/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_vector_difference_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:47:28,713 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:47:28,717 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:47:28,756 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-21 21:47:28,811 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:47:28,812 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:47:28,813 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:47:28,814 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:47:28,850 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:47:28,850 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:47:28,853 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:47:28,853 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:47:28,853 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:47:28,853 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:47:28,854 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:47:28,854 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:47:28,856 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:47:28,856 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:47:28,856 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:47:28,856 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:47:28,857 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:47:28,857 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:47:28,857 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:47:28,857 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:47:28,858 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:47:28,858 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:47:28,858 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:47:28,858 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:47:28,858 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:47:28,859 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:47:28,859 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:47:28,860 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:47:28,860 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:47:28,861 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:47:29,272 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:47:29,303 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:47:29,307 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:47:29,308 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:47:29,309 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:47:29,311 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_vector_difference_ground.i [2020-12-21 21:47:29,414 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9c33f2687/a1f072208de945e08196dbe7368c83d5/FLAG8bdba65da [2020-12-21 21:47:30,102 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:47:30,103 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_vector_difference_ground.i [2020-12-21 21:47:30,114 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9c33f2687/a1f072208de945e08196dbe7368c83d5/FLAG8bdba65da [2020-12-21 21:47:30,433 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9c33f2687/a1f072208de945e08196dbe7368c83d5 [2020-12-21 21:47:30,436 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:47:30,440 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:47:30,443 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:47:30,443 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:47:30,448 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:47:30,450 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,452 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e9caeef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30, skipping insertion in model container [2020-12-21 21:47:30,453 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,463 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:47:30,486 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:47:30,724 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_vector_difference_ground.i[826,839] [2020-12-21 21:47:30,743 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:47:30,753 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:47:30,768 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_vector_difference_ground.i[826,839] [2020-12-21 21:47:30,777 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:47:30,795 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:47:30,795 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30 WrapperNode [2020-12-21 21:47:30,795 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:47:30,797 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:47:30,797 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:47:30,797 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:47:30,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,815 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,837 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:47:30,838 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:47:30,839 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:47:30,839 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:47:30,848 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,849 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,851 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,851 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,858 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,863 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,865 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (1/1) ... [2020-12-21 21:47:30,867 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:47:30,868 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:47:30,869 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:47:30,869 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:47:30,870 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (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 [2020-12-21 21:47:30,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:47:30,985 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:47:30,985 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:47:30,985 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:47:30,985 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:47:30,986 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:47:30,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:47:31,296 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:47:31,297 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 21:47:31,299 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:47:31 BoogieIcfgContainer [2020-12-21 21:47:31,299 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:47:31,301 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:47:31,301 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:47:31,306 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:47:31,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:47:30" (1/3) ... [2020-12-21 21:47:31,307 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45a4caba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:47:31, skipping insertion in model container [2020-12-21 21:47:31,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:47:30" (2/3) ... [2020-12-21 21:47:31,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45a4caba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:47:31, skipping insertion in model container [2020-12-21 21:47:31,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:47:31" (3/3) ... [2020-12-21 21:47:31,310 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_vector_difference_ground.i [2020-12-21 21:47:31,318 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:47:31,323 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:47:31,346 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:47:31,377 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:47:31,377 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:47:31,378 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:47:31,378 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:47:31,378 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:47:31,378 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:47:31,378 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:47:31,379 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:47:31,417 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-12-21 21:47:31,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:47:31,423 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:31,424 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:31,424 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:31,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:31,433 INFO L82 PathProgramCache]: Analyzing trace with hash -2015557098, now seen corresponding path program 1 times [2020-12-21 21:47:31,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:31,445 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494476233] [2020-12-21 21:47:31,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:31,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:31,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:47:31,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494476233] [2020-12-21 21:47:31,719 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:47:31,720 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:47:31,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210283930] [2020-12-21 21:47:31,726 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:47:31,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:31,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:47:31,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:47:31,745 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-12-21 21:47:31,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:31,796 INFO L93 Difference]: Finished difference Result 33 states and 47 transitions. [2020-12-21 21:47:31,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:47:31,798 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-21 21:47:31,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:31,808 