/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 18:53:09,568 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 18:53:09,571 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 18:53:09,604 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 18:53:09,633 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 18:53:09,636 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 18:53:09,639 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 18:53:09,641 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 18:53:09,643 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 18:53:09,644 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 18:53:09,647 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 18:53:09,654 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 18:53:09,655 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 18:53:09,657 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 18:53:09,658 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 18:53:09,659 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 18:53:09,664 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 18:53:09,677 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 18:53:09,678 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 18:53:09,679 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 18:53:09,680 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 18:53:09,697 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 18:53:09,697 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 18:53:09,700 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 18:53:09,700 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 18:53:09,701 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 18:53:09,701 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 18:53:09,701 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 18:53:09,701 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 18:53:09,702 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 18:53:09,702 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 18:53:09,703 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 18:53:09,703 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 18:53:09,703 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 18:53:09,704 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 18:53:09,704 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 18:53:09,704 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 18:53:09,705 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 18:53:09,705 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 18:53:09,705 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 18:53:09,705 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 18:53:09,706 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 18:53:09,706 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 18:53:09,706 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 18:53:10,034 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 18:53:10,047 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 18:53:10,053 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 18:53:10,054 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 18:53:10,055 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 18:53:10,056 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-08-22 18:53:10,134 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fac6bf05/65d24ea66e904e8e9be0f310d2d2907a/FLAG4145653cd [2020-08-22 18:53:10,645 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 18:53:10,645 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-08-22 18:53:10,652 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fac6bf05/65d24ea66e904e8e9be0f310d2d2907a/FLAG4145653cd [2020-08-22 18:53:11,002 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fac6bf05/65d24ea66e904e8e9be0f310d2d2907a [2020-08-22 18:53:11,013 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 18:53:11,016 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 18:53:11,017 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 18:53:11,017 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 18:53:11,021 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 18:53:11,022 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,026 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@aae2125 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11, skipping insertion in model container [2020-08-22 18:53:11,026 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,034 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 18:53:11,052 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 18:53:11,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:53:11,237 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 18:53:11,253 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:53:11,269 INFO L208 MainTranslator]: Completed translation [2020-08-22 18:53:11,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11 WrapperNode [2020-08-22 18:53:11,270 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 18:53:11,270 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 18:53:11,271 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 18:53:11,271 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 18:53:11,283 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,284 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,288 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,288 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,291 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,294 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,294 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (1/1) ... [2020-08-22 18:53:11,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 18:53:11,296 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 18:53:11,296 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 18:53:11,297 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 18:53:11,298 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (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 [2020-08-22 18:53:11,454 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 18:53:11,454 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 18:53:11,454 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-22 18:53:11,454 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 18:53:11,454 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 18:53:11,455 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 18:53:11,455 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-22 18:53:11,455 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 18:53:11,455 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 18:53:11,455 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 18:53:11,621 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 18:53:11,621 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 18:53:11,625 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:53:11 BoogieIcfgContainer [2020-08-22 18:53:11,625 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 18:53:11,626 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 18:53:11,627 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 18:53:11,630 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 18:53:11,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:53:11" (1/3) ... [2020-08-22 18:53:11,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6985d565 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:53:11, skipping insertion in model container [2020-08-22 18:53:11,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:53:11" (2/3) ... [2020-08-22 18:53:11,632 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6985d565 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:53:11, skipping insertion in model container [2020-08-22 18:53:11,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:53:11" (3/3) ... [2020-08-22 18:53:11,634 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i5_o5-1.c [2020-08-22 18:53:11,645 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 18:53:11,653 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 18:53:11,667 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 18:53:11,691 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 18:53:11,691 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 18:53:11,691 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 18:53:11,692 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 18:53:11,692 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 18:53:11,692 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 18:53:11,692 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 18:53:11,692 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 18:53:11,708 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-22 18:53:11,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 18:53:11,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:53:11,721 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 18:53:11,722 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:53:11,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:53:11,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1037734449, now seen corresponding path program 1 times [2020-08-22 18:53:11,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:53:11,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2099210019] [2020-08-22 18:53:11,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:53:11,794 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 18:53:11,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:53:11,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 18:53:11,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:53:11,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 18:53:11,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:53:11,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 18:53:11,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2099210019] [2020-08-22 18:53:11,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 18:53:11,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 18:53:11,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237111147] [2020-08-22 18:53:11,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 18:53:11,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 18:53:11,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 18:53:11,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 18:53:11,999 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2020-08-22 18:53:12,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 18:53:12,101 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-22 18:53:12,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 18:53:12,103 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-22 18:53:12,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 18:53:12,117 INFO L225 Difference]: With dead ends: 37 [2020-08-22 18:53:12,117 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 18:53:12,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 18:53:12,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 18:53:12,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 18:53:12,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 18:53:12,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-22 18:53:12,181 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 16 [2020-08-22 18:53:12,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 18:53:12,182 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-22 18:53:12,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 18:53:12,182 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-22 18:53:12,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 18:53:12,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:53:12,185 INFO L422 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] [2020-08-22 18:53:12,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 18:53:12,186 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:53:12,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:53:12,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1478812441, now seen corresponding path program 1 times [2020-08-22 18:53:12,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:53:12,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851703761] [2020-08-22 18:53:12,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY