/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/mono-crafted_13.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:55:23,768 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:55:23,770 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:55:23,795 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:55:23,857 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:55:23,858 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:55:23,859 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:55:23,865 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 11:55:23,884 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:55:23,884 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:55:23,887 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:55:23,887 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:55:23,888 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:55:23,888 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:55:23,888 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:55:23,888 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:55:23,888 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:55:23,888 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:55:23,889 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:55:23,889 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:55:23,889 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:55:23,890 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:55:23,890 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:55:23,890 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:55:23,890 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:55:23,890 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:55:23,890 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:55:23,891 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:55:23,891 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:55:23,891 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:55:23,891 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:55:23,891 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:55:24,217 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:55:24,237 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:55:24,240 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:55:24,241 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:55:24,241 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:55:24,242 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c [2021-05-06 11:55:24,306 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb983b26e/9e26bbf182f846eba8a1b1fb26c25354/FLAG53c5571dc [2021-05-06 11:55:24,765 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:55:24,766 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c [2021-05-06 11:55:24,772 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb983b26e/9e26bbf182f846eba8a1b1fb26c25354/FLAG53c5571dc [2021-05-06 11:55:25,167 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb983b26e/9e26bbf182f846eba8a1b1fb26c25354 [2021-05-06 11:55:25,171 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:55:25,173 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:55:25,177 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:25,177 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:55:25,181 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:55:25,182 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,183 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@113287b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25, skipping insertion in model container [2021-05-06 11:55:25,183 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,190 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:55:25,203 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:55:25,345 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/mono-crafted_13.c[319,332] [2021-05-06 11:55:25,371 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:25,379 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:55:25,389 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/mono-crafted_13.c[319,332] [2021-05-06 11:55:25,394 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:25,407 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:55:25,408 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25 WrapperNode [2021-05-06 11:55:25,408 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:25,409 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:55:25,410 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:55:25,410 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:55:25,459 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,459 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,473 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,474 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,488 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,492 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,493 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (1/1) ... [2021-05-06 11:55:25,494 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:55:25,495 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:55:25,495 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:55:25,495 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:55:25,496 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (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 11:55:25,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:55:25,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:55:25,581 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:55:25,581 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:55:25,582 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:55:25,582 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:55:25,582 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:55:25,582 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:55:25,582 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:55:25,583 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:55:25,583 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:55:25,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:55:25,583 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:55:25,584 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:55:25,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:55:25,584 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:55:25,584 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:55:25,858 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:55:25,858 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:55:25,860 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:25 BoogieIcfgContainer [2021-05-06 11:55:25,860 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:55:25,861 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:55:25,861 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:55:25,863 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:55:25,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:55:25" (1/3) ... [2021-05-06 11:55:25,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1370977c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:25, skipping insertion in model container [2021-05-06 11:55:25,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:25" (2/3) ... [2021-05-06 11:55:25,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1370977c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:25, skipping insertion in model container [2021-05-06 11:55:25,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:25" (3/3) ... [2021-05-06 11:55:25,866 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_13.c [2021-05-06 11:55:25,878 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:55:25,881 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:55:25,900 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:55:25,923 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:55:25,923 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:55:25,923 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:55:25,923 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:55:25,923 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:55:25,924 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:55:25,924 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:55:25,924 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:55:25,946 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:55:25,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:55:25,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:25,969 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:25,970 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:25,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:25,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1168619535, now seen corresponding path program 1 times [2021-05-06 11:55:25,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:25,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650118003] [2021-05-06 11:55:25,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:26,039 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:26,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:26,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:26,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:26,244 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:26,245 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:26,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650118003] [2021-05-06 11:55:26,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1650118003] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:26,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:26,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:55:26,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619688311] [2021-05-06 11:55:26,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:55:26,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:26,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:55:26,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:26,269 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:26,346 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-06 11:55:26,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:55:26,348 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:55:26,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:26,353 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:55:26,353 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:55:26,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:26,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:55:26,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:55:26,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-05-06 11:55:26,393 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 12 [2021-05-06 11:55:26,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:26,393 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-05-06 11:55:26,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,394 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-05-06 11:55:26,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:55:26,395 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:26,395 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:26,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:55:26,395 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:26,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:26,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1458605129, now seen corresponding path program 1 times [2021-05-06 11:55:26,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:26,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420433862] [2021-05-06 11:55:26,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:26,402 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:26,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:26,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:26,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:26,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:26,531 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:26,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420433862] [2021-05-06 11:55:26,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1420433862] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:26,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:26,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:55:26,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35233032] [2021-05-06 11:55:26,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:55:26,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:26,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:55:26,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:55:26,535 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:26,631 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-05-06 11:55:26,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:55:26,632 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:55:26,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:26,633 INFO L225 Difference]: With dead ends: 24 [2021-05-06 11:55:26,633 INFO L226 Difference]: Without dead ends: 16 [2021-05-06 11:55:26,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:55:26,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-06 11:55:26,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-06 11:55:26,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-06 11:55:26,641 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2021-05-06 11:55:26,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:26,641 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-06 11:55:26,641 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,641 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-06 11:55:26,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:55:26,642 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:26,642 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:26,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:55:26,642 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:26,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:26,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1316432198, now seen corresponding path program 1 times [2021-05-06 11:55:26,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:26,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143007264] [2021-05-06 11:55:26,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:26,683 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:26,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:26,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:26,720 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:26,732 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 11:55:26,735 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:55:26,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:26,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:26,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:26,793 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:26,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:26,826 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:26,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143007264] [2021-05-06 11:55:26,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1143007264] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:26,827 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:26,827 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:55:26,827 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414338680] [2021-05-06 11:55:26,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:55:26,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:26,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:55:26,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:55:26,829 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:26,966 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-05-06 11:55:26,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:55:26,966 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:55:26,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:26,967 INFO L225 Difference]: With dead ends: 26 [2021-05-06 11:55:26,967 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:55:26,968 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 116.8ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:55:26,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:55:26,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 11:55:26,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-05-06 11:55:26,974 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2021-05-06 11:55:26,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:26,975 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-05-06 11:55:26,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,975 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-05-06 11:55:26,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:55:26,976 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:26,976 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:26,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:55:26,976 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:26,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:26,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1342594849, now seen corresponding path program 1 times [2021-05-06 11:55:26,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:26,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [435679231] [2021-05-06 11:55:26,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:26,992 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:26,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,002 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:27,021 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:27,032 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 11:55:27,047 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:27,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,095 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:27,100 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:27,125 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:27,162 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:27,166 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:27,178 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:27,195 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:27,221 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:27,240 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:27,262 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:27,270 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:27,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:27,295 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:27,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:27,308 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:27,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:27,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:27,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:27,456 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:27,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:27,601 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:27,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [435679231] [2021-05-06 11:55:27,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [435679231] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:27,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:27,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:55:27,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261856011] [2021-05-06 11:55:27,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:55:27,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:27,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:55:27,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:55:27,604 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:27,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:27,853 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2021-05-06 11:55:27,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:55:27,854 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 11:55:27,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:27,856 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:55:27,856 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 11:55:27,857 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 278.8ms TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:55:27,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 11:55:27,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 11:55:27,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:27,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-06 11:55:27,868 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 19 [2021-05-06 11:55:27,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:27,868 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-06 11:55:27,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:27,869 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-06 11:55:27,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:55:27,870 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:27,870 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:27,870 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:55:27,870 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:27,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:27,871 INFO L82 PathProgramCache]: Analyzing trace with hash 952217402, now seen corresponding path program 2 times [2021-05-06 11:55:27,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:27,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1471865489] [2021-05-06 11:55:27,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:27,887 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:27,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:27,917 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:27,945 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 11:55:27,954 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:27,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:27,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:27,984 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:28,021 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:28,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:28,047 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:28,068 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:28,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:28,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:28,091 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:28,096 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:28,127 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:28,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:28,170 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:28,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:28,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:28,201 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:28,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:28,212 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:28,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:28,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:28,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:28,368 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:28,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:28,499 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:28,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1471865489] [2021-05-06 11:55:28,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1471865489] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:28,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:28,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:55:28,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047767372] [2021-05-06 11:55:28,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:55:28,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:28,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:55:28,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:55:28,501 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:28,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:28,804 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2021-05-06 11:55:28,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:55:28,805 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-06 11:55:28,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:28,805 INFO L225 Difference]: With dead ends: 41 [2021-05-06 11:55:28,818 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 11:55:28,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 358.8ms TimeCoverageRelationStatistics Valid=111, Invalid=269, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:55:28,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 11:55:28,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-06 11:55:28,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:28,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-05-06 11:55:28,828 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2021-05-06 11:55:28,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:28,828 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-05-06 11:55:28,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:28,828 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-05-06 11:55:28,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 11:55:28,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:28,829 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:28,829 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:55:28,829 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:28,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:28,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1246825262, now seen corresponding path program 3 times [2021-05-06 11:55:28,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:28,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140700773] [2021-05-06 11:55:28,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:28,844 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:28,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:28,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:28,869 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:28,878 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:28,895 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:28,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:28,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:28,916 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:28,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:28,947 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:28,968 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:28,971 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:28,979 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:28,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:28,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:29,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:29,034 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:29,053 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:29,066 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:29,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:29,089 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:29,098 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 11:55:29,099 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:29,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:29,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:29,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:29,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:29,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:29,361 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:29,361 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140700773] [2021-05-06 11:55:29,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1140700773] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:29,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:29,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:55:29,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827015820] [2021-05-06 11:55:29,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:55:29,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:29,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:55:29,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:55:29,363 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:29,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:29,747 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2021-05-06 11:55:29,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:55:29,748 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-06 11:55:29,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:29,750 INFO L225 Difference]: With dead ends: 44 [2021-05-06 11:55:29,750 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 11:55:29,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 394.2ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:55:29,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 11:55:29,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-06 11:55:29,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:29,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-05-06 11:55:29,762 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2021-05-06 11:55:29,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:29,762 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-05-06 11:55:29,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:29,762 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-05-06 11:55:29,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:55:29,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:29,763 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:29,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:55:29,763 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:29,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:29,764 INFO L82 PathProgramCache]: Analyzing trace with hash 2108341683, now seen corresponding path program 4 times [2021-05-06 11:55:29,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:29,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053301067] [2021-05-06 11:55:29,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:29,774 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:29,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:29,805 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:29,814 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 11:55:29,821 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:29,834 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:29,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:29,869 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:29,889 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:29,890 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:29,898 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:29,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:29,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:29,949 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:29,968 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:29,974 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:29,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:29,996 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:30,005 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:30,007 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:30,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:30,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:30,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:30,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:30,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:30,262 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:30,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053301067] [2021-05-06 11:55:30,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2053301067] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:30,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:30,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:55:30,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043243930] [2021-05-06 11:55:30,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:55:30,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:30,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:55:30,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:55:30,264 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:30,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:30,682 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2021-05-06 11:55:30,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:55:30,682 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 11:55:30,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:30,683 INFO L225 Difference]: With dead ends: 46 [2021-05-06 11:55:30,683 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:55:30,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 408.7ms TimeCoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:55:30,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:55:30,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 11:55:30,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:30,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-06 11:55:30,691 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 26 [2021-05-06 11:55:30,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:30,692 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-06 11:55:30,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:30,692 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-06 11:55:30,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 11:55:30,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:30,693 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:30,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:55:30,693 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:30,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:30,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1096934136, now seen corresponding path program 5 times [2021-05-06 11:55:30,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:30,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009631711] [2021-05-06 11:55:30,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:30,702 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:30,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:30,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:30,724 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:30,734 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:30,741 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:30,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:30,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:30,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:30,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:30,790 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:30,809 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:30,812 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:30,816 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:30,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:30,821 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:30,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:30,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:30,867 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:30,887 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:30,893 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:30,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:30,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:30,915 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:30,924 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 11:55:30,926 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:30,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:30,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:30,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:30,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:30,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:30,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:31,139 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:31,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009631711] [2021-05-06 11:55:31,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2009631711] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:31,140 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:31,140 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:55:31,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352216779] [2021-05-06 11:55:31,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:55:31,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:31,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:55:31,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:55:31,141 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:31,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:31,604 INFO L93 Difference]: Finished difference Result 59 states and 79 transitions. [2021-05-06 11:55:31,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:55:31,604 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-06 11:55:31,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:31,605 INFO L225 Difference]: With dead ends: 59 [2021-05-06 11:55:31,605 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 11:55:31,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 471.6ms TimeCoverageRelationStatistics Valid=171, Invalid=429, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:55:31,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 11:55:31,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2021-05-06 11:55:31,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:31,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-06 11:55:31,612 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 28 [2021-05-06 11:55:31,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:31,612 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-06 11:55:31,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:31,612 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-06 11:55:31,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:55:31,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:31,613 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:31,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:55:31,613 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:31,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:31,613 INFO L82 PathProgramCache]: Analyzing trace with hash 445199841, now seen corresponding path program 6 times [2021-05-06 11:55:31,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:31,613 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093688376] [2021-05-06 11:55:31,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:31,623 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:31,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:31,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:31,642 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:31,650 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:31,656 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:31,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:31,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:31,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:31,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:31,701 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:31,719 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:31,721 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:31,725 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:31,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:31,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:31,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:31,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:31,782 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:31,804 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:31,809 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:31,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:31,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:31,828 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:31,837 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 11:55:31,839 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:31,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:31,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:31,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:31,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:31,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:32,204 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:32,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093688376] [2021-05-06 11:55:32,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1093688376] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:32,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:32,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:55:32,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039091612] [2021-05-06 11:55:32,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:55:32,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:32,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:55:32,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:55:32,206 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:32,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:32,819 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2021-05-06 11:55:32,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:55:32,822 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-06 11:55:32,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:32,823 INFO L225 Difference]: With dead ends: 78 [2021-05-06 11:55:32,823 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 11:55:32,824 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 601.5ms TimeCoverageRelationStatistics Valid=114, Invalid=756, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:55:32,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 11:55:32,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-06 11:55:32,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:32,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-06 11:55:32,833 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 33 [2021-05-06 11:55:32,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:32,833 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-06 11:55:32,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:32,833 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-06 11:55:32,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:55:32,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:32,834 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:32,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:55:32,834 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:32,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:32,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1776318212, now seen corresponding path program 7 times [2021-05-06 11:55:32,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:32,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750886991] [2021-05-06 11:55:32,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:32,844 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:32,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:32,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:32,867 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:32,875 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 11:55:32,881 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:32,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:32,885 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:32,895 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:32,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:32,918 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:32,934 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:32,935 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:32,939 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:32,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:32,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:32,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:32,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:32,986 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:33,002 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,006 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:33,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:33,031 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:33,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:33,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:33,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:33,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:33,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:33,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:33,408 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:33,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750886991] [2021-05-06 11:55:33,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [750886991] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:33,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:33,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:55:33,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552608213] [2021-05-06 11:55:33,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:55:33,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:33,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:55:33,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:55:33,410 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:34,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:34,149 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2021-05-06 11:55:34,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:55:34,150 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 11:55:34,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:34,150 INFO L225 Difference]: With dead ends: 81 [2021-05-06 11:55:34,150 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 11:55:34,152 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 770.6ms TimeCoverageRelationStatistics Valid=302, Invalid=958, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:55:34,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 11:55:34,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 11:55:34,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.1) internal successors, (55), 50 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:34,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-05-06 11:55:34,166 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 35 [2021-05-06 11:55:34,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:34,166 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-05-06 11:55:34,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:34,167 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-05-06 11:55:34,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:55:34,167 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:34,167 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:34,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:55:34,168 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:34,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:34,168 INFO L82 PathProgramCache]: Analyzing trace with hash 710995180, now seen corresponding path program 8 times [2021-05-06 11:55:34,168 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:34,168 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020574830] [2021-05-06 11:55:34,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:34,177 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:34,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:34,197 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:34,206 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 11:55:34,216 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:34,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,259 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:34,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:34,275 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:34,295 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:34,297 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:34,302 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:34,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:34,320 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:34,342 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:34,362 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:34,366 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:34,375 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:34,385 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:34,397 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:34,399 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:34,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:34,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:34,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:34,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:34,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:34,755 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:34,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020574830] [2021-05-06 11:55:34,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1020574830] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:34,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:34,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:55:34,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775960092] [2021-05-06 11:55:34,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:55:34,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:34,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:55:34,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:55:34,756 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 19 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:35,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:35,417 INFO L93 Difference]: Finished difference Result 84 states and 93 transitions. [2021-05-06 11:55:35,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:55:35,417 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 19 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-06 11:55:35,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:35,418 INFO L225 Difference]: With dead ends: 84 [2021-05-06 11:55:35,418 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 11:55:35,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 630.3ms TimeCoverageRelationStatistics Valid=136, Invalid=1054, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:55:35,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 11:55:35,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-06 11:55:35,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 52 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:35,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2021-05-06 11:55:35,427 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 38 [2021-05-06 11:55:35,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:35,428 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2021-05-06 11:55:35,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 19 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:35,428 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2021-05-06 11:55:35,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 11:55:35,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:35,429 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:35,429 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:55:35,429 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:35,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:35,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1289310897, now seen corresponding path program 9 times [2021-05-06 11:55:35,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:35,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2090874767] [2021-05-06 11:55:35,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:35,437 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:35,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:35,455 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:35,463 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:35,469 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:35,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,492 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:35,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:35,508 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:35,524 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:35,525 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:35,532 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:35,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:35,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:35,571 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:35,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:35,600 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:35,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:35,617 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:35,628 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:35,631 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:35,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:35,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:35,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:35,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:35,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:36,012 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:36,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2090874767] [2021-05-06 11:55:36,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2090874767] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:36,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:36,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:55:36,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794211768] [2021-05-06 11:55:36,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:55:36,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:36,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:55:36,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=405, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:55:36,014 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand has 21 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 20 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:36,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:36,794 INFO L93 Difference]: Finished difference Result 87 states and 97 transitions. [2021-05-06 11:55:36,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:55:36,794 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 20 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-06 11:55:36,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:36,795 INFO L225 Difference]: With dead ends: 87 [2021-05-06 11:55:36,795 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 11:55:36,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 829.0ms TimeCoverageRelationStatistics Valid=383, Invalid=1339, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:55:36,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 11:55:36,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 11:55:36,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:36,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-05-06 11:55:36,805 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 40 [2021-05-06 11:55:36,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:36,805 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-05-06 11:55:36,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 20 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:36,805 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-05-06 11:55:36,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 11:55:36,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:36,807 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:36,807 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:55:36,807 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:36,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:36,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1455796499, now seen corresponding path program 10 times [2021-05-06 11:55:36,807 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:36,808 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237139129] [2021-05-06 11:55:36,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:36,814 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:36,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:36,831 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:36,839 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:36,858 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:36,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:36,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:36,895 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:36,911 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:36,913 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:36,916 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:36,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,928 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,938 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:36,941 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:36,953 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:36,974 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:36,978 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:36,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,985 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:37,000 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:37,010 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,011 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:37,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:37,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:37,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:37,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:37,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:37,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:37,335 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:37,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237139129] [2021-05-06 11:55:37,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [237139129] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:37,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:37,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:55:37,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494996388] [2021-05-06 11:55:37,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:55:37,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:37,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:55:37,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=351, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:55:37,337 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:38,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:38,210 INFO L93 Difference]: Finished difference Result 101 states and 121 transitions. [2021-05-06 11:55:38,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:55:38,210 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-06 11:55:38,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:38,211 INFO L225 Difference]: With dead ends: 101 [2021-05-06 11:55:38,211 INFO L226 Difference]: Without dead ends: 73 [2021-05-06 11:55:38,212 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 833.4ms TimeCoverageRelationStatistics Valid=459, Invalid=1347, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:55:38,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-06 11:55:38,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 49. [2021-05-06 11:55:38,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:38,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-05-06 11:55:38,219 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 43 [2021-05-06 11:55:38,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:38,220 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-05-06 11:55:38,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:38,220 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-05-06 11:55:38,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-06 11:55:38,220 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:38,220 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:38,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:55:38,221 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:38,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:38,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1239490336, now seen corresponding path program 11 times [2021-05-06 11:55:38,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:38,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029099796] [2021-05-06 11:55:38,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:38,228 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:38,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:38,254 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:38,263 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:38,269 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:38,282 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,284 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:38,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:38,309 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:38,324 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:38,326 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:38,346 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:38,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:38,375 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:38,390 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:38,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:38,414 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:38,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,419 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:38,438 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:38,449 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:38,450 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:38,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:38,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:38,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:38,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:39,045 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:39,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029099796] [2021-05-06 11:55:39,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1029099796] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:39,046 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:39,046 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:55:39,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804051883] [2021-05-06 11:55:39,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:55:39,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:39,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:55:39,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:55:39,047 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 26 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 25 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:40,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:40,049 INFO L93 Difference]: Finished difference Result 120 states and 130 transitions. [2021-05-06 11:55:40,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:55:40,051 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 25 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-06 11:55:40,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:40,052 INFO L225 Difference]: With dead ends: 120 [2021-05-06 11:55:40,053 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 11:55:40,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 986.4ms TimeCoverageRelationStatistics Valid=183, Invalid=1797, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:55:40,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 11:55:40,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-06 11:55:40,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:40,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2021-05-06 11:55:40,080 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 48 [2021-05-06 11:55:40,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:40,080 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2021-05-06 11:55:40,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 25 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:40,081 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2021-05-06 11:55:40,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:55:40,082 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:40,082 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:40,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:55:40,082 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:40,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:40,082 INFO L82 PathProgramCache]: Analyzing trace with hash -249916315, now seen corresponding path program 12 times [2021-05-06 11:55:40,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:40,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725607625] [2021-05-06 11:55:40,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:40,093 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:40,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:40,111 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:40,118 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,124 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:40,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,130 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:40,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:40,173 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:40,190 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,191 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:40,208 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:40,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:40,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:40,251 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:40,267 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,271 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:40,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:40,290 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:40,298 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,299 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:40,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:40,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:40,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:40,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:40,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:40,868 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:40,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725607625] [2021-05-06 11:55:40,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [725607625] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:40,868 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:40,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:55:40,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946743561] [2021-05-06 11:55:40,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:55:40,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:40,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:55:40,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=768, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:55:40,870 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 26 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:42,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:42,010 INFO L93 Difference]: Finished difference Result 122 states and 131 transitions. [2021-05-06 11:55:42,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:55:42,011 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 11:55:42,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:42,011 INFO L225 Difference]: With dead ends: 122 [2021-05-06 11:55:42,011 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 11:55:42,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 1058.0ms TimeCoverageRelationStatistics Valid=191, Invalid=1971, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:55:42,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 11:55:42,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-06 11:55:42,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 76 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:42,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 85 transitions. [2021-05-06 11:55:42,028 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 85 transitions. Word has length 50 [2021-05-06 11:55:42,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:42,029 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 85 transitions. [2021-05-06 11:55:42,029 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:42,029 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 85 transitions. [2021-05-06 11:55:42,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:55:42,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:42,033 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:42,034 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:55:42,034 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:42,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:42,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1542945450, now seen corresponding path program 13 times [2021-05-06 11:55:42,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:42,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869643749] [2021-05-06 11:55:42,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:42,041 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:42,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:42,058 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:42,066 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,072 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:42,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:42,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:42,110 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:42,129 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,131 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:42,138 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:42,140 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:42,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:42,181 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:42,199 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,212 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:42,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:42,233 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:42,242 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,243 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:42,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:42,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,399 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 11:55:42,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,861 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:42,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869643749] [2021-05-06 11:55:42,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1869643749] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:42,861 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:42,861 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:55:42,861 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540767360] [2021-05-06 11:55:42,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:55:42,862 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:42,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:55:42,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=825, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:55:42,863 INFO L87 Difference]: Start difference. First operand 81 states and 85 transitions. Second operand has 28 states, 28 states have (on average 1.7142857142857142) internal successors, (48), 27 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:43,980 INFO L93 Difference]: Finished difference Result 124 states and 133 transitions. [2021-05-06 11:55:43,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:55:43,980 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.7142857142857142) internal successors, (48), 27 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-06 11:55:43,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:43,981 INFO L225 Difference]: With dead ends: 124 [2021-05-06 11:55:43,981 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 11:55:43,982 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 1120.8ms TimeCoverageRelationStatistics Valid=199, Invalid=2153, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:55:43,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 11:55:43,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-06 11:55:43,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.064102564102564) internal successors, (83), 78 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-05-06 11:55:43,992 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 52 [2021-05-06 11:55:43,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:43,992 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-05-06 11:55:43,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.7142857142857142) internal successors, (48), 27 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,992 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-05-06 11:55:43,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:55:43,993 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:43,993 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:43,993 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:55:43,993 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:43,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:43,993 INFO L82 PathProgramCache]: Analyzing trace with hash -2093751377, now seen corresponding path program 14 times [2021-05-06 11:55:43,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:43,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [733902106] [2021-05-06 11:55:43,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:44,002 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:44,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,019 