INFO L225 Difference]: With dead ends: 33 [2020-12-21 21:47:31,808 INFO L226 Difference]: Without dead ends: 16 [2020-12-21 21:47:31,817 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:47:31,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-21 21:47:31,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-12-21 21:47:31,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-21 21:47:31,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-21 21:47:31,891 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-12-21 21:47:31,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:31,892 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-21 21:47:31,892 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:47:31,892 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-21 21:47:31,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-21 21:47:31,893 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:31,893 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:31,893 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:47:31,894 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:31,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:31,895 INFO L82 PathProgramCache]: Analyzing trace with hash 1338517781, now seen corresponding path program 1 times [2020-12-21 21:47:31,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:31,895 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156339584] [2020-12-21 21:47:31,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:31,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:31,958 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:47:31,959 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156339584] [2020-12-21 21:47:31,959 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301108681] [2020-12-21 21:47:31,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:32,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:32,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:47:32,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:32,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:47:32,145 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:32,145 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:47:32,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828106359] [2020-12-21 21:47:32,147 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:47:32,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:32,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:47:32,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:47:32,149 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 5 states. [2020-12-21 21:47:32,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:32,204 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-12-21 21:47:32,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:47:32,205 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-12-21 21:47:32,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:32,206 INFO L225 Difference]: With dead ends: 29 [2020-12-21 21:47:32,206 INFO L226 Difference]: Without dead ends: 19 [2020-12-21 21:47:32,207 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:47:32,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-21 21:47:32,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-12-21 21:47:32,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 21:47:32,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-21 21:47:32,212 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2020-12-21 21:47:32,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:32,212 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-21 21:47:32,213 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:47:32,213 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-21 21:47:32,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:47:32,213 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:32,214 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:32,424 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:47:32,425 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:32,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:32,427 INFO L82 PathProgramCache]: Analyzing trace with hash 231525810, now seen corresponding path program 2 times [2020-12-21 21:47:32,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:32,428 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590499104] [2020-12-21 21:47:32,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:32,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:32,584 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:47:32,585 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590499104] [2020-12-21 21:47:32,585 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796285941] [2020-12-21 21:47:32,585 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:32,755 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:47:32,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:32,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:47:32,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:32,834 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:47:32,835 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:32,835 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:47:32,835 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387802105] [2020-12-21 21:47:32,836 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:47:32,836 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:32,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:47:32,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:47:32,838 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 6 states. [2020-12-21 21:47:32,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:32,904 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2020-12-21 21:47:32,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:47:32,905 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-12-21 21:47:32,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:32,906 INFO L225 Difference]: With dead ends: 33 [2020-12-21 21:47:32,907 INFO L226 Difference]: Without dead ends: 22 [2020-12-21 21:47:32,907 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:47:32,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-21 21:47:32,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-12-21 21:47:32,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-21 21:47:32,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-21 21:47:32,913 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2020-12-21 21:47:32,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:32,914 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-21 21:47:32,914 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:47:32,914 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-21 21:47:32,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-21 21:47:32,915 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:32,915 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:33,128 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:33,129 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:33,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:33,131 INFO L82 PathProgramCache]: Analyzing trace with hash 527921017, now seen corresponding path program 3 times [2020-12-21 21:47:33,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:33,132 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420138095] [2020-12-21 21:47:33,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:33,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:33,264 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:47:33,265 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420138095] [2020-12-21 21:47:33,265 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465855771] [2020-12-21 21:47:33,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:33,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:47:33,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:33,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:47:33,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:33,505 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-21 21:47:33,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:33,506 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:47:33,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983168296] [2020-12-21 21:47:33,507 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:47:33,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:33,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:47:33,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:47:33,508 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2020-12-21 21:47:33,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:33,580 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2020-12-21 21:47:33,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:47:33,581 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-12-21 21:47:33,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:33,582 INFO L225 Difference]: With dead ends: 37 [2020-12-21 21:47:33,582 INFO L226 Difference]: Without dead ends: 25 [2020-12-21 21:47:33,583 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:47:33,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-21 21:47:33,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-12-21 21:47:33,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:47:33,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-21 21:47:33,589 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 18 [2020-12-21 21:47:33,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:33,589 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-21 21:47:33,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:47:33,589 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-21 21:47:33,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:47:33,590 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:33,590 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:33,793 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:33,794 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:33,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:33,796 