/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/insertion_sort-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:09:03,086 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:09:03,087 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:09:03,110 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:09:03,138 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:09:03,140 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:09:03,141 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:09:03,142 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:09:03,144 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:09:03,145 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:09:03,147 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:09:03,150 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:09:03,151 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:09:03,152 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:09:03,153 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:09:03,153 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:09:03,155 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 11:09:03,159 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:09:03,160 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:09:03,161 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:09:03,161 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 11:09:03,169 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:09:03,169 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:09:03,170 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:09:03,170 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:09:03,170 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:09:03,170 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:09:03,170 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:09:03,170 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:09:03,170 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:09:03,171 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:09:03,171 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:09:03,171 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:09:03,171 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:09:03,171 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:09:03,171 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:09:03,171 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:09:03,171 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:09:03,172 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:09:03,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:09:03,172 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:09:03,172 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:09:03,172 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:09:03,172 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:09:03,172 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:09:03,392 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:09:03,406 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:09:03,408 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:09:03,408 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:09:03,409 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:09:03,409 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/insertion_sort-1.c [2021-05-06 11:09:03,447 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c14f0e3a/0fc7f35b6308449eae3a9de06f297031/FLAGa6563abbb [2021-05-06 11:09:03,825 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:09:03,826 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/insertion_sort-1.c [2021-05-06 11:09:03,830 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c14f0e3a/0fc7f35b6308449eae3a9de06f297031/FLAGa6563abbb [2021-05-06 11:09:03,847 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c14f0e3a/0fc7f35b6308449eae3a9de06f297031 [2021-05-06 11:09:03,849 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:09:03,851 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:09:03,852 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:03,853 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:09:03,855 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:09:03,856 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:03" (1/1) ... [2021-05-06 11:09:03,857 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f896032 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:03, skipping insertion in model container [2021-05-06 11:09:03,857 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:03" (1/1) ... [2021-05-06 11:09:03,862 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:09:03,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:09:03,971 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/insertion_sort-1.c[328,341] [2021-05-06 11:09:03,982 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:03,988 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:09:04,000 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/insertion_sort-1.c[328,341] [2021-05-06 11:09:04,018 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:04,028 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:09:04,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04 WrapperNode [2021-05-06 11:09:04,029 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:04,030 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:09:04,030 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:09:04,030 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:09:04,069 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,069 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,088 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,088 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,099 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,103 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,104 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,105 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:09:04,105 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:09:04,106 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:09:04,106 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:09:04,106 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (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 11:09:04,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:09:04,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:09:04,170 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:09:04,170 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:09:04,170 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:09:04,171 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:09:04,171 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:09:04,171 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:09:04,171 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:09:04,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:09:04,172 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-06 11:09:04,172 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 11:09:04,172 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:09:04,172 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:09:04,172 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:09:04,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:09:04,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:09:04,173 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:09:04,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:09:04,479 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:09:04,479 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-05-06 11:09:04,480 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:04 BoogieIcfgContainer [2021-05-06 11:09:04,480 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:09:04,481 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:09:04,482 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:09:04,483 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:09:04,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:09:03" (1/3) ... [2021-05-06 11:09:04,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aa481d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:04, skipping insertion in model container [2021-05-06 11:09:04,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (2/3) ... [2021-05-06 11:09:04,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aa481d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:04, skipping insertion in model container [2021-05-06 11:09:04,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:04" (3/3) ... [2021-05-06 11:09:04,486 INFO L111 eAbstractionObserver]: Analyzing ICFG insertion_sort-1.c [2021-05-06 11:09:04,490 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:09:04,493 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:09:04,505 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:09:04,519 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:09:04,519 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:09:04,519 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:09:04,519 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:09:04,519 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:09:04,519 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:09:04,520 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:09:04,520 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:09:04,529 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 25 states have (on average 1.48) internal successors, (37), 26 states have internal predecessors, (37), 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 11:09:04,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:09:04,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:04,539 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:04,540 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:04,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:04,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1898607287, now seen corresponding path program 1 times [2021-05-06 11:09:04,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:04,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104608914] [2021-05-06 11:09:04,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:04,601 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:04,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:04,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:04,849 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:04,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104608914] [2021-05-06 11:09:04,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [104608914] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:04,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:04,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:04,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407970587] [2021-05-06 11:09:04,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:04,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:04,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:04,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:04,863 INFO L87 Difference]: Start difference. First operand has 33 states, 25 states have (on average 1.48) internal successors, (37), 26 states have internal predecessors, (37), 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 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 11:09:04,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:04,999 INFO L93 Difference]: Finished difference Result 67 states and 92 transitions. [2021-05-06 11:09:04,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:05,000 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 15 [2021-05-06 11:09:05,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,004 INFO L225 Difference]: With dead ends: 67 [2021-05-06 11:09:05,005 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:09:05,007 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:05,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:09:05,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-06 11:09:05,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:05,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-05-06 11:09:05,031 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 15 [2021-05-06 11:09:05,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,032 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-05-06 11:09:05,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 11:09:05,032 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-05-06 11:09:05,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:09:05,032 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,033 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:09:05,033 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1409532089, now seen corresponding path program 1 times [2021-05-06 11:09:05,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859234366] [2021-05-06 11:09:05,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,047 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,047 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,049 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:05,313 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859234366] [2021-05-06 11:09:05,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1859234366] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:05,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842262011] [2021-05-06 11:09:05,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:05,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:05,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:05,316 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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 11:09:05,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,481 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2021-05-06 11:09:05,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:05,482 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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 17 [2021-05-06 11:09:05,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,483 INFO L225 Difference]: With dead ends: 55 [2021-05-06 11:09:05,483 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 11:09:05,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 181.5ms TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:05,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 11:09:05,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-06 11:09:05,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:05,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-05-06 11:09:05,500 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 17 [2021-05-06 11:09:05,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,501 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-05-06 11:09:05,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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 11:09:05,501 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-05-06 11:09:05,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:09:05,503 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,503 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,503 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:09:05,503 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,503 INFO L82 PathProgramCache]: Analyzing trace with hash 440297925, now seen corresponding path program 2 times [2021-05-06 11:09:05,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,504 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449209119] [2021-05-06 11:09:05,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,514 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,517 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:05,703 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449209119] [2021-05-06 11:09:05,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1449209119] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,704 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:05,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265019067] [2021-05-06 11:09:05,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:05,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:05,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:05,705 INFO L87 Difference]: Start difference. First operand 31 states and 36 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 11:09:05,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,866 INFO L93 Difference]: Finished difference Result 64 states and 78 transitions. [2021-05-06 11:09:05,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:05,867 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 11:09:05,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,869 INFO L225 Difference]: With dead ends: 64 [2021-05-06 11:09:05,869 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 11:09:05,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 128.7ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:05,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 11:09:05,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 32. [2021-05-06 11:09:05,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:05,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-05-06 11:09:05,887 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 19 [2021-05-06 11:09:05,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,887 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-05-06 11:09:05,887 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 11:09:05,887 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-05-06 11:09:05,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:09:05,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,888 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,888 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:09:05,888 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,889 INFO L82 PathProgramCache]: Analyzing trace with hash -1068097608, now seen corresponding path program 1 times [2021-05-06 11:09:05,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1803129640] [2021-05-06 11:09:05,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,894 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,894 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,896 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:06,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:06,263 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:06,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1803129640] [2021-05-06 11:09:06,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1803129640] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:06,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:06,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:09:06,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091465479] [2021-05-06 11:09:06,264 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:09:06,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:06,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:09:06,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:06,265 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 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 11:09:06,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:06,741 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2021-05-06 11:09:06,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:09:06,742 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 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 25 [2021-05-06 11:09:06,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:06,743 INFO L225 Difference]: With dead ends: 86 [2021-05-06 11:09:06,743 INFO L226 Difference]: Without dead ends: 67 [2021-05-06 11:09:06,743 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 426.5ms TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:09:06,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-06 11:09:06,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 48. [2021-05-06 11:09:06,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 40 states have (on average 1.25) internal successors, (50), 41 states have internal predecessors, (50), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:06,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2021-05-06 11:09:06,752 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 25 [2021-05-06 11:09:06,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:06,752 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2021-05-06 11:09:06,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 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 11:09:06,752 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2021-05-06 11:09:06,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:09:06,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:06,753 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:06,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:09:06,753 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:06,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:06,753 INFO L82 PathProgramCache]: Analyzing trace with hash -367033030, now seen corresponding path program 1 times [2021-05-06 11:09:06,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:06,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081650268] [2021-05-06 11:09:06,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:06,757 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:06,757 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:06,758 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:06,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:06,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:06,804 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:06,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081650268] [2021-05-06 11:09:06,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2081650268] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:06,804 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:06,804 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:06,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708736735] [2021-05-06 11:09:06,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:06,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:06,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:06,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:06,805 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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 11:09:06,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:06,893 INFO L93 Difference]: Finished difference Result 100 states and 122 transitions. [2021-05-06 11:09:06,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:06,893 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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 25 [2021-05-06 11:09:06,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:06,895 INFO L225 Difference]: With dead ends: 100 [2021-05-06 11:09:06,895 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 11:09:06,895 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 28.3ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:06,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 11:09:06,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 50. [2021-05-06 11:09:06,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 43 states have internal predecessors, (52), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:06,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2021-05-06 11:09:06,903 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 25 [2021-05-06 11:09:06,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:06,903 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2021-05-06 11:09:06,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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 11:09:06,903 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2021-05-06 11:09:06,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 11:09:06,904 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:06,904 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:06,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:09:06,904 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:06,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:06,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1586594931, now seen corresponding path program 1 times [2021-05-06 11:09:06,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:06,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168180254] [2021-05-06 11:09:06,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:06,908 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:06,909 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:06,909 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:06,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:07,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:07,269 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:07,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168180254] [2021-05-06 11:09:07,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [168180254] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:07,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:07,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:09:07,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595476004] [2021-05-06 11:09:07,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:09:07,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:07,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:09:07,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:09:07,270 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 19 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 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 11:09:07,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:07,939 INFO L93 Difference]: Finished difference Result 138 states and 171 transitions. [2021-05-06 11:09:07,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:09:07,939 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 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 30 [2021-05-06 11:09:07,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:07,941 INFO L225 Difference]: With dead ends: 138 [2021-05-06 11:09:07,941 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 11:09:07,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 566.5ms TimeCoverageRelationStatistics Valid=232, Invalid=1174, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:09:07,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 11:09:07,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 55. [2021-05-06 11:09:07,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 47 states have (on average 1.2127659574468086) internal successors, (57), 48 states have internal predecessors, (57), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:07,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-05-06 11:09:07,952 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 30 [2021-05-06 11:09:07,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:07,952 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-05-06 11:09:07,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 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 11:09:07,952 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-05-06 11:09:07,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:09:07,952 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:07,953 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:07,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:09:07,953 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:07,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:07,953 INFO L82 PathProgramCache]: Analyzing trace with hash 932991851, now seen corresponding path program 2 times [2021-05-06 11:09:07,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:07,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406866233] [2021-05-06 11:09:07,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:07,957 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:07,957 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:07,958 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:07,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:08,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:08,054 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:08,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406866233] [2021-05-06 11:09:08,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [406866233] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:08,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:08,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:08,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465292757] [2021-05-06 11:09:08,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:08,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:08,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:08,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:08,059 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 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 11:09:08,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:08,206 INFO L93 Difference]: Finished difference Result 147 states and 177 transitions. [2021-05-06 11:09:08,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:08,207 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 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 31 [2021-05-06 11:09:08,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:08,208 INFO L225 Difference]: With dead ends: 147 [2021-05-06 11:09:08,208 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 11:09:08,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 72.0ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:08,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 11:09:08,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2021-05-06 11:09:08,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 63 states have internal predecessors, (74), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:08,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 81 transitions. [2021-05-06 11:09:08,234 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 81 transitions. Word has length 31 [2021-05-06 11:09:08,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:08,235 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 81 transitions. [2021-05-06 11:09:08,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 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 11:09:08,235 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 81 transitions. [2021-05-06 11:09:08,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:09:08,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:08,239 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:08,239 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:09:08,239 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:08,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:08,240 INFO L82 PathProgramCache]: Analyzing trace with hash 912710034, now seen corresponding path program 1 times [2021-05-06 11:09:08,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:08,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212085242] [2021-05-06 11:09:08,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:08,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:08,250 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:08,252 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:08,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:08,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-06 11:09:08,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:08,366 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:08,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212085242] [2021-05-06 11:09:08,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1212085242] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:08,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:08,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:08,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649295990] [2021-05-06 11:09:08,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:08,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:08,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:08,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:08,367 INFO L87 Difference]: Start difference. First operand 70 states and 81 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:08,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:08,515 INFO L93 Difference]: Finished difference Result 116 states and 136 transitions. [2021-05-06 11:09:08,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:09:08,515 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2021-05-06 11:09:08,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:08,516 INFO L225 Difference]: With dead ends: 116 [2021-05-06 11:09:08,516 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:09:08,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 97.2ms TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:08,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:09:08,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 66. [2021-05-06 11:09:08,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 59 states have internal predecessors, (69), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:08,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2021-05-06 11:09:08,526 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 33 [2021-05-06 11:09:08,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:08,526 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2021-05-06 11:09:08,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:08,527 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2021-05-06 11:09:08,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:09:08,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:08,527 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:08,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:09:08,527 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:08,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:08,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1010087575, now seen corresponding path program 3 times [2021-05-06 11:09:08,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:08,528 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [362049459] [2021-05-06 11:09:08,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:08,532 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:08,533 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:08,533 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:08,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:08,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:08,837 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:08,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [362049459] [2021-05-06 11:09:08,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [362049459] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:08,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:08,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:09:08,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907227827] [2021-05-06 11:09:08,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:09:08,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:08,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:09:08,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:08,838 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 18 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 11:09:09,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:09,264 INFO L93 Difference]: Finished difference Result 103 states and 123 transitions. [2021-05-06 11:09:09,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:09:09,265 INFO L78 Accepts]: Start accepts. Automaton has has 18 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 11:09:09,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:09,266 INFO L225 Difference]: With dead ends: 103 [2021-05-06 11:09:09,266 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 11:09:09,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 375.5ms TimeCoverageRelationStatistics Valid=115, Invalid=535, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:09,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 11:09:09,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 76. [2021-05-06 11:09:09,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 68 states have (on average 1.2205882352941178) internal successors, (83), 69 states have internal predecessors, (83), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:09,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 90 transitions. [2021-05-06 11:09:09,278 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 90 transitions. Word has length 33 [2021-05-06 11:09:09,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:09,278 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 90 transitions. [2021-05-06 11:09:09,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 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 11:09:09,278 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 90 transitions. [2021-05-06 11:09:09,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:09:09,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:09,279 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:09,279 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:09:09,279 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:09,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:09,279 INFO L82 PathProgramCache]: Analyzing trace with hash 925785056, now seen corresponding path program 1 times [2021-05-06 11:09:09,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:09,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739488729] [2021-05-06 11:09:09,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:09,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:09,284 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:09,285 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:09,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:09,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:09,523 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:09,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739488729] [2021-05-06 11:09:09,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [739488729] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:09,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:09,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:09,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220298581] [2021-05-06 11:09:09,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:09,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:09,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:09,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:09,524 INFO L87 Difference]: Start difference. First operand 76 states and 90 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 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 11:09:10,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:10,337 INFO L93 Difference]: Finished difference Result 219 states and 274 transitions. [2021-05-06 11:09:10,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:09:10,338 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 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 11:09:10,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:10,340 INFO L225 Difference]: With dead ends: 219 [2021-05-06 11:09:10,340 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 11:09:10,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 625.2ms TimeCoverageRelationStatistics Valid=358, Invalid=1364, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:09:10,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 11:09:10,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 87. [2021-05-06 11:09:10,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 79 states have (on average 1.2658227848101267) internal successors, (100), 80 states have internal predecessors, (100), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:10,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 107 transitions. [2021-05-06 11:09:10,363 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 107 transitions. Word has length 38 [2021-05-06 11:09:10,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:10,363 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 107 transitions. [2021-05-06 11:09:10,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 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 11:09:10,363 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 107 transitions. [2021-05-06 11:09:10,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:09:10,364 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:10,364 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:10,364 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:09:10,364 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:10,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:10,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1626849634, now seen corresponding path program 2 times [2021-05-06 11:09:10,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:10,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [487704560] [2021-05-06 11:09:10,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:10,370 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:10,370 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:10,371 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:10,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:10,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:10,435 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:10,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [487704560] [2021-05-06 11:09:10,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [487704560] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:10,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:10,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:10,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199007884] [2021-05-06 11:09:10,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:10,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:10,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:10,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:10,436 INFO L87 Difference]: Start difference. First operand 87 states and 107 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 11:09:10,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:10,602 INFO L93 Difference]: Finished difference Result 174 states and 219 transitions. [2021-05-06 11:09:10,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:10,603 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 11:09:10,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:10,603 INFO L225 Difference]: With dead ends: 174 [2021-05-06 11:09:10,604 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 11:09:10,604 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 59.8ms TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:09:10,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 11:09:10,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 94. [2021-05-06 11:09:10,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 86 states have (on average 1.2093023255813953) internal successors, (104), 87 states have internal predecessors, (104), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:10,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 111 transitions. [2021-05-06 11:09:10,617 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 111 transitions. Word has length 38 [2021-05-06 11:09:10,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:10,617 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 111 transitions. [2021-05-06 11:09:10,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 11:09:10,617 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 111 transitions. [2021-05-06 11:09:10,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:09:10,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:10,618 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:10,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:09:10,618 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:10,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:10,618 INFO L82 PathProgramCache]: Analyzing trace with hash 909842600, now seen corresponding path program 3 times [2021-05-06 11:09:10,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:10,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126931934] [2021-05-06 11:09:10,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:10,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:10,623 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:10,623 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:10,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:10,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:10,982 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:10,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126931934] [2021-05-06 11:09:10,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1126931934] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:10,982 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:10,982 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:10,982 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012561918] [2021-05-06 11:09:10,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:10,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:10,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:10,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:10,983 INFO L87 Difference]: Start difference. First operand 94 states and 111 transitions. Second operand has 22 states, 21 states have (on average 1.619047619047619) internal successors, (34), 20 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 11:09:11,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:11,458 INFO L93 Difference]: Finished difference Result 129 states and 153 transitions. [2021-05-06 11:09:11,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:09:11,459 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.619047619047619) internal successors, (34), 20 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 11:09:11,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:11,459 INFO L225 Difference]: With dead ends: 129 [2021-05-06 11:09:11,459 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 11:09:11,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 457.0ms TimeCoverageRelationStatistics Valid=151, Invalid=841, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:09:11,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 11:09:11,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 94. [2021-05-06 11:09:11,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 86 states have (on average 1.2093023255813953) internal successors, (104), 87 states have internal predecessors, (104), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:11,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 111 transitions. [2021-05-06 11:09:11,474 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 111 transitions. Word has length 38 [2021-05-06 11:09:11,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:11,474 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 111 transitions. [2021-05-06 11:09:11,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.619047619047619) internal successors, (34), 20 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 11:09:11,474 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 111 transitions. [2021-05-06 11:09:11,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:09:11,474 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:11,474 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:11,474 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:09:11,475 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:11,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:11,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1844691523, now seen corresponding path program 2 times [2021-05-06 11:09:11,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:11,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [30145837] [2021-05-06 11:09:11,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:11,481 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:11,481 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:11,483 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:11,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:11,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-06 11:09:11,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:11,662 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:11,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [30145837] [2021-05-06 11:09:11,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [30145837] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:11,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:11,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:09:11,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864008867] [2021-05-06 11:09:11,662 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:09:11,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:11,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:09:11,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:11,663 INFO L87 Difference]: Start difference. First operand 94 states and 111 transitions. Second operand has 15 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:12,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:12,085 INFO L93 Difference]: Finished difference Result 160 states and 192 transitions. [2021-05-06 11:09:12,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:09:12,086 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-05-06 11:09:12,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:12,087 INFO L225 Difference]: With dead ends: 160 [2021-05-06 11:09:12,087 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 11:09:12,087 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 267.5ms TimeCoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:09:12,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 11:09:12,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 111. [2021-05-06 11:09:12,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 100 states have (on average 1.2) internal successors, (120), 102 states have internal predecessors, (120), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:12,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 131 transitions. [2021-05-06 11:09:12,107 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 131 transitions. Word has length 41 [2021-05-06 11:09:12,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:12,107 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 131 transitions. [2021-05-06 11:09:12,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:12,107 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 131 transitions. [2021-05-06 11:09:12,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 11:09:12,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:12,108 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:12,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:09:12,108 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:12,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:12,109 INFO L82 PathProgramCache]: Analyzing trace with hash 364945739, now seen corresponding path program 4 times [2021-05-06 11:09:12,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:12,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933550708] [2021-05-06 11:09:12,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:12,112 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:12,112 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:12,113 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:12,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:12,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:12,441 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:12,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933550708] [2021-05-06 11:09:12,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1933550708] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:12,441 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:12,441 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:12,441 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762636986] [2021-05-06 11:09:12,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:12,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:12,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:12,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:12,442 INFO L87 Difference]: Start difference. First operand 111 states and 131 transitions. Second operand has 21 states, 20 states have (on average 1.95) internal successors, (39), 19 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 11:09:13,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:13,330 INFO L93 Difference]: Finished difference Result 237 states and 286 transitions. [2021-05-06 11:09:13,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:09:13,330 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 19 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 11:09:13,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:13,331 INFO L225 Difference]: With dead ends: 237 [2021-05-06 11:09:13,331 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 11:09:13,332 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 705.5ms TimeCoverageRelationStatistics Valid=380, Invalid=1782, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:09:13,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 11:09:13,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 110. [2021-05-06 11:09:13,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 99 states have (on average 1.1919191919191918) internal successors, (118), 101 states have internal predecessors, (118), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:13,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 129 transitions. [2021-05-06 11:09:13,351 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 129 transitions. Word has length 43 [2021-05-06 11:09:13,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:13,351 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 129 transitions. [2021-05-06 11:09:13,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 19 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 11:09:13,351 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 129 transitions. [2021-05-06 11:09:13,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:09:13,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:13,352 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:13,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:09:13,352 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:13,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:13,352 INFO L82 PathProgramCache]: Analyzing trace with hash -866950133, now seen corresponding path program 1 times [2021-05-06 11:09:13,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:13,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212518362] [2021-05-06 11:09:13,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:13,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:13,357 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:13,358 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:13,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:13,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:13,479 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:13,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212518362] [2021-05-06 11:09:13,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1212518362] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:13,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:13,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:09:13,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320578462] [2021-05-06 11:09:13,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:09:13,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:13,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:09:13,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:13,481 INFO L87 Difference]: Start difference. First operand 110 states and 129 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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 11:09:13,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:13,739 INFO L93 Difference]: Finished difference Result 279 states and 333 transitions. [2021-05-06 11:09:13,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:13,740 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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 44 [2021-05-06 11:09:13,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:13,741 INFO L225 Difference]: With dead ends: 279 [2021-05-06 11:09:13,741 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 11:09:13,741 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 114.8ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:13,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 11:09:13,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 147. [2021-05-06 11:09:13,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 136 states have (on average 1.1691176470588236) internal successors, (159), 138 states have internal predecessors, (159), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:13,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 170 transitions. [2021-05-06 11:09:13,769 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 170 transitions. Word has length 44 [2021-05-06 11:09:13,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:13,769 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 170 transitions. [2021-05-06 11:09:13,769 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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 11:09:13,769 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 170 transitions. [2021-05-06 11:09:13,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:09:13,769 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:13,769 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:13,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:09:13,770 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:13,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:13,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1980469830, now seen corresponding path program 1 times [2021-05-06 11:09:13,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:13,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194710509] [2021-05-06 11:09:13,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:13,774 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:13,774 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:13,775 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:13,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:13,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-05-06 11:09:13,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,973 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 11:09:13,973 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:13,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194710509] [2021-05-06 11:09:13,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [194710509] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:13,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:13,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:13,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910993623] [2021-05-06 11:09:13,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:13,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:13,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:13,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=236, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:13,974 INFO L87 Difference]: Start difference. First operand 147 states and 170 transitions. Second operand has 17 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:14,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:14,521 INFO L93 Difference]: Finished difference Result 196 states and 229 transitions. [2021-05-06 11:09:14,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:09:14,521 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 11:09:14,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:14,522 INFO L225 Difference]: With dead ends: 196 [2021-05-06 11:09:14,522 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 11:09:14,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 340.5ms TimeCoverageRelationStatistics Valid=114, Invalid=756, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:09:14,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 11:09:14,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 148. [2021-05-06 11:09:14,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 137 states have (on average 1.1751824817518248) internal successors, (161), 139 states have internal predecessors, (161), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:14,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 172 transitions. [2021-05-06 11:09:14,547 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 172 transitions. Word has length 46 [2021-05-06 11:09:14,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:14,547 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 172 transitions. [2021-05-06 11:09:14,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:14,548 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 172 transitions. [2021-05-06 11:09:14,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:09:14,548 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:14,548 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:14,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:09:14,548 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:14,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:14,549 INFO L82 PathProgramCache]: Analyzing trace with hash 1458084557, now seen corresponding path program 2 times [2021-05-06 11:09:14,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:14,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164962040] [2021-05-06 11:09:14,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:14,552 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:14,552 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:14,553 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:14,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:15,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:15,022 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:15,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164962040] [2021-05-06 11:09:15,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [164962040] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:15,022 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:15,022 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:09:15,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536494675] [2021-05-06 11:09:15,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:09:15,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:15,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:09:15,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:15,023 INFO L87 Difference]: Start difference. First operand 148 states and 172 transitions. Second operand has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 22 states have internal predecessors, (42), 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 11:09:15,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:15,947 INFO L93 Difference]: Finished difference Result 283 states and 333 transitions. [2021-05-06 11:09:15,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:09:15,948 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 22 states have internal predecessors, (42), 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 46 [2021-05-06 11:09:15,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:15,949 INFO L225 Difference]: With dead ends: 283 [2021-05-06 11:09:15,949 INFO L226 Difference]: Without dead ends: 226 [2021-05-06 11:09:15,950 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 735.1ms TimeCoverageRelationStatistics Valid=295, Invalid=1427, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:09:15,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-06 11:09:15,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 159. [2021-05-06 11:09:15,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 148 states have (on average 1.1824324324324325) internal successors, (175), 150 states have internal predecessors, (175), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:15,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 186 transitions. [2021-05-06 11:09:15,980 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 186 transitions. Word has length 46 [2021-05-06 11:09:15,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:15,981 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 186 transitions. [2021-05-06 11:09:15,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 22 states have internal predecessors, (42), 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 11:09:15,981 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 186 transitions. [2021-05-06 11:09:15,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:09:15,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:15,981 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:15,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:09:15,982 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:15,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:15,982 INFO L82 PathProgramCache]: Analyzing trace with hash -253360043, now seen corresponding path program 2 times [2021-05-06 11:09:15,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:15,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2067512986] [2021-05-06 11:09:15,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:15,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:15,986 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:15,987 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:16,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:16,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:16,323 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:16,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2067512986] [2021-05-06 11:09:16,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2067512986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:16,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:16,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:16,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971797412] [2021-05-06 11:09:16,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:16,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:16,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:16,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:16,325 INFO L87 Difference]: Start difference. First operand 159 states and 186 transitions. Second operand has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 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 11:09:17,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:17,139 INFO L93 Difference]: Finished difference Result 258 states and 304 transitions. [2021-05-06 11:09:17,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:09:17,139 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 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 46 [2021-05-06 11:09:17,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:17,140 INFO L225 Difference]: With dead ends: 258 [2021-05-06 11:09:17,140 INFO L226 Difference]: Without dead ends: 256 [2021-05-06 11:09:17,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 632.9ms TimeCoverageRelationStatistics Valid=292, Invalid=1348, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:09:17,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-05-06 11:09:17,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 184. [2021-05-06 11:09:17,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 173 states have (on average 1.2080924855491328) internal successors, (209), 175 states have internal predecessors, (209), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:17,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 220 transitions. [2021-05-06 11:09:17,177 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 220 transitions. Word has length 46 [2021-05-06 11:09:17,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:17,177 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 220 transitions. [2021-05-06 11:09:17,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 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 11:09:17,178 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 220 transitions. [2021-05-06 11:09:17,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:09:17,178 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:17,178 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:17,178 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:09:17,178 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:17,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:17,178 INFO L82 PathProgramCache]: Analyzing trace with hash -564916451, now seen corresponding path program 5 times [2021-05-06 11:09:17,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:17,179 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742414104] [2021-05-06 11:09:17,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:17,182 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:17,182 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:17,183 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:17,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:17,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:17,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:17,619 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:17,619 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:17,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742414104] [2021-05-06 11:09:17,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [742414104] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:17,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:17,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:09:17,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356587271] [2021-05-06 11:09:17,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:09:17,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:17,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:09:17,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:17,621 INFO L87 Difference]: Start difference. First operand 184 states and 220 transitions. Second operand has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 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 11:09:18,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:18,391 INFO L93 Difference]: Finished difference Result 251 states and 298 transitions. [2021-05-06 11:09:18,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:09:18,391 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 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 46 [2021-05-06 11:09:18,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:18,392 INFO L225 Difference]: With dead ends: 251 [2021-05-06 11:09:18,393 INFO L226 Difference]: Without dead ends: 249 [2021-05-06 11:09:18,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 666.6ms TimeCoverageRelationStatistics Valid=220, Invalid=1262, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:09:18,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-05-06 11:09:18,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 206. [2021-05-06 11:09:18,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 193 states have (on average 1.2020725388601037) internal successors, (232), 196 states have internal predecessors, (232), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 3 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 11:09:18,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 245 transitions. [2021-05-06 11:09:18,430 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 245 transitions. Word has length 46 [2021-05-06 11:09:18,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:18,430 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 245 transitions. [2021-05-06 11:09:18,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 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 11:09:18,430 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 245 transitions. [2021-05-06 11:09:18,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:09:18,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:18,430 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:18,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:09:18,431 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:18,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:18,431 INFO L82 PathProgramCache]: Analyzing trace with hash -966082275, now seen corresponding path program 3 times [2021-05-06 11:09:18,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:18,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42648669] [2021-05-06 11:09:18,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:18,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:18,434 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:18,435 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:18,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:18,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-06 11:09:18,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:09:18,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:18,549 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:18,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42648669] [2021-05-06 11:09:18,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [42648669] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:18,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:18,549 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:09:18,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425253960] [2021-05-06 11:09:18,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:09:18,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:18,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:09:18,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:18,550 INFO L87 Difference]: Start difference. First operand 206 states and 245 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:18,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:18,831 INFO L93 Difference]: Finished difference Result 303 states and 362 transitions. [2021-05-06 11:09:18,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:09:18,833 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 49 [2021-05-06 11:09:18,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:18,834 INFO L225 Difference]: With dead ends: 303 [2021-05-06 11:09:18,834 INFO L226 Difference]: Without dead ends: 270 [2021-05-06 11:09:18,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 127.8ms TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:18,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-05-06 11:09:18,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 197. [2021-05-06 11:09:18,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 185 states have (on average 1.1837837837837837) internal successors, (219), 188 states have internal predecessors, (219), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:18,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 231 transitions. [2021-05-06 11:09:18,871 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 231 transitions. Word has length 49 [2021-05-06 11:09:18,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:18,871 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 231 transitions. [2021-05-06 11:09:18,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:18,871 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 231 transitions. [2021-05-06 11:09:18,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:09:18,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:18,871 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:18,871 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:09:18,872 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:18,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:18,872 INFO L82 PathProgramCache]: Analyzing trace with hash -146750412, now seen corresponding path program 4 times [2021-05-06 11:09:18,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:18,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562344199] [2021-05-06 11:09:18,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:18,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:18,875 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:18,876 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:18,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:19,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:19,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:19,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:09:19,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:19,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:19,090 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:19,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562344199] [2021-05-06 11:09:19,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1562344199] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:19,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:19,090 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:09:19,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920724166] [2021-05-06 11:09:19,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:09:19,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:19,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:09:19,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:19,091 INFO L87 Difference]: Start difference. First operand 197 states and 231 transitions. Second operand has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 16 states have internal predecessors, (43), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:19,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:19,753 INFO L93 Difference]: Finished difference Result 234 states and 276 transitions. [2021-05-06 11:09:19,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:09:19,757 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 16 states have internal predecessors, (43), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 11:09:19,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:19,758 INFO L225 Difference]: With dead ends: 234 [2021-05-06 11:09:19,758 INFO L226 Difference]: Without dead ends: 232 [2021-05-06 11:09:19,758 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 409.1ms TimeCoverageRelationStatistics Valid=143, Invalid=849, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:09:19,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-05-06 11:09:19,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 211. [2021-05-06 11:09:19,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 195 states have (on average 1.1743589743589744) internal successors, (229), 200 states have internal predecessors, (229), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 11:09:19,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 247 transitions. [2021-05-06 11:09:19,808 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 247 transitions. Word has length 49 [2021-05-06 11:09:19,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:19,808 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 247 transitions. [2021-05-06 11:09:19,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 16 states have internal predecessors, (43), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:19,809 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 247 transitions. [2021-05-06 11:09:19,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:09:19,814 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:19,814 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:19,814 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:09:19,814 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:19,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:19,814 INFO L82 PathProgramCache]: Analyzing trace with hash 554440741, now seen corresponding path program 1 times [2021-05-06 11:09:19,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:19,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777131058] [2021-05-06 11:09:19,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:19,818 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:19,818 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:19,819 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:19,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:20,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-06 11:09:20,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:20,444 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:20,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777131058] [2021-05-06 11:09:20,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1777131058] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:20,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:20,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:09:20,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952893764] [2021-05-06 11:09:20,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:09:20,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:20,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:09:20,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:20,445 INFO L87 Difference]: Start difference. First operand 211 states and 247 transitions. Second operand has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 states have internal predecessors, (45), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:21,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:21,627 INFO L93 Difference]: Finished difference Result 269 states and 311 transitions. [2021-05-06 11:09:21,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:09:21,629 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 states have internal predecessors, (45), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 51 [2021-05-06 11:09:21,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:21,629 INFO L225 Difference]: With dead ends: 269 [2021-05-06 11:09:21,630 INFO L226 Difference]: Without dead ends: 237 [2021-05-06 11:09:21,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 1046.9ms TimeCoverageRelationStatistics Valid=293, Invalid=1963, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:09:21,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-05-06 11:09:21,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 224. [2021-05-06 11:09:21,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 208 states have (on average 1.1634615384615385) internal successors, (242), 213 states have internal predecessors, (242), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 11:09:21,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 260 transitions. [2021-05-06 11:09:21,672 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 260 transitions. Word has length 51 [2021-05-06 11:09:21,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:21,672 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 260 transitions. [2021-05-06 11:09:21,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 states have internal predecessors, (45), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:21,672 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 260 transitions. [2021-05-06 11:09:21,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:09:21,673 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:21,673 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:21,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:09:21,673 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:21,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:21,673 INFO L82 PathProgramCache]: Analyzing trace with hash 455716478, now seen corresponding path program 1 times [2021-05-06 11:09:21,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:21,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460985237] [2021-05-06 11:09:21,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:21,677 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:21,677 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:21,678 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:21,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:21,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:21,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:21,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:21,716 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:21,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460985237] [2021-05-06 11:09:21,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [460985237] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:21,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:21,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:09:21,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757444255] [2021-05-06 11:09:21,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:09:21,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:21,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:09:21,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:21,717 INFO L87 Difference]: Start difference. First operand 224 states and 260 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 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 11:09:21,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:21,855 INFO L93 Difference]: Finished difference Result 310 states and 365 transitions. [2021-05-06 11:09:21,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:21,855 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 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 51 [2021-05-06 11:09:21,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:21,856 INFO L225 Difference]: With dead ends: 310 [2021-05-06 11:09:21,856 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 11:09:21,856 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 30.1ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:21,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 11:09:21,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 212. [2021-05-06 11:09:21,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 196 states have (on average 1.1479591836734695) internal successors, (225), 201 states have internal predecessors, (225), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 11:09:21,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 243 transitions. [2021-05-06 11:09:21,898 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 243 transitions. Word has length 51 [2021-05-06 11:09:21,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:21,898 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 243 transitions. [2021-05-06 11:09:21,898 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 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 11:09:21,898 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 243 transitions. [2021-05-06 11:09:21,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:09:21,899 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:21,899 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:21,899 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:09:21,899 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:21,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:21,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1181899854, now seen corresponding path program 1 times [2021-05-06 11:09:21,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:21,900 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748206208] [2021-05-06 11:09:21,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:21,903 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:21,903 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:21,904 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:21,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:22,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:22,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:22,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:22,393 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:22,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748206208] [2021-05-06 11:09:22,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [748206208] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:22,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:22,393 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:09:22,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609379272] [2021-05-06 11:09:22,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:09:22,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:22,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:09:22,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:22,394 INFO L87 Difference]: Start difference. First operand 212 states and 243 transitions. Second operand has 23 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 21 states have internal predecessors, (47), 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 11:09:23,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:23,584 INFO L93 Difference]: Finished difference Result 333 states and 390 transitions. [2021-05-06 11:09:23,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:09:23,584 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 21 states have internal predecessors, (47), 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 51 [2021-05-06 11:09:23,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:23,588 INFO L225 Difference]: With dead ends: 333 [2021-05-06 11:09:23,588 INFO L226 Difference]: Without dead ends: 331 [2021-05-06 11:09:23,589 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 5 SyntacticMatches, 8 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 960.7ms TimeCoverageRelationStatistics Valid=357, Invalid=1899, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:09:23,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-05-06 11:09:23,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 232. [2021-05-06 11:09:23,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 216 states have (on average 1.1666666666666667) internal successors, (252), 221 states have internal predecessors, (252), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 11:09:23,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 270 transitions. [2021-05-06 11:09:23,637 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 270 transitions. Word has length 51 [2021-05-06 11:09:23,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:23,637 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 270 transitions. [2021-05-06 11:09:23,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 21 states have internal predecessors, (47), 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 11:09:23,637 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 270 transitions. [2021-05-06 11:09:23,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:09:23,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:23,638 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:23,638 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:09:23,638 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:23,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:23,638 INFO L82 PathProgramCache]: Analyzing trace with hash -186725060, now seen corresponding path program 6 times [2021-05-06 11:09:23,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:23,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989589780] [2021-05-06 11:09:23,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:23,643 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:23,643 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:23,643 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:23,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:24,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:24,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:24,056 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:24,057 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:24,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989589780] [2021-05-06 11:09:24,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1989589780] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:24,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:24,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:09:24,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463953864] [2021-05-06 11:09:24,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:09:24,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:24,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:09:24,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:24,058 INFO L87 Difference]: Start difference. First operand 232 states and 270 transitions. Second operand has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 22 states have internal predecessors, (45), 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 11:09:25,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:25,203 INFO L93 Difference]: Finished difference Result 338 states and 403 transitions. [2021-05-06 11:09:25,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:09:25,204 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 22 states have internal predecessors, (45), 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 51 [2021-05-06 11:09:25,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:25,205 INFO L225 Difference]: With dead ends: 338 [2021-05-06 11:09:25,205 INFO L226 Difference]: Without dead ends: 336 [2021-05-06 11:09:25,206 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 809.9ms TimeCoverageRelationStatistics Valid=269, Invalid=1537, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:09:25,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2021-05-06 11:09:25,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 255. [2021-05-06 11:09:25,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 240 states have (on average 1.1875) internal successors, (285), 244 states have internal predecessors, (285), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 11:09:25,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 301 transitions. [2021-05-06 11:09:25,262 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 301 transitions. Word has length 51 [2021-05-06 11:09:25,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:25,262 INFO L480 AbstractCegarLoop]: Abstraction has 255 states and 301 transitions. [2021-05-06 11:09:25,262 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 22 states have internal predecessors, (45), 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 11:09:25,262 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 301 transitions. [2021-05-06 11:09:25,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:09:25,262 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:25,262 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:25,263 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:09:25,263 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:25,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:25,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1824744982, now seen corresponding path program 2 times [2021-05-06 11:09:25,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:25,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [908599397] [2021-05-06 11:09:25,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:25,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:25,269 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:25,270 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:25,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:25,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:25,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:25,781 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:25,782 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:25,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [908599397] [2021-05-06 11:09:25,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [908599397] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:25,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:25,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:09:25,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798684292] [2021-05-06 11:09:25,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:09:25,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:25,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:09:25,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=529, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:25,783 INFO L87 Difference]: Start difference. First operand 255 states and 301 transitions. Second operand has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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 11:09:26,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:26,670 INFO L93 Difference]: Finished difference Result 391 states and 466 transitions. [2021-05-06 11:09:26,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:09:26,670 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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 51 [2021-05-06 11:09:26,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:26,671 INFO L225 Difference]: With dead ends: 391 [2021-05-06 11:09:26,671 INFO L226 Difference]: Without dead ends: 317 [2021-05-06 11:09:26,672 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 723.7ms TimeCoverageRelationStatistics Valid=253, Invalid=1387, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:09:26,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-06 11:09:26,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 267. [2021-05-06 11:09:26,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 252 states have (on average 1.1944444444444444) internal successors, (301), 256 states have internal predecessors, (301), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 11:09:26,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 317 transitions. [2021-05-06 11:09:26,728 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 317 transitions. Word has length 51 [2021-05-06 11:09:26,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:26,728 INFO L480 AbstractCegarLoop]: Abstraction has 267 states and 317 transitions. [2021-05-06 11:09:26,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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 11:09:26,728 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 317 transitions. [2021-05-06 11:09:26,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:09:26,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:26,728 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:26,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:09:26,729 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:26,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:26,729 INFO L82 PathProgramCache]: Analyzing trace with hash 636186535, now seen corresponding path program 1 times [2021-05-06 11:09:26,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:26,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096349790] [2021-05-06 11:09:26,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:26,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:26,732 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:26,733 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:26,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:26,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:26,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:26,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-06 11:09:26,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:26,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:26,932 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:26,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096349790] [2021-05-06 11:09:26,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2096349790] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:26,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:26,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:26,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893001633] [2021-05-06 11:09:26,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:26,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:26,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:26,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:26,932 INFO L87 Difference]: Start difference. First operand 267 states and 317 transitions. Second operand has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:27,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:27,766 INFO L93 Difference]: Finished difference Result 544 states and 666 transitions. [2021-05-06 11:09:27,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:09:27,767 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 54 [2021-05-06 11:09:27,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:27,768 INFO L225 Difference]: With dead ends: 544 [2021-05-06 11:09:27,768 INFO L226 Difference]: Without dead ends: 421 [2021-05-06 11:09:27,769 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 517.2ms TimeCoverageRelationStatistics Valid=302, Invalid=1678, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:09:27,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-05-06 11:09:27,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 318. [2021-05-06 11:09:27,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 298 states have (on average 1.2013422818791946) internal successors, (358), 305 states have internal predecessors, (358), 13 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (11), 5 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 11:09:27,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 382 transitions. [2021-05-06 11:09:27,845 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 382 transitions. Word has length 54 [2021-05-06 11:09:27,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:27,845 INFO L480 AbstractCegarLoop]: Abstraction has 318 states and 382 transitions. [2021-05-06 11:09:27,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:27,845 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 382 transitions. [2021-05-06 11:09:27,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:09:27,846 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:27,846 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:27,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:09:27,846 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:27,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:27,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1518785839, now seen corresponding path program 2 times [2021-05-06 11:09:27,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:27,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655953177] [2021-05-06 11:09:27,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:27,850 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:27,850 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:27,850 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:27,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:28,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:28,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:28,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-06 11:09:28,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:28,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:28,359 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:28,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655953177] [2021-05-06 11:09:28,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1655953177] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:28,360 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:28,360 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:09:28,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589298580] [2021-05-06 11:09:28,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:09:28,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:28,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:09:28,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:28,360 INFO L87 Difference]: Start difference. First operand 318 states and 382 transitions. Second operand has 26 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:29,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:29,465 INFO L93 Difference]: Finished difference Result 478 states and 571 transitions. [2021-05-06 11:09:29,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:09:29,466 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 54 [2021-05-06 11:09:29,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:29,467 INFO L225 Difference]: With dead ends: 478 [2021-05-06 11:09:29,467 INFO L226 Difference]: Without dead ends: 384 [2021-05-06 11:09:29,467 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 883.5ms TimeCoverageRelationStatistics Valid=280, Invalid=1700, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:09:29,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-05-06 11:09:29,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 321. [2021-05-06 11:09:29,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 301 states have (on average 1.1993355481727574) internal successors, (361), 308 states have internal predecessors, (361), 13 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (11), 5 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 11:09:29,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 385 transitions. [2021-05-06 11:09:29,543 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 385 transitions. Word has length 54 [2021-05-06 11:09:29,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:29,543 INFO L480 AbstractCegarLoop]: Abstraction has 321 states and 385 transitions. [2021-05-06 11:09:29,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:29,543 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 385 transitions. [2021-05-06 11:09:29,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:09:29,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:29,544 INFO L523 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:29,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:09:29,544 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:29,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:29,544 INFO L82 PathProgramCache]: Analyzing trace with hash -676055644, now seen corresponding path program 2 times [2021-05-06 11:09:29,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:29,544 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525901552] [2021-05-06 11:09:29,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:29,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:29,548 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:29,549 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:29,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:30,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:30,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:30,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-06 11:09:30,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:30,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:30,200 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:30,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525901552] [2021-05-06 11:09:30,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [525901552] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:30,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:30,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:09:30,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891593678] [2021-05-06 11:09:30,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:09:30,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:30,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:09:30,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:09:30,201 INFO L87 Difference]: Start difference. First operand 321 states and 385 transitions. Second operand has 30 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 28 states have internal predecessors, (50), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:31,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:31,444 INFO L93 Difference]: Finished difference Result 384 states and 463 transitions. [2021-05-06 11:09:31,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:09:31,444 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 28 states have internal predecessors, (50), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 56 [2021-05-06 11:09:31,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:31,445 INFO L225 Difference]: With dead ends: 384 [2021-05-06 11:09:31,445 INFO L226 Difference]: Without dead ends: 346 [2021-05-06 11:09:31,446 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1074.9ms TimeCoverageRelationStatistics Valid=309, Invalid=2447, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:09:31,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-05-06 11:09:31,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 288. [2021-05-06 11:09:31,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 272 states have (on average 1.224264705882353) internal successors, (333), 277 states have internal predecessors, (333), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (9), 4 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 11:09:31,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 352 transitions. [2021-05-06 11:09:31,510 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 352 transitions. Word has length 56 [2021-05-06 11:09:31,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:31,510 INFO L480 AbstractCegarLoop]: Abstraction has 288 states and 352 transitions. [2021-05-06 11:09:31,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 28 states have internal predecessors, (50), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:31,510 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 352 transitions. [2021-05-06 11:09:31,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:09:31,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:31,511 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:31,511 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:09:31,511 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:31,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:31,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1953283570, now seen corresponding path program 5 times [2021-05-06 11:09:31,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:31,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1855366912] [2021-05-06 11:09:31,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:31,515 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:31,515 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:31,515 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:31,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:31,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:31,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:31,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:09:31,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:31,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:09:31,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:31,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:31,841 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:31,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1855366912] [2021-05-06 11:09:31,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1855366912] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:31,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:31,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:31,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666468223] [2021-05-06 11:09:31,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:31,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:31,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:31,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:31,841 INFO L87 Difference]: Start difference. First operand 288 states and 352 transitions. Second operand has 20 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:32,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:32,549 INFO L93 Difference]: Finished difference Result 468 states and 570 transitions. [2021-05-06 11:09:32,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:09:32,549 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 57 [2021-05-06 11:09:32,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:32,551 INFO L225 Difference]: With dead ends: 468 [2021-05-06 11:09:32,551 INFO L226 Difference]: Without dead ends: 394 [2021-05-06 11:09:32,551 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 501.9ms TimeCoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:09:32,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-05-06 11:09:32,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 329. [2021-05-06 11:09:32,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 305 states have (on average 1.2065573770491804) internal successors, (368), 313 states have internal predecessors, (368), 17 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (16), 8 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 11:09:32,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 401 transitions. [2021-05-06 11:09:32,630 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 401 transitions. Word has length 57 [2021-05-06 11:09:32,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:32,630 INFO L480 AbstractCegarLoop]: Abstraction has 329 states and 401 transitions. [2021-05-06 11:09:32,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:32,630 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 401 transitions. [2021-05-06 11:09:32,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:09:32,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:32,631 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:32,631 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:09:32,631 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:32,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:32,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1889457963, now seen corresponding path program 3 times [2021-05-06 11:09:32,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:32,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980024417] [2021-05-06 11:09:32,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:32,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:32,634 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:32,635 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:32,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:33,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:33,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:33,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:33,108 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:33,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980024417] [2021-05-06 11:09:33,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1980024417] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:33,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:33,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:09:33,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7910663] [2021-05-06 11:09:33,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:09:33,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:33,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:09:33,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:09:33,109 INFO L87 Difference]: Start difference. First operand 329 states and 401 transitions. Second operand has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 23 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 11:09:34,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:34,198 INFO L93 Difference]: Finished difference Result 383 states and 468 transitions. [2021-05-06 11:09:34,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:09:34,199 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 23 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 56 [2021-05-06 11:09:34,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:34,200 INFO L225 Difference]: With dead ends: 383 [2021-05-06 11:09:34,200 INFO L226 Difference]: Without dead ends: 381 [2021-05-06 11:09:34,201 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 1018.6ms TimeCoverageRelationStatistics Valid=344, Invalid=1818, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:09:34,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2021-05-06 11:09:34,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 333. [2021-05-06 11:09:34,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 308 states have (on average 1.2045454545454546) internal successors, (371), 316 states have internal predecessors, (371), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (16), 8 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 11:09:34,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 404 transitions. [2021-05-06 11:09:34,282 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 404 transitions. Word has length 56 [2021-05-06 11:09:34,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:34,282 INFO L480 AbstractCegarLoop]: Abstraction has 333 states and 404 transitions. [2021-05-06 11:09:34,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 23 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 11:09:34,282 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 404 transitions. [2021-05-06 11:09:34,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:09:34,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:34,283 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:34,283 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:09:34,283 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:34,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:34,283 INFO L82 PathProgramCache]: Analyzing trace with hash -439649873, now seen corresponding path program 2 times [2021-05-06 11:09:34,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:34,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158389019] [2021-05-06 11:09:34,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:34,287 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:34,287 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:34,287 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:34,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:34,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:34,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:34,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:34,403 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:34,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158389019] [2021-05-06 11:09:34,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1158389019] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:34,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:34,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:09:34,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739034636] [2021-05-06 11:09:34,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:09:34,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:34,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:09:34,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:34,404 INFO L87 Difference]: Start difference. First operand 333 states and 404 transitions. Second operand has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 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 11:09:34,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:34,807 INFO L93 Difference]: Finished difference Result 772 states and 946 transitions. [2021-05-06 11:09:34,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:09:34,808 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 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 57 [2021-05-06 11:09:34,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:34,809 INFO L225 Difference]: With dead ends: 772 [2021-05-06 11:09:34,810 INFO L226 Difference]: Without dead ends: 614 [2021-05-06 11:09:34,810 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 130.8ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:34,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-05-06 11:09:34,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 453. [2021-05-06 11:09:34,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 428 states have (on average 1.1822429906542056) internal successors, (506), 436 states have internal predecessors, (506), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (16), 8 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 11:09:34,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 539 transitions. [2021-05-06 11:09:34,923 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 539 transitions. Word has length 57 [2021-05-06 11:09:34,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:34,923 INFO L480 AbstractCegarLoop]: Abstraction has 453 states and 539 transitions. [2021-05-06 11:09:34,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 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 11:09:34,924 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 539 transitions. [2021-05-06 11:09:34,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:09:34,924 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:34,924 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:34,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:09:34,925 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:34,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:34,925 INFO L82 PathProgramCache]: Analyzing trace with hash 358973142, now seen corresponding path program 1 times [2021-05-06 11:09:34,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:34,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1615646397] [2021-05-06 11:09:34,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:34,928 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:34,929 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:34,929 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:34,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:35,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:35,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:35,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-05-06 11:09:35,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:35,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:35,115 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:35,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1615646397] [2021-05-06 11:09:35,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1615646397] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:35,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:35,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:09:35,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30216] [2021-05-06 11:09:35,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:09:35,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:35,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:09:35,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:35,116 INFO L87 Difference]: Start difference. First operand 453 states and 539 transitions. Second operand has 18 states, 17 states have (on average 2.588235294117647) internal successors, (44), 16 states have internal predecessors, (44), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:36,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:36,025 INFO L93 Difference]: Finished difference Result 537 states and 644 transitions. [2021-05-06 11:09:36,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:09:36,025 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.588235294117647) internal successors, (44), 16 states have internal predecessors, (44), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 59 [2021-05-06 11:09:36,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:36,027 INFO L225 Difference]: With dead ends: 537 [2021-05-06 11:09:36,027 INFO L226 Difference]: Without dead ends: 535 [2021-05-06 11:09:36,028 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 496.3ms TimeCoverageRelationStatistics Valid=177, Invalid=1305, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:09:36,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-06 11:09:36,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 465. [2021-05-06 11:09:36,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 439 states have (on average 1.182232346241458) internal successors, (519), 448 states have internal predecessors, (519), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (17), 8 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 11:09:36,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 554 transitions. [2021-05-06 11:09:36,148 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 554 transitions. Word has length 59 [2021-05-06 11:09:36,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:36,148 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 554 transitions. [2021-05-06 11:09:36,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 2.588235294117647) internal successors, (44), 16 states have internal predecessors, (44), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:36,149 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 554 transitions. [2021-05-06 11:09:36,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:09:36,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:36,150 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:36,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:09:36,150 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:36,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:36,150 INFO L82 PathProgramCache]: Analyzing trace with hash 356238102, now seen corresponding path program 3 times [2021-05-06 11:09:36,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:36,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264973085] [2021-05-06 11:09:36,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:36,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:36,154 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:36,154 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:36,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:36,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:36,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:36,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-05-06 11:09:36,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:36,981 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:36,981 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:36,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264973085] [2021-05-06 11:09:36,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [264973085] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:36,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:36,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:09:36,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117659260] [2021-05-06 11:09:36,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:09:36,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:36,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:09:36,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=857, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:09:36,982 INFO L87 Difference]: Start difference. First operand 465 states and 554 transitions. Second operand has 32 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 30 states have internal predecessors, (53), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:39,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:39,224 INFO L93 Difference]: Finished difference Result 546 states and 645 transitions. [2021-05-06 11:09:39,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:09:39,224 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 30 states have internal predecessors, (53), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 59 [2021-05-06 11:09:39,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:39,226 INFO L225 Difference]: With dead ends: 546 [2021-05-06 11:09:39,226 INFO L226 Difference]: Without dead ends: 544 [2021-05-06 11:09:39,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 2002.5ms TimeCoverageRelationStatistics Valid=643, Invalid=4327, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:09:39,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-05-06 11:09:39,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 469. [2021-05-06 11:09:39,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 442 states have (on average 1.1809954751131222) internal successors, (522), 451 states have internal predecessors, (522), 18 states have call successors, (18), 9 states have call predecessors, (18), 8 states have return successors, (17), 8 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 11:09:39,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 557 transitions. [2021-05-06 11:09:39,348 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 557 transitions. Word has length 59 [2021-05-06 11:09:39,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:39,348 INFO L480 AbstractCegarLoop]: Abstraction has 469 states and 557 transitions. [2021-05-06 11:09:39,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 30 states have internal predecessors, (53), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:39,348 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 557 transitions. [2021-05-06 11:09:39,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:09:39,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:39,349 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:39,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:09:39,349 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:39,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:39,349 INFO L82 PathProgramCache]: Analyzing trace with hash -403648979, now seen corresponding path program 3 times [2021-05-06 11:09:39,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:39,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009987275] [2021-05-06 11:09:39,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:39,353 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:39,353 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:39,354 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:39,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:39,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:39,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:39,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:39,662 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:39,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009987275] [2021-05-06 11:09:39,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2009987275] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:39,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:39,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:39,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686321213] [2021-05-06 11:09:39,662 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:39,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:39,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:39,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:39,663 INFO L87 Difference]: Start difference. First operand 469 states and 557 transitions. Second operand has 21 states, 20 states have (on average 2.4) internal successors, (48), 19 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 11:09:40,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:40,664 INFO L93 Difference]: Finished difference Result 534 states and 636 transitions. [2021-05-06 11:09:40,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:09:40,665 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.4) internal successors, (48), 19 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 59 [2021-05-06 11:09:40,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:40,666 INFO L225 Difference]: With dead ends: 534 [2021-05-06 11:09:40,666 INFO L226 Difference]: Without dead ends: 532 [2021-05-06 11:09:40,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 651.9ms TimeCoverageRelationStatistics Valid=310, Invalid=1330, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:09:40,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-05-06 11:09:40,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 477. [2021-05-06 11:09:40,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 451 states have (on average 1.1840354767184036) internal successors, (534), 459 states have internal predecessors, (534), 17 states have call successors, (17), 9 states have call predecessors, (17), 8 states have return successors, (16), 8 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 11:09:40,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 567 transitions. [2021-05-06 11:09:40,789 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 567 transitions. Word has length 59 [2021-05-06 11:09:40,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:40,789 INFO L480 AbstractCegarLoop]: Abstraction has 477 states and 567 transitions. [2021-05-06 11:09:40,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.4) internal successors, (48), 19 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 11:09:40,789 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 567 transitions. [2021-05-06 11:09:40,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:09:40,790 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:40,790 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:40,790 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:09:40,790 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:40,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:40,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1813715541, now seen corresponding path program 4 times [2021-05-06 11:09:40,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:40,791 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767147021] [2021-05-06 11:09:40,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:40,801 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:40,801 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:40,802 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:40,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:41,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:41,355 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:41,355 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767147021] [2021-05-06 11:09:41,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [767147021] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:41,356 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:41,356 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:09:41,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851116964] [2021-05-06 11:09:41,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:09:41,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:41,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:09:41,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:09:41,356 INFO L87 Difference]: Start difference. First operand 477 states and 567 transitions. Second operand has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 25 states have internal predecessors, (51), 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 11:09:42,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:42,484 INFO L93 Difference]: Finished difference Result 654 states and 777 transitions. [2021-05-06 11:09:42,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:09:42,484 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 25 states have internal predecessors, (51), 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 59 [2021-05-06 11:09:42,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:42,486 INFO L225 Difference]: With dead ends: 654 [2021-05-06 11:09:42,486 INFO L226 Difference]: Without dead ends: 556 [2021-05-06 11:09:42,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 791.9ms TimeCoverageRelationStatistics Valid=254, Invalid=1552, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:09:42,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-06 11:09:42,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 501. [2021-05-06 11:09:42,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 472 states have (on average 1.1822033898305084) internal successors, (558), 482 states have internal predecessors, (558), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (18), 8 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 11:09:42,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 595 transitions. [2021-05-06 11:09:42,623 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 595 transitions. Word has length 59 [2021-05-06 11:09:42,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:42,623 INFO L480 AbstractCegarLoop]: Abstraction has 501 states and 595 transitions. [2021-05-06 11:09:42,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 25 states have internal predecessors, (51), 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 11:09:42,623 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 595 transitions. [2021-05-06 11:09:42,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:09:42,624 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:42,624 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:42,624 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:09:42,624 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:42,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:42,624 INFO L82 PathProgramCache]: Analyzing trace with hash -715377509, now seen corresponding path program 5 times [2021-05-06 11:09:42,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:42,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001383129] [2021-05-06 11:09:42,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:42,629 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:42,629 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:42,630 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:42,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:43,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:43,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:43,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:43,433 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:43,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001383129] [2021-05-06 11:09:43,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2001383129] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:43,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:43,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:09:43,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153628074] [2021-05-06 11:09:43,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:09:43,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:43,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:09:43,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:09:43,434 INFO L87 Difference]: Start difference. First operand 501 states and 595 transitions. Second operand has 32 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 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 11:09:45,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:45,178 INFO L93 Difference]: Finished difference Result 610 states and 726 transitions. [2021-05-06 11:09:45,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:09:45,179 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 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 59 [2021-05-06 11:09:45,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:45,181 INFO L225 Difference]: With dead ends: 610 [2021-05-06 11:09:45,181 INFO L226 Difference]: Without dead ends: 608 [2021-05-06 11:09:45,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 5 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 1383.2ms TimeCoverageRelationStatistics Valid=544, Invalid=2762, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:09:45,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2021-05-06 11:09:45,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 501. [2021-05-06 11:09:45,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 472 states have (on average 1.1822033898305084) internal successors, (558), 482 states have internal predecessors, (558), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (18), 8 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 11:09:45,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 595 transitions. [2021-05-06 11:09:45,322 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 595 transitions. Word has length 59 [2021-05-06 11:09:45,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:45,322 INFO L480 AbstractCegarLoop]: Abstraction has 501 states and 595 transitions. [2021-05-06 11:09:45,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 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 11:09:45,323 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 595 transitions. [2021-05-06 11:09:45,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:09:45,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:45,324 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:45,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:09:45,324 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:45,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:45,324 INFO L82 PathProgramCache]: Analyzing trace with hash -1054815615, now seen corresponding path program 2 times [2021-05-06 11:09:45,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:45,324 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872800267] [2021-05-06 11:09:45,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:45,327 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:45,327 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:45,328 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:45,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:45,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-06 11:09:45,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-06 11:09:45,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:45,645 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:45,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872800267] [2021-05-06 11:09:45,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1872800267] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:45,645 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:45,645 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:45,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803219708] [2021-05-06 11:09:45,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:45,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:45,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:45,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:45,646 INFO L87 Difference]: Start difference. First operand 501 states and 595 transitions. Second operand has 21 states, 20 states have (on average 2.55) internal successors, (51), 19 states have internal predecessors, (51), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:46,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:46,526 INFO L93 Difference]: Finished difference Result 579 states and 690 transitions. [2021-05-06 11:09:46,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:09:46,533 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 19 states have internal predecessors, (51), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 62 [2021-05-06 11:09:46,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:46,534 INFO L225 Difference]: With dead ends: 579 [2021-05-06 11:09:46,534 INFO L226 Difference]: Without dead ends: 577 [2021-05-06 11:09:46,535 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 559.4ms TimeCoverageRelationStatistics Valid=167, Invalid=955, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:09:46,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-05-06 11:09:46,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 498. [2021-05-06 11:09:46,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 498 states, 469 states have (on average 1.183368869936034) internal successors, (555), 479 states have internal predecessors, (555), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (18), 8 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 11:09:46,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 498 states to 498 states and 592 transitions. [2021-05-06 11:09:46,681 INFO L78 Accepts]: Start accepts. Automaton has 498 states and 592 transitions. Word has length 62 [2021-05-06 11:09:46,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:46,681 INFO L480 AbstractCegarLoop]: Abstraction has 498 states and 592 transitions. [2021-05-06 11:09:46,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 19 states have internal predecessors, (51), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:46,681 INFO L276 IsEmpty]: Start isEmpty. Operand 498 states and 592 transitions. [2021-05-06 11:09:46,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:09:46,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:46,682 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:46,682 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:09:46,682 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:46,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:46,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1873320726, now seen corresponding path program 3 times [2021-05-06 11:09:46,682 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:46,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2143017672] [2021-05-06 11:09:46,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:46,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:46,686 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:46,686 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:46,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:47,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:47,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:47,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-06 11:09:47,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:47,083 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:47,083 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:47,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2143017672] [2021-05-06 11:09:47,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2143017672] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:47,083 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:47,083 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:47,083 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696121834] [2021-05-06 11:09:47,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:47,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:47,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:47,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:47,084 INFO L87 Difference]: Start difference. First operand 498 states and 592 transitions. Second operand has 22 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 20 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:48,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:48,049 INFO L93 Difference]: Finished difference Result 630 states and 755 transitions. [2021-05-06 11:09:48,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:09:48,050 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 20 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 62 [2021-05-06 11:09:48,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:48,051 INFO L225 Difference]: With dead ends: 630 [2021-05-06 11:09:48,051 INFO L226 Difference]: Without dead ends: 628 [2021-05-06 11:09:48,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 572.3ms TimeCoverageRelationStatistics Valid=224, Invalid=1336, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:09:48,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-05-06 11:09:48,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 528. [2021-05-06 11:09:48,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 528 states, 497 states have (on average 1.1891348088531186) internal successors, (591), 509 states have internal predecessors, (591), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (19), 7 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 11:09:48,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 528 states to 528 states and 630 transitions. [2021-05-06 11:09:48,198 INFO L78 Accepts]: Start accepts. Automaton has 528 states and 630 transitions. Word has length 62 [2021-05-06 11:09:48,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:48,199 INFO L480 AbstractCegarLoop]: Abstraction has 528 states and 630 transitions. [2021-05-06 11:09:48,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 20 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:48,199 INFO L276 IsEmpty]: Start isEmpty. Operand 528 states and 630 transitions. [2021-05-06 11:09:48,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:09:48,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:48,200 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:48,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:09:48,200 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:48,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:48,200 INFO L82 PathProgramCache]: Analyzing trace with hash -2048520356, now seen corresponding path program 4 times [2021-05-06 11:09:48,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:48,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573900732] [2021-05-06 11:09:48,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:48,204 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:48,204 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:48,205 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:48,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:48,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:48,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:48,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-06 11:09:48,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:48,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:48,463 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:48,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573900732] [2021-05-06 11:09:48,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1573900732] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:48,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:48,463 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:48,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505030685] [2021-05-06 11:09:48,464 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:48,464 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:48,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:48,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:48,464 INFO L87 Difference]: Start difference. First operand 528 states and 630 transitions. Second operand has 22 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 20 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:49,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:49,509 INFO L93 Difference]: Finished difference Result 696 states and 837 transitions. [2021-05-06 11:09:49,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:09:49,509 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 20 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 62 [2021-05-06 11:09:49,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:49,511 INFO L225 Difference]: With dead ends: 696 [2021-05-06 11:09:49,511 INFO L226 Difference]: Without dead ends: 694 [2021-05-06 11:09:49,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 561.6ms TimeCoverageRelationStatistics Valid=256, Invalid=1636, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:09:49,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 694 states. [2021-05-06 11:09:49,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 694 to 522. [2021-05-06 11:09:49,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 494 states have (on average 1.1983805668016194) internal successors, (592), 504 states have internal predecessors, (592), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (17), 7 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 11:09:49,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 627 transitions. [2021-05-06 11:09:49,670 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 627 transitions. Word has length 62 [2021-05-06 11:09:49,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:49,670 INFO L480 AbstractCegarLoop]: Abstraction has 522 states and 627 transitions. [2021-05-06 11:09:49,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 20 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:49,671 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 627 transitions. [2021-05-06 11:09:49,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:09:49,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:49,672 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:49,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:09:49,672 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:49,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:49,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1980682524, now seen corresponding path program 3 times [2021-05-06 11:09:49,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:49,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53906147] [2021-05-06 11:09:49,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:49,677 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:49,677 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:49,678 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:49,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:50,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:50,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:50,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-06 11:09:50,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:50,305 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 11:09:50,305 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:50,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53906147] [2021-05-06 11:09:50,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [53906147] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:50,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:50,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:09:50,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549448445] [2021-05-06 11:09:50,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:09:50,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:50,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:09:50,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=758, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:09:50,306 INFO L87 Difference]: Start difference. First operand 522 states and 627 transitions. Second operand has 30 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 28 states have internal predecessors, (56), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:52,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:52,033 INFO L93 Difference]: Finished difference Result 795 states and 960 transitions. [2021-05-06 11:09:52,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:09:52,034 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 28 states have internal predecessors, (56), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 62 [2021-05-06 11:09:52,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:52,049 INFO L225 Difference]: With dead ends: 795 [2021-05-06 11:09:52,049 INFO L226 Difference]: Without dead ends: 793 [2021-05-06 11:09:52,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 960 ImplicationChecksByTransitivity, 1203.2ms TimeCoverageRelationStatistics Valid=441, Invalid=2981, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:09:52,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 793 states. [2021-05-06 11:09:52,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 793 to 528. [2021-05-06 11:09:52,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 528 states, 500 states have (on average 1.198) internal successors, (599), 510 states have internal predecessors, (599), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (17), 7 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 11:09:52,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 528 states to 528 states and 634 transitions. [2021-05-06 11:09:52,205 INFO L78 Accepts]: Start accepts. Automaton has 528 states and 634 transitions. Word has length 62 [2021-05-06 11:09:52,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:52,205 INFO L480 AbstractCegarLoop]: Abstraction has 528 states and 634 transitions. [2021-05-06 11:09:52,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 28 states have internal predecessors, (56), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:52,205 INFO L276 IsEmpty]: Start isEmpty. Operand 528 states and 634 transitions. [2021-05-06 11:09:52,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:09:52,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:52,206 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:52,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:09:52,206 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:52,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:52,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1516193256, now seen corresponding path program 6 times [2021-05-06 11:09:52,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:52,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [299584733] [2021-05-06 11:09:52,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:52,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:52,211 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:52,214 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:52,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:52,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:09:52,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:09:52,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 11:09:52,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:52,336 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:52,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [299584733] [2021-05-06 11:09:52,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [299584733] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:52,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:52,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:09:52,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780830531] [2021-05-06 11:09:52,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:09:52,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:52,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:09:52,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:52,337 INFO L87 Difference]: Start difference. First operand 528 states and 634 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:09:52,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:52,855 INFO L93 Difference]: Finished difference Result 714 states and 860 transitions. [2021-05-06 11:09:52,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:09:52,855 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 65 [2021-05-06 11:09:52,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:52,857 INFO L225 Difference]: With dead ends: 714 [2021-05-06 11:09:52,857 INFO L226 Difference]: Without dead ends: 657 [2021-05-06 11:09:52,857 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 182.7ms TimeCoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:52,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2021-05-06 11:09:53,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 485. [2021-05-06 11:09:53,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 459 states have (on average 1.187363834422658) internal successors, (545), 468 states have internal predecessors, (545), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 8 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 11:09:53,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 579 transitions. [2021-05-06 11:09:53,006 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 579 transitions. Word has length 65 [2021-05-06 11:09:53,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:53,006 INFO L480 AbstractCegarLoop]: Abstraction has 485 states and 579 transitions. [2021-05-06 11:09:53,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:09:53,007 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 579 transitions. [2021-05-06 11:09:53,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:09:53,007 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:53,007 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:53,008 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:09:53,008 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:53,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:53,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1181046921, now seen corresponding path program 1 times [2021-05-06 11:09:53,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:53,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541546055] [2021-05-06 11:09:53,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:53,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:53,011 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:53,011 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:53,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:53,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:53,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:53,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-06 11:09:53,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:53,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:53,831 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:53,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541546055] [2021-05-06 11:09:53,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1541546055] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:53,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:53,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:09:53,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390869233] [2021-05-06 11:09:53,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:09:53,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:53,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:09:53,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:09:53,832 INFO L87 Difference]: Start difference. First operand 485 states and 579 transitions. Second operand has 33 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:58,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:58,608 INFO L93 Difference]: Finished difference Result 1012 states and 1229 transitions. [2021-05-06 11:09:58,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 11:09:58,608 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 11:09:58,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:58,611 INFO L225 Difference]: With dead ends: 1012 [2021-05-06 11:09:58,611 INFO L226 Difference]: Without dead ends: 898 [2021-05-06 11:09:58,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3678 ImplicationChecksByTransitivity, 3705.2ms TimeCoverageRelationStatistics Valid=1467, Invalid=10305, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:09:58,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2021-05-06 11:09:58,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 637. [2021-05-06 11:09:58,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 637 states, 604 states have (on average 1.1887417218543046) internal successors, (718), 617 states have internal predecessors, (718), 24 states have call successors, (24), 9 states have call predecessors, (24), 8 states have return successors, (22), 10 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-06 11:09:58,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 637 states to 637 states and 764 transitions. [2021-05-06 11:09:58,821 INFO L78 Accepts]: Start accepts. Automaton has 637 states and 764 transitions. Word has length 64 [2021-05-06 11:09:58,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:58,821 INFO L480 AbstractCegarLoop]: Abstraction has 637 states and 764 transitions. [2021-05-06 11:09:58,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:58,821 INFO L276 IsEmpty]: Start isEmpty. Operand 637 states and 764 transitions. [2021-05-06 11:09:58,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:09:58,822 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:58,822 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:58,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:09:58,823 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:58,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:58,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1602966465, now seen corresponding path program 7 times [2021-05-06 11:09:58,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:58,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047021639] [2021-05-06 11:09:58,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:58,831 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:58,831 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:58,832 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:58,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:59,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:59,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:59,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:09:59,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:59,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 11:09:59,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:59,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:59,135 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:59,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047021639] [2021-05-06 11:09:59,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1047021639] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:59,135 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:59,135 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:59,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749544322] [2021-05-06 11:09:59,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:59,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:59,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:59,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:59,135 INFO L87 Difference]: Start difference. First operand 637 states and 764 transitions. Second operand has 21 states, 20 states have (on average 2.6) internal successors, (52), 19 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:59,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:59,877 INFO L93 Difference]: Finished difference Result 707 states and 850 transitions. [2021-05-06 11:09:59,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:09:59,878 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.6) internal successors, (52), 19 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 65 [2021-05-06 11:09:59,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:59,880 INFO L225 Difference]: With dead ends: 707 [2021-05-06 11:09:59,880 INFO L226 Difference]: Without dead ends: 705 [2021-05-06 11:09:59,880 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 392.0ms TimeCoverageRelationStatistics Valid=130, Invalid=740, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:09:59,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705 states. [2021-05-06 11:10:00,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705 to 661. [2021-05-06 11:10:00,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 621 states have (on average 1.183574879227053) internal successors, (735), 637 states have internal predecessors, (735), 30 states have call successors, (30), 10 states have call predecessors, (30), 9 states have return successors, (28), 13 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-06 11:10:00,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 793 transitions. [2021-05-06 11:10:00,108 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 793 transitions. Word has length 65 [2021-05-06 11:10:00,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:00,108 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 793 transitions. [2021-05-06 11:10:00,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.6) internal successors, (52), 19 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:10:00,108 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 793 transitions. [2021-05-06 11:10:00,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:10:00,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:00,109 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:00,110 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:10:00,110 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:00,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:00,110 INFO L82 PathProgramCache]: Analyzing trace with hash 873252058, now seen corresponding path program 4 times [2021-05-06 11:10:00,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:00,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689364988] [2021-05-06 11:10:00,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:00,115 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:00,115 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:00,116 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:00,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:00,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:00,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:00,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:00,563 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:00,564 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689364988] [2021-05-06 11:10:00,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [689364988] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:00,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:00,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:10:00,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570717464] [2021-05-06 11:10:00,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:10:00,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:00,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:10:00,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:10:00,564 INFO L87 Difference]: Start difference. First operand 661 states and 793 transitions. Second operand has 22 states, 22 states have (on average 2.6363636363636362) internal successors, (58), 21 states have internal predecessors, (58), 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 11:10:01,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:01,931 INFO L93 Difference]: Finished difference Result 830 states and 1003 transitions. [2021-05-06 11:10:01,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:10:01,931 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.6363636363636362) internal successors, (58), 21 states have internal predecessors, (58), 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 64 [2021-05-06 11:10:01,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:01,933 INFO L225 Difference]: With dead ends: 830 [2021-05-06 11:10:01,933 INFO L226 Difference]: Without dead ends: 716 [2021-05-06 11:10:01,934 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 979.5ms TimeCoverageRelationStatistics Valid=225, Invalid=1415, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:10:01,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2021-05-06 11:10:02,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 677. [2021-05-06 11:10:02,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 677 states, 637 states have (on average 1.1821036106750393) internal successors, (753), 653 states have internal predecessors, (753), 30 states have call successors, (30), 10 states have call predecessors, (30), 9 states have return successors, (28), 13 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-06 11:10:02,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 677 states to 677 states and 811 transitions. [2021-05-06 11:10:02,180 INFO L78 Accepts]: Start accepts. Automaton has 677 states and 811 transitions. Word has length 64 [2021-05-06 11:10:02,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:02,180 INFO L480 AbstractCegarLoop]: Abstraction has 677 states and 811 transitions. [2021-05-06 11:10:02,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.6363636363636362) internal successors, (58), 21 states have internal predecessors, (58), 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 11:10:02,180 INFO L276 IsEmpty]: Start isEmpty. Operand 677 states and 811 transitions. [2021-05-06 11:10:02,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:10:02,181 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:02,181 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:02,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:10:02,181 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:02,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:02,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1868426852, now seen corresponding path program 6 times [2021-05-06 11:10:02,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:02,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705084769] [2021-05-06 11:10:02,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:02,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:02,185 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:02,185 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:02,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:02,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:02,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:02,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:02,726 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:02,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705084769] [2021-05-06 11:10:02,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1705084769] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:02,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:02,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:10:02,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105378889] [2021-05-06 11:10:02,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:10:02,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:02,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:10:02,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=809, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:10:02,727 INFO L87 Difference]: Start difference. First operand 677 states and 811 transitions. Second operand has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 states have internal predecessors, (57), 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 11:10:05,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:05,104 INFO L93 Difference]: Finished difference Result 947 states and 1137 transitions. [2021-05-06 11:10:05,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 11:10:05,105 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 states have internal predecessors, (57), 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 64 [2021-05-06 11:10:05,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:05,107 INFO L225 Difference]: With dead ends: 947 [2021-05-06 11:10:05,107 INFO L226 Difference]: Without dead ends: 945 [2021-05-06 11:10:05,108 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1502 ImplicationChecksByTransitivity, 1549.3ms TimeCoverageRelationStatistics Valid=776, Invalid=4924, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:10:05,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 945 states. [2021-05-06 11:10:05,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 945 to 697. [2021-05-06 11:10:05,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 697 states, 653 states have (on average 1.1807044410413476) internal successors, (771), 671 states have internal predecessors, (771), 32 states have call successors, (32), 12 states have call predecessors, (32), 11 states have return successors, (30), 13 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-06 11:10:05,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 697 states to 697 states and 833 transitions. [2021-05-06 11:10:05,348 INFO L78 Accepts]: Start accepts. Automaton has 697 states and 833 transitions. Word has length 64 [2021-05-06 11:10:05,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:05,349 INFO L480 AbstractCegarLoop]: Abstraction has 697 states and 833 transitions. [2021-05-06 11:10:05,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 states have internal predecessors, (57), 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 11:10:05,349 INFO L276 IsEmpty]: Start isEmpty. Operand 697 states and 833 transitions. [2021-05-06 11:10:05,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:10:05,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:05,350 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:05,350 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:10:05,350 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:05,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:05,350 INFO L82 PathProgramCache]: Analyzing trace with hash 998054042, now seen corresponding path program 7 times [2021-05-06 11:10:05,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:05,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1621811720] [2021-05-06 11:10:05,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:05,366 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:05,367 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:05,367 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:05,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:05,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:05,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:05,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:05,885 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:05,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1621811720] [2021-05-06 11:10:05,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1621811720] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:05,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:05,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:10:05,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84181857] [2021-05-06 11:10:05,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:10:05,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:05,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:10:05,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:10:05,886 INFO L87 Difference]: Start difference. First operand 697 states and 833 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 states have internal predecessors, (56), 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 11:10:07,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:07,665 INFO L93 Difference]: Finished difference Result 1073 states and 1283 transitions. [2021-05-06 11:10:07,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:10:07,665 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 states have internal predecessors, (56), 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 64 [2021-05-06 11:10:07,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:07,668 INFO L225 Difference]: With dead ends: 1073 [2021-05-06 11:10:07,668 INFO L226 Difference]: Without dead ends: 936 [2021-05-06 11:10:07,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 876 ImplicationChecksByTransitivity, 1290.8ms TimeCoverageRelationStatistics Valid=522, Invalid=3018, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:10:07,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2021-05-06 11:10:07,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 826. [2021-05-06 11:10:07,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 826 states, 774 states have (on average 1.1795865633074936) internal successors, (913), 797 states have internal predecessors, (913), 37 states have call successors, (37), 15 states have call predecessors, (37), 14 states have return successors, (35), 13 states have call predecessors, (35), 35 states have call successors, (35) [2021-05-06 11:10:07,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 826 states to 826 states and 985 transitions. [2021-05-06 11:10:07,957 INFO L78 Accepts]: Start accepts. Automaton has 826 states and 985 transitions. Word has length 64 [2021-05-06 11:10:07,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:07,957 INFO L480 AbstractCegarLoop]: Abstraction has 826 states and 985 transitions. [2021-05-06 11:10:07,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 states have internal predecessors, (56), 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 11:10:07,957 INFO L276 IsEmpty]: Start isEmpty. Operand 826 states and 985 transitions. [2021-05-06 11:10:07,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:10:07,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:07,958 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:07,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:10:07,958 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:07,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:07,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1363947086, now seen corresponding path program 8 times [2021-05-06 11:10:07,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:07,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559932238] [2021-05-06 11:10:07,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:07,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:07,962 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:07,963 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:07,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:08,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:08,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:08,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:08,553 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:08,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559932238] [2021-05-06 11:10:08,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1559932238] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:08,553 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:08,553 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:10:08,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090006422] [2021-05-06 11:10:08,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:10:08,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:08,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:10:08,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=642, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:10:08,554 INFO L87 Difference]: Start difference. First operand 826 states and 985 transitions. Second operand has 29 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 11:10:10,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:10,160 INFO L93 Difference]: Finished difference Result 1212 states and 1454 transitions. [2021-05-06 11:10:10,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:10:10,161 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 64 [2021-05-06 11:10:10,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:10,163 INFO L225 Difference]: With dead ends: 1212 [2021-05-06 11:10:10,163 INFO L226 Difference]: Without dead ends: 1040 [2021-05-06 11:10:10,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1083 ImplicationChecksByTransitivity, 1212.9ms TimeCoverageRelationStatistics Valid=671, Invalid=2635, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:10:10,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1040 states. [2021-05-06 11:10:10,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1040 to 852. [2021-05-06 11:10:10,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 852 states, 800 states have (on average 1.185) internal successors, (948), 823 states have internal predecessors, (948), 37 states have call successors, (37), 15 states have call predecessors, (37), 14 states have return successors, (35), 13 states have call predecessors, (35), 35 states have call successors, (35) [2021-05-06 11:10:10,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 852 states to 852 states and 1020 transitions. [2021-05-06 11:10:10,474 INFO L78 Accepts]: Start accepts. Automaton has 852 states and 1020 transitions. Word has length 64 [2021-05-06 11:10:10,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:10,474 INFO L480 AbstractCegarLoop]: Abstraction has 852 states and 1020 transitions. [2021-05-06 11:10:10,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 11:10:10,474 INFO L276 IsEmpty]: Start isEmpty. Operand 852 states and 1020 transitions. [2021-05-06 11:10:10,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:10:10,475 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:10,475 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:10,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:10:10,475 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:10,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:10,475 INFO L82 PathProgramCache]: Analyzing trace with hash -1148832980, now seen corresponding path program 9 times [2021-05-06 11:10:10,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:10,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518313134] [2021-05-06 11:10:10,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:10,479 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:10,479 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:10,479 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:10,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:10,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:10,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:10,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:10,796 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:10,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518313134] [2021-05-06 11:10:10,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1518313134] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:10,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:10,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:10:10,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770564594] [2021-05-06 11:10:10,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:10:10,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:10,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:10:10,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:10:10,797 INFO L87 Difference]: Start difference. First operand 852 states and 1020 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 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 11:10:11,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:11,649 INFO L93 Difference]: Finished difference Result 1174 states and 1416 transitions. [2021-05-06 11:10:11,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:10:11,650 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 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 64 [2021-05-06 11:10:11,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:11,652 INFO L225 Difference]: With dead ends: 1174 [2021-05-06 11:10:11,652 INFO L226 Difference]: Without dead ends: 939 [2021-05-06 11:10:11,653 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 419.4ms TimeCoverageRelationStatistics Valid=137, Invalid=793, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:10:11,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 939 states. [2021-05-06 11:10:11,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 939 to 880. [2021-05-06 11:10:11,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 880 states, 828 states have (on average 1.182367149758454) internal successors, (979), 851 states have internal predecessors, (979), 37 states have call successors, (37), 15 states have call predecessors, (37), 14 states have return successors, (35), 13 states have call predecessors, (35), 35 states have call successors, (35) [2021-05-06 11:10:11,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 880 states to 880 states and 1051 transitions. [2021-05-06 11:10:11,968 INFO L78 Accepts]: Start accepts. Automaton has 880 states and 1051 transitions. Word has length 64 [2021-05-06 11:10:11,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:11,969 INFO L480 AbstractCegarLoop]: Abstraction has 880 states and 1051 transitions. [2021-05-06 11:10:11,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 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 11:10:11,969 INFO L276 IsEmpty]: Start isEmpty. Operand 880 states and 1051 transitions. [2021-05-06 11:10:11,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:10:11,970 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:11,970 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:11,970 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:10:11,970 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:11,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:11,970 INFO L82 PathProgramCache]: Analyzing trace with hash -777241936, now seen corresponding path program 2 times [2021-05-06 11:10:11,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:11,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784699699] [2021-05-06 11:10:11,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:11,973 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:11,973 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:11,974 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:11,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:10:11,991 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:10:12,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:10:12,010 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:10:12,030 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-05-06 11:10:12,030 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 11:10:12,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:10:12,045 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:10:12 BoogieIcfgContainer [2021-05-06 11:10:12,046 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:10:12,046 INFO L168 Benchmark]: Toolchain (without parser) took 68195.25 ms. Allocated memory was 195.0 MB in the beginning and 457.2 MB in the end (delta: 262.1 MB). Free memory was 160.5 MB in the beginning and 279.4 MB in the end (delta: -118.9 MB). Peak memory consumption was 143.7 MB. Max. memory is 8.0 GB. [2021-05-06 11:10:12,046 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 195.0 MB. Free memory is still 176.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:10:12,046 INFO L168 Benchmark]: CACSL2BoogieTranslator took 176.74 ms. Allocated memory is still 195.0 MB. Free memory was 160.3 MB in the beginning and 150.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-05-06 11:10:12,046 INFO L168 Benchmark]: Boogie Preprocessor took 75.26 ms. Allocated memory is still 195.0 MB. Free memory was 150.3 MB in the beginning and 177.9 MB in the end (delta: -27.6 MB). Peak memory consumption was 4.4 MB. Max. memory is 8.0 GB. [2021-05-06 11:10:12,046 INFO L168 Benchmark]: RCFGBuilder took 375.01 ms. Allocated memory is still 195.0 MB. Free memory was 177.9 MB in the beginning and 161.1 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-06 11:10:12,046 INFO L168 Benchmark]: TraceAbstraction took 67564.16 ms. Allocated memory was 195.0 MB in the beginning and 457.2 MB in the end (delta: 262.1 MB). Free memory was 160.8 MB in the beginning and 279.4 MB in the end (delta: -118.6 MB). Peak memory consumption was 143.5 MB. Max. memory is 8.0 GB. [2021-05-06 11:10:12,047 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 195.0 MB. Free memory is still 176.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 176.74 ms. Allocated memory is still 195.0 MB. Free memory was 160.3 MB in the beginning and 150.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 75.26 ms. Allocated memory is still 195.0 MB. Free memory was 150.3 MB in the beginning and 177.9 MB in the end (delta: -27.6 MB). Peak memory consumption was 4.4 MB. Max. memory is 8.0 GB. * RCFGBuilder took 375.01 ms. Allocated memory is still 195.0 MB. Free memory was 177.9 MB in the beginning and 161.1 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 67564.16 ms. Allocated memory was 195.0 MB in the beginning and 457.2 MB in the end (delta: 262.1 MB). Free memory was 160.8 MB in the beginning and 279.4 MB in the end (delta: -118.6 MB). Peak memory consumption was 143.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L14] unsigned int SIZE=__VERIFIER_nondet_uint(); [L15] int i, j, k, key; [L16] int v[SIZE]; [L17] j=0 [L17] COND TRUE j=0) && (v[i]>key) [L22] EXPR v[i] [L22] (i>=0) && (v[i]>key) [L22] COND FALSE !((i>=0) && (v[i]>key)) [L27] v[i+1] = key [L19] j++ [L19] COND TRUE j=0) && (v[i]>key) [L22] EXPR v[i] [L22] (i>=0) && (v[i]>key) [L22] COND FALSE !((i>=0) && (v[i]>key)) [L27] v[i+1] = key [L19] j++ [L19] COND TRUE j=0) && (v[i]>key) [L22] EXPR v[i] [L22] (i>=0) && (v[i]>key) [L22] COND TRUE (i>=0) && (v[i]>key) [L23] COND FALSE !(i<2) [L25] i = i - 1 [L22] (i>=0) && (v[i]>key) [L22] EXPR v[i] [L22] (i>=0) && (v[i]>key) [L22] COND TRUE (i>=0) && (v[i]>key) [L23] COND TRUE i<2 [L24] EXPR v[i] [L24] v[i+1] = v[i] [L25] i = i - 1 [L22] (i>=0) && (v[i]>key) [L22] EXPR v[i] [L22] (i>=0) && (v[i]>key) [L22] COND FALSE !((i>=0) && (v[i]>key)) [L27] v[i+1] = key [L19] j++ [L19] COND FALSE !(j