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:44,028 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 11:55:44,033 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:44,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:44,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:44,069 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:44,085 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,087 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:44,091 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:44,103 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:44,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:44,138 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:44,159 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,164 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:44,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,182 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:44,190 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 11:55:44,191 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:44,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:44,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,318 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:44,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:44,741 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:44,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [733902106] [2021-05-06 11:55:44,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [733902106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:44,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:44,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:55:44,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117629287] [2021-05-06 11:55:44,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:55:44,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:44,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:55:44,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=884, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:55:44,743 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 29 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 28 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:45,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:45,908 INFO L93 Difference]: Finished difference Result 126 states and 135 transitions. [2021-05-06 11:55:45,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:55:45,909 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 28 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-06 11:55:45,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:45,910 INFO L225 Difference]: With dead ends: 126 [2021-05-06 11:55:45,910 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 11:55:45,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1121.1ms TimeCoverageRelationStatistics Valid=207, Invalid=2343, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:55:45,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 11:55:45,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-06 11:55:45,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0625) internal successors, (85), 80 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:45,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 89 transitions. [2021-05-06 11:55:45,919 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 89 transitions. Word has length 54 [2021-05-06 11:55:45,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:45,919 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 89 transitions. [2021-05-06 11:55:45,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 28 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:45,919 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 89 transitions. [2021-05-06 11:55:45,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:55:45,920 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:45,920 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:45,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:55:45,920 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:45,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:45,920 INFO L82 PathProgramCache]: Analyzing trace with hash -856023180, now seen corresponding path program 15 times [2021-05-06 11:55:45,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:45,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690923336] [2021-05-06 11:55:45,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:45,928 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:45,935 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,941 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:45,947 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:45,954 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 11:55:45,960 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:45,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:45,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:45,996 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:46,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,013 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,025 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:46,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:46,042 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:46,063 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:46,079 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,082 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:46,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:46,097 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:46,104 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,105 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:46,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:46,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:46,681 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:46,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690923336] [2021-05-06 11:55:46,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [690923336] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:46,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:46,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:55:46,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755426116] [2021-05-06 11:55:46,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:55:46,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:46,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:55:46,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=945, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:55:46,682 INFO L87 Difference]: Start difference. First operand 85 states and 89 transitions. Second operand has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 29 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:47,947 INFO L93 Difference]: Finished difference Result 128 states and 137 transitions. [2021-05-06 11:55:47,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:55:47,948 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-06 11:55:47,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:47,948 INFO L225 Difference]: With dead ends: 128 [2021-05-06 11:55:47,948 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:55:47,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 471 ImplicationChecksByTransitivity, 1201.9ms TimeCoverageRelationStatistics Valid=215, Invalid=2541, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:55:47,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:55:47,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-06 11:55:47,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 82 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-05-06 11:55:47,958 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 56 [2021-05-06 11:55:47,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:47,959 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-05-06 11:55:47,959 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,959 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-05-06 11:55:47,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:55:47,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:47,959 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:47,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:55:47,960 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:47,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:47,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1105166855, now seen corresponding path program 16 times [2021-05-06 11:55:47,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:47,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173809795] [2021-05-06 11:55:47,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:47,968 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:47,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,986 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:47,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,998 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:48,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:48,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:48,032 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:48,048 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:48,050 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:48,054 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:48,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:48,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:48,089 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:48,105 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:48,108 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:48,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:48,123 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:48,131 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 11:55:48,132 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:48,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:48,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:48,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:48,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:48,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:48,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:48,731 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:48,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173809795] [2021-05-06 11:55:48,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [173809795] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:48,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:48,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:55:48,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754982836] [2021-05-06 11:55:48,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:55:48,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:48,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:55:48,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=683, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:55:48,734 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 31 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 30 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:50,108 INFO L93 Difference]: Finished difference Result 143 states and 165 transitions. [2021-05-06 11:55:50,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:55:50,109 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 30 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-06 11:55:50,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:50,109 INFO L225 Difference]: With dead ends: 143 [2021-05-06 11:55:50,109 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 11:55:50,110 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1424.4ms TimeCoverageRelationStatistics Valid=735, Invalid=2687, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:55:50,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 11:55:50,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 64. [2021-05-06 11:55:50,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0677966101694916) internal successors, (63), 59 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2021-05-06 11:55:50,116 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 58 [2021-05-06 11:55:50,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:50,116 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2021-05-06 11:55:50,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 30 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,117 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2021-05-06 11:55:50,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:55:50,117 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:50,117 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:50,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:55:50,117 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:50,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:50,118 INFO L82 PathProgramCache]: Analyzing trace with hash 154650752, now seen corresponding path program 17 times [2021-05-06 11:55:50,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:50,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1232256841] [2021-05-06 11:55:50,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:50,126 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:50,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,131 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:50,141 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:50,148 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 11:55:50,154 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:50,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:50,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:50,185 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:50,202 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,203 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:50,206 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:50,207 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:50,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:50,241 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:50,256 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,259 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:50,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:50,273 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:50,281 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 11:55:50,282 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:50,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:50,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:50,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:50,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:50,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:51,098 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:51,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1232256841] [2021-05-06 11:55:51,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1232256841] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:51,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:51,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:55:51,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304104618] [2021-05-06 11:55:51,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:55:51,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:51,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:55:51,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1203, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:55:51,100 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand has 34 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 33 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:52,677 INFO L93 Difference]: Finished difference Result 164 states and 174 transitions. [2021-05-06 11:55:52,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:55:52,678 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 33 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-06 11:55:52,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:52,678 INFO L225 Difference]: With dead ends: 164 [2021-05-06 11:55:52,678 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 11:55:52,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 1577.2ms TimeCoverageRelationStatistics Valid=248, Invalid=3292, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:55:52,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 11:55:52,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2021-05-06 11:55:52,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 103 states have internal predecessors, (108), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 112 transitions. [2021-05-06 11:55:52,690 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 112 transitions. Word has length 63 [2021-05-06 11:55:52,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:52,690 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 112 transitions. [2021-05-06 11:55:52,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 33 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,690 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 112 transitions. [2021-05-06 11:55:52,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:55:52,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:52,691 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:52,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:55:52,691 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:52,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:52,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1204288091, now seen corresponding path program 18 times [2021-05-06 11:55:52,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:52,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [15101164] [2021-05-06 11:55:52,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:52,698 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:52,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:52,712 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:52,720 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,723 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:52,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:52,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:52,764 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:52,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,782 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:52,785 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:52,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,787 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:52,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:52,817 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:52,833 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,840 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:52,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:52,854 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:52,861 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 11:55:52,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:52,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:53,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:53,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:53,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:53,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:53,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:53,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [15101164] [2021-05-06 11:55:53,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [15101164] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:53,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:53,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:55:53,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196097332] [2021-05-06 11:55:53,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:55:53,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:53,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:55:53,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=1069, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:55:53,583 INFO L87 Difference]: Start difference. First operand 108 states and 112 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:55,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:55,170 INFO L93 Difference]: Finished difference Result 167 states and 177 transitions. [2021-05-06 11:55:55,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:55:55,171 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 11:55:55,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:55,172 INFO L225 Difference]: With dead ends: 167 [2021-05-06 11:55:55,172 INFO L226 Difference]: Without dead ends: 111 [2021-05-06 11:55:55,173 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1254 ImplicationChecksByTransitivity, 1676.0ms TimeCoverageRelationStatistics Valid=930, Invalid=3900, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:55:55,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-06 11:55:55,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-06 11:55:55,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.0471698113207548) internal successors, (111), 106 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:55,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 115 transitions. [2021-05-06 11:55:55,181 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 115 transitions. Word has length 65 [2021-05-06 11:55:55,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:55,181 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 115 transitions. [2021-05-06 11:55:55,181 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:55,181 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 115 transitions. [2021-05-06 11:55:55,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:55:55,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:55,182 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:55,182 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:55:55,182 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:55,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:55,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1097814189, now seen corresponding path program 19 times [2021-05-06 11:55:55,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:55,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077556624] [2021-05-06 11:55:55,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:55,193 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:55,193 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:55,214 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:55,221 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:55,226 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:55,239 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:55,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:55,270 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:55,293 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:55,294 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:55,297 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:55,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:55,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:55,333 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:55,349 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:55,353 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:55,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:55,369 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:55,377 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 11:55:55,378 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:55,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:55,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:55,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:56,190 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:56,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077556624] [2021-05-06 11:55:56,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2077556624] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:56,190 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:56,190 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:55:56,190 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295866726] [2021-05-06 11:55:56,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:55:56,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:56,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:55:56,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1415, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:55:56,191 INFO L87 Difference]: Start difference. First operand 111 states and 115 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:57,962 INFO L93 Difference]: Finished difference Result 170 states and 179 transitions. [2021-05-06 11:55:57,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:55:57,962 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-06 11:55:57,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:57,963 INFO L225 Difference]: With dead ends: 170 [2021-05-06 11:55:57,963 INFO L226 Difference]: Without dead ends: 113 [2021-05-06 11:55:57,964 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 1660.2ms TimeCoverageRelationStatistics Valid=274, Invalid=3886, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:55:57,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-06 11:55:57,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-05-06 11:55:57,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 108 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 117 transitions. [2021-05-06 11:55:57,976 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 117 transitions. Word has length 68 [2021-05-06 11:55:57,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:57,976 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 117 transitions. [2021-05-06 11:55:57,976 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,976 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 117 transitions. [2021-05-06 11:55:57,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 11:55:57,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:57,977 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:57,977 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:55:57,977 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:57,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:57,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1341452366, now seen corresponding path program 20 times [2021-05-06 11:55:57,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:57,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1516717923] [2021-05-06 11:55:57,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:57,984 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:57,990 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:57,998 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:58,006 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 11:55:58,010 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:58,012 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:58,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:58,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:58,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:58,049 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:58,064 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:58,065 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:58,068 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:55:58,069 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:58,072 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:58,080 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:55:58,082 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:55:58,101 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:55:58,117 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:58,120 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:58,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:58,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:58,135 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:58,143 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 11:55:58,143 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:58,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:58,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:58,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:58,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:58,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:59,070 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:59,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1516717923] [2021-05-06 11:55:59,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1516717923] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:59,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:59,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:55:59,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643958220] [2021-05-06 11:55:59,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:55:59,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:59,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:55:59,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1492, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:55:59,072 INFO L87 Difference]: Start difference. First operand 113 states and 117 transitions. Second operand has 38 states, 38 states have (on average 1.736842105263158) internal successors, (66), 37 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:00,862 INFO L93 Difference]: Finished difference Result 172 states and 181 transitions. [2021-05-06 11:56:00,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:56:00,863 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.736842105263158) internal successors, (66), 37 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-06 11:56:00,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:00,863 INFO L225 Difference]: With dead ends: 172 [2021-05-06 11:56:00,863 INFO L226 Difference]: Without dead ends: 115 [2021-05-06 11:56:00,865 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 1827.4ms TimeCoverageRelationStatistics Valid=282, Invalid=4140, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:56:00,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-06 11:56:00,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-05-06 11:56:00,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0454545454545454) internal successors, (115), 110 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 119 transitions. [2021-05-06 11:56:00,874 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 119 transitions. Word has length 70 [2021-05-06 11:56:00,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:00,874 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 119 transitions. [2021-05-06 11:56:00,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.736842105263158) internal successors, (66), 37 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,874 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 119 transitions. [2021-05-06 11:56:00,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:56:00,875 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:00,875 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:00,875 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:56:00,875 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:00,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:00,875 INFO L82 PathProgramCache]: Analyzing trace with hash -424468105, now seen corresponding path program 21 times [2021-05-06 11:56:00,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:00,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553530386] [2021-05-06 11:56:00,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:00,882 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:00,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:00,897 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:00,905 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 11:56:00,908 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:00,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:00,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:00,946 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:00,966 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:00,967 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:00,970 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:00,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,983 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,991 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:00,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:01,006 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:01,024 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:01,026 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:01,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:01,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:01,040 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:01,047 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:01,048 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:01,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:01,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:01,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:01,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:01,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:01,783 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:01,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553530386] [2021-05-06 11:56:01,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1553530386] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:01,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:01,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:56:01,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048847073] [2021-05-06 11:56:01,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:56:01,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:01,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:56:01,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=1313, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:56:01,785 INFO L87 Difference]: Start difference. First operand 115 states and 119 transitions. Second operand has 39 states, 39 states have (on average 1.7435897435897436) internal successors, (68), 38 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:03,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:03,670 INFO L93 Difference]: Finished difference Result 175 states and 185 transitions. [2021-05-06 11:56:03,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:56:03,671 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7435897435897436) internal successors, (68), 38 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-05-06 11:56:03,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:03,671 INFO L225 Difference]: With dead ends: 175 [2021-05-06 11:56:03,672 INFO L226 Difference]: Without dead ends: 118 [2021-05-06 11:56:03,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1565 ImplicationChecksByTransitivity, 1906.5ms TimeCoverageRelationStatistics Valid=1139, Invalid=4867, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:56:03,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-06 11:56:03,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-05-06 11:56:03,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0442477876106195) internal successors, (118), 113 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:03,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 122 transitions. [2021-05-06 11:56:03,684 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 122 transitions. Word has length 72 [2021-05-06 11:56:03,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:03,685 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 122 transitions. [2021-05-06 11:56:03,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.7435897435897436) internal successors, (68), 38 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:03,685 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 122 transitions. [2021-05-06 11:56:03,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:56:03,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:03,685 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:03,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:56:03,685 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:03,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:03,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1648045287, now seen corresponding path program 22 times [2021-05-06 11:56:03,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:03,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697643152] [2021-05-06 11:56:03,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:03,694 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:03,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:03,708 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:03,715 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 11:56:03,719 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:03,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,730 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:03,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:03,753 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:03,768 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:03,769 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:03,773 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:03,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:03,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:03,803 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:03,818 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:03,822 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:03,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:03,835 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:03,843 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 11:56:03,844 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:03,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:04,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:04,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:04,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:04,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:04,782 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:04,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697643152] [2021-05-06 11:56:04,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [697643152] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:04,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:04,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:56:04,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589901776] [2021-05-06 11:56:04,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:56:04,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:04,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:56:04,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:56:04,783 INFO L87 Difference]: Start difference. First operand 118 states and 122 transitions. Second operand has 41 states, 41 states have (on average 1.7317073170731707) internal successors, (71), 40 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:06,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:06,858 INFO L93 Difference]: Finished difference Result 178 states and 187 transitions. [2021-05-06 11:56:06,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:56:06,858 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7317073170731707) internal successors, (71), 40 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-06 11:56:06,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:06,859 INFO L225 Difference]: With dead ends: 178 [2021-05-06 11:56:06,859 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 11:56:06,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 1927.0ms TimeCoverageRelationStatistics Valid=309, Invalid=4803, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:56:06,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 11:56:06,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-05-06 11:56:06,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 115 states have (on average 1.0434782608695652) internal successors, (120), 115 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:06,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 124 transitions. [2021-05-06 11:56:06,871 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 124 transitions. Word has length 75 [2021-05-06 11:56:06,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:06,871 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 124 transitions. [2021-05-06 11:56:06,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.7317073170731707) internal successors, (71), 40 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:06,871 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 124 transitions. [2021-05-06 11:56:06,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:56:06,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:06,872 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:06,872 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:56:06,872 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:06,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:06,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1730178626, now seen corresponding path program 23 times [2021-05-06 11:56:06,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:06,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1060217059] [2021-05-06 11:56:06,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:06,879 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:06,886 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:06,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:06,896 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:06,903 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:06,907 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:06,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:06,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:06,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:06,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:06,944 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:06,963 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:06,964 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:06,967 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:06,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:06,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:06,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:06,984 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:07,002 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:07,018 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,021 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:07,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:07,035 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:07,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,043 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:07,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:07,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:07,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:07,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:07,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:07,983 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:07,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1060217059] [2021-05-06 11:56:07,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1060217059] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:07,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:07,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:56:07,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112077404] [2021-05-06 11:56:07,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:56:07,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:07,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:56:07,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=1505, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:56:07,985 INFO L87 Difference]: Start difference. First operand 120 states and 124 transitions. Second operand has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 41 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:10,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:10,181 INFO L93 Difference]: Finished difference Result 181 states and 191 transitions. [2021-05-06 11:56:10,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:56:10,181 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 11:56:10,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:10,182 INFO L225 Difference]: With dead ends: 181 [2021-05-06 11:56:10,182 INFO L226 Difference]: Without dead ends: 123 [2021-05-06 11:56:10,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1835 ImplicationChecksByTransitivity, 2281.0ms TimeCoverageRelationStatistics Valid=1331, Invalid=5641, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:56:10,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-06 11:56:10,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-05-06 11:56:10,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0423728813559323) internal successors, (123), 118 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:10,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2021-05-06 11:56:10,194 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 77 [2021-05-06 11:56:10,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:10,195 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2021-05-06 11:56:10,195 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:10,195 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2021-05-06 11:56:10,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:56:10,195 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:10,196 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:10,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:56:10,196 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:10,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:10,196 INFO L82 PathProgramCache]: Analyzing trace with hash 834411046, now seen corresponding path program 24 times [2021-05-06 11:56:10,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:10,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [221667398] [2021-05-06 11:56:10,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:10,203 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:10,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:10,219 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:10,227 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,231 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:10,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,251 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:10,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:10,264 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:10,279 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,280 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:10,283 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:10,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:10,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:10,323 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:10,338 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,341 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:10,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:10,355 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:10,362 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,363 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:10,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:10,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:10,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:10,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:10,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:11,236 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:11,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [221667398] [2021-05-06 11:56:11,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [221667398] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:11,237 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:11,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:56:11,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037833922] [2021-05-06 11:56:11,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:56:11,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:11,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:56:11,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=1630, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:56:11,238 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 43 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:13,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:13,603 INFO L93 Difference]: Finished difference Result 185 states and 195 transitions. [2021-05-06 11:56:13,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:56:13,604 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-06 11:56:13,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:13,605 INFO L225 Difference]: With dead ends: 185 [2021-05-06 11:56:13,605 INFO L226 Difference]: Without dead ends: 126 [2021-05-06 11:56:13,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2046 ImplicationChecksByTransitivity, 2254.8ms TimeCoverageRelationStatistics Valid=1497, Invalid=6159, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:56:13,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-06 11:56:13,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-05-06 11:56:13,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.0413223140495869) internal successors, (126), 121 states have internal predecessors, (126), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:13,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 130 transitions. [2021-05-06 11:56:13,618 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 130 transitions. Word has length 80 [2021-05-06 11:56:13,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:13,618 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 130 transitions. [2021-05-06 11:56:13,618 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:13,618 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 130 transitions. [2021-05-06 11:56:13,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:56:13,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:13,619 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:13,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:56:13,619 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:13,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:13,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1340931864, now seen corresponding path program 25 times [2021-05-06 11:56:13,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:13,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642075577] [2021-05-06 11:56:13,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:13,626 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:13,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:13,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:13,643 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:13,652 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:13,659 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:13,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:13,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:13,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:13,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:13,693 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:13,709 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:13,710 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:13,712 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:13,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:13,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:13,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:13,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:13,741 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:13,756 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:13,759 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:13,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:13,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:13,773 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:13,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:13,781 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:13,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:13,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:13,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:13,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:13,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:14,878 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:14,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642075577] [2021-05-06 11:56:14,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1642075577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:14,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:14,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:56:14,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583922145] [2021-05-06 11:56:14,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:56:14,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:14,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:56:14,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2153, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:56:14,883 INFO L87 Difference]: Start difference. First operand 126 states and 130 transitions. Second operand has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 45 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:17,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:17,426 INFO L93 Difference]: Finished difference Result 188 states and 197 transitions. [2021-05-06 11:56:17,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:56:17,426 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 45 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:56:17,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:17,427 INFO L225 Difference]: With dead ends: 188 [2021-05-06 11:56:17,427 INFO L226 Difference]: Without dead ends: 128 [2021-05-06 11:56:17,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 2328.8ms TimeCoverageRelationStatistics Valid=358, Invalid=5962, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:56:17,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-06 11:56:17,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-05-06 11:56:17,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 123 states have (on average 1.0406504065040652) internal successors, (128), 123 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:17,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 132 transitions. [2021-05-06 11:56:17,440 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 132 transitions. Word has length 83 [2021-05-06 11:56:17,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:17,440 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 132 transitions. [2021-05-06 11:56:17,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 45 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:17,441 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 132 transitions. [2021-05-06 11:56:17,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 11:56:17,441 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:17,441 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:17,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:56:17,441 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:17,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:17,442 INFO L82 PathProgramCache]: Analyzing trace with hash -1269516941, now seen corresponding path program 26 times [2021-05-06 11:56:17,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:17,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562323131] [2021-05-06 11:56:17,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:17,448 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:17,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:17,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:17,464 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:17,472 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:17,476 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:17,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:17,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:17,499 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:17,501 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:17,511 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:17,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:17,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:17,532 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:17,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:17,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:17,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:17,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:17,569 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:17,584 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:17,597 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:17,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:17,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:17,616 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:17,624 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:17,625 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:17,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:17,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:17,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:17,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:17,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:18,708 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:18,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562323131] [2021-05-06 11:56:18,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [562323131] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:18,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:18,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:56:18,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700043197] [2021-05-06 11:56:18,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:56:18,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:18,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:56:18,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=1843, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:56:18,709 INFO L87 Difference]: Start difference. First operand 128 states and 132 transitions. Second operand has 47 states, 47 states have (on average 1.7234042553191489) internal successors, (81), 46 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:21,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:21,206 INFO L93 Difference]: Finished difference Result 191 states and 201 transitions. [2021-05-06 11:56:21,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:56:21,207 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.7234042553191489) internal successors, (81), 46 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-06 11:56:21,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:21,207 INFO L225 Difference]: With dead ends: 191 [2021-05-06 11:56:21,207 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 11:56:21,208 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2352 ImplicationChecksByTransitivity, 2623.2ms TimeCoverageRelationStatistics Valid=1716, Invalid=7026, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:56:21,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 11:56:21,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-05-06 11:56:21,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0396825396825398) internal successors, (131), 126 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:21,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 135 transitions. [2021-05-06 11:56:21,222 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 135 transitions. Word has length 85 [2021-05-06 11:56:21,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:21,222 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 135 transitions. [2021-05-06 11:56:21,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.7234042553191489) internal successors, (81), 46 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:21,222 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 135 transitions. [2021-05-06 11:56:21,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 11:56:21,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:21,223 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:21,223 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:56:21,223 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:21,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:21,223 INFO L82 PathProgramCache]: Analyzing trace with hash 427697173, now seen corresponding path program 27 times [2021-05-06 11:56:21,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:21,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406709608] [2021-05-06 11:56:21,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:21,230 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:21,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:21,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:21,246 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:21,253 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:21,256 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:21,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:21,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:21,274 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:21,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:21,288 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:21,303 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:21,304 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:21,307 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:21,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:21,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:21,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:21,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:21,335 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:21,350 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:21,362 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:21,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:21,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:21,378 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:21,386 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 11:56:21,386 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:21,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:21,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:21,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:21,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:21,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:22,429 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:22,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406709608] [2021-05-06 11:56:22,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1406709608] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:22,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:22,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:56:22,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666661410] [2021-05-06 11:56:22,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:56:22,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:22,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:56:22,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=706, Invalid=1946, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:56:22,430 INFO L87 Difference]: Start difference. First operand 131 states and 135 transitions. Second operand has 49 states, 49 states have (on average 1.7142857142857142) internal successors, (84), 48 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:25,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:25,502 INFO L93 Difference]: Finished difference Result 195 states and 205 transitions. [2021-05-06 11:56:25,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:56:25,503 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.7142857142857142) internal successors, (84), 48 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 88 [2021-05-06 11:56:25,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:25,503 INFO L225 Difference]: With dead ends: 195 [2021-05-06 11:56:25,504 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 11:56:25,505 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2594 ImplicationChecksByTransitivity, 2951.9ms TimeCoverageRelationStatistics Valid=1973, Invalid=7533, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:56:25,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 11:56:25,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-05-06 11:56:25,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 129 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:25,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 138 transitions. [2021-05-06 11:56:25,519 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 138 transitions. Word has length 88 [2021-05-06 11:56:25,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:25,519 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 138 transitions. [2021-05-06 11:56:25,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.7142857142857142) internal successors, (84), 48 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:25,519 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 138 transitions. [2021-05-06 11:56:25,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 11:56:25,520 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:25,520 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:25,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:56:25,520 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:25,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:25,520 INFO L82 PathProgramCache]: Analyzing trace with hash -813504503, now seen corresponding path program 28 times [2021-05-06 11:56:25,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:25,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509101112] [2021-05-06 11:56:25,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:25,528 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:25,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,534 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:25,545 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:25,554 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 11:56:25,558 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:25,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:25,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:25,604 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:25,626 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,627 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:25,631 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:25,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:25,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:25,673 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:25,689 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,692 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:25,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:25,706 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:25,713 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,714 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:25,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:25,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:25,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:25,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:25,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:27,060 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:27,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509101112] [2021-05-06 11:56:27,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1509101112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:27,060 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:27,060 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:56:27,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090492587] [2021-05-06 11:56:27,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:56:27,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:27,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:56:27,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=2625, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:56:27,061 INFO L87 Difference]: Start difference. First operand 134 states and 138 transitions. Second operand has 51 states, 51 states have (on average 1.7058823529411764) internal successors, (87), 50 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:30,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:30,063 INFO L93 Difference]: Finished difference Result 198 states and 207 transitions. [2021-05-06 11:56:30,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:56:30,063 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.7058823529411764) internal successors, (87), 50 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-06 11:56:30,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:30,064 INFO L225 Difference]: With dead ends: 198 [2021-05-06 11:56:30,064 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 11:56:30,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 2811.2ms TimeCoverageRelationStatistics Valid=411, Invalid=7245, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:56:30,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 11:56:30,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-05-06 11:56:30,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0381679389312977) internal successors, (136), 131 states have internal predecessors, (136), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:30,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 140 transitions. [2021-05-06 11:56:30,078 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 140 transitions. Word has length 91 [2021-05-06 11:56:30,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:30,078 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 140 transitions. [2021-05-06 11:56:30,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.7058823529411764) internal successors, (87), 50 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:30,079 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 140 transitions. [2021-05-06 11:56:30,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:56:30,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:30,079 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:30,079 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:56:30,079 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:30,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:30,080 INFO L82 PathProgramCache]: Analyzing trace with hash 942150500, now seen corresponding path program 29 times [2021-05-06 11:56:30,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:30,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1354251530] [2021-05-06 11:56:30,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:30,087 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:30,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:30,104 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:30,111 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,115 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:30,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:30,128 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:30,147 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:30,163 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,164 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:30,167 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:30,168 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:30,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:30,204 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:30,220 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,223 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:30,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:30,237 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:30,245 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 11:56:30,246 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:30,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:30,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:30,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:30,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:30,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:30,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:31,359 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:31,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1354251530] [2021-05-06 11:56:31,360 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1354251530] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:31,360 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:31,360 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:56:31,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19901049] [2021-05-06 11:56:31,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:56:31,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:31,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:56:31,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=716, Invalid=1936, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:56:31,361 INFO L87 Difference]: Start difference. First operand 136 states and 140 transitions. Second operand has 52 states, 52 states have (on average 1.7115384615384615) internal successors, (89), 51 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:34,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:34,385 INFO L93 Difference]: Finished difference Result 227 states and 263 transitions. [2021-05-06 11:56:34,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:56:34,386 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.7115384615384615) internal successors, (89), 51 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:56:34,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:34,386 INFO L225 Difference]: With dead ends: 227 [2021-05-06 11:56:34,386 INFO L226 Difference]: Without dead ends: 165 [2021-05-06 11:56:34,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2588 ImplicationChecksByTransitivity, 2975.9ms TimeCoverageRelationStatistics Valid=2142, Invalid=7958, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:56:34,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-06 11:56:34,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 99. [2021-05-06 11:56:34,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0425531914893618) internal successors, (98), 94 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:34,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-05-06 11:56:34,397 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 93 [2021-05-06 11:56:34,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:34,398 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-05-06 11:56:34,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.7115384615384615) internal successors, (89), 51 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:34,398 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-05-06 11:56:34,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:56:34,398 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:34,398 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:34,398 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:56:34,399 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:34,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:34,399 INFO L82 PathProgramCache]: Analyzing trace with hash -1374706487, now seen corresponding path program 30 times [2021-05-06 11:56:34,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:34,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888719046] [2021-05-06 11:56:34,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:34,408 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:34,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:34,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:34,424 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:34,432 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 11:56:34,436 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:34,447 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:34,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:34,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:34,462 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:34,475 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:34,493 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:34,494 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:34,497 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:34,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:34,499 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:34,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:34,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:34,532 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:34,550 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:34,553 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:34,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:34,559 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:34,569 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:34,577 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:34,578 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:34,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:34,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:34,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:34,785 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 11:56:34,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:34,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:35,747 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:35,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888719046] [2021-05-06 11:56:35,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [888719046] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:35,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:35,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:56:35,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081475115] [2021-05-06 11:56:35,748 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:56:35,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:35,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:56:35,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=803, Invalid=2167, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:56:35,749 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 55 states, 55 states have (on average 1.709090909090909) internal successors, (94), 54 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:39,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:39,088 INFO L93 Difference]: Finished difference Result 195 states and 206 transitions. [2021-05-06 11:56:39,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:56:39,088 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.709090909090909) internal successors, (94), 54 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-06 11:56:39,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:39,089 INFO L225 Difference]: With dead ends: 195 [2021-05-06 11:56:39,089 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 11:56:39,090 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2944 ImplicationChecksByTransitivity, 3206.7ms TimeCoverageRelationStatistics Valid=2403, Invalid=8939, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:56:39,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 11:56:39,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-05-06 11:56:39,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 99 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:39,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 107 transitions. [2021-05-06 11:56:39,100 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 107 transitions. Word has length 98 [2021-05-06 11:56:39,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:39,100 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 107 transitions. [2021-05-06 11:56:39,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.709090909090909) internal successors, (94), 54 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:39,100 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 107 transitions. [2021-05-06 11:56:39,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:56:39,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:39,100 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:39,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:56:39,101 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:39,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:39,101 INFO L82 PathProgramCache]: Analyzing trace with hash 844615088, now seen corresponding path program 31 times [2021-05-06 11:56:39,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:39,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819782331] [2021-05-06 11:56:39,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:39,108 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:39,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:39,123 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:39,131 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 11:56:39,137 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:39,138 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,140 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:39,152 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:39,176 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:39,197 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:39,199 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:39,202 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:39,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:39,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:39,242 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:39,263 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:39,267 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:39,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:39,284 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:39,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:39,295 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:39,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:39,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:39,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:39,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:39,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:40,876 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:40,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819782331] [2021-05-06 11:56:40,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1819782331] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:40,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:40,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:56:40,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709518168] [2021-05-06 11:56:40,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:56:40,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:40,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:56:40,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=3375, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:56:40,878 INFO L87 Difference]: Start difference. First operand 104 states and 107 transitions. Second operand has 58 states, 58 states have (on average 1.706896551724138) internal successors, (99), 57 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:44,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:44,604 INFO L93 Difference]: Finished difference Result 276 states and 286 transitions. [2021-05-06 11:56:44,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:56:44,604 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.706896551724138) internal successors, (99), 57 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 11:56:44,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:44,605 INFO L225 Difference]: With dead ends: 276 [2021-05-06 11:56:44,605 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 11:56:44,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1656 ImplicationChecksByTransitivity, 3363.7ms TimeCoverageRelationStatistics Valid=484, Invalid=9416, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:56:44,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 11:56:44,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2021-05-06 11:56:44,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.0285714285714285) internal successors, (180), 175 states have internal predecessors, (180), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:44,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 184 transitions. [2021-05-06 11:56:44,623 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 184 transitions. Word has length 103 [2021-05-06 11:56:44,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:44,624 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 184 transitions. [2021-05-06 11:56:44,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.706896551724138) internal successors, (99), 57 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:44,624 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 184 transitions. [2021-05-06 11:56:44,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 11:56:44,624 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:44,624 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:44,625 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:56:44,625 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:44,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:44,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1775777653, now seen corresponding path program 32 times [2021-05-06 11:56:44,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:44,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410077431] [2021-05-06 11:56:44,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:44,633 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:44,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:44,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:44,647 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:44,655 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:44,659 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:44,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:44,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:44,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:44,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:44,708 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:44,727 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:44,729 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:44,735 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:44,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:44,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:44,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:44,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:44,772 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:44,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:44,790 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:44,796 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:44,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:44,804 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:44,811 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:44,812 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:44,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:45,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:45,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:45,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:45,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:45,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:46,079 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:46,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410077431] [2021-05-06 11:56:46,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1410077431] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:46,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:46,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:56:46,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774651390] [2021-05-06 11:56:46,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:56:46,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:46,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:56:46,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=914, Invalid=2508, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:56:46,081 INFO L87 Difference]: Start difference. First operand 180 states and 184 transitions. Second operand has 59 states, 59 states have (on average 1.7118644067796611) internal successors, (101), 58 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:49,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:49,927 INFO L93 Difference]: Finished difference Result 283 states and 297 transitions. [2021-05-06 11:56:49,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:56:49,927 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.7118644067796611) internal successors, (101), 58 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-06 11:56:49,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:49,928 INFO L225 Difference]: With dead ends: 283 [2021-05-06 11:56:49,928 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 11:56:49,929 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3394 ImplicationChecksByTransitivity, 3562.4ms TimeCoverageRelationStatistics Valid=2736, Invalid=10374, Unknown=0, NotChecked=0, Total=13110 [2021-05-06 11:56:49,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 11:56:49,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 111. [2021-05-06 11:56:49,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 106 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:49,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2021-05-06 11:56:49,939 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 105 [2021-05-06 11:56:49,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:49,939 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2021-05-06 11:56:49,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.7118644067796611) internal successors, (101), 58 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:49,939 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2021-05-06 11:56:49,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:56:49,940 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:49,940 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:49,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:56:49,940 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:49,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:49,940 INFO L82 PathProgramCache]: Analyzing trace with hash 798651778, now seen corresponding path program 33 times [2021-05-06 11:56:49,940 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:49,940 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33600658] [2021-05-06 11:56:49,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:49,947 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:49,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,952 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:49,962 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:49,969 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:49,972 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:49,972 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:49,988 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:50,008 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:50,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:50,024 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:50,027 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:50,036 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:50,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:50,065 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:50,080 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:50,082 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:50,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:50,095 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:50,102 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 11:56:50,103 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:50,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:50,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:50,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:50,374 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 11:56:50,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:51,875 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:51,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33600658] [2021-05-06 11:56:51,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [33600658] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:51,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:51,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:56:51,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294724520] [2021-05-06 11:56:51,875 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:56:51,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:51,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:56:51,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=3848, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:56:51,876 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 62 states, 62 states have (on average 1.7096774193548387) internal successors, (106), 61 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:56,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:56,052 INFO L93 Difference]: Finished difference Result 296 states and 306 transitions. [2021-05-06 11:56:56,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:56:56,053 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.7096774193548387) internal successors, (106), 61 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2021-05-06 11:56:56,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:56,054 INFO L225 Difference]: With dead ends: 296 [2021-05-06 11:56:56,054 INFO L226 Difference]: Without dead ends: 193 [2021-05-06 11:56:56,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1888 ImplicationChecksByTransitivity, 3788.1ms TimeCoverageRelationStatistics Valid=526, Invalid=10816, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:56:56,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-06 11:56:56,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2021-05-06 11:56:56,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0265957446808511) internal successors, (193), 188 states have internal predecessors, (193), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:56,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 197 transitions. [2021-05-06 11:56:56,076 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 197 transitions. Word has length 110 [2021-05-06 11:56:56,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:56,077 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 197 transitions. [2021-05-06 11:56:56,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 1.7096774193548387) internal successors, (106), 61 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:56,077 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 197 transitions. [2021-05-06 11:56:56,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-06 11:56:56,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:56,077 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:56,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 11:56:56,078 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:56,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:56,078 INFO L82 PathProgramCache]: Analyzing trace with hash 2019466823, now seen corresponding path program 34 times [2021-05-06 11:56:56,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:56,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015379571] [2021-05-06 11:56:56,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:56,085 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:56,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:56,102 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:56,111 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,115 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:56,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:56,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:56,149 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:56,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,169 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:56,172 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:56:56,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:56:56,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:56:56,202 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:56:56,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,220 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:56,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:56,233 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:56,241 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 11:56:56,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:56,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:56,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:56,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:56,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:56,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:57,768 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:57,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015379571] [2021-05-06 11:56:57,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2015379571] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:57,769 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:57,769 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:56:57,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590087448] [2021-05-06 11:56:57,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:56:57,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:57,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:56:57,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=3213, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:56:57,771 INFO L87 Difference]: Start difference. First operand 193 states and 197 transitions. Second operand has 63 states, 63 states have (on average 1.7142857142857142) internal successors, (108), 62 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:01,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:01,933 INFO L93 Difference]: Finished difference Result 299 states and 309 transitions. [2021-05-06 11:57:01,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:57:01,933 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.7142857142857142) internal successors, (108), 62 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 112 [2021-05-06 11:57:01,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:01,934 INFO L225 Difference]: With dead ends: 299 [2021-05-06 11:57:01,934 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 11:57:01,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4313 ImplicationChecksByTransitivity, 4043.9ms TimeCoverageRelationStatistics Valid=3095, Invalid=12655, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 11:57:01,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 11:57:01,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 11:57:01,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0261780104712042) internal successors, (196), 191 states have internal predecessors, (196), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:01,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 200 transitions. [2021-05-06 11:57:01,951 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 200 transitions. Word has length 112 [2021-05-06 11:57:01,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:01,951 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 200 transitions. [2021-05-06 11:57:01,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.7142857142857142) internal successors, (108), 62 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:01,951 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 200 transitions. [2021-05-06 11:57:01,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 11:57:01,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:01,951 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:01,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:57:01,952 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:01,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:01,952 INFO L82 PathProgramCache]: Analyzing trace with hash 2027410199, now seen corresponding path program 35 times [2021-05-06 11:57:01,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:01,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358691330] [2021-05-06 11:57:01,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:01,958 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:01,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:01,971 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:01,979 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 11:57:01,981 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:01,990 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:02,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:02,011 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:02,026 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:02,027 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:02,029 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:02,030 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,031 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,038 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:02,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:02,058 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:02,074 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:02,077 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:02,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,082 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:02,091 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:02,098 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 11:57:02,099 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:02,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:02,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:02,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:02,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:02,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:03,710 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:03,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358691330] [2021-05-06 11:57:03,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1358691330] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:03,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:03,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:57:03,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746971525] [2021-05-06 11:57:03,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:57:03,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:03,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:57:03,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1158, Invalid=3398, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:57:03,711 INFO L87 Difference]: Start difference. First operand 196 states and 200 transitions. Second operand has 65 states, 65 states have (on average 1.7076923076923076) internal successors, (111), 64 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:08,056 INFO L93 Difference]: Finished difference Result 303 states and 313 transitions. [2021-05-06 11:57:08,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:57:08,057 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.7076923076923076) internal successors, (111), 64 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-06 11:57:08,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:08,057 INFO L225 Difference]: With dead ends: 303 [2021-05-06 11:57:08,058 INFO L226 Difference]: Without dead ends: 199 [2021-05-06 11:57:08,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 4254.0ms TimeCoverageRelationStatistics Valid=3337, Invalid=13433, Unknown=0, NotChecked=0, Total=16770 [2021-05-06 11:57:08,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-06 11:57:08,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2021-05-06 11:57:08,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0257731958762886) internal successors, (199), 194 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 203 transitions. [2021-05-06 11:57:08,077 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 203 transitions. Word has length 115 [2021-05-06 11:57:08,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:08,077 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 203 transitions. [2021-05-06 11:57:08,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.7076923076923076) internal successors, (111), 64 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,078 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 203 transitions. [2021-05-06 11:57:08,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-06 11:57:08,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:08,078 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:08,078 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2021-05-06 11:57:08,078 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:08,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:08,079 INFO L82 PathProgramCache]: Analyzing trace with hash -126708687, now seen corresponding path program 36 times [2021-05-06 11:57:08,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:08,079 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495568751] [2021-05-06 11:57:08,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:08,085 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:08,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:08,099 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:08,107 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 11:57:08,110 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:08,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:08,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:08,140 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:08,155 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,156 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:08,163 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:08,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:08,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:08,193 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:08,208 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,211 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:08,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:08,224 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:08,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,232 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:08,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:08,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:08,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:08,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:08,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:08,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:09,840 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:09,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495568751] [2021-05-06 11:57:09,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1495568751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:09,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:09,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 11:57:09,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553686318] [2021-05-06 11:57:09,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 11:57:09,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:09,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 11:57:09,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1201, Invalid=3221, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:57:09,841 INFO L87 Difference]: Start difference. First operand 199 states and 203 transitions. Second operand has 67 states, 67 states have (on average 1.7014925373134329) internal successors, (114), 66 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:14,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:14,461 INFO L93 Difference]: Finished difference Result 315 states and 333 transitions. [2021-05-06 11:57:14,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:57:14,461 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.7014925373134329) internal successors, (114), 66 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 118 [2021-05-06 11:57:14,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:14,462 INFO L225 Difference]: With dead ends: 315 [2021-05-06 11:57:14,462 INFO L226 Difference]: Without dead ends: 210 [2021-05-06 11:57:14,464 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4526 ImplicationChecksByTransitivity, 4405.7ms TimeCoverageRelationStatistics Valid=3597, Invalid=13433, Unknown=0, NotChecked=0, Total=17030 [2021-05-06 11:57:14,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-05-06 11:57:14,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 124. [2021-05-06 11:57:14,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0336134453781514) internal successors, (123), 119 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:14,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2021-05-06 11:57:14,478 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 118 [2021-05-06 11:57:14,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:14,478 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2021-05-06 11:57:14,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 1.7014925373134329) internal successors, (114), 66 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:14,478 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2021-05-06 11:57:14,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 11:57:14,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:14,479 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:14,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-05-06 11:57:14,479 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:14,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:14,479 INFO L82 PathProgramCache]: Analyzing trace with hash -466471864, now seen corresponding path program 37 times [2021-05-06 11:57:14,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:14,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150903461] [2021-05-06 11:57:14,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:14,486 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:14,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:14,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:14,502 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:14,510 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:14,514 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:14,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:14,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:14,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:14,527 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:14,549 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:14,567 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:14,568 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:14,571 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:14,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:14,583 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:14,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:14,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:14,606 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:14,625 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:14,628 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:14,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:14,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:14,645 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:14,653 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 11:57:14,654 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:14,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:15,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:15,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:15,047 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:15,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:16,447 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:16,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150903461] [2021-05-06 11:57:16,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [150903461] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:16,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:16,447 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 11:57:16,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680981725] [2021-05-06 11:57:16,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 11:57:16,447 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:16,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 11:57:16,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1364, Invalid=3892, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:57:16,448 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand has 70 states, 70 states have (on average 1.7) internal successors, (119), 69 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:21,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:21,566 INFO L93 Difference]: Finished difference Result 333 states and 344 transitions. [2021-05-06 11:57:21,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 11:57:21,566 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.7) internal successors, (119), 69 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 123 [2021-05-06 11:57:21,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:21,567 INFO L225 Difference]: With dead ends: 333 [2021-05-06 11:57:21,567 INFO L226 Difference]: Without dead ends: 217 [2021-05-06 11:57:21,569 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5423 ImplicationChecksByTransitivity, 4932.0ms TimeCoverageRelationStatistics Valid=3940, Invalid=15520, Unknown=0, NotChecked=0, Total=19460 [2021-05-06 11:57:21,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-06 11:57:21,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2021-05-06 11:57:21,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.0235849056603774) internal successors, (217), 212 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:21,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 221 transitions. [2021-05-06 11:57:21,587 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 221 transitions. Word has length 123 [2021-05-06 11:57:21,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:21,588 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 221 transitions. [2021-05-06 11:57:21,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 1.7) internal successors, (119), 69 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:21,588 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 221 transitions. [2021-05-06 11:57:21,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-05-06 11:57:21,588 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:21,588 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:21,588 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 11:57:21,588 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:21,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:21,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1268153312, now seen corresponding path program 38 times [2021-05-06 11:57:21,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:21,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107029905] [2021-05-06 11:57:21,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:21,598 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:21,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:21,614 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:21,622 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:21,626 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:21,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:21,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:21,660 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:21,679 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:21,680 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:21,683 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:21,684 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:21,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:21,719 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:21,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:21,742 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:21,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:21,758 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:21,767 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:21,768 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:21,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:22,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:22,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:22,153 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 11:57:22,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:24,022 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:24,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107029905] [2021-05-06 11:57:24,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2107029905] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:24,022 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:24,022 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 11:57:24,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870681784] [2021-05-06 11:57:24,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 11:57:24,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:24,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 11:57:24,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=5138, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:57:24,023 INFO L87 Difference]: Start difference. First operand 217 states and 221 transitions. Second operand has 72 states, 72 states have (on average 1.6944444444444444) internal successors, (122), 71 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:29,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:29,420 INFO L93 Difference]: Finished difference Result 336 states and 345 transitions. [2021-05-06 11:57:29,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:57:29,420 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.6944444444444444) internal successors, (122), 71 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 126 [2021-05-06 11:57:29,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:29,421 INFO L225 Difference]: With dead ends: 336 [2021-05-06 11:57:29,421 INFO L226 Difference]: Without dead ends: 219 [2021-05-06 11:57:29,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2501 ImplicationChecksByTransitivity, 4825.5ms TimeCoverageRelationStatistics Valid=656, Invalid=14350, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 11:57:29,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-06 11:57:29,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2021-05-06 11:57:29,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 214 states have (on average 1.0233644859813085) internal successors, (219), 214 states have internal predecessors, (219), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:29,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 223 transitions. [2021-05-06 11:57:29,446 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 223 transitions. Word has length 126 [2021-05-06 11:57:29,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:29,446 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 223 transitions. [2021-05-06 11:57:29,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 1.6944444444444444) internal successors, (122), 71 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:29,446 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 223 transitions. [2021-05-06 11:57:29,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 11:57:29,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:29,447 INFO L523 BasicCegarLoop]: trace histogram [48, 47, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:29,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 11:57:29,447 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:29,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:29,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1835695387, now seen corresponding path program 39 times [2021-05-06 11:57:29,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:29,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52968164] [2021-05-06 11:57:29,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:29,456 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:29,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:29,470 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:29,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,480 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:29,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:29,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:29,514 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:29,529 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,530 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,532 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:29,542 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:29,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:29,574 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:29,590 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,592 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:29,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,596 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:29,605 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:29,613 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,613 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:29,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:29,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:30,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:30,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:31,630 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:31,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52968164] [2021-05-06 11:57:31,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [52968164] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:31,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:31,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 11:57:31,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116171870] [2021-05-06 11:57:31,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 11:57:31,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:31,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 11:57:31,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1479, Invalid=4221, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:57:31,632 INFO L87 Difference]: Start difference. First operand 219 states and 223 transitions. Second operand has 73 states, 73 states have (on average 1.6986301369863013) internal successors, (124), 72 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:36,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:36,953 INFO L93 Difference]: Finished difference Result 339 states and 349 transitions. [2021-05-06 11:57:36,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:57:36,953 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.6986301369863013) internal successors, (124), 72 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2021-05-06 11:57:36,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:36,954 INFO L225 Difference]: With dead ends: 339 [2021-05-06 11:57:36,954 INFO L226 Difference]: Without dead ends: 222 [2021-05-06 11:57:36,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5910 ImplicationChecksByTransitivity, 5268.0ms TimeCoverageRelationStatistics Valid=4283, Invalid=16887, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 11:57:36,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-06 11:57:36,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 222. [2021-05-06 11:57:36,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 217 states have (on average 1.023041474654378) internal successors, (222), 217 states have internal predecessors, (222), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:36,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 226 transitions. [2021-05-06 11:57:36,977 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 226 transitions. Word has length 128 [2021-05-06 11:57:36,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:36,977 INFO L480 AbstractCegarLoop]: Abstraction has 222 states and 226 transitions. [2021-05-06 11:57:36,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 1.6986301369863013) internal successors, (124), 72 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:36,977 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 226 transitions. [2021-05-06 11:57:36,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 11:57:36,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:36,977 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:36,978 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:57:36,978 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:36,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:36,978 INFO L82 PathProgramCache]: Analyzing trace with hash 603843641, now seen corresponding path program 40 times [2021-05-06 11:57:36,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:36,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664289066] [2021-05-06 11:57:36,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:36,984 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:36,989 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:36,993 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:36,997 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:37,005 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,008 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:37,017 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,019 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:37,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:37,047 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:37,062 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,065 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:37,069 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:37,070 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,079 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:37,081 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:37,108 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:37,124 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,126 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:37,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,131 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:37,140 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:37,147 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,148 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:37,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:37,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:37,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:37,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:37,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:39,710 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:39,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664289066] [2021-05-06 11:57:39,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [664289066] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:39,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:39,711 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 11:57:39,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156206113] [2021-05-06 11:57:39,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 11:57:39,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:39,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 11:57:39,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=5565, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:57:39,712 INFO L87 Difference]: Start difference. First operand 222 states and 226 transitions. Second operand has 75 states, 75 states have (on average 1.6933333333333334) internal successors, (127), 74 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:45,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:45,503 INFO L93 Difference]: Finished difference Result 342 states and 351 transitions. [2021-05-06 11:57:45,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:57:45,504 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.6933333333333334) internal successors, (127), 74 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 11:57:45,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:45,505 INFO L225 Difference]: With dead ends: 342 [2021-05-06 11:57:45,505 INFO L226 Difference]: Without dead ends: 224 [2021-05-06 11:57:45,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2706 ImplicationChecksByTransitivity, 5323.6ms TimeCoverageRelationStatistics Valid=695, Invalid=15561, Unknown=0, NotChecked=0, Total=16256 [2021-05-06 11:57:45,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-06 11:57:45,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2021-05-06 11:57:45,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 219 states have (on average 1.0228310502283104) internal successors, (224), 219 states have internal predecessors, (224), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:45,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 228 transitions. [2021-05-06 11:57:45,536 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 228 transitions. Word has length 131 [2021-05-06 11:57:45,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:45,538 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 228 transitions. [2021-05-06 11:57:45,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 1.6933333333333334) internal successors, (127), 74 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:45,538 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 228 transitions. [2021-05-06 11:57:45,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 11:57:45,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:45,539 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:45,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2021-05-06 11:57:45,539 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:45,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:45,540 INFO L82 PathProgramCache]: Analyzing trace with hash 667639956, now seen corresponding path program 41 times [2021-05-06 11:57:45,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:45,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914067345] [2021-05-06 11:57:45,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:45,546 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:45,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:45,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:45,562 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:45,570 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:45,574 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:45,583 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:45,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:45,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:45,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:45,604 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:45,620 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:45,621 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:45,623 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:45,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:45,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:45,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:45,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:45,653 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:45,668 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:45,671 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:45,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:45,675 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:45,684 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:45,692 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 11:57:45,692 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:45,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:46,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:46,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:46,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:46,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:46,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:47,795 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:47,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914067345] [2021-05-06 11:57:47,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1914067345] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:47,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:47,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:57:47,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847165556] [2021-05-06 11:57:47,795 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:57:47,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:47,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:57:47,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1552, Invalid=4148, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:57:47,796 INFO L87 Difference]: Start difference. First operand 224 states and 228 transitions. Second operand has 76 states, 76 states have (on average 1.6973684210526316) internal successors, (129), 75 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:53,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:53,531 INFO L93 Difference]: Finished difference Result 355 states and 375 transitions. [2021-05-06 11:57:53,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:57:53,532 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.6973684210526316) internal successors, (129), 75 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-06 11:57:53,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:53,533 INFO L225 Difference]: With dead ends: 355 [2021-05-06 11:57:53,533 INFO L226 Difference]: Without dead ends: 237 [2021-05-06 11:57:53,534 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5912 ImplicationChecksByTransitivity, 5600.3ms TimeCoverageRelationStatistics Valid=4650, Invalid=17402, Unknown=0, NotChecked=0, Total=22052 [2021-05-06 11:57:53,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-05-06 11:57:53,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 139. [2021-05-06 11:57:53,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0298507462686568) internal successors, (138), 134 states have internal predecessors, (138), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:53,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 142 transitions. [2021-05-06 11:57:53,550 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 142 transitions. Word has length 133 [2021-05-06 11:57:53,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:53,550 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 142 transitions. [2021-05-06 11:57:53,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 1.6973684210526316) internal successors, (129), 75 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:53,551 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 142 transitions. [2021-05-06 11:57:53,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-05-06 11:57:53,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:53,551 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:53,551 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2021-05-06 11:57:53,551 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:53,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:53,552 INFO L82 PathProgramCache]: Analyzing trace with hash 930769817, now seen corresponding path program 42 times [2021-05-06 11:57:53,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:53,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258847966] [2021-05-06 11:57:53,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:53,565 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:53,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:53,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:53,582 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:53,590 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:53,594 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:53,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:53,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:53,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:53,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:53,630 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:53,651 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:53,652 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:53,655 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:57:53,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:53,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:53,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:57:53,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:57:53,687 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:57:53,703 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:53,714 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:53,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:53,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:53,727 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:53,734 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:53,735 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:53,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:54,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:54,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:56,364 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:56,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258847966] [2021-05-06 11:57:56,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [258847966] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:56,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:56,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 11:57:56,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766415577] [2021-05-06 11:57:56,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 11:57:56,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:56,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 11:57:56,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=6168, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:57:56,365 INFO L87 Difference]: Start difference. First operand 139 states and 142 transitions. Second operand has 79 states, 79 states have (on average 1.6962025316455696) internal successors, (134), 78 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:02,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:02,789 INFO L93 Difference]: Finished difference Result 374 states and 384 transitions. [2021-05-06 11:58:02,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:58:02,789 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.6962025316455696) internal successors, (134), 78 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 138 [2021-05-06 11:58:02,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:02,794 INFO L225 Difference]: With dead ends: 374 [2021-05-06 11:58:02,794 INFO L226 Difference]: Without dead ends: 243 [2021-05-06 11:58:02,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3000 ImplicationChecksByTransitivity, 5690.1ms TimeCoverageRelationStatistics Valid=743, Invalid=17347, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 11:58:02,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-05-06 11:58:02,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-05-06 11:58:02,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 238 states have (on average 1.0210084033613445) internal successors, (243), 238 states have internal predecessors, (243), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:02,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 247 transitions. [2021-05-06 11:58:02,816 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 247 transitions. Word has length 138 [2021-05-06 11:58:02,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:02,816 INFO L480 AbstractCegarLoop]: Abstraction has 243 states and 247 transitions. [2021-05-06 11:58:02,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 1.6962025316455696) internal successors, (134), 78 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:02,816 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 247 transitions. [2021-05-06 11:58:02,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-05-06 11:58:02,817 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:02,817 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:02,817 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2021-05-06 11:58:02,817 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:02,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:02,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1200788770, now seen corresponding path program 43 times [2021-05-06 11:58:02,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:02,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139954427] [2021-05-06 11:58:02,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:02,823 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:02,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:02,838 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:02,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,849 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:02,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:02,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:02,880 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:02,896 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,896 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:02,899 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:02,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:02,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:02,929 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:02,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,946 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:02,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:02,960 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:02,967 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:02,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:03,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:03,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:03,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:03,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:05,789 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:05,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139954427] [2021-05-06 11:58:05,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [139954427] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:05,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:05,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 11:58:05,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375515041] [2021-05-06 11:58:05,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 11:58:05,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:05,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 11:58:05,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=6329, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:58:05,790 INFO L87 Difference]: Start difference. First operand 243 states and 247 transitions. Second operand has 80 states, 80 states have (on average 1.7) internal successors, (136), 79 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:12,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:12,393 INFO L93 Difference]: Finished difference Result 376 states and 385 transitions. [2021-05-06 11:58:12,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:58:12,393 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.7) internal successors, (136), 79 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2021-05-06 11:58:12,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:12,396 INFO L225 Difference]: With dead ends: 376 [2021-05-06 11:58:12,397 INFO L226 Difference]: Without dead ends: 245 [2021-05-06 11:58:12,398 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3082 ImplicationChecksByTransitivity, 5961.3ms TimeCoverageRelationStatistics Valid=751, Invalid=17881, Unknown=0, NotChecked=0, Total=18632 [2021-05-06 11:58:12,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-06 11:58:12,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 245. [2021-05-06 11:58:12,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 240 states have (on average 1.0208333333333333) internal successors, (245), 240 states have internal predecessors, (245), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:12,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 249 transitions. [2021-05-06 11:58:12,428 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 249 transitions. Word has length 140 [2021-05-06 11:58:12,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:12,428 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 249 transitions. [2021-05-06 11:58:12,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 80 states have (on average 1.7) internal successors, (136), 79 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:12,433 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 249 transitions. [2021-05-06 11:58:12,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-05-06 11:58:12,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:12,434 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:12,434 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 11:58:12,434 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:12,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:12,435 INFO L82 PathProgramCache]: Analyzing trace with hash -929190685, now seen corresponding path program 44 times [2021-05-06 11:58:12,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:12,435 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401151558] [2021-05-06 11:58:12,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:12,441 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:12,448 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:12,457 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:12,465 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,468 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:12,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:12,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:12,498 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:12,513 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,514 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:12,517 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:12,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:12,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:12,549 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:12,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,567 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:12,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:12,580 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:12,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,588 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:12,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:12,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:12,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:12,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:12,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:12,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:14,928 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:14,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401151558] [2021-05-06 11:58:14,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1401151558] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:14,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:14,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 11:58:14,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191505445] [2021-05-06 11:58:14,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 11:58:14,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:14,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 11:58:14,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1731, Invalid=4749, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:58:14,929 INFO L87 Difference]: Start difference. First operand 245 states and 249 transitions. Second operand has 81 states, 81 states have (on average 1.7037037037037037) internal successors, (138), 80 states have internal predecessors, (138), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:21,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:21,456 INFO L93 Difference]: Finished difference Result 385 states and 401 transitions. [2021-05-06 11:58:21,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 11:58:21,456 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.7037037037037037) internal successors, (138), 80 states have internal predecessors, (138), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 142 [2021-05-06 11:58:21,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:21,457 INFO L225 Difference]: With dead ends: 385 [2021-05-06 11:58:21,457 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 11:58:21,458 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6709 ImplicationChecksByTransitivity, 6300.4ms TimeCoverageRelationStatistics Valid=5187, Invalid=19935, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 11:58:21,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 11:58:21,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 148. [2021-05-06 11:58:21,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.027972027972028) internal successors, (147), 143 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:21,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 151 transitions. [2021-05-06 11:58:21,483 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 151 transitions. Word has length 142 [2021-05-06 11:58:21,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:21,483 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 151 transitions. [2021-05-06 11:58:21,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 1.7037037037037037) internal successors, (138), 80 states have internal predecessors, (138), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:21,483 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 151 transitions. [2021-05-06 11:58:21,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-06 11:58:21,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:21,484 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:21,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 11:58:21,484 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:21,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:21,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1664757718, now seen corresponding path program 45 times [2021-05-06 11:58:21,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:21,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589257227] [2021-05-06 11:58:21,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:21,491 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:21,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:21,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:21,506 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:21,515 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:21,519 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:21,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:21,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:21,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:21,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:21,554 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:21,573 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:21,575 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:21,578 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:21,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:21,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:21,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:21,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:21,615 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:21,635 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:21,638 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:21,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:21,643 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:21,654 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:21,663 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 11:58:21,664 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:21,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:22,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:22,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:22,121 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 11:58:22,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:24,095 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:24,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589257227] [2021-05-06 11:58:24,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1589257227] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:24,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:24,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 11:58:24,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822272665] [2021-05-06 11:58:24,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 11:58:24,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:24,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 11:58:24,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1920, Invalid=5562, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:58:24,097 INFO L87 Difference]: Start difference. First operand 148 states and 151 transitions. Second operand has 84 states, 84 states have (on average 1.7023809523809523) internal successors, (143), 83 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:30,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:30,978 INFO L93 Difference]: Finished difference Result 401 states and 412 transitions. [2021-05-06 11:58:30,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-06 11:58:30,978 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.7023809523809523) internal successors, (143), 83 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 147 [2021-05-06 11:58:30,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:30,979 INFO L225 Difference]: With dead ends: 401 [2021-05-06 11:58:30,979 INFO L226 Difference]: Without dead ends: 261 [2021-05-06 11:58:30,980 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7818 ImplicationChecksByTransitivity, 6560.6ms TimeCoverageRelationStatistics Valid=5586, Invalid=22470, Unknown=0, NotChecked=0, Total=28056 [2021-05-06 11:58:30,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-05-06 11:58:31,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2021-05-06 11:58:31,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 256 states have (on average 1.01953125) internal successors, (261), 256 states have internal predecessors, (261), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:31,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 265 transitions. [2021-05-06 11:58:31,012 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 265 transitions. Word has length 147 [2021-05-06 11:58:31,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:31,012 INFO L480 AbstractCegarLoop]: Abstraction has 261 states and 265 transitions. [2021-05-06 11:58:31,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 1.7023809523809523) internal successors, (143), 83 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:31,012 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 265 transitions. [2021-05-06 11:58:31,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-05-06 11:58:31,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:31,013 INFO L523 BasicCegarLoop]: trace histogram [57, 56, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:31,013 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2021-05-06 11:58:31,013 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:31,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:31,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1884191570, now seen corresponding path program 46 times [2021-05-06 11:58:31,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:31,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777652218] [2021-05-06 11:58:31,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:31,020 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:31,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,031 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:31,035 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:31,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:31,046 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:31,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,048 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,056 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:31,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:31,087 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:31,114 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:31,115 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:31,133 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:31,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:31,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:31,170 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:31,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:31,188 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:31,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:31,201 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:31,208 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 11:58:31,209 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:31,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:31,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:31,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:31,679 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 11:58:31,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:33,771 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:33,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777652218] [2021-05-06 11:58:33,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1777652218] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:33,772 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:33,772 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-06 11:58:33,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787190889] [2021-05-06 11:58:33,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-06 11:58:33,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:33,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-06 11:58:33,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2097, Invalid=5735, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:58:33,773 INFO L87 Difference]: Start difference. First operand 261 states and 265 transitions. Second operand has 86 states, 86 states have (on average 1.697674418604651) internal successors, (146), 85 states have internal predecessors, (146), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:41,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:41,176 INFO L93 Difference]: Finished difference Result 405 states and 415 transitions. [2021-05-06 11:58:41,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-06 11:58:41,177 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.697674418604651) internal successors, (146), 85 states have internal predecessors, (146), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 150 [2021-05-06 11:58:41,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:41,177 INFO L225 Difference]: With dead ends: 405 [2021-05-06 11:58:41,177 INFO L226 Difference]: Without dead ends: 264 [2021-05-06 11:58:41,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8247 ImplicationChecksByTransitivity, 6934.9ms TimeCoverageRelationStatistics Valid=6048, Invalid=23364, Unknown=0, NotChecked=0, Total=29412 [2021-05-06 11:58:41,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-06 11:58:41,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 264. [2021-05-06 11:58:41,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 259 states have (on average 1.0193050193050193) internal successors, (264), 259 states have internal predecessors, (264), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:41,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 268 transitions. [2021-05-06 11:58:41,210 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 268 transitions. Word has length 150 [2021-05-06 11:58:41,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:41,211 INFO L480 AbstractCegarLoop]: Abstraction has 264 states and 268 transitions. [2021-05-06 11:58:41,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 86 states have (on average 1.697674418604651) internal successors, (146), 85 states have internal predecessors, (146), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:41,211 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 268 transitions. [2021-05-06 11:58:41,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-06 11:58:41,212 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:41,212 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:41,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2021-05-06 11:58:41,212 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:41,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:41,212 INFO L82 PathProgramCache]: Analyzing trace with hash -2138445012, now seen corresponding path program 47 times [2021-05-06 11:58:41,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:41,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [389465371] [2021-05-06 11:58:41,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:41,219 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:41,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:41,234 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:41,242 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,246 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:41,247 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,257 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:41,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:41,279 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:41,297 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,298 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:41,302 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:41,303 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:41,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:41,336 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:41,353 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,356 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:41,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:41,370 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:41,378 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,378 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:41,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:41,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:41,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:41,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:41,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:44,550 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:44,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [389465371] [2021-05-06 11:58:44,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [389465371] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:44,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:44,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 11:58:44,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667088008] [2021-05-06 11:58:44,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 11:58:44,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:44,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 11:58:44,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=7620, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:58:44,552 INFO L87 Difference]: Start difference. First operand 264 states and 268 transitions. Second operand has 88 states, 88 states have (on average 1.6931818181818181) internal successors, (149), 87 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:51,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:51,513 INFO L93 Difference]: Finished difference Result 408 states and 417 transitions. [2021-05-06 11:58:51,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:58:51,513 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.6931818181818181) internal successors, (149), 87 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 153 [2021-05-06 11:58:51,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:51,514 INFO L225 Difference]: With dead ends: 408 [2021-05-06 11:58:51,514 INFO L226 Difference]: Without dead ends: 266 [2021-05-06 11:58:51,515 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3696 ImplicationChecksByTransitivity, 6865.3ms TimeCoverageRelationStatistics Valid=869, Invalid=21481, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 11:58:51,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-06 11:58:51,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 266. [2021-05-06 11:58:51,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 261 states have (on average 1.0191570881226053) internal successors, (266), 261 states have internal predecessors, (266), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:51,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 270 transitions. [2021-05-06 11:58:51,550 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 270 transitions. Word has length 153 [2021-05-06 11:58:51,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:51,550 INFO L480 AbstractCegarLoop]: Abstraction has 266 states and 270 transitions. [2021-05-06 11:58:51,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 88 states have (on average 1.6931818181818181) internal successors, (149), 87 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:51,551 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 270 transitions. [2021-05-06 11:58:51,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:58:51,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:51,551 INFO L523 BasicCegarLoop]: trace histogram [59, 58, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:51,551 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2021-05-06 11:58:51,551 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:51,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:51,552 INFO L82 PathProgramCache]: Analyzing trace with hash -710289081, now seen corresponding path program 48 times [2021-05-06 11:58:51,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:51,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441888939] [2021-05-06 11:58:51,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:51,558 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:51,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:51,573 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:51,581 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:51,584 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:51,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:51,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:51,627 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:51,642 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:51,643 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:51,646 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:58:51,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:58:51,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:58:51,689 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:58:51,709 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:51,711 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:51,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:51,726 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:51,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:51,734 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:51,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:52,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,314 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 11:58:52,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:54,496 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:54,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441888939] [2021-05-06 11:58:54,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1441888939] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:54,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:54,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-06 11:58:54,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948874290] [2021-05-06 11:58:54,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-06 11:58:54,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:54,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-06 11:58:54,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2178, Invalid=6194, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:58:54,498 INFO L87 Difference]: Start difference. First operand 266 states and 270 transitions. Second operand has 89 states, 89 states have (on average 1.696629213483146) internal successors, (151), 88 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:02,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:02,099 INFO L93 Difference]: Finished difference Result 411 states and 421 transitions. [2021-05-06 11:59:02,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:59:02,099 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.696629213483146) internal successors, (151), 88 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-06 11:59:02,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:02,100 INFO L225 Difference]: With dead ends: 411 [2021-05-06 11:59:02,100 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 11:59:02,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8839 ImplicationChecksByTransitivity, 7348.3ms TimeCoverageRelationStatistics Valid=6349, Invalid=25157, Unknown=0, NotChecked=0, Total=31506 [2021-05-06 11:59:02,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 11:59:02,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2021-05-06 11:59:02,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 264 states have (on average 1.018939393939394) internal successors, (269), 264 states have internal predecessors, (269), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:02,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 273 transitions. [2021-05-06 11:59:02,122 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 273 transitions. Word has length 155 [2021-05-06 11:59:02,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:02,122 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 273 transitions. [2021-05-06 11:59:02,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 89 states have (on average 1.696629213483146) internal successors, (151), 88 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:02,123 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 273 transitions. [2021-05-06 11:59:02,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-05-06 11:59:02,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:02,123 INFO L523 BasicCegarLoop]: trace histogram [60, 59, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:02,123 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 11:59:02,123 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:02,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:02,124 INFO L82 PathProgramCache]: Analyzing trace with hash -261281023, now seen corresponding path program 49 times [2021-05-06 11:59:02,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:02,124 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612806532] [2021-05-06 11:59:02,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:02,136 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:02,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:02,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:02,153 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:02,163 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:02,167 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:02,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:02,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:02,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:02,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:02,207 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:02,228 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:02,229 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:02,233 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:02,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:02,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:02,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:02,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:02,297 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:02,318 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:02,321 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:02,329 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:02,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:02,339 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:02,349 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:02,350 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:02,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:02,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:02,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:02,851 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:02,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:05,738 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:05,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612806532] [2021-05-06 11:59:05,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1612806532] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:05,738 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:05,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 11:59:05,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652438131] [2021-05-06 11:59:05,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 11:59:05,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:05,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 11:59:05,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=604, Invalid=8138, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:59:05,740 INFO L87 Difference]: Start difference. First operand 269 states and 273 transitions. Second operand has 91 states, 91 states have (on average 1.6923076923076923) internal successors, (154), 90 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:14,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:14,050 INFO L93 Difference]: Finished difference Result 414 states and 423 transitions. [2021-05-06 11:59:14,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 11:59:14,050 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.6923076923076923) internal successors, (154), 90 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 158 [2021-05-06 11:59:14,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:14,051 INFO L225 Difference]: With dead ends: 414 [2021-05-06 11:59:14,051 INFO L226 Difference]: Without dead ends: 271 [2021-05-06 11:59:14,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3944 ImplicationChecksByTransitivity, 7319.1ms TimeCoverageRelationStatistics Valid=913, Invalid=22957, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 11:59:14,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-05-06 11:59:14,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 271. [2021-05-06 11:59:14,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 266 states have (on average 1.018796992481203) internal successors, (271), 266 states have internal predecessors, (271), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:14,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 275 transitions. [2021-05-06 11:59:14,083 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 275 transitions. Word has length 158 [2021-05-06 11:59:14,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:14,083 INFO L480 AbstractCegarLoop]: Abstraction has 271 states and 275 transitions. [2021-05-06 11:59:14,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 91 states have (on average 1.6923076923076923) internal successors, (154), 90 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:14,083 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 275 transitions. [2021-05-06 11:59:14,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-05-06 11:59:14,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:14,084 INFO L523 BasicCegarLoop]: trace histogram [61, 60, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:14,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 11:59:14,084 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:14,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:14,085 INFO L82 PathProgramCache]: Analyzing trace with hash 1176819142, now seen corresponding path program 50 times [2021-05-06 11:59:14,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:14,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12791362] [2021-05-06 11:59:14,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:14,091 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:14,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:14,096 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:14,106 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:14,115 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:14,119 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:14,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:14,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:14,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:14,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:14,154 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:14,172 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:14,174 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:14,177 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:14,187 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:14,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:14,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:14,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:14,214 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:14,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:14,235 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:14,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:14,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:14,251 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:14,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:14,260 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:14,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:14,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:14,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:14,793 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:14,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:17,062 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:17,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12791362] [2021-05-06 11:59:17,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [12791362] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:17,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:17,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 11:59:17,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898078574] [2021-05-06 11:59:17,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 11:59:17,063 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:17,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 11:59:17,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2332, Invalid=6598, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:59:17,064 INFO L87 Difference]: Start difference. First operand 271 states and 275 transitions. Second operand has 92 states, 92 states have (on average 1.6956521739130435) internal successors, (156), 91 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:25,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:25,157 INFO L93 Difference]: Finished difference Result 417 states and 427 transitions. [2021-05-06 11:59:25,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 11:59:25,157 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.6956521739130435) internal successors, (156), 91 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 160 [2021-05-06 11:59:25,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:25,158 INFO L225 Difference]: With dead ends: 417 [2021-05-06 11:59:25,158 INFO L226 Difference]: Without dead ends: 274 [2021-05-06 11:59:25,159 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9462 ImplicationChecksByTransitivity, 7669.9ms TimeCoverageRelationStatistics Valid=6801, Invalid=26871, Unknown=0, NotChecked=0, Total=33672 [2021-05-06 11:59:25,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-05-06 11:59:25,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 274. [2021-05-06 11:59:25,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 269 states have (on average 1.0185873605947955) internal successors, (274), 269 states have internal predecessors, (274), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:25,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 278 transitions. [2021-05-06 11:59:25,183 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 278 transitions. Word has length 160 [2021-05-06 11:59:25,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:25,183 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 278 transitions. [2021-05-06 11:59:25,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 92 states have (on average 1.6956521739130435) internal successors, (156), 91 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:25,183 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 278 transitions. [2021-05-06 11:59:25,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 11:59:25,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:25,184 INFO L523 BasicCegarLoop]: trace histogram [62, 61, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:25,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2021-05-06 11:59:25,184 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:25,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:25,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1994536584, now seen corresponding path program 51 times [2021-05-06 11:59:25,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:25,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645591208] [2021-05-06 11:59:25,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:25,191 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:25,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:25,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:25,208 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:25,219 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:25,223 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:25,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:25,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:25,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:25,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:25,270 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:25,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:25,287 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:25,290 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:25,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:25,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:25,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:25,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:25,320 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:25,336 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:25,338 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:25,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:25,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:25,352 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:25,359 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:25,360 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:25,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:25,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:25,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:25,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:25,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:28,925 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:28,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645591208] [2021-05-06 11:59:28,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [645591208] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:28,925 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:28,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 11:59:28,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799189570] [2021-05-06 11:59:28,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 11:59:28,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:28,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 11:59:28,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=639, Invalid=8673, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:59:28,926 INFO L87 Difference]: Start difference. First operand 274 states and 278 transitions. Second operand has 94 states, 94 states have (on average 1.6914893617021276) internal successors, (159), 93 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:37,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:37,744 INFO L93 Difference]: Finished difference Result 420 states and 429 transitions. [2021-05-06 11:59:37,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:59:37,744 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.6914893617021276) internal successors, (159), 93 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 163 [2021-05-06 11:59:37,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:37,745 INFO L225 Difference]: With dead ends: 420 [2021-05-06 11:59:37,745 INFO L226 Difference]: Without dead ends: 276 [2021-05-06 11:59:37,746 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4200 ImplicationChecksByTransitivity, 7711.6ms TimeCoverageRelationStatistics Valid=958, Invalid=24482, Unknown=0, NotChecked=0, Total=25440 [2021-05-06 11:59:37,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-05-06 11:59:37,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 276. [2021-05-06 11:59:37,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 271 states have (on average 1.018450184501845) internal successors, (276), 271 states have internal predecessors, (276), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:37,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 280 transitions. [2021-05-06 11:59:37,776 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 280 transitions. Word has length 163 [2021-05-06 11:59:37,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:37,776 INFO L480 AbstractCegarLoop]: Abstraction has 276 states and 280 transitions. [2021-05-06 11:59:37,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 94 states have (on average 1.6914893617021276) internal successors, (159), 93 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:37,776 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 280 transitions. [2021-05-06 11:59:37,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-05-06 11:59:37,777 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:37,777 INFO L523 BasicCegarLoop]: trace histogram [63, 62, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:37,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 11:59:37,777 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:37,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:37,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1781853741, now seen corresponding path program 52 times [2021-05-06 11:59:37,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:37,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1514198574] [2021-05-06 11:59:37,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:37,788 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:37,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:37,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:37,802 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:37,809 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:37,812 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:37,813 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:37,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:37,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:37,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:37,845 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:37,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:37,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:37,879 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:37,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:37,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:37,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:37,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:37,917 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:37,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:37,943 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:37,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:37,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:37,961 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:37,971 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:37,972 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:37,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:38,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:38,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:38,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:38,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:40,907 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:40,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1514198574] [2021-05-06 11:59:40,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1514198574] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:40,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:40,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2021-05-06 11:59:40,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117787292] [2021-05-06 11:59:40,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-06 11:59:40,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:40,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-06 11:59:40,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2553, Invalid=6953, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:59:40,908 INFO L87 Difference]: Start difference. First operand 276 states and 280 transitions. Second operand has 95 states, 95 states have (on average 1.694736842105263) internal successors, (161), 94 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:49,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:49,728 INFO L93 Difference]: Finished difference Result 423 states and 433 transitions. [2021-05-06 11:59:49,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-06 11:59:49,728 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.694736842105263) internal successors, (161), 94 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 165 [2021-05-06 11:59:49,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:49,729 INFO L225 Difference]: With dead ends: 423 [2021-05-06 11:59:49,729 INFO L226 Difference]: Without dead ends: 279 [2021-05-06 11:59:49,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10110 ImplicationChecksByTransitivity, 8108.9ms TimeCoverageRelationStatistics Valid=7392, Invalid=28518, Unknown=0, NotChecked=0, Total=35910 [2021-05-06 11:59:49,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-05-06 11:59:49,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2021-05-06 11:59:49,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 274 states have (on average 1.0182481751824817) internal successors, (279), 274 states have internal predecessors, (279), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:49,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 283 transitions. [2021-05-06 11:59:49,759 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 283 transitions. Word has length 165 [2021-05-06 11:59:49,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:49,759 INFO L480 AbstractCegarLoop]: Abstraction has 279 states and 283 transitions. [2021-05-06 11:59:49,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 95 states have (on average 1.694736842105263) internal successors, (161), 94 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:49,759 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 283 transitions. [2021-05-06 11:59:49,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-05-06 11:59:49,760 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:49,760 INFO L523 BasicCegarLoop]: trace histogram [64, 63, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:49,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 11:59:49,760 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:49,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:49,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1590460853, now seen corresponding path program 53 times [2021-05-06 11:59:49,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:49,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553016678] [2021-05-06 11:59:49,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:49,767 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:49,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:49,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:49,781 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:49,788 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 11:59:49,791 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:49,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:49,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:49,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:49,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:49,821 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:49,837 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:49,838 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:49,840 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 11:59:49,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:49,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:49,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:59:49,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:59:49,868 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 11:59:49,884 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:49,886 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:49,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:49,895 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:49,899 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:49,907 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 11:59:49,907 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:49,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:50,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:50,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:50,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:50,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:50,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:53,733 WARN L205 SmtUtils]: Spent 3.31 s on a formula simplification. DAG size of input: 43 DAG size of output: 42 [2021-05-06 11:59:57,580 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:00:04,717 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:00:07,534 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:00:18,962 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:00:33,375 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:00:34,607 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:00:38,538 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:00:41,261 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:41,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553016678] [2021-05-06 12:00:41,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1553016678] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:41,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:41,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2021-05-06 12:00:41,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592175812] [2021-05-06 12:00:41,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-06 12:00:41,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:41,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-06 12:00:41,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2546, Invalid=6766, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 12:00:41,263 INFO L87 Difference]: Start difference. First operand 279 states and 283 transitions. Second operand has 97 states, 97 states have (on average 1.690721649484536) internal successors, (164), 96 states have internal predecessors, (164), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:42,888 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:00:45,608 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:00:47,679 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:00:49,733 WARN L205 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:00:51,779 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:00:53,794 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:00:55,859 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:00:57,986 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:00,123 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:02,181 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:04,231 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:06,298 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:08,420 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:10,450 WARN L205 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:12,455 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:14,421 WARN L205 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:16,477 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:18,614 WARN L205 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:20,732 WARN L205 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:22,847 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:24,887 WARN L205 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:26,972 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:29,043 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:31,096 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:33,028 WARN L205 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:35,096 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:37,174 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:39,236 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:41,297 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:43,261 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:45,335 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:47,422 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:49,575 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:51,631 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:53,591 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:55,632 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:57,651 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:01:59,727 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:01,669 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:03,634 WARN L205 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:05,633 WARN L205 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:07,673 WARN L205 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:09,749 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:11,720 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:13,655 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:15,628 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:17,613 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:19,687 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:21,676 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:23,590 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:25,558 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:27,537 WARN L205 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:29,552 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:31,511 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:33,405 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:35,356 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:37,338 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:39,360 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:41,341 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:43,226 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:45,145 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:47,117 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:49,257 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:51,248 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:02:53,261 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:02:53,562 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:53,901 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:54,216 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:54,545 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:54,893 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:55,242 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:55,606 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:55,977 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:56,357 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:56,767 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:57,161 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:57,568 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:57,999 WARN L205 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:58,429 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:58,876 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:59,326 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:02:59,792 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:00,270 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:00,749 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:01,233 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:01,706 WARN L205 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:02,188 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:02,682 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:03,177 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:03,714 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:04,238 WARN L205 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:04,785 WARN L205 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:05,342 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:05,917 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:03:06,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:06,613 INFO L93 Difference]: Finished difference Result 445 states and 473 transitions. [2021-05-06 12:03:06,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 12:03:06,614 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.690721649484536) internal successors, (164), 96 states have internal predecessors, (164), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 168 [2021-05-06 12:03:06,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:06,614 INFO L225 Difference]: With dead ends: 445 [2021-05-06 12:03:06,615 INFO L226 Difference]: Without dead ends: 300 [2021-05-06 12:03:06,616 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9951 ImplicationChecksByTransitivity, 116889.2ms TimeCoverageRelationStatistics Valid=7632, Invalid=28658, Unknown=0, NotChecked=0, Total=36290 [2021-05-06 12:03:06,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-05-06 12:03:06,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 174. [2021-05-06 12:03:06,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.0236686390532543) internal successors, (173), 169 states have internal predecessors, (173), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:06,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 177 transitions. [2021-05-06 12:03:06,631 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 177 transitions. Word has length 168 [2021-05-06 12:03:06,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:06,631 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 177 transitions. [2021-05-06 12:03:06,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 97 states have (on average 1.690721649484536) internal successors, (164), 96 states have internal predecessors, (164), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:06,631 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 177 transitions. [2021-05-06 12:03:06,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 12:03:06,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:06,632 INFO L523 BasicCegarLoop]: trace histogram [66, 65, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:06,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2021-05-06 12:03:06,632 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:06,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:06,632 INFO L82 PathProgramCache]: Analyzing trace with hash 629738948, now seen corresponding path program 54 times [2021-05-06 12:03:06,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:06,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828181827] [2021-05-06 12:03:06,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:06,699 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:06,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:06,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:06,852 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:06,998 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-06 12:03:06,999 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 12:03:07,019 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 12:03:07,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:07,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:07,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:03:07,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 12:03:07,274 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 12:03:07,526 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-06 12:03:07,526 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:07,527 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:07,538 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 12:03:07,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:07,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:07,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:03:07,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 12:03:07,791 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 12:03:08,034 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-06 12:03:08,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:08,036 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:08,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:08,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:08,181 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:08,332 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-06 12:03:08,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:08,333 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:08,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:08,730 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2021-05-06 12:03:16,149 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2021-05-06 12:03:16,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:16,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:16,153 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 12:03:16,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:16,497 WARN L205 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 14 [2021-05-06 12:03:16,689 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-06 12:03:16,925 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-06 12:03:17,933 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:03:35,605 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:03:47,960 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:03:51,310 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-06 12:04:04,439 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:04,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828181827] [2021-05-06 12:04:04,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1828181827] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:04,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:04,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2021-05-06 12:04:04,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153367531] [2021-05-06 12:04:04,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 100 states [2021-05-06 12:04:04,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:04,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-05-06 12:04:04,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2848, Invalid=7658, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 12:04:04,441 INFO L87 Difference]: Start difference. First operand 174 states and 177 transitions. Second operand has 100 states, 100 states have (on average 1.69) internal successors, (169), 99 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:06,234 WARN L205 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:04:08,364 WARN L205 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:04:10,989 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:12,944 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:14,912 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:16,961 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:19,007 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:21,087 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:23,094 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:25,078 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:27,131 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:29,181 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:31,179 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:33,122 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:35,275 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:37,315 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:39,391 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:41,478 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:43,459 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:45,490 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:47,529 WARN L205 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:49,629 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:51,687 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:53,626 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:55,616 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:57,660 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:04:59,721 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:01,755 WARN L205 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:03,914 WARN L205 SmtUtils]: Spent 331.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:06,041 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:08,228 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:10,310 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:12,272 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:14,265 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:16,255 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:18,329 WARN L205 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:20,465 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:22,487 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:24,513 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:26,597 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:28,703 WARN L205 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:30,788 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:32,783 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:34,818 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:36,837 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:38,950 WARN L205 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:41,032 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:42,996 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:44,990 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:47,034 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:49,311 WARN L205 SmtUtils]: Spent 338.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:51,375 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:53,384 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:55,430 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:57,418 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:05:59,397 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:01,363 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:03,306 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:05,330 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:07,406 WARN L205 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:09,460 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:11,533 WARN L205 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:13,489 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:15,483 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:17,562 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:19,809 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:21,792 WARN L205 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:06:23,190 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:24,054 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:24,373 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:24,709 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:25,056 WARN L205 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:25,413 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:25,797 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:26,194 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:26,586 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:26,987 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:27,427 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:27,843 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:28,275 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:28,718 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:29,170 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:29,623 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:30,087 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:30,545 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:31,017 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:31,537 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:32,019 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:32,506 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:33,011 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:33,551 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:34,086 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:34,653 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:35,218 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:35,809 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:36,381 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:36,973 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:06:38,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:38,041 INFO L93 Difference]: Finished difference Result 473 states and 484 transitions. [2021-05-06 12:06:38,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-06 12:06:38,042 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.69) internal successors, (169), 99 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 173 [2021-05-06 12:06:38,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:38,042 INFO L225 Difference]: With dead ends: 473 [2021-05-06 12:06:38,042 INFO L226 Difference]: Without dead ends: 307 [2021-05-06 12:06:38,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11264 ImplicationChecksByTransitivity, 128039.5ms TimeCoverageRelationStatistics Valid=8263, Invalid=31537, Unknown=0, NotChecked=0, Total=39800 [2021-05-06 12:06:38,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2021-05-06 12:06:38,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2021-05-06 12:06:38,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 302 states have (on average 1.0165562913907285) internal successors, (307), 302 states have internal predecessors, (307), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:38,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 311 transitions. [2021-05-06 12:06:38,076 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 311 transitions. Word has length 173 [2021-05-06 12:06:38,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:38,076 INFO L480 AbstractCegarLoop]: Abstraction has 307 states and 311 transitions. [2021-05-06 12:06:38,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 100 states, 100 states have (on average 1.69) internal successors, (169), 99 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:38,077 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 311 transitions. [2021-05-06 12:06:38,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-06 12:06:38,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:38,077 INFO L523 BasicCegarLoop]: trace histogram [67, 66, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:38,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 12:06:38,077 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:38,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:38,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1972530916, now seen corresponding path program 55 times [2021-05-06 12:06:38,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:38,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1728378193] [2021-05-06 12:06:38,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:38,141 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:38,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,261 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:38,299 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:38,435 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-06 12:06:38,435 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 12:06:38,454 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 12:06:38,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:06:38,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 12:06:38,690 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 12:06:38,912 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:06:38,913 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,913 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:38,924 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size [2021-05-06 12:06:39,009 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:39,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:39,063 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:06:39,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 12:06:39,181 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.4 percent of original size 68 [2021-05-06 12:06:39,420 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-06 12:06:39,420 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:39,422 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:39,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:39,534 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:39,573 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:39,720 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-06 12:06:39,721 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:39,721 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:39,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,403 WARN L205 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2021-05-06 12:06:46,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:46,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:46,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:46,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:46,516 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 41 [2021-05-06 12:07:33,110 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:33,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1728378193] [2021-05-06 12:07:33,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1728378193] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:33,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:33,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2021-05-06 12:07:33,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548473913] [2021-05-06 12:07:33,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2021-05-06 12:07:33,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:33,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-05-06 12:07:33,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2841, Invalid=7461, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 12:07:33,112 INFO L87 Difference]: Start difference. First operand 307 states and 311 transitions. Second operand has 102 states, 102 states have (on average 1.6862745098039216) internal successors, (172), 101 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:34,939 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:07:37,526 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:39,514 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:41,474 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:43,432 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:45,409 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:47,522 WARN L205 SmtUtils]: Spent 307.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:49,504 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:51,449 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:53,381 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:55,368 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:57,339 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:07:59,308 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:01,252 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:03,162 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:05,147 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:07,111 WARN L205 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:09,126 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:11,106 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:13,003 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:14,912 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:16,849 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:18,797 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:20,756 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:22,692 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:24,585 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:26,519 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:28,447 WARN L205 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:30,376 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:32,299 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:34,396 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:36,365 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:38,317 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:40,266 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:42,149 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:08:44,082 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 41