,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:34,748 INFO L225 Difference]: With dead ends: 1258 [2021-05-06 12:12:34,748 INFO L226 Difference]: Without dead ends: 772 [2021-05-06 12:12:34,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 16 SyntacticMatches, 32 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 1192.8ms TimeCoverageRelationStatistics Valid=152, Invalid=1254, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:12:34,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2021-05-06 12:12:36,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 607. [2021-05-06 12:12:36,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:36,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:12:36,077 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:12:36,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:36,077 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:12:36,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.393939393939394) internal successors, (79), 32 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:36,077 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:12:36,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:36,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:36,078 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:36,078 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable974 [2021-05-06 12:12:36,078 INFO L428 AbstractCegarLoop]: === Iteration 212 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:36,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:36,078 INFO L82 PathProgramCache]: Analyzing trace with hash -610714401, now seen corresponding path program 195 times [2021-05-06 12:12:36,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:36,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244803728] [2021-05-06 12:12:36,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:36,084 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:36,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:36,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:36,114 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:36,126 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:36,128 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:36,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,139 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:36,142 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:36,157 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:36,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:36,168 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:36,170 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:36,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:36,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:36,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:36,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:36,214 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:36,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:36,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:36,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:36,244 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:36,254 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:36,254 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:36,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:36,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:36,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:36,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:36,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:36,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:36,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:37,435 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:37,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244803728] [2021-05-06 12:12:37,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1244803728] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:37,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:37,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:12:37,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657386915] [2021-05-06 12:12:37,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:12:37,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:37,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:12:37,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:12:37,436 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 34 states, 34 states have (on average 2.323529411764706) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:41,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:41,056 INFO L93 Difference]: Finished difference Result 1249 states and 1443 transitions. [2021-05-06 12:12:41,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:12:41,056 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.323529411764706) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:41,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:41,057 INFO L225 Difference]: With dead ends: 1249 [2021-05-06 12:12:41,057 INFO L226 Difference]: Without dead ends: 763 [2021-05-06 12:12:41,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 35 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 913 ImplicationChecksByTransitivity, 1181.2ms TimeCoverageRelationStatistics Valid=162, Invalid=1320, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:12:41,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 763 states. [2021-05-06 12:12:42,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 763 to 607. [2021-05-06 12:12:42,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:42,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:12:42,393 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:12:42,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:42,393 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:12:42,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.323529411764706) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:42,393 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:12:42,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:42,393 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:42,393 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:42,393 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable979 [2021-05-06 12:12:42,393 INFO L428 AbstractCegarLoop]: === Iteration 213 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:42,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:42,394 INFO L82 PathProgramCache]: Analyzing trace with hash -570039651, now seen corresponding path program 196 times [2021-05-06 12:12:42,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:42,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7667447] [2021-05-06 12:12:42,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:42,399 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:42,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,412 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:42,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:42,430 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:42,442 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:42,444 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:42,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,454 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:42,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:42,474 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:42,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:42,485 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:42,487 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:42,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:42,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:42,515 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:42,527 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:42,530 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:42,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:42,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:42,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:42,559 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:42,569 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:42,569 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:42,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:42,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:42,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:42,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:42,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:42,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:42,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:43,821 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:43,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7667447] [2021-05-06 12:12:43,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [7667447] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:43,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:43,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:12:43,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452919192] [2021-05-06 12:12:43,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:12:43,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:43,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:12:43,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1191, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:12:43,822 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 34 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:47,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:47,207 INFO L93 Difference]: Finished difference Result 1240 states and 1434 transitions. [2021-05-06 12:12:47,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:12:47,208 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 34 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:47,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:47,209 INFO L225 Difference]: With dead ends: 1240 [2021-05-06 12:12:47,209 INFO L226 Difference]: Without dead ends: 754 [2021-05-06 12:12:47,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 34 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 1245.4ms TimeCoverageRelationStatistics Valid=172, Invalid=1388, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:12:47,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-05-06 12:12:48,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 607. [2021-05-06 12:12:48,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:48,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:12:48,524 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:12:48,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:48,524 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:12:48,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 34 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:48,524 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:12:48,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:48,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:48,525 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:48,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable984 [2021-05-06 12:12:48,525 INFO L428 AbstractCegarLoop]: === Iteration 214 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:48,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:48,525 INFO L82 PathProgramCache]: Analyzing trace with hash -126138977, now seen corresponding path program 197 times [2021-05-06 12:12:48,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:48,525 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [207441093] [2021-05-06 12:12:48,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:48,531 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:48,542 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:48,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:48,559 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:48,571 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:48,573 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:48,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:48,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:48,601 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:48,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:48,611 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:48,613 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:48,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:48,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:48,641 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:48,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:48,655 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:48,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:48,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:48,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:48,683 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:48,693 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:48,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:48,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:48,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:48,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:48,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:48,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:48,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:48,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:49,948 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:49,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [207441093] [2021-05-06 12:12:49,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [207441093] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:49,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:49,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:12:49,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889595405] [2021-05-06 12:12:49,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:12:49,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:49,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:12:49,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1257, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:12:49,949 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:53,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:53,133 INFO L93 Difference]: Finished difference Result 1231 states and 1425 transitions. [2021-05-06 12:12:53,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:12:53,134 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:53,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:53,134 INFO L225 Difference]: With dead ends: 1231 [2021-05-06 12:12:53,134 INFO L226 Difference]: Without dead ends: 745 [2021-05-06 12:12:53,135 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 33 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 1258.4ms TimeCoverageRelationStatistics Valid=182, Invalid=1458, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:12:53,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2021-05-06 12:12:54,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 607. [2021-05-06 12:12:54,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:54,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:12:54,501 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:12:54,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:54,501 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:12:54,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:54,502 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:12:54,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:54,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:54,502 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:54,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable989 [2021-05-06 12:12:54,502 INFO L428 AbstractCegarLoop]: === Iteration 215 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:54,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:54,502 INFO L82 PathProgramCache]: Analyzing trace with hash -607219235, now seen corresponding path program 198 times [2021-05-06 12:12:54,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:54,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385094588] [2021-05-06 12:12:54,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:54,508 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:54,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,527 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:54,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:54,537 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:54,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:54,550 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:54,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:54,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:54,580 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:54,589 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:54,590 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:54,592 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:54,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:54,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:54,619 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:54,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:54,633 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:54,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:54,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:54,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:54,663 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:54,673 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:54,673 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:54,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:54,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:54,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:54,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:54,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:54,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:54,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:55,934 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:55,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385094588] [2021-05-06 12:12:55,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1385094588] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:55,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:55,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:12:55,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755079147] [2021-05-06 12:12:55,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:12:55,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:55,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:12:55,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1325, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:12:55,935 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:59,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:59,064 INFO L93 Difference]: Finished difference Result 1222 states and 1416 transitions. [2021-05-06 12:12:59,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:12:59,065 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:59,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:59,065 INFO L225 Difference]: With dead ends: 1222 [2021-05-06 12:12:59,065 INFO L226 Difference]: Without dead ends: 736 [2021-05-06 12:12:59,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 32 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1120 ImplicationChecksByTransitivity, 1263.8ms TimeCoverageRelationStatistics Valid=192, Invalid=1530, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:12:59,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 736 states. [2021-05-06 12:13:00,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 736 to 607. [2021-05-06 12:13:00,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:00,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:00,416 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:00,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:00,416 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:00,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:00,416 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:00,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:00,417 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:00,417 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:00,417 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable994 [2021-05-06 12:13:00,417 INFO L428 AbstractCegarLoop]: === Iteration 216 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:00,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:00,417 INFO L82 PathProgramCache]: Analyzing trace with hash -960307617, now seen corresponding path program 199 times [2021-05-06 12:13:00,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:00,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150286337] [2021-05-06 12:13:00,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:00,422 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:00,423 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:00,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:00,450 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:00,461 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:00,464 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:00,464 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,474 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:00,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:00,492 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:00,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:00,503 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:00,505 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:00,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:00,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:00,531 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:00,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:00,546 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:00,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:00,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:00,559 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:00,573 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:00,583 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:00,584 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:00,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:00,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:00,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:00,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:00,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:00,626 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:00,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:01,856 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:01,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150286337] [2021-05-06 12:13:01,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [150286337] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:01,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:01,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:13:01,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322926642] [2021-05-06 12:13:01,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:13:01,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:01,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:13:01,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1395, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:13:01,857 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:04,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:04,894 INFO L93 Difference]: Finished difference Result 1213 states and 1407 transitions. [2021-05-06 12:13:04,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:13:04,895 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:04,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:04,895 INFO L225 Difference]: With dead ends: 1213 [2021-05-06 12:13:04,896 INFO L226 Difference]: Without dead ends: 727 [2021-05-06 12:13:04,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 31 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1171 ImplicationChecksByTransitivity, 1276.1ms TimeCoverageRelationStatistics Valid=202, Invalid=1604, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:13:04,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 727 states. [2021-05-06 12:13:06,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 727 to 607. [2021-05-06 12:13:06,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:06,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:06,271 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:06,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:06,271 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:06,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:06,271 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:06,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:06,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:06,272 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:06,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable999 [2021-05-06 12:13:06,272 INFO L428 AbstractCegarLoop]: === Iteration 217 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:06,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:06,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1285271837, now seen corresponding path program 200 times [2021-05-06 12:13:06,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:06,272 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897496636] [2021-05-06 12:13:06,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:06,277 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:06,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:06,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:06,303 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:06,314 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:06,316 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:06,324 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:06,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:06,343 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:06,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:06,352 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:06,354 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:06,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:06,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:06,381 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:06,391 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:06,393 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:06,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:06,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:06,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:06,419 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:06,428 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:06,428 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:06,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:06,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:06,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:06,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:06,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:06,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:06,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:07,505 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:07,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897496636] [2021-05-06 12:13:07,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [897496636] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:07,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:07,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:13:07,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891405455] [2021-05-06 12:13:07,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:13:07,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:07,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:13:07,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1467, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:13:07,506 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:10,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:10,319 INFO L93 Difference]: Finished difference Result 1204 states and 1398 transitions. [2021-05-06 12:13:10,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:13:10,319 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:10,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:10,320 INFO L225 Difference]: With dead ends: 1204 [2021-05-06 12:13:10,320 INFO L226 Difference]: Without dead ends: 718 [2021-05-06 12:13:10,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 30 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1069.4ms TimeCoverageRelationStatistics Valid=212, Invalid=1680, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:13:10,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 