INFO L82 PathProgramCache]: Analyzing trace with hash -150327986, now seen corresponding path program 4 times [2020-12-21 21:47:33,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:33,797 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750779016] [2020-12-21 21:47:33,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:33,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:33,996 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:47:33,997 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750779016] [2020-12-21 21:47:33,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059851139] [2020-12-21 21:47:33,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:34,097 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:47:34,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:34,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:47:34,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:34,164 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:47:34,165 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:34,165 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:47:34,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863349502] [2020-12-21 21:47:34,166 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:47:34,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:34,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:47:34,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:47:34,167 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-12-21 21:47:34,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:34,246 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2020-12-21 21:47:34,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:47:34,247 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-12-21 21:47:34,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:34,248 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:47:34,248 INFO L226 Difference]: Without dead ends: 28 [2020-12-21 21:47:34,249 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:47:34,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-21 21:47:34,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-12-21 21:47:34,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-21 21:47:34,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-21 21:47:34,255 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 21 [2020-12-21 21:47:34,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:34,255 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-21 21:47:34,255 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:47:34,255 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-21 21:47:34,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-21 21:47:34,256 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:34,256 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:34,470 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:34,471 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:34,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:34,473 INFO L82 PathProgramCache]: Analyzing trace with hash 2061613533, now seen corresponding path program 5 times [2020-12-21 21:47:34,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:34,474 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275489156] [2020-12-21 21:47:34,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:34,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:34,602 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-21 21:47:34,603 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275489156] [2020-12-21 21:47:34,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052074706] [2020-12-21 21:47:34,604 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:34,931 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 21:47:34,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:34,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:47:34,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:35,032 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-21 21:47:35,033 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:35,033 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:47:35,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39985023] [2020-12-21 21:47:35,034 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:47:35,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:35,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:47:35,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:47:35,035 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 9 states. [2020-12-21 21:47:35,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:35,133 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-12-21 21:47:35,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:47:35,134 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-12-21 21:47:35,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:35,135 INFO L225 Difference]: With dead ends: 45 [2020-12-21 21:47:35,135 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:47:35,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:47:35,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:47:35,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-12-21 21:47:35,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-21 21:47:35,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-21 21:47:35,142 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 24 [2020-12-21 21:47:35,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:35,142 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-21 21:47:35,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:47:35,143 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-21 21:47:35,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:47:35,143 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:35,144 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:35,357 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:47:35,358 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:35,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:35,359 INFO L82 PathProgramCache]: Analyzing trace with hash -654055190, now seen corresponding path program 6 times [2020-12-21 21:47:35,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:35,360 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974491889] [2020-12-21 21:47:35,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:35,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:35,488 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-21 21:47:35,488 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974491889] [2020-12-21 21:47:35,488 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344736723] [2020-12-21 21:47:35,489 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:35,853 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:47:35,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:35,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:47:35,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:35,913 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:47:35,913 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:35,914 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:47:35,914 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728067163] [2020-12-21 21:47:35,914 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:47:35,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:35,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:47:35,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:47:35,916 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 10 states. [2020-12-21 21:47:35,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:35,983 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2020-12-21 21:47:35,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:47:35,985 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-12-21 21:47:35,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:35,985 INFO L225 Difference]: With dead ends: 49 [2020-12-21 21:47:35,985 INFO L226 Difference]: Without dead ends: 34 [2020-12-21 21:47:35,986 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:47:35,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-21 21:47:35,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-12-21 21:47:35,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-21 21:47:35,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-12-21 21:47:35,992 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2020-12-21 21:47:35,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:35,992 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-12-21 21:47:35,992 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:47:35,992 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-12-21 21:47:35,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-21 21:47:35,993 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:35,993 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:36,199 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:36,200 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:36,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:36,202 INFO L82 PathProgramCache]: Analyzing trace with hash 773343297, now seen corresponding path program 7 times [2020-12-21 21:47:36,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:36,202 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120328491] [2020-12-21 21:47:36,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:36,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:36,370 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:47:36,370 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120328491] [2020-12-21 21:47:36,371 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351527249] [2020-12-21 21:47:36,371 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:36,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:36,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:47:36,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:36,551 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:47:36,553 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:36,554 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:47:36,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847998180] [2020-12-21 21:47:36,554 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:47:36,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:36,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:47:36,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:47:36,557 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 11 states. [2020-12-21 21:47:36,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:36,636 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2020-12-21 21:47:36,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:47:36,637 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-12-21 21:47:36,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:36,641 INFO L225 Difference]: With dead ends: 53 [2020-12-21 21:47:36,642 INFO L226 Difference]: Without dead ends: 37 [2020-12-21 21:47:36,642 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:47:36,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-21 21:47:36,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-12-21 21:47:36,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:47:36,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-21 21:47:36,653 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 30 [2020-12-21 21:47:36,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:36,654 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-21 21:47:36,654 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:47:36,654 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-21 21:47:36,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:47:36,655 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:36,655 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:36,858 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:36,859 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:36,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:36,860 INFO L82 PathProgramCache]: Analyzing trace with hash 891863174, now seen corresponding path program 8 times [2020-12-21 21:47:36,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:36,861 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804501213] [2020-12-21 21:47:36,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:36,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:37,010 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:47:37,011 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804501213] [2020-12-21 21:47:37,011 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904889483] [2020-12-21 21:47:37,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:37,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:47:37,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:37,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:47:37,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:37,141 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:47:37,142 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:37,142 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:47:37,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124392724] [2020-12-21 21:47:37,143 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:47:37,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:37,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:47:37,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:47:37,144 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 12 states. [2020-12-21 21:47:37,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:37,222 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2020-12-21 21:47:37,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:47:37,223 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-12-21 21:47:37,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:37,226 INFO L225 Difference]: With dead ends: 57 [2020-12-21 21:47:37,227 INFO L226 Difference]: Without dead ends: 40 [2020-12-21 21:47:37,227 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:47:37,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-21 21:47:37,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-12-21 21:47:37,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-21 21:47:37,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-12-21 21:47:37,243 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 33 [2020-12-21 21:47:37,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:37,246 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-12-21 21:47:37,246 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:47:37,246 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-12-21 21:47:37,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-21 21:47:37,248 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:37,248 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:37,461 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:47:37,462 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:37,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:37,463 INFO L82 PathProgramCache]: Analyzing trace with hash 992762533, now seen corresponding path program 9 times [2020-12-21 21:47:37,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:37,464 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288194387] [2020-12-21 21:47:37,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:37,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:37,603 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:47:37,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288194387] [2020-12-21 21:47:37,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857041932] [2020-12-21 21:47:37,604 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:37,916 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:47:37,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:37,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:47:37,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:38,003 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:47:38,004 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:38,004 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:47:38,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875115554] [2020-12-21 21:47:38,005 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:47:38,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:38,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:47:38,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:47:38,006 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 13 states. [2020-12-21 21:47:38,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:38,081 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2020-12-21 21:47:38,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:47:38,081 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-12-21 21:47:38,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:38,082 INFO L225 Difference]: With dead ends: 61 [2020-12-21 21:47:38,082 INFO L226 Difference]: Without dead ends: 43 [2020-12-21 21:47:38,083 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:47:38,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-21 21:47:38,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-12-21 21:47:38,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:47:38,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-12-21 21:47:38,088 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 36 [2020-12-21 21:47:38,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:38,088 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-12-21 21:47:38,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:47:38,089 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-12-21 21:47:38,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:47:38,090 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:38,090 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:38,303 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:38,304 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:38,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:38,305 INFO L82 PathProgramCache]: Analyzing trace with hash 887583778, now seen corresponding path program 10 times [2020-12-21 21:47:38,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:38,306 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502006780] [2020-12-21 21:47:38,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:38,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:38,443 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-21 21:47:38,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502006780] [2020-12-21 21:47:38,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991479503] [2020-12-21 21:47:38,444 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:38,522 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:47:38,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:47:38,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:47:38,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:47:38,585 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-21 21:47:38,585 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:47:38,585 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:47:38,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64713752] [2020-12-21 21:47:38,586 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:47:38,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:47:38,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:47:38,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:47:38,587 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 14 states. [2020-12-21 21:47:38,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:47:38,677 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2020-12-21 21:47:38,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:47:38,678 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-12-21 21:47:38,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:47:38,679 INFO L225 Difference]: With dead ends: 65 [2020-12-21 21:47:38,679 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 21:47:38,680 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:47:38,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 21:47:38,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-12-21 21:47:38,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-21 21:47:38,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2020-12-21 21:47:38,685 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 39 [2020-12-21 21:47:38,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:47:38,685 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2020-12-21 21:47:38,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:47:38,685 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2020-12-21 21:47:38,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-21 21:47:38,686 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:47:38,686 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:47:38,888 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:47:38,889 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:47:38,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:47:38,890 INFO L82 PathProgramCache]: Analyzing trace with hash 506409225, now seen corresponding path program 11 times [2020-12-21 21:47:38,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:47:38,891 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580333042] [2020-12-21 21:47:38,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:47:38,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:47:39,070 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-21 21:47:39,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580333042] [2020-12-21 21:47:39,071 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986760696] [2020-12-21 21:47:39,071 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:48:00,156 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 21:48:00,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:48:00,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:48:00,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:48:00,255 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-21 21:48:00,255 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:48:00,255 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:48:00,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394419602] [2020-12-21 21:48:00,256 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:48:00,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:48:00,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:48:00,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:48:00,257 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 15 states. [2020-12-21 21:48:00,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:48:00,344 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2020-12-21 21:48:00,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:48:00,345 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-12-21 21:48:00,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:48:00,348 INFO L225 Difference]: With dead ends: 69 [2020-12-21 21:48:00,348 INFO L226 Difference]: Without dead ends: 49 [2020-12-21 21:48:00,348 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:48:00,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-12-21 21:48:00,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2020-12-21 21:48:00,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 21:48:00,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-12-21 21:48:00,359 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 42 [2020-12-21 21:48:00,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:48:00,359 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-12-21 21:48:00,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:48:00,359 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-12-21 21:48:00,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:48:00,360 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:48:00,360 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:48:00,574 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:48:00,575 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:48:00,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:48:00,576 INFO L82 PathProgramCache]: Analyzing trace with hash 1705952190, now seen corresponding path program 12 times [2020-12-21 21:48:00,576 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:48:00,577 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698594671] [2020-12-21 21:48:00,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:48:00,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:48:00,743 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:48:00,743 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698594671] [2020-12-21 21:48:00,743 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568613400] [2020-12-21 21:48:00,743 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:48:06,906 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:48:06,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:48:06,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 29 conjunts are in the unsatisfiable core [2020-12-21 21:48:06,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:48:07,063 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 23 proven. 78 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:48:07,064 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:48:07,064 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17] total 18 [2020-12-21 21:48:07,064 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954508983] [2020-12-21 21:48:07,065 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:48:07,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:48:07,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:48:07,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:48:07,066 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 18 states. [2020-12-21 21:48:07,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:48:07,188 INFO L93 Difference]: Finished difference Result 75 states and 82 transitions. [2020-12-21 21:48:07,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:48:07,188 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 45 [2020-12-21 21:48:07,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:48:07,189 INFO L225 Difference]: With dead ends: 75 [2020-12-21 21:48:07,189 INFO L226 Difference]: Without dead ends: 54 [2020-12-21 21:48:07,190 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:48:07,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-21 21:48:07,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-12-21 21:48:07,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-21 21:48:07,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-12-21 21:48:07,203 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 45 [2020-12-21 21:48:07,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:48:07,203 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-12-21 21:48:07,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:48:07,204 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-12-21 21:48:07,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-21 21:48:07,205 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:48:07,205 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:48:07,420 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:48:07,421 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:48:07,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:48:07,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1961717594, now seen corresponding path program 13 times [2020-12-21 21:48:07,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:48:07,423 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745413981] [2020-12-21 21:48:07,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:48:07,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:48:07,626 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-21 21:48:07,626 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745413981] [2020-12-21 21:48:07,627 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962482171] [2020-12-21 21:48:07,627 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:48:07,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:48:07,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:48:07,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:48:07,788 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-21 21:48:07,788 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:48:07,788 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:48:07,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099569925] [2020-12-21 21:48:07,789 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:48:07,789 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:48:07,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:48:07,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:48:07,790 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 18 states. [2020-12-21 21:48:07,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:48:07,902 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2020-12-21 21:48:07,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:48:07,902 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-12-21 21:48:07,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:48:07,903 INFO L225 Difference]: With dead ends: 81 [2020-12-21 21:48:07,903 INFO L226 Difference]: Without dead ends: 58 [2020-12-21 21:48:07,904 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:48:07,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-21 21:48:07,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-12-21 21:48:07,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-21 21:48:07,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-12-21 21:48:07,909 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 51 [2020-12-21 21:48:07,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:48:07,909 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-12-21 21:48:07,910 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:48:07,910 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-12-21 21:48:07,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-12-21 21:48:07,911 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:48:07,911 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:48:08,124 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:48:08,125 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:48:08,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:48:08,126 INFO L82 PathProgramCache]: Analyzing trace with hash 1346775505, now seen corresponding path program 14 times [2020-12-21 21:48:08,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:48:08,127 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368842619] [2020-12-21 21:48:08,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:48:08,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:48:08,363 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-21 21:48:08,364 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368842619] [2020-12-21 21:48:08,364 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070635366] [2020-12-21 21:48:08,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:48:08,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:48:08,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:48:08,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:48:08,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:48:08,521 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-21 21:48:08,522 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:48:08,522 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:48:08,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255706820] [2020-12-21 21:48:08,522 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:48:08,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:48:08,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:48:08,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:48:08,524 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 19 states. [2020-12-21 21:48:08,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:48:08,634 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2020-12-21 21:48:08,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:48:08,635 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-12-21 21:48:08,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:48:08,635 INFO L225 Difference]: With dead ends: 85 [2020-12-21 21:48:08,635 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 21:48:08,636 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:48:08,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 21:48:08,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2020-12-21 21:48:08,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:48:08,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-21 21:48:08,641 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 54 [2020-12-21 21:48:08,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:48:08,642 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-21 21:48:08,642 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:48:08,642 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-21 21:48:08,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:48:08,642 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:48:08,643 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:48:08,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:48:08,857 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:48:08,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:48:08,858 INFO L82 PathProgramCache]: Analyzing trace with hash -334350602, now seen corresponding path program 15 times [2020-12-21 21:48:08,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:48:08,859 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237524812] [2020-12-21 21:48:08,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:48:08,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:48:09,142 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-21 21:48:09,142 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237524812] [2020-12-21 21:48:09,144 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006865337] [2020-12-21 21:48:09,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:48:12,332 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:48:12,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:48:12,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:48:12,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:48:12,431 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-21 21:48:12,432 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:48:12,432 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:48:12,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064262409] [2020-12-21 21:48:12,432 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:48:12,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:48:12,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:48:12,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:48:12,435 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 20 states. [2020-12-21 21:48:12,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:48:12,532 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2020-12-21 21:48:12,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:48:12,533 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-12-21 21:48:12,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:48:12,534 INFO L225 Difference]: With dead ends: 89 [2020-12-21 21:48:12,534 INFO L226 Difference]: Without dead ends: 64 [2020-12-21 21:48:12,535 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:48:12,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-21 21:48:12,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-12-21 21:48:12,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-12-21 21:48:12,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2020-12-21 21:48:12,540 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 57 [2020-12-21 21:48:12,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:48:12,540 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2020-12-21 21:48:12,540 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:48:12,540 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2020-12-21 21:48:12,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-21 21:48:12,541 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:48:12,541 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:48:12,754 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:48:12,755 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:48:12,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:48:12,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1568459829, now seen corresponding path program 16 times [2020-12-21 21:48:12,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:48:12,757 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881175076] [2020-12-21 21:48:12,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:48:12,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:48:13,027 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-21 21:48:13,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881175076] [2020-12-21 21:48:13,028 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997839156] [2020-12-21 21:48:13,028 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:48:13,112 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:48:13,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:48:13,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:48:13,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:48:13,252 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-21 21:48:13,253 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:48:13,253 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 21:48:13,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366347943] [2020-12-21 21:48:13,254 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:48:13,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:48:13,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:48:13,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:48:13,258 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 21 states. [2020-12-21 21:48:13,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:48:13,381 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2020-12-21 21:48:13,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:48:13,381 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-12-21 21:48:13,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:48:13,382 INFO L225 Difference]: With dead ends: 93 [2020-12-21 21:48:13,382 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:48:13,383 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:48:13,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:48:13,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2020-12-21 21:48:13,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:48:13,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-12-21 21:48:13,391 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 60 [2020-12-21 21:48:13,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:48:13,395 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-12-21 21:48:13,395 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:48:13,396 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-12-21 21:48:13,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-21 21:48:13,396 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:48:13,396 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:48:13,612 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:48:13,613 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:48:13,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:48:13,614 INFO L82 PathProgramCache]: Analyzing trace with hash -326378862, now seen corresponding path program 17 times [2020-12-21 21:48:13,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:48:13,615 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633404225] [2020-12-21 21:48:13,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:48:13,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:48:13,900 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-21 21:48:13,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633404225] [2020-12-21 21:48:13,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287685012] [2020-12-21 21:48:13,900 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true