718 states. [2021-05-06 12:13:11,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 718 to 607. [2021-05-06 12:13:11,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:11,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:11,725 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:11,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:11,725 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:11,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:11,726 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:11,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:11,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:11,726 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:11,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1004 [2021-05-06 12:13:11,726 INFO L428 AbstractCegarLoop]: === Iteration 218 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:11,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:11,726 INFO L82 PathProgramCache]: Analyzing trace with hash 1708918559, now seen corresponding path program 201 times [2021-05-06 12:13:11,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:11,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363376948] [2021-05-06 12:13:11,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:11,731 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:11,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:11,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:11,756 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:11,768 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:11,770 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:11,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:11,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:11,795 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:11,804 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:11,805 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:11,807 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:11,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:11,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:11,832 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:11,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:11,845 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:11,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:11,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:11,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:11,871 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:11,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:11,881 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:11,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:12,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:12,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:12,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:12,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:12,017 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:12,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:13,493 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:13,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363376948] [2021-05-06 12:13:13,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1363376948] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:13,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:13,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:13:13,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264002343] [2021-05-06 12:13:13,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:13:13,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:13,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:13:13,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=1917, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:13:13,494 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:16,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:16,732 INFO L93 Difference]: Finished difference Result 1196 states and 1386 transitions. [2021-05-06 12:13:16,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:13:16,733 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:16,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:16,733 INFO L225 Difference]: With dead ends: 1196 [2021-05-06 12:13:16,733 INFO L226 Difference]: Without dead ends: 710 [2021-05-06 12:13:16,734 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 7 SyntacticMatches, 28 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1385 ImplicationChecksByTransitivity, 1598.7ms TimeCoverageRelationStatistics Valid=311, Invalid=2239, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:13:16,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 710 states. [2021-05-06 12:13:18,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 710 to 607. [2021-05-06 12:13:18,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:18,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:18,118 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:18,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:18,118 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:18,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:18,118 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:18,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:18,119 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:18,119 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:18,119 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1009 [2021-05-06 12:13:18,119 INFO L428 AbstractCegarLoop]: === Iteration 219 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:18,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:18,119 INFO L82 PathProgramCache]: Analyzing trace with hash 679559261, now seen corresponding path program 202 times [2021-05-06 12:13:18,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:18,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738099577] [2021-05-06 12:13:18,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:18,124 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:18,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:18,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:18,153 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:18,164 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,166 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:18,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,185 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:18,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:18,195 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:18,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,205 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:18,208 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:18,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,216 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:18,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:18,234 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:18,246 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,248 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:18,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,259 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:18,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:18,276 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:18,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,287 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:18,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:18,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:18,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:18,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:18,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:18,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:18,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:19,572 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:19,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738099577] [2021-05-06 12:13:19,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [738099577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:19,572 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:19,572 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:13:19,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963523514] [2021-05-06 12:13:19,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:13:19,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:19,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:13:19,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1617, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:13:19,573 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:22,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:22,330 INFO L93 Difference]: Finished difference Result 1186 states and 1380 transitions. [2021-05-06 12:13:22,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:13:22,331 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:22,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:22,331 INFO L225 Difference]: With dead ends: 1186 [2021-05-06 12:13:22,332 INFO L226 Difference]: Without dead ends: 700 [2021-05-06 12:13:22,332 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 15 SyntacticMatches, 25 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 1288.1ms TimeCoverageRelationStatistics Valid=232, Invalid=1838, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:13:22,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2021-05-06 12:13:23,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 607. [2021-05-06 12:13:23,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:23,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:23,722 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:23,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:23,722 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:23,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:23,722 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:23,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:23,722 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:23,723 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:23,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1014 [2021-05-06 12:13:23,723 INFO L428 AbstractCegarLoop]: === Iteration 220 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:23,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:23,723 INFO L82 PathProgramCache]: Analyzing trace with hash -164446241, now seen corresponding path program 203 times [2021-05-06 12:13:23,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:23,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680674506] [2021-05-06 12:13:23,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:23,728 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:23,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:23,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:23,756 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:23,775 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:23,778 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:23,778 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,779 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,788 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:23,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:23,805 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:23,815 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:23,815 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:23,818 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:23,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:23,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:23,843 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:23,855 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:23,857 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:23,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:23,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:23,885 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:23,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:23,895 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:23,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:23,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:23,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:23,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:23,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:23,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:23,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:25,195 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:25,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680674506] [2021-05-06 12:13:25,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [680674506] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:25,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:25,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:13:25,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599135931] [2021-05-06 12:13:25,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:13:25,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:25,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:13:25,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1774, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:13:25,196 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:28,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:28,459 INFO L93 Difference]: Finished difference Result 1202 states and 1392 transitions. [2021-05-06 12:13:28,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:13:28,459 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:28,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:28,460 INFO L225 Difference]: With dead ends: 1202 [2021-05-06 12:13:28,460 INFO L226 Difference]: Without dead ends: 716 [2021-05-06 12:13:28,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 13 SyntacticMatches, 26 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1292 ImplicationChecksByTransitivity, 1273.5ms TimeCoverageRelationStatistics Valid=241, Invalid=1921, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:13:28,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2021-05-06 12:13:29,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 607. [2021-05-06 12:13:29,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:29,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:29,858 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:29,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:29,858 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:29,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:29,858 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:29,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:29,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:29,858 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:29,859 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1019 [2021-05-06 12:13:29,859 INFO L428 AbstractCegarLoop]: === Iteration 221 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:29,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:29,859 INFO L82 PathProgramCache]: Analyzing trace with hash 110313373, now seen corresponding path program 204 times [2021-05-06 12:13:29,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:29,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446061841] [2021-05-06 12:13:29,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:29,864 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:29,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:29,877 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:29,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:29,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:29,901 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:29,913 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:29,915 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:29,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:29,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:29,935 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:29,938 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:29,946 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:29,956 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:29,956 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:29,959 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:29,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:29,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:29,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:29,981 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:29,989 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:30,000 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:30,003 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:30,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:30,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:30,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:30,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:30,031 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:30,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:30,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:30,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:30,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:30,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:30,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:30,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:30,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:30,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:31,314 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:31,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446061841] [2021-05-06 12:13:31,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [446061841] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:31,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:31,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:13:31,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820753971] [2021-05-06 12:13:31,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:13:31,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:31,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:13:31,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1775, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:13:31,315 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:33,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:33,824 INFO L93 Difference]: Finished difference Result 1168 states and 1362 transitions. [2021-05-06 12:13:33,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:13:33,824 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:33,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:33,825 INFO L225 Difference]: With dead ends: 1168 [2021-05-06 12:13:33,825 INFO L226 Difference]: Without dead ends: 682 [2021-05-06 12:13:33,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 13 SyntacticMatches, 25 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1257 ImplicationChecksByTransitivity, 1267.1ms TimeCoverageRelationStatistics Valid=252, Invalid=2004, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:13:33,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-05-06 12:13:35,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 607. [2021-05-06 12:13:35,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:35,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:35,165 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:35,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:35,165 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:35,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:35,165 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:35,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:35,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:35,165 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:35,165 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1024 [2021-05-06 12:13:35,165 INFO L428 AbstractCegarLoop]: === Iteration 222 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:35,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:35,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1496516767, now seen corresponding path program 205 times [2021-05-06 12:13:35,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:35,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684534717] [2021-05-06 12:13:35,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:35,171 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:35,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:35,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:35,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:35,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:35,213 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:35,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:35,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:35,240 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:35,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:35,250 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:35,253 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:35,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:35,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:35,280 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:35,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:35,294 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:35,294 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:35,304 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:35,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:35,321 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:35,331 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:35,331 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:35,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:35,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:35,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:35,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:35,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:35,374 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:35,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:36,675 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:36,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684534717] [2021-05-06 12:13:36,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [684534717] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:36,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:36,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:13:36,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238830103] [2021-05-06 12:13:36,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:13:36,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:36,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:13:36,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1857, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:13:36,676 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:39,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:39,474 INFO L93 Difference]: Finished difference Result 1159 states and 1353 transitions. [2021-05-06 12:13:39,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:13:39,475 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:39,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:39,475 INFO L225 Difference]: With dead ends: 1159 [2021-05-06 12:13:39,475 INFO L226 Difference]: Without dead ends: 673 [2021-05-06 12:13:39,476 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1216 ImplicationChecksByTransitivity, 1344.6ms TimeCoverageRelationStatistics Valid=262, Invalid=2090, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:13:39,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-05-06 12:13:40,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 607. [2021-05-06 12:13:40,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:40,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:40,892 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:40,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:40,892 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:40,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:40,892 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:40,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:40,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:40,892 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:40,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1029 [2021-05-06 12:13:40,893 INFO L428 AbstractCegarLoop]: === Iteration 223 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:40,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:40,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1558556381, now seen corresponding path program 206 times [2021-05-06 12:13:40,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:40,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290582435] [2021-05-06 12:13:40,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:40,898 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:40,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:40,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:40,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:40,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:40,928 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:40,939 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:40,942 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:40,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:40,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:40,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:40,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:40,970 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:40,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:40,980 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:40,982 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:40,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:40,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:41,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:41,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:41,010 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:41,021 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:41,024 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:41,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:41,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:41,043 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:41,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:41,053 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:41,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:41,064 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:41,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:41,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:41,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:41,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:41,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:41,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:41,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:42,462 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:42,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290582435] [2021-05-06 12:13:42,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [290582435] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:42,462 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:42,462 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:13:42,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518801155] [2021-05-06 12:13:42,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:13:42,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:42,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:13:42,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1941, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:13:42,463 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:45,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:45,264 INFO L93 Difference]: Finished difference Result 1150 states and 1344 transitions. [2021-05-06 12:13:45,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:13:45,265 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:45,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:45,265 INFO L225 Difference]: With dead ends: 1150 [2021-05-06 12:13:45,265 INFO L226 Difference]: Without dead ends: 664 [2021-05-06 12:13:45,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1276 ImplicationChecksByTransitivity, 1400.4ms TimeCoverageRelationStatistics Valid=272, Invalid=2178, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:13:45,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2021-05-06 12:13:46,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 607. [2021-05-06 12:13:46,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:46,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:46,626 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:46,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:46,626 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:46,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:46,626 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:46,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:46,627 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:46,627 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:46,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1034 [2021-05-06 12:13:46,627 INFO L428 AbstractCegarLoop]: === Iteration 224 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:46,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:46,627 INFO L82 PathProgramCache]: Analyzing trace with hash -246881953, now seen corresponding path program 207 times [2021-05-06 12:13:46,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:46,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696895523] [2021-05-06 12:13:46,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:46,632 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:46,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:46,642 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:46,659 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:46,671 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:46,673 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:46,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,683 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:46,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:46,701 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:46,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:46,711 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:46,713 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:46,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:46,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:46,741 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:46,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:46,755 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:46,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:46,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:46,783 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:46,792 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:46,793 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:46,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:46,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:46,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:46,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:46,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:46,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:46,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:48,621 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:48,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696895523] [2021-05-06 12:13:48,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [696895523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:48,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:48,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 12:13:48,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366394130] [2021-05-06 12:13:48,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 12:13:48,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:48,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 12:13:48,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=2463, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:13:48,622 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:52,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:52,252 INFO L93 Difference]: Finished difference Result 1184 states and 1374 transitions. [2021-05-06 12:13:52,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 12:13:52,252 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:52,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:52,253 INFO L225 Difference]: With dead ends: 1184 [2021-05-06 12:13:52,253 INFO L226 Difference]: Without dead ends: 698 [2021-05-06 12:13:52,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 7 SyntacticMatches, 22 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1375 ImplicationChecksByTransitivity, 1849.9ms TimeCoverageRelationStatistics Valid=383, Invalid=2809, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 12:13:52,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2021-05-06 12:13:53,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 607. [2021-05-06 12:13:53,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:53,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:53,644 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:53,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:53,645 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:53,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:53,645 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:53,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:53,645 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:53,645 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:53,645 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1039 [2021-05-06 12:13:53,645 INFO L428 AbstractCegarLoop]: === Iteration 225 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:53,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:53,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1064530403, now seen corresponding path program 208 times [2021-05-06 12:13:53,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:53,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196891331] [2021-05-06 12:13:53,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:53,651 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:53,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,660 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:53,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:53,678 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:53,690 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:53,692 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:53,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:53,714 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:53,721 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:53,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:53,731 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:53,734 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:53,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,742 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:53,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:53,761 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:53,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:53,775 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:53,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,784 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:53,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:53,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:53,803 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:53,812 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:53,813 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:53,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:53,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:53,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:53,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:53,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:53,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:53,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:55,235 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:55,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196891331] [2021-05-06 12:13:55,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [196891331] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:55,236 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:55,236 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:13:55,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093341126] [2021-05-06 12:13:55,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:13:55,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:55,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:13:55,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=2115, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:13:55,236 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:57,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:57,986 INFO L93 Difference]: Finished difference Result 1132 states and 1326 transitions. [2021-05-06 12:13:57,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 12:13:57,987 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:57,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:57,988 INFO L225 Difference]: With dead ends: 1132 [2021-05-06 12:13:57,988 INFO L226 Difference]: Without dead ends: 646 [2021-05-06 12:13:57,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1421.7ms TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:13:57,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-06 12:13:59,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 607. [2021-05-06 12:13:59,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:59,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:13:59,411 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:13:59,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:59,411 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:13:59,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:59,411 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:13:59,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:59,411 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:59,411 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:59,411 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1044 [2021-05-06 12:13:59,411 INFO L428 AbstractCegarLoop]: === Iteration 226 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:59,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:59,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1642088991, now seen corresponding path program 209 times [2021-05-06 12:13:59,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:59,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [314098804] [2021-05-06 12:13:59,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:59,417 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:59,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:59,427 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:59,442 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:59,453 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:59,455 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:59,463 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,464 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:59,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:59,481 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:59,490 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:59,491 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:59,493 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:59,503 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:59,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:59,519 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:59,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:59,533 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:59,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:59,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:59,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:59,557 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:59,567 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:59,567 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:59,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:59,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:59,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:59,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:59,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:59,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:59,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:00,791 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:00,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [314098804] [2021-05-06 12:14:00,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [314098804] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:00,791 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:00,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:14:00,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874319681] [2021-05-06 12:14:00,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:14:00,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:00,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:14:00,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=2205, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:14:00,792 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:02,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:02,966 INFO L93 Difference]: Finished difference Result 1127 states and 1321 transitions. [2021-05-06 12:14:02,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 12:14:02,967 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:02,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:02,967 INFO L225 Difference]: With dead ends: 1127 [2021-05-06 12:14:02,967 INFO L226 Difference]: Without dead ends: 641 [2021-05-06 12:14:02,968 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 1209.0ms TimeCoverageRelationStatistics Valid=302, Invalid=2454, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:14:02,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-05-06 12:14:04,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 607. [2021-05-06 12:14:04,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 607 states, 592 states have (on average 1.1756756756756757) internal successors, (696), 595 states have internal predecessors, (696), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:04,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 713 transitions. [2021-05-06 12:14:04,380 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 713 transitions. Word has length 85 [2021-05-06 12:14:04,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:04,380 INFO L480 AbstractCegarLoop]: Abstraction has 607 states and 713 transitions. [2021-05-06 12:14:04,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:04,380 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 713 transitions. [2021-05-06 12:14:04,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:14:04,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:04,381 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:04,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1049 [2021-05-06 12:14:04,381 INFO L428 AbstractCegarLoop]: === Iteration 227 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:04,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:04,381 INFO L82 PathProgramCache]: Analyzing trace with hash 630971741, now seen corresponding path program 210 times [2021-05-06 12:14:04,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:04,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145373745] [2021-05-06 12:14:04,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:04,385 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:04,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:04,407 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:04,414 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:04,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:04,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:04,427 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:04,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:04,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:04,453 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:04,465 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:04,467 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:04,468 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:04,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:04,496 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:04,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:04,506 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:04,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:04,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:04,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:04,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:04,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:04,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:04,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:06,038 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:06,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145373745] [2021-05-06 12:14:06,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1145373745] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:06,039 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:06,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 12:14:06,039 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917331530] [2021-05-06 12:14:06,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 12:14:06,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:06,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 12:14:06,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=2297, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:14:06,039 INFO L87 Difference]: Start difference. First operand 607 states and 713 transitions. Second operand has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:08,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:08,394 INFO L93 Difference]: Finished difference Result 1141 states and 1345 transitions. [2021-05-06 12:14:08,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 12:14:08,395 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:08,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:08,396 INFO L225 Difference]: With dead ends: 1141 [2021-05-06 12:14:08,396 INFO L226 Difference]: Without dead ends: 644 [2021-05-06 12:14:08,396 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 12 SyntacticMatches, 20 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1138 ImplicationChecksByTransitivity, 1539.0ms TimeCoverageRelationStatistics Valid=312, Invalid=2550, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:14:08,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-06 12:14:09,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 619. [2021-05-06 12:14:09,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 604 states have (on average 1.1788079470198676) internal successors, (712), 607 states have internal predecessors, (712), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:09,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 729 transitions. [2021-05-06 12:14:09,757 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 729 transitions. Word has length 85 [2021-05-06 12:14:09,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:09,757 INFO L480 AbstractCegarLoop]: Abstraction has 619 states and 729 transitions. [2021-05-06 12:14:09,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:09,757 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 729 transitions. [2021-05-06 12:14:09,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 12:14:09,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:09,757 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:09,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1053 [2021-05-06 12:14:09,757 INFO L428 AbstractCegarLoop]: === Iteration 228 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:09,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:09,758 INFO L82 PathProgramCache]: Analyzing trace with hash 1110998131, now seen corresponding path program 9 times [2021-05-06 12:14:09,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:09,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778645582] [2021-05-06 12:14:09,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:09,769 WARN L240 tifierPushTermWalker]: treesize reduction 54, result has 57.5 percent of original size [2021-05-06 12:14:09,806 WARN L245 tifierPushTermWalker]: treesize reduction 54, result has 57.5 percent of original size 73 [2021-05-06 12:14:09,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:09,839 WARN L240 tifierPushTermWalker]: treesize reduction 58, result has 57.7 percent of original size [2021-05-06 12:14:09,869 WARN L245 tifierPushTermWalker]: treesize reduction 58, result has 57.7 percent of original size 79 [2021-05-06 12:14:09,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:09,875 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:09,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:09,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:09,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:09,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:09,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:09,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:10,271 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:10,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778645582] [2021-05-06 12:14:10,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [778645582] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:10,271 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:10,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:14:10,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428739183] [2021-05-06 12:14:10,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:14:10,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:10,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:14:10,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=431, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:14:10,272 INFO L87 Difference]: Start difference. First operand 619 states and 729 transitions. Second operand has 25 states, 25 states have (on average 2.96) internal successors, (74), 24 states have internal predecessors, (74), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:14:12,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:12,199 INFO L93 Difference]: Finished difference Result 1143 states and 1341 transitions. [2021-05-06 12:14:12,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:14:12,199 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.96) internal successors, (74), 24 states have internal predecessors, (74), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 87 [2021-05-06 12:14:12,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:12,200 INFO L225 Difference]: With dead ends: 1143 [2021-05-06 12:14:12,200 INFO L226 Difference]: Without dead ends: 639 [2021-05-06 12:14:12,201 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 24 SyntacticMatches, 18 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 490.2ms TimeCoverageRelationStatistics Valid=353, Invalid=837, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:14:12,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-05-06 12:14:13,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 631. [2021-05-06 12:14:13,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.1753246753246753) internal successors, (724), 619 states have internal predecessors, (724), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:13,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 741 transitions. [2021-05-06 12:14:13,561 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 741 transitions. Word has length 87 [2021-05-06 12:14:13,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:13,561 INFO L480 AbstractCegarLoop]: Abstraction has 631 states and 741 transitions. [2021-05-06 12:14:13,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.96) internal successors, (74), 24 states have internal predecessors, (74), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:14:13,561 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 741 transitions. [2021-05-06 12:14:13,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:13,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:13,561 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:13,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1054 [2021-05-06 12:14:13,561 INFO L428 AbstractCegarLoop]: === Iteration 229 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:13,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:13,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1492238652, now seen corresponding path program 211 times [2021-05-06 12:14:13,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:13,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173383884] [2021-05-06 12:14:13,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:13,567 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:13,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:13,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:13,596 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:13,608 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:13,610 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:13,619 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,620 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:13,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:13,639 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:13,649 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:13,649 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:13,652 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:13,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,660 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:13,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:13,679 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:13,690 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:13,693 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:13,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:13,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:13,721 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:13,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:13,732 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:13,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:13,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:13,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:13,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:13,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:13,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:13,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:14,985 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:14,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173383884] [2021-05-06 12:14:14,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [173383884] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:14,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:14,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:14:14,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147021529] [2021-05-06 12:14:14,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:14:14,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:14,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:14:14,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=952, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:14:14,986 INFO L87 Difference]: Start difference. First operand 631 states and 741 transitions. Second operand has 31 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 30 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:18,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:18,828 INFO L93 Difference]: Finished difference Result 1327 states and 1528 transitions. [2021-05-06 12:14:18,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:14:18,828 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 30 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:18,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:18,829 INFO L225 Difference]: With dead ends: 1327 [2021-05-06 12:14:18,829 INFO L226 Difference]: Without dead ends: 823 [2021-05-06 12:14:18,830 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 14 SyntacticMatches, 39 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 519 ImplicationChecksByTransitivity, 1259.2ms TimeCoverageRelationStatistics Valid=125, Invalid=1135, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:14:18,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 823 states. [2021-05-06 12:14:20,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 823 to 640. [2021-05-06 12:14:20,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:20,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:14:20,302 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:14:20,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:20,302 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:14:20,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 30 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:20,302 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:14:20,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:20,303 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:20,303 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:20,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1059 [2021-05-06 12:14:20,303 INFO L428 AbstractCegarLoop]: === Iteration 230 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:20,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:20,303 INFO L82 PathProgramCache]: Analyzing trace with hash 524887998, now seen corresponding path program 212 times [2021-05-06 12:14:20,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:20,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285800991] [2021-05-06 12:14:20,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:20,313 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:20,313 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:20,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:20,338 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:20,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:20,362 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:20,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:20,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:20,390 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:20,400 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:20,400 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:20,402 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:20,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,421 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:20,423 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:20,446 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:20,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:20,462 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:20,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:20,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:20,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:20,494 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:20,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:20,506 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:20,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:20,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:20,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:20,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:20,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:20,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:20,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:21,753 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:21,753 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285800991] [2021-05-06 12:14:21,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [285800991] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:21,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:21,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:14:21,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525505096] [2021-05-06 12:14:21,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:14:21,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:21,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:14:21,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1010, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:14:21,754 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 32 states, 32 states have (on average 2.5625) internal successors, (82), 31 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:25,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:25,731 INFO L93 Difference]: Finished difference Result 1345 states and 1546 transitions. [2021-05-06 12:14:25,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:14:25,731 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.5625) internal successors, (82), 31 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:25,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:25,732 INFO L225 Difference]: With dead ends: 1345 [2021-05-06 12:14:25,732 INFO L226 Difference]: Without dead ends: 832 [2021-05-06 12:14:25,733 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 40 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 655 ImplicationChecksByTransitivity, 1252.5ms TimeCoverageRelationStatistics Valid=135, Invalid=1197, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:14:25,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 832 states. [2021-05-06 12:14:27,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 832 to 640. [2021-05-06 12:14:27,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:27,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:14:27,317 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:14:27,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:27,317 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:14:27,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.5625) internal successors, (82), 31 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:27,317 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:14:27,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:27,318 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:27,318 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 19, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:27,318 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1064 [2021-05-06 12:14:27,318 INFO L428 AbstractCegarLoop]: === Iteration 231 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:27,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:27,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1478828156, now seen corresponding path program 213 times [2021-05-06 12:14:27,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:27,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858390715] [2021-05-06 12:14:27,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:27,323 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:27,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:27,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:27,363 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:27,377 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:27,380 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:27,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:27,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:27,409 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:27,421 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:27,422 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:27,424 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:27,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,433 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:27,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:27,453 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:27,465 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:27,468 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:27,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:27,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:27,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:27,497 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:27,507 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:27,508 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:27,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:27,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:27,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:27,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:27,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:27,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:27,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:28,695 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:28,695 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858390715] [2021-05-06 12:14:28,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1858390715] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:28,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:28,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:14:28,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659601661] [2021-05-06 12:14:28,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:14:28,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:28,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:14:28,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1070, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:14:28,696 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 33 states, 33 states have (on average 2.484848484848485) internal successors, (82), 32 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:32,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:32,768 INFO L93 Difference]: Finished difference Result 1336 states and 1537 transitions. [2021-05-06 12:14:32,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:14:32,769 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.484848484848485) internal successors, (82), 32 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:32,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:32,769 INFO L225 Difference]: With dead ends: 1336 [2021-05-06 12:14:32,769 INFO L226 Difference]: Without dead ends: 823 [2021-05-06 12:14:32,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 13 SyntacticMatches, 38 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 1187.6ms TimeCoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:14:32,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 823 states. [2021-05-06 12:14:34,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 823 to 640. [2021-05-06 12:14:34,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:34,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:14:34,381 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:14:34,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:34,381 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:14:34,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.484848484848485) internal successors, (82), 32 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:34,381 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:14:34,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:34,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:34,381 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 18, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:34,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1069 [2021-05-06 12:14:34,381 INFO L428 AbstractCegarLoop]: === Iteration 232 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:34,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:34,382 INFO L82 PathProgramCache]: Analyzing trace with hash -207351682, now seen corresponding path program 214 times [2021-05-06 12:14:34,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:34,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230686293] [2021-05-06 12:14:34,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:34,387 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:34,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:34,410 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:34,417 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:34,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:34,431 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:34,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,451 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:34,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:34,461 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:34,471 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:34,472 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:34,474 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:34,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:34,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:34,501 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:34,513 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:34,516 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:34,516 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:34,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:34,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:34,545 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:34,555 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:34,555 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:34,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:34,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:34,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:34,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:34,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:34,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:34,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:35,836 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:35,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230686293] [2021-05-06 12:14:35,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [230686293] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:35,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:35,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:14:35,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968088918] [2021-05-06 12:14:35,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:14:35,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:35,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:14:35,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1132, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:14:35,837 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 34 states, 34 states have (on average 2.411764705882353) internal successors, (82), 33 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:39,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:39,951 INFO L93 Difference]: Finished difference Result 1327 states and 1528 transitions. [2021-05-06 12:14:39,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:14:39,951 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.411764705882353) internal successors, (82), 33 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:39,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:39,952 INFO L225 Difference]: With dead ends: 1327 [2021-05-06 12:14:39,952 INFO L226 Difference]: Without dead ends: 814 [2021-05-06 12:14:39,952 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 38 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 868 ImplicationChecksByTransitivity, 1285.2ms TimeCoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:14:39,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 814 states. [2021-05-06 12:14:41,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 814 to 640. [2021-05-06 12:14:41,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:41,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:14:41,571 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:14:41,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:41,571 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:14:41,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.411764705882353) internal successors, (82), 33 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:41,571 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:14:41,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:41,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:41,571 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:41,571 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1074 [2021-05-06 12:14:41,572 INFO L428 AbstractCegarLoop]: === Iteration 233 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:41,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:41,572 INFO L82 PathProgramCache]: Analyzing trace with hash 471920572, now seen corresponding path program 215 times [2021-05-06 12:14:41,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:41,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282214255] [2021-05-06 12:14:41,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:41,577 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:41,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:41,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:41,602 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:41,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:41,616 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:41,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:41,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:41,644 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:41,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:41,654 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:41,656 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:41,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:41,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:41,682 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:41,693 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:41,695 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:41,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:41,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:41,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:41,722 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:41,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:41,733 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:41,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:41,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:41,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:41,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:41,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:41,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:41,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:43,019 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:43,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282214255] [2021-05-06 12:14:43,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [282214255] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:43,019 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:43,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:14:43,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838265300] [2021-05-06 12:14:43,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:14:43,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:43,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:14:43,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:14:43,020 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 35 states, 35 states have (on average 2.342857142857143) internal successors, (82), 34 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:46,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:46,890 INFO L93 Difference]: Finished difference Result 1318 states and 1515 transitions. [2021-05-06 12:14:46,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:14:46,890 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.342857142857143) internal successors, (82), 34 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:46,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:46,891 INFO L225 Difference]: With dead ends: 1318 [2021-05-06 12:14:46,891 INFO L226 Difference]: Without dead ends: 805 [2021-05-06 12:14:46,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 37 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1020 ImplicationChecksByTransitivity, 1265.7ms TimeCoverageRelationStatistics Valid=164, Invalid=1396, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:14:46,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 805 states. [2021-05-06 12:14:48,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 805 to 640. [2021-05-06 12:14:48,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:48,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:14:48,520 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:14:48,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:48,520 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:14:48,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.342857142857143) internal successors, (82), 34 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:48,520 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:14:48,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:48,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:48,521 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:48,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1079 [2021-05-06 12:14:48,521 INFO L428 AbstractCegarLoop]: === Iteration 234 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:48,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:48,521 INFO L82 PathProgramCache]: Analyzing trace with hash 1032620350, now seen corresponding path program 216 times [2021-05-06 12:14:48,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:48,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551881393] [2021-05-06 12:14:48,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:48,526 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:48,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:48,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:48,555 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:48,566 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:48,568 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:48,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:48,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:48,597 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:48,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:48,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:48,612 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:48,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:48,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:48,642 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:48,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:48,658 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:48,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:48,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:48,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:48,689 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:48,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:48,701 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:48,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:48,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:48,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:48,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:48,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:48,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:48,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:49,983 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:49,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551881393] [2021-05-06 12:14:49,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [551881393] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:49,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:49,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:14:49,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429123110] [2021-05-06 12:14:49,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:14:49,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:49,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:14:49,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1262, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:14:49,984 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 36 states, 36 states have (on average 2.2777777777777777) internal successors, (82), 35 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:54,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:54,474 INFO L93 Difference]: Finished difference Result 1309 states and 1510 transitions. [2021-05-06 12:14:54,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:14:54,474 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.2777777777777777) internal successors, (82), 35 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:54,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:54,475 INFO L225 Difference]: With dead ends: 1309 [2021-05-06 12:14:54,475 INFO L226 Difference]: Without dead ends: 796 [2021-05-06 12:14:54,475 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 13 SyntacticMatches, 35 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1027 ImplicationChecksByTransitivity, 1289.2ms TimeCoverageRelationStatistics Valid=175, Invalid=1465, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:14:54,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 796 states. [2021-05-06 12:14:56,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 796 to 640. [2021-05-06 12:14:56,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:56,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:14:56,080 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:14:56,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:56,080 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:14:56,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.2777777777777777) internal successors, (82), 35 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:56,080 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:14:56,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:56,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:56,080 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:56,081 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1084 [2021-05-06 12:14:56,081 INFO L428 AbstractCegarLoop]: === Iteration 235 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:56,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:56,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1073295100, now seen corresponding path program 217 times [2021-05-06 12:14:56,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:56,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612720284] [2021-05-06 12:14:56,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:56,086 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:56,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:56,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:56,113 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:56,124 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,126 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:56,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:56,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:56,152 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:56,162 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,162 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:56,164 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:56,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,182 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:56,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:56,191 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:56,202 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,204 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:56,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,221 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:56,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:56,231 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:56,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:56,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:56,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:56,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:56,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:56,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:56,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:56,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:57,457 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:57,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612720284] [2021-05-06 12:14:57,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [612720284] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:57,458 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:57,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:14:57,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132385439] [2021-05-06 12:14:57,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:14:57,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:57,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:14:57,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1330, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:14:57,458 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 37 states, 37 states have (on average 2.2162162162162162) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:01,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:01,335 INFO L93 Difference]: Finished difference Result 1300 states and 1501 transitions. [2021-05-06 12:15:01,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:15:01,335 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.2162162162162162) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:01,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:01,336 INFO L225 Difference]: With dead ends: 1300 [2021-05-06 12:15:01,336 INFO L226 Difference]: Without dead ends: 787 [2021-05-06 12:15:01,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 13 SyntacticMatches, 34 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 1223.7ms TimeCoverageRelationStatistics Valid=185, Invalid=1537, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:15:01,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 787 states. [2021-05-06 12:15:02,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 787 to 640. [2021-05-06 12:15:02,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:02,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:02,996 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:02,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:02,996 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:02,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.2162162162162162) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:02,996 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:02,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:02,996 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:02,997 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:02,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1089 [2021-05-06 12:15:02,997 INFO L428 AbstractCegarLoop]: === Iteration 236 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:02,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:02,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1517195774, now seen corresponding path program 218 times [2021-05-06 12:15:02,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:02,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780223160] [2021-05-06 12:15:02,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:03,002 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:03,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:03,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:03,031 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:03,042 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:03,044 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:03,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,054 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:03,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:03,074 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:03,083 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:03,084 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:03,086 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:03,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:03,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:03,114 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:03,126 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:03,128 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:03,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,138 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:03,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:03,157 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:03,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:03,168 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:03,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:03,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:03,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:03,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:03,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:03,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:03,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:04,515 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:04,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780223160] [2021-05-06 12:15:04,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [780223160] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:04,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:04,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:15:04,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965471282] [2021-05-06 12:15:04,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:15:04,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:04,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:15:04,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1400, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:15:04,516 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 37 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:08,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:08,487 INFO L93 Difference]: Finished difference Result 1291 states and 1492 transitions. [2021-05-06 12:15:08,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:15:08,488 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 37 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:08,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:08,488 INFO L225 Difference]: With dead ends: 1291 [2021-05-06 12:15:08,489 INFO L226 Difference]: Without dead ends: 778 [2021-05-06 12:15:08,489 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 34 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 1348.4ms TimeCoverageRelationStatistics Valid=195, Invalid=1611, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:15:08,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2021-05-06 12:15:10,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 640. [2021-05-06 12:15:10,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:10,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:10,377 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:10,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:10,377 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:10,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 37 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:10,377 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:10,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:10,377 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:10,377 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:10,377 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1094 [2021-05-06 12:15:10,377 INFO L428 AbstractCegarLoop]: === Iteration 237 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:10,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:10,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1036115516, now seen corresponding path program 219 times [2021-05-06 12:15:10,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:10,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029659028] [2021-05-06 12:15:10,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:10,383 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:10,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:10,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:10,412 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:10,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:10,426 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:10,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:10,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:10,454 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:10,464 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:10,465 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:10,467 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:10,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,468 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:10,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:10,494 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:10,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:10,508 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:10,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:10,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:10,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:10,535 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:10,545 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:10,545 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:10,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:10,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:10,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:10,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:10,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:10,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:10,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:11,862 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:11,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029659028] [2021-05-06 12:15:11,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2029659028] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:11,863 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:11,863 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:15:11,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858179100] [2021-05-06 12:15:11,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:15:11,863 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:11,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:15:11,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1472, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:15:11,864 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:15,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:15,355 INFO L93 Difference]: Finished difference Result 1282 states and 1483 transitions. [2021-05-06 12:15:15,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:15:15,355 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:15,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:15,356 INFO L225 Difference]: With dead ends: 1282 [2021-05-06 12:15:15,356 INFO L226 Difference]: Without dead ends: 769 [2021-05-06 12:15:15,359 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 33 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1243 ImplicationChecksByTransitivity, 1307.4ms TimeCoverageRelationStatistics Valid=205, Invalid=1687, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:15:15,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2021-05-06 12:15:16,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 640. [2021-05-06 12:15:16,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:16,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:16,996 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:16,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:16,996 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:16,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:16,997 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:16,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:16,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:16,997 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:16,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1099 [2021-05-06 12:15:16,997 INFO L428 AbstractCegarLoop]: === Iteration 238 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:16,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:16,997 INFO L82 PathProgramCache]: Analyzing trace with hash 683027134, now seen corresponding path program 220 times [2021-05-06 12:15:16,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:16,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792967076] [2021-05-06 12:15:16,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:17,003 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:17,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,012 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:17,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:17,030 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:17,042 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:17,044 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:17,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:17,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:17,072 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:17,082 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:17,082 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:17,085 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:17,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:17,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:17,114 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:17,125 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:17,128 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:17,128 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:17,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:17,155 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:17,165 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:17,165 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:17,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:17,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:17,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:17,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:17,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:17,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:17,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:18,527 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:18,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792967076] [2021-05-06 12:15:18,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [792967076] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:18,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:18,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:15:18,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948438843] [2021-05-06 12:15:18,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:15:18,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:18,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:15:18,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1546, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:15:18,528 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 40 states, 40 states have (on average 2.05) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:22,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:22,257 INFO L93 Difference]: Finished difference Result 1273 states and 1474 transitions. [2021-05-06 12:15:22,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:15:22,257 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.05) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:22,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:22,258 INFO L225 Difference]: With dead ends: 1273 [2021-05-06 12:15:22,258 INFO L226 Difference]: Without dead ends: 760 [2021-05-06 12:15:22,259 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 13 SyntacticMatches, 31 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 1363.4ms TimeCoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:15:22,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2021-05-06 12:15:23,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 640. [2021-05-06 12:15:23,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:23,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:23,990 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:23,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:23,990 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:23,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.05) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:23,990 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:23,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:23,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:23,990 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:23,990 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1104 [2021-05-06 12:15:23,990 INFO L428 AbstractCegarLoop]: === Iteration 239 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:23,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:23,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1366360708, now seen corresponding path program 221 times [2021-05-06 12:15:23,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:23,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442125204] [2021-05-06 12:15:23,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:23,997 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:24,009 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:24,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:24,030 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:24,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:24,046 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:24,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:24,069 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:24,076 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:24,086 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:24,087 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:24,090 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:24,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:24,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:24,119 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:24,131 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:24,133 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:24,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:24,152 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:24,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:24,163 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:24,172 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:24,173 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:24,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:24,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:24,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:24,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:24,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:24,215 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:24,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:25,525 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:25,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442125204] [2021-05-06 12:15:25,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [442125204] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:25,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:25,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:15:25,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188398808] [2021-05-06 12:15:25,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:15:25,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:25,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:15:25,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1622, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:15:25,526 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:29,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:29,076 INFO L93 Difference]: Finished difference Result 1293 states and 1497 transitions. [2021-05-06 12:15:29,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:15:29,077 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:29,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:29,077 INFO L225 Difference]: With dead ends: 1293 [2021-05-06 12:15:29,077 INFO L226 Difference]: Without dead ends: 780 [2021-05-06 12:15:29,078 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 31 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 1347.3ms TimeCoverageRelationStatistics Valid=225, Invalid=1845, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:15:29,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 780 states. [2021-05-06 12:15:30,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 780 to 640. [2021-05-06 12:15:30,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:30,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:30,772 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:30,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:30,772 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:30,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:30,772 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:30,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:30,772 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:30,772 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:30,772 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1109 [2021-05-06 12:15:30,772 INFO L428 AbstractCegarLoop]: === Iteration 240 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:30,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:30,773 INFO L82 PathProgramCache]: Analyzing trace with hash -942713986, now seen corresponding path program 222 times [2021-05-06 12:15:30,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:30,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458244001] [2021-05-06 12:15:30,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:30,778 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:30,779 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:30,788 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:30,806 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:30,817 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,820 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:30,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:30,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:30,849 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:30,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,860 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:30,862 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:30,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:30,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:30,890 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:30,902 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,904 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:30,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:30,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:30,934 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:30,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,944 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:30,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:30,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:30,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:30,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:32,345 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:32,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458244001] [2021-05-06 12:15:32,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [458244001] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:32,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:32,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:15:32,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620238912] [2021-05-06 12:15:32,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:15:32,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:32,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:15:32,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1700, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:15:32,347 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:35,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:35,594 INFO L93 Difference]: Finished difference Result 1255 states and 1456 transitions. [2021-05-06 12:15:35,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:15:35,594 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:35,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:35,595 INFO L225 Difference]: With dead ends: 1255 [2021-05-06 12:15:35,595 INFO L226 Difference]: Without dead ends: 742 [2021-05-06 12:15:35,595 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 30 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1404.5ms TimeCoverageRelationStatistics Valid=235, Invalid=1927, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:15:35,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 742 states. [2021-05-06 12:15:37,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 742 to 640. [2021-05-06 12:15:37,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:37,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:37,089 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:37,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:37,089 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:37,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:37,089 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:37,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:37,090 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:37,090 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:37,090 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1114 [2021-05-06 12:15:37,090 INFO L428 AbstractCegarLoop]: === Iteration 241 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:37,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:37,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1972073284, now seen corresponding path program 223 times [2021-05-06 12:15:37,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:37,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315906513] [2021-05-06 12:15:37,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:37,096 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:37,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:37,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:37,121 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:37,132 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:37,134 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:37,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:37,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:37,160 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:37,170 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:37,170 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:37,173 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:37,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:37,182 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:37,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:37,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:37,212 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:37,221 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,222 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:37,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:37,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:37,240 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:37,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:37,250 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:37,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:37,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:37,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:37,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:37,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:37,292 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:37,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:38,664 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:38,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315906513] [2021-05-06 12:15:38,664 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [315906513] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:38,664 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:38,664 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:15:38,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259510122] [2021-05-06 12:15:38,665 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:15:38,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:38,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:15:38,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1780, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:15:38,665 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:41,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:41,961 INFO L93 Difference]: Finished difference Result 1246 states and 1447 transitions. [2021-05-06 12:15:41,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:15:41,961 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:41,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:41,962 INFO L225 Difference]: With dead ends: 1246 [2021-05-06 12:15:41,962 INFO L226 Difference]: Without dead ends: 733 [2021-05-06 12:15:41,962 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 29 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1381 ImplicationChecksByTransitivity, 1418.5ms TimeCoverageRelationStatistics Valid=245, Invalid=2011, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:15:41,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 733 states. [2021-05-06 12:15:43,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 733 to 640. [2021-05-06 12:15:43,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:43,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:43,631 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:43,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:43,632 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:43,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:43,632 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:43,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:43,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:43,632 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:43,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1119 [2021-05-06 12:15:43,632 INFO L428 AbstractCegarLoop]: === Iteration 242 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:43,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:43,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1478888510, now seen corresponding path program 224 times [2021-05-06 12:15:43,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:43,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920633327] [2021-05-06 12:15:43,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:43,638 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:43,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:43,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:43,665 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:43,676 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:43,679 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:43,679 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,690 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:43,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:43,708 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:43,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:43,718 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:43,720 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:43,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:43,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:43,748 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:43,760 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:43,763 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:43,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:43,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:43,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:43,792 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:43,802 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:43,803 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:43,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:43,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:43,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:43,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:43,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:43,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:43,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:45,200 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:45,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920633327] [2021-05-06 12:15:45,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1920633327] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:45,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:45,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:15:45,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505879077] [2021-05-06 12:15:45,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:15:45,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:45,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:15:45,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1945, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:15:45,201 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:48,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:48,896 INFO L93 Difference]: Finished difference Result 1264 states and 1461 transitions. [2021-05-06 12:15:48,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:15:48,897 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:48,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:48,898 INFO L225 Difference]: With dead ends: 1264 [2021-05-06 12:15:48,898 INFO L226 Difference]: Without dead ends: 751 [2021-05-06 12:15:48,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 28 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1434 ImplicationChecksByTransitivity, 1372.5ms TimeCoverageRelationStatistics Valid=254, Invalid=2098, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:15:48,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-05-06 12:15:50,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 640. [2021-05-06 12:15:50,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:50,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:50,642 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:50,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:50,642 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:50,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:50,642 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:50,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:50,642 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:50,642 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:50,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1124 [2021-05-06 12:15:50,643 INFO L428 AbstractCegarLoop]: === Iteration 243 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:50,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:50,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1753648124, now seen corresponding path program 225 times [2021-05-06 12:15:50,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:50,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893665091] [2021-05-06 12:15:50,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:50,648 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:50,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:50,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:50,676 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:50,688 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:50,690 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:50,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:50,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:50,719 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:50,729 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:50,729 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:50,732 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:50,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:50,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:50,759 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:50,771 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:50,773 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:50,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:50,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:50,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:50,804 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:50,814 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:50,814 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:50,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:50,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:50,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:50,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:50,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:50,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:50,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:52,292 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:52,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893665091] [2021-05-06 12:15:52,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1893665091] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:52,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:52,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:15:52,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206798642] [2021-05-06 12:15:52,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:15:52,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:52,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:15:52,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2032, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:15:52,293 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:56,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:56,905 INFO L93 Difference]: Finished difference Result 1258 states and 1455 transitions. [2021-05-06 12:15:56,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:15:56,905 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:56,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:56,906 INFO L225 Difference]: With dead ends: 1258 [2021-05-06 12:15:56,906 INFO L226 Difference]: Without dead ends: 745 [2021-05-06 12:15:56,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 13 SyntacticMatches, 27 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1386 ImplicationChecksByTransitivity, 1432.6ms TimeCoverageRelationStatistics Valid=228, Invalid=2124, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:15:56,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2021-05-06 12:15:58,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 640. [2021-05-06 12:15:58,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:58,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:15:58,644 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:15:58,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:58,644 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:15:58,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:58,644 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:15:58,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:58,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:58,644 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:58,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1129 [2021-05-06 12:15:58,644 INFO L428 AbstractCegarLoop]: === Iteration 244 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:58,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:58,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1155115778, now seen corresponding path program 226 times [2021-05-06 12:15:58,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:58,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638937569] [2021-05-06 12:15:58,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:58,650 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:58,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,658 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:58,660 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:58,675 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:58,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:58,688 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:58,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:58,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:58,719 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:58,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:58,732 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:58,735 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:58,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:58,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:58,768 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:58,782 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:58,784 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:58,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,795 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:58,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:58,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:58,816 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:58,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:58,829 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:58,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:58,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:58,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:58,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:58,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:58,873 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:58,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:00,101 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:00,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638937569] [2021-05-06 12:16:00,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [638937569] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:00,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:00,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:16:00,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986784420] [2021-05-06 12:16:00,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:16:00,102 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:00,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:16:00,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2032, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:16:00,103 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:03,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:03,005 INFO L93 Difference]: Finished difference Result 1219 states and 1420 transitions. [2021-05-06 12:16:03,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 12:16:03,005 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:03,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:03,006 INFO L225 Difference]: With dead ends: 1219 [2021-05-06 12:16:03,006 INFO L226 Difference]: Without dead ends: 706 [2021-05-06 12:16:03,006 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 26 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1390 ImplicationChecksByTransitivity, 1267.8ms TimeCoverageRelationStatistics Valid=275, Invalid=2275, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:16:03,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2021-05-06 12:16:04,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 640. [2021-05-06 12:16:04,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:04,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:16:04,749 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:16:04,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:04,749 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:16:04,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:04,750 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:16:04,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:04,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:04,750 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:04,750 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1134 [2021-05-06 12:16:04,750 INFO L428 AbstractCegarLoop]: === Iteration 245 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:04,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:04,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1093076164, now seen corresponding path program 227 times [2021-05-06 12:16:04,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:04,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101114865] [2021-05-06 12:16:04,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:04,756 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:04,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,764 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:04,766 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:04,783 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:04,794 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,797 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:04,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:04,819 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:04,826 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:04,836 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,836 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:04,839 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:04,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,848 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:04,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:04,867 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:04,879 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,882 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:04,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:04,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:04,911 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:04,921 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,921 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:04,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:04,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:04,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:04,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:04,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:04,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:06,389 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:06,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101114865] [2021-05-06 12:16:06,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [101114865] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:06,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:06,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:16:06,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637296843] [2021-05-06 12:16:06,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:16:06,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:06,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:16:06,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=2120, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:16:06,390 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:09,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:09,331 INFO L93 Difference]: Finished difference Result 1221 states and 1425 transitions. [2021-05-06 12:16:09,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 12:16:09,331 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:09,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:09,332 INFO L225 Difference]: With dead ends: 1221 [2021-05-06 12:16:09,332 INFO L226 Difference]: Without dead ends: 708 [2021-05-06 12:16:09,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 25 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1375 ImplicationChecksByTransitivity, 1466.5ms TimeCoverageRelationStatistics Valid=285, Invalid=2367, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:16:09,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2021-05-06 12:16:11,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 640. [2021-05-06 12:16:11,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:11,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:16:11,043 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:16:11,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:11,044 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:16:11,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:11,044 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:16:11,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:11,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:11,044 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 18, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:11,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1139 [2021-05-06 12:16:11,044 INFO L428 AbstractCegarLoop]: === Iteration 246 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:11,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:11,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1396452798, now seen corresponding path program 228 times [2021-05-06 12:16:11,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:11,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352070914] [2021-05-06 12:16:11,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:11,050 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:11,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:11,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:11,076 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:11,087 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:11,090 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:11,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,091 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,100 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:11,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:11,116 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:11,125 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:11,126 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:11,128 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:11,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,130 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:11,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:11,154 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:11,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:11,168 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:11,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:11,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:11,189 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:11,196 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:11,206 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:11,207 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:11,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:11,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:11,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:11,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:11,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:11,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:11,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:12,684 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:12,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352070914] [2021-05-06 12:16:12,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [352070914] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:12,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:12,684 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:16:12,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055133907] [2021-05-06 12:16:12,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:16:12,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:12,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:16:12,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=2210, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:16:12,685 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:15,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:15,583 INFO L93 Difference]: Finished difference Result 1201 states and 1402 transitions. [2021-05-06 12:16:15,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 12:16:15,584 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:15,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:15,584 INFO L225 Difference]: With dead ends: 1201 [2021-05-06 12:16:15,584 INFO L226 Difference]: Without dead ends: 688 [2021-05-06 12:16:15,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 24 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 1473.4ms TimeCoverageRelationStatistics Valid=295, Invalid=2461, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:16:15,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2021-05-06 12:16:17,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 640. [2021-05-06 12:16:17,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:17,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:16:17,342 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:16:17,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:17,342 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:16:17,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:17,342 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:16:17,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:17,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:17,342 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 19, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:17,342 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1144 [2021-05-06 12:16:17,342 INFO L428 AbstractCegarLoop]: === Iteration 247 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:17,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:17,343 INFO L82 PathProgramCache]: Analyzing trace with hash 578804348, now seen corresponding path program 229 times [2021-05-06 12:16:17,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:17,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857973848] [2021-05-06 12:16:17,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:17,350 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:17,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,352 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,358 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:17,360 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:17,374 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:17,386 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:17,388 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:17,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:17,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:17,420 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:17,432 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:17,432 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:17,435 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:17,435 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:17,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:17,464 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:17,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:17,480 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:17,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:17,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:17,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:17,510 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:17,521 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:17,522 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:17,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:17,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:17,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:17,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:17,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:17,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:17,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:19,069 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:19,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857973848] [2021-05-06 12:16:19,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [857973848] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:19,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:19,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 12:16:19,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390038808] [2021-05-06 12:16:19,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 12:16:19,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:19,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 12:16:19,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=2302, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:16:19,070 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 48 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:22,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:22,886 INFO L93 Difference]: Finished difference Result 1192 states and 1393 transitions. [2021-05-06 12:16:22,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 12:16:22,887 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 48 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:22,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:22,887 INFO L225 Difference]: With dead ends: 1192 [2021-05-06 12:16:22,887 INFO L226 Difference]: Without dead ends: 679 [2021-05-06 12:16:22,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 23 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1318 ImplicationChecksByTransitivity, 1545.1ms TimeCoverageRelationStatistics Valid=305, Invalid=2557, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:16:22,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-06 12:16:24,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 640. [2021-05-06 12:16:24,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:24,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:16:24,632 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:16:24,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:24,632 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:16:24,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 48 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:24,632 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:16:24,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:24,633 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:24,633 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:24,633 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1149 [2021-05-06 12:16:24,633 INFO L428 AbstractCegarLoop]: === Iteration 248 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:24,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:24,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1009543554, now seen corresponding path program 230 times [2021-05-06 12:16:24,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:24,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255949908] [2021-05-06 12:16:24,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:24,638 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:24,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,656 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:24,658 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:24,665 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:24,677 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:24,679 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:24,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:24,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:24,706 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:24,716 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:24,716 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:24,719 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:24,719 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,720 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:24,728 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:24,744 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:24,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:24,758 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:24,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:24,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:24,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:24,785 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:24,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:24,795 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:24,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:24,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:24,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:24,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:24,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:24,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:24,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:26,210 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:26,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255949908] [2021-05-06 12:16:26,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1255949908] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:26,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:26,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 12:16:26,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490291798] [2021-05-06 12:16:26,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 12:16:26,211 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:26,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 12:16:26,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2396, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:16:26,211 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 50 states, 50 states have (on average 1.64) internal successors, (82), 49 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:29,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:29,162 INFO L93 Difference]: Finished difference Result 1187 states and 1388 transitions. [2021-05-06 12:16:29,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 12:16:29,162 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.64) internal successors, (82), 49 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:29,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:29,163 INFO L225 Difference]: With dead ends: 1187 [2021-05-06 12:16:29,163 INFO L226 Difference]: Without dead ends: 674 [2021-05-06 12:16:29,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 22 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1276 ImplicationChecksByTransitivity, 1416.8ms TimeCoverageRelationStatistics Valid=315, Invalid=2655, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:16:29,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-05-06 12:16:30,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 640. [2021-05-06 12:16:30,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 625 states have (on average 1.1728) internal successors, (733), 628 states have internal predecessors, (733), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:30,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 750 transitions. [2021-05-06 12:16:30,742 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 750 transitions. Word has length 88 [2021-05-06 12:16:30,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:30,743 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 750 transitions. [2021-05-06 12:16:30,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.64) internal successors, (82), 49 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:30,743 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 750 transitions. [2021-05-06 12:16:30,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:30,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:30,743 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:30,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1154 [2021-05-06 12:16:30,743 INFO L428 AbstractCegarLoop]: === Iteration 249 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:30,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:30,743 INFO L82 PathProgramCache]: Analyzing trace with hash -2020660804, now seen corresponding path program 231 times [2021-05-06 12:16:30,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:30,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467919240] [2021-05-06 12:16:30,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:30,748 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:30,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:30,770 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:30,777 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:30,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:30,788 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:16:30,790 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:30,791 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:30,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:30,816 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:30,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:30,830 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:30,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,841 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:30,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:30,858 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:30,868 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:30,869 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:30,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:30,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:30,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:30,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:30,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:30,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:30,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:32,509 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:32,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467919240] [2021-05-06 12:16:32,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [467919240] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:32,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:32,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 12:16:32,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659772086] [2021-05-06 12:16:32,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 12:16:32,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:32,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 12:16:32,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=2492, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:16:32,510 INFO L87 Difference]: Start difference. First operand 640 states and 750 transitions. Second operand has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 50 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:35,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:35,587 INFO L93 Difference]: Finished difference Result 1201 states and 1412 transitions. [2021-05-06 12:16:35,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 12:16:35,588 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 50 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:35,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:35,593 INFO L225 Difference]: With dead ends: 1201 [2021-05-06 12:16:35,593 INFO L226 Difference]: Without dead ends: 677 [2021-05-06 12:16:35,594 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 12 SyntacticMatches, 21 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1630.1ms TimeCoverageRelationStatistics Valid=325, Invalid=2755, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 12:16:35,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-06 12:16:37,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 652. [2021-05-06 12:16:37,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 652 states, 637 states have (on average 1.1758241758241759) internal successors, (749), 640 states have internal predecessors, (749), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:37,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 652 states to 652 states and 766 transitions. [2021-05-06 12:16:37,249 INFO L78 Accepts]: Start accepts. Automaton has 652 states and 766 transitions. Word has length 88 [2021-05-06 12:16:37,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:37,249 INFO L480 AbstractCegarLoop]: Abstraction has 652 states and 766 transitions. [2021-05-06 12:16:37,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 50 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:37,249 INFO L276 IsEmpty]: Start isEmpty. Operand 652 states and 766 transitions. [2021-05-06 12:16:37,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:16:37,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:37,250 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:37,250 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1158 [2021-05-06 12:16:37,250 INFO L428 AbstractCegarLoop]: === Iteration 250 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:37,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:37,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1141624257, now seen corresponding path program 232 times [2021-05-06 12:16:37,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:37,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505659735] [2021-05-06 12:16:37,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:37,256 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:37,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:37,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:37,281 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:37,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:37,308 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:37,332 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,333 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,342 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:37,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:37,351 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:37,377 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:37,378 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:37,380 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:37,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:37,401 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:37,408 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:37,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:37,436 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:37,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:37,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:37,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:37,471 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:37,481 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:37,482 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:37,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:37,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:37,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:37,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:37,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:37,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:37,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:38,750 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:38,750 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505659735] [2021-05-06 12:16:38,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1505659735] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:38,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:38,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:16:38,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678759107] [2021-05-06 12:16:38,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:16:38,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:38,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:16:38,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1015, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:16:38,751 INFO L87 Difference]: Start difference. First operand 652 states and 766 transitions. Second operand has 32 states, 32 states have (on average 2.65625) internal successors, (85), 31 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:43,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:43,019 INFO L93 Difference]: Finished difference Result 1375 states and 1583 transitions. [2021-05-06 12:16:43,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:16:43,019 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.65625) internal successors, (85), 31 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:16:43,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:43,020 INFO L225 Difference]: With dead ends: 1375 [2021-05-06 12:16:43,020 INFO L226 Difference]: Without dead ends: 853 [2021-05-06 12:16:43,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 12 SyntacticMatches, 43 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 1257.9ms TimeCoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:16:43,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 853 states. [2021-05-06 12:16:44,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 853 to 661. [2021-05-06 12:16:44,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:44,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:16:44,734 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:16:44,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:44,734 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:16:44,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.65625) internal successors, (85), 31 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:44,734 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:16:44,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:16:44,734 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:44,735 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:44,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1163 [2021-05-06 12:16:44,735 INFO L428 AbstractCegarLoop]: === Iteration 251 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:44,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:44,735 INFO L82 PathProgramCache]: Analyzing trace with hash -254401411, now seen corresponding path program 233 times [2021-05-06 12:16:44,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:44,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114817991] [2021-05-06 12:16:44,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:44,741 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:44,741 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:44,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:44,766 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:44,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:44,780 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:44,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,782 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:44,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:44,808 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:44,818 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:44,818 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:44,821 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:44,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,840 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:44,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:44,849 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:44,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:44,863 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:44,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:44,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:44,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:44,891 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:44,901 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:44,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:44,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:44,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:44,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:44,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:44,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:44,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:44,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:46,236 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:46,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114817991] [2021-05-06 12:16:46,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1114817991] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:46,236 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:46,236 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:16:46,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181380424] [2021-05-06 12:16:46,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:16:46,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:46,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:16:46,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1075, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:16:46,237 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:50,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:50,727 INFO L93 Difference]: Finished difference Result 1393 states and 1601 transitions. [2021-05-06 12:16:50,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:16:50,727 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:16:50,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:50,728 INFO L225 Difference]: With dead ends: 1393 [2021-05-06 12:16:50,728 INFO L226 Difference]: Without dead ends: 862 [2021-05-06 12:16:50,729 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 14 SyntacticMatches, 40 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 1315.9ms TimeCoverageRelationStatistics Valid=138, Invalid=1268, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:16:50,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 862 states. [2021-05-06 12:16:52,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 862 to 661. [2021-05-06 12:16:52,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:52,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:16:52,458 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:16:52,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:52,458 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:16:52,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:52,458 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:16:52,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:16:52,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:52,458 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 20, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:52,458 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1168 [2021-05-06 12:16:52,458 INFO L428 AbstractCegarLoop]: === Iteration 252 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:52,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:52,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1221752065, now seen corresponding path program 234 times [2021-05-06 12:16:52,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:52,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825228191] [2021-05-06 12:16:52,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:52,464 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:52,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:52,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:52,492 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:52,504 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:52,506 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:52,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:52,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:52,533 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:52,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:52,543 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:52,546 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:52,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:52,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:52,571 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:52,583 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:52,585 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:52,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,596 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:52,599 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:52,614 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:52,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:52,624 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:52,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:52,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:52,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:52,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:52,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:52,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:52,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:53,782 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:53,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825228191] [2021-05-06 12:16:53,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1825228191] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:53,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:53,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:16:53,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888871454] [2021-05-06 12:16:53,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:16:53,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:53,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:16:53,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1137, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:16:53,783 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 34 states, 34 states have (on average 2.5) internal successors, (85), 33 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:58,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:58,573 INFO L93 Difference]: Finished difference Result 1384 states and 1592 transitions. [2021-05-06 12:16:58,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:16:58,573 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.5) internal successors, (85), 33 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:16:58,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:58,574 INFO L225 Difference]: With dead ends: 1384 [2021-05-06 12:16:58,574 INFO L226 Difference]: Without dead ends: 853 [2021-05-06 12:16:58,575 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 12 SyntacticMatches, 41 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 1140.2ms TimeCoverageRelationStatistics Valid=148, Invalid=1334, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:16:58,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 853 states. [2021-05-06 12:17:00,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 853 to 661. [2021-05-06 12:17:00,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:17:00,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:17:00,635 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:17:00,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:00,635 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:17:00,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.5) internal successors, (85), 33 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:00,635 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:17:00,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:17:00,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:00,635 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 19, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:00,635 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1173 [2021-05-06 12:17:00,635 INFO L428 AbstractCegarLoop]: === Iteration 253 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:00,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:00,636 INFO L82 PathProgramCache]: Analyzing trace with hash -267811907, now seen corresponding path program 235 times [2021-05-06 12:17:00,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:00,636 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [908523775] [2021-05-06 12:17:00,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:00,641 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:17:00,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:00,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:00,669 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:17:00,681 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:00,683 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:17:00,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:00,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:00,714 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:17:00,723 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:00,724 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:00,726 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:17:00,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:00,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:00,755 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:17:00,766 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:00,768 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:17:00,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:00,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:00,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:00,795 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:17:00,805 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:00,806 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:00,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:00,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:00,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:00,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:17:00,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:00,849 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:17:00,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:17:02,164 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:02,165 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [908523775] [2021-05-06 12:17:02,165 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [908523775] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:02,165 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:02,165 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:17:02,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542764022] [2021-05-06 12:17:02,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:17:02,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:02,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:17:02,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1201, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:17:02,165 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 34 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:07,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:07,207 INFO L93 Difference]: Finished difference Result 1375 states and 1583 transitions. [2021-05-06 12:17:07,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:17:07,207 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 34 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:17:07,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:07,208 INFO L225 Difference]: With dead ends: 1375 [2021-05-06 12:17:07,208 INFO L226 Difference]: Without dead ends: 844 [2021-05-06 12:17:07,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 12 SyntacticMatches, 40 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 1355.7ms TimeCoverageRelationStatistics Valid=158, Invalid=1402, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:17:07,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 844 states. [2021-05-06 12:17:09,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 844 to 661. [2021-05-06 12:17:09,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:17:09,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:17:09,484 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:17:09,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:09,484 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:17:09,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 34 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:09,485 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:17:09,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:17:09,485 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:09,485 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:09,485 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1178 [2021-05-06 12:17:09,486 INFO L428 AbstractCegarLoop]: === Iteration 254 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:09,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:09,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1953991745, now seen corresponding path program 236 times [2021-05-06 12:17:09,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:09,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130386594] [2021-05-06 12:17:09,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:09,491 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:17:09,503 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:09,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:09,521 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:17:09,532 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:09,535 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:17:09,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:09,549 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:09,564 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:17:09,573 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:09,574 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:09,576 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:17:09,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:09,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:09,603 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:17:09,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:09,618 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:17:09,626 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:09,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:09,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:09,647 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:17:09,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:09,657 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:09,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:09,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:09,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:09,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:17:09,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:09,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:17:09,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:17:11,081 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:11,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130386594] [2021-05-06 12:17:11,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2130386594] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:11,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:11,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:17:11,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920735030] [2021-05-06 12:17:11,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:17:11,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:11,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:17:11,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1267, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:17:11,082 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 36 states, 36 states have (on average 2.361111111111111) internal successors, (85), 35 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:16,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:16,113 INFO L93 Difference]: Finished difference Result 1366 states and 1574 transitions. [2021-05-06 12:17:16,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:17:16,113 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.361111111111111) internal successors, (85), 35 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:17:16,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:16,114 INFO L225 Difference]: With dead ends: 1366 [2021-05-06 12:17:16,114 INFO L226 Difference]: Without dead ends: 835 [2021-05-06 12:17:16,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 12 SyntacticMatches, 39 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1009 ImplicationChecksByTransitivity, 1427.6ms TimeCoverageRelationStatistics Valid=168, Invalid=1472, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:17:16,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 835 states. [2021-05-06 12:17:18,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 835 to 661. [2021-05-06 12:17:18,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:17:18,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:17:18,414 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:17:18,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:18,414 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:17:18,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.361111111111111) internal successors, (85), 35 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:18,414 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:17:18,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:17:18,414 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:18,415 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 17, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:18,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1183 [2021-05-06 12:17:18,415 INFO L428 AbstractCegarLoop]: === Iteration 255 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:18,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:18,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1274719491, now seen corresponding path program 237 times [2021-05-06 12:17:18,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:18,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [865384145] [2021-05-06 12:17:18,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:18,420 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:17:18,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:18,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:18,448 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:17:18,460 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:18,462 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:17:18,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:18,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:18,492 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:17:18,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:18,502 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:18,504 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:17:18,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:18,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:18,531 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:17:18,542 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:18,545 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:17:18,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:18,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:18,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:18,574 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:17:18,584 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:18,585 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:18,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:18,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:18,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:18,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:17:18,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:18,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:17:18,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:17:19,969 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:19,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [865384145] [2021-05-06 12:17:19,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [865384145] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:19,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:19,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:17:19,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900647646] [2021-05-06 12:17:19,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:17:19,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:19,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:17:19,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1335, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:17:19,970 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 37 states, 37 states have (on average 2.2972972972972974) internal successors, (85), 36 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:25,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:25,051 INFO L93 Difference]: Finished difference Result 1357 states and 1565 transitions. [2021-05-06 12:17:25,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:17:25,051 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.2972972972972974) internal successors, (85), 36 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:17:25,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:25,052 INFO L225 Difference]: With dead ends: 1357 [2021-05-06 12:17:25,052 INFO L226 Difference]: Without dead ends: 826 [2021-05-06 12:17:25,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 14 SyntacticMatches, 36 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1063 ImplicationChecksByTransitivity, 1384.6ms TimeCoverageRelationStatistics Valid=178, Invalid=1544, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:17:25,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 826 states. [2021-05-06 12:17:27,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 826 to 661. [2021-05-06 12:17:27,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:17:27,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:17:27,333 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:17:27,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:27,333 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:17:27,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.2972972972972974) internal successors, (85), 36 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:27,333 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:17:27,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:17:27,333 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:27,333 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:27,333 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1188 [2021-05-06 12:17:27,333 INFO L428 AbstractCegarLoop]: === Iteration 256 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:27,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:27,334 INFO L82 PathProgramCache]: Analyzing trace with hash -714019713, now seen corresponding path program 238 times [2021-05-06 12:17:27,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:27,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018164484] [2021-05-06 12:17:27,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:27,339 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:17:27,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:27,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:27,365 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:17:27,377 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:27,380 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:17:27,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:27,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:27,409 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:17:27,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:27,419 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:27,422 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:17:27,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:27,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:27,451 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:17:27,463 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:27,466 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:17:27,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:27,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:27,480 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:27,494 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:17:27,504 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:27,505 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:27,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:27,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:27,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:27,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:17:27,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:27,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:17:27,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:17:28,945 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:28,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018164484] [2021-05-06 12:17:28,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2018164484] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:28,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:28,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:17:28,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641606402] [2021-05-06 12:17:28,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:17:28,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:28,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:17:28,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1476, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:17:28,946 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:33,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:33,794 INFO L93 Difference]: Finished difference Result 1354 states and 1558 transitions. [2021-05-06 12:17:33,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:17:33,795 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:17:33,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:33,796 INFO L225 Difference]: With dead ends: 1354 [2021-05-06 12:17:33,796 INFO L226 Difference]: Without dead ends: 823 [2021-05-06 12:17:33,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 12 SyntacticMatches, 37 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1238 ImplicationChecksByTransitivity, 1409.4ms TimeCoverageRelationStatistics Valid=187, Invalid=1619, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:17:33,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 823 states. [2021-05-06 12:17:36,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 823 to 661. [2021-05-06 12:17:36,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:17:36,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:17:36,086 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:17:36,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:36,086 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:17:36,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:36,086 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:17:36,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:17:36,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:36,086 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 15, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:36,086 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1193 [2021-05-06 12:17:36,086 INFO L428 AbstractCegarLoop]: === Iteration 257 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:36,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:36,087 INFO L82 PathProgramCache]: Analyzing trace with hash -673344963, now seen corresponding path program 239 times [2021-05-06 12:17:36,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:36,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232336676] [2021-05-06 12:17:36,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:36,093 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:17:36,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:36,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:36,121 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:17:36,133 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:36,135 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:17:36,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:36,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:36,165 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:17:36,176 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:36,177 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:36,179 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:17:36,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:36,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:36,208 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:17:36,220 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:36,223 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:17:36,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:36,242 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:36,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:36,252 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:17:36,279 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:36,280 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:36,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:36,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:36,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:36,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:17:36,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:36,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:17:36,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:17:37,563 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:37,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232336676] [2021-05-06 12:17:37,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [232336676] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:37,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:37,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:17:37,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598526062] [2021-05-06 12:17:37,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:17:37,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:37,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:17:37,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1477, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:17:37,564 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 39 states, 39 states have (on average 2.1794871794871793) internal successors, (85), 38 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:42,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:42,306 INFO L93 Difference]: Finished difference Result 1339 states and 1547 transitions. [2021-05-06 12:17:42,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:17:42,306 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1794871794871793) internal successors, (85), 38 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:17:42,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:42,307 INFO L225 Difference]: With dead ends: 1339 [2021-05-06 12:17:42,307 INFO L226 Difference]: Without dead ends: 808 [2021-05-06 12:17:42,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 14 SyntacticMatches, 34 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1278.4ms TimeCoverageRelationStatistics Valid=198, Invalid=1694, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:17:42,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 808 states. [2021-05-06 12:17:44,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 808 to 661. [2021-05-06 12:17:44,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:17:44,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:17:44,605 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:17:44,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:44,605 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:17:44,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.1794871794871793) internal successors, (85), 38 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:44,606 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:17:44,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:17:44,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:44,606 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 14, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:44,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1198 [2021-05-06 12:17:44,606 INFO L428 AbstractCegarLoop]: === Iteration 258 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:44,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:44,606 INFO L82 PathProgramCache]: Analyzing trace with hash -229444289, now seen corresponding path program 240 times [2021-05-06 12:17:44,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:44,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310275862] [2021-05-06 12:17:44,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:44,629 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:17:44,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,631 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:44,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:44,657 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:17:44,669 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:44,671 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:17:44,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,681 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,690 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:44,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:44,701 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:17:44,711 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:44,711 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:44,714 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:17:44,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:44,736 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:44,743 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:17:44,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:44,758 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:17:44,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:44,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:44,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:44,787 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:17:44,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:44,798 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:44,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:44,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:44,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:44,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:17:44,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:44,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:17:44,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:17:46,246 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:46,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310275862] [2021-05-06 12:17:46,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1310275862] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:46,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:46,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:17:46,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65184423] [2021-05-06 12:17:46,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:17:46,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:46,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:17:46,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1551, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:17:46,247 INFO L87 Difference]: Start difference. First operand 661 states and 775 transitions. Second operand has 40 states, 40 states have (on average 2.125) internal successors, (85), 39 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:51,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:51,033 INFO L93 Difference]: Finished difference Result 1330 states and 1538 transitions. [2021-05-06 12:17:51,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:17:51,034 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.125) internal successors, (85), 39 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 91 [2021-05-06 12:17:51,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:51,034 INFO L225 Difference]: With dead ends: 1330 [2021-05-06 12:17:51,034 INFO L226 Difference]: Without dead ends: 799 [2021-05-06 12:17:51,035 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 12 SyntacticMatches, 35 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 1449.9ms TimeCoverageRelationStatistics Valid=208, Invalid=1772, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:17:51,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-05-06 12:17:53,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 661. [2021-05-06 12:17:53,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 646 states have (on average 1.173374613003096) internal successors, (758), 649 states have internal predecessors, (758), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:17:53,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 775 transitions. [2021-05-06 12:17:53,075 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 775 transitions. Word has length 91 [2021-05-06 12:17:53,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:53,076 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 775 transitions. [2021-05-06 12:17:53,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.125) internal successors, (85), 39 states have internal predecessors, (85), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:17:53,076 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 775 transitions. [2021-05-06 12:17:53,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:17:53,076 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:53,076 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 13, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:53,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1203 [2021-05-06 12:17:53,076 INFO L428 AbstractCegarLoop]: === Iteration 259 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:53,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:53,076 INFO L82 PathProgramCache]: Analyzing trace with hash -710524547, now seen corresponding path program 241 times [2021-05-06 12:17:53,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:53,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933295201] [2021-05-06 12:17:53,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:53,082 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:17:53,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,100 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:53,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:53,109 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:17:53,121 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:53,123 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:17:53,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:17:53,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:17:53,156 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:17:53,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:53,166 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:53,169 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:17:53,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:53,179 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:53,194 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:17:53,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:53,208 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:17:53,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:53,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:17:53,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:17:53,235 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:17:53,245 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:53,246 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:17:53,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:53,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:53,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:53,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:17:53,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:53,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:17:53,291 WARN L159 QuantifierPusher]: Ignoring assumption.