/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:01:30,739 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:01:30,743 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:01:30,801 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-06 22:01:30,830 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:01:30,834 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:01:30,836 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:01:30,838 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:01:30,839 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:01:30,842 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:01:30,849 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:01:30,857 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:01:30,859 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:01:30,860 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:01:30,862 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:01:30,865 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:01:30,875 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:01:30,887 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:01:30,887 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:01:30,888 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:01:30,890 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-06 22:01:30,951 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:01:30,951 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:01:30,956 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:01:30,956 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:01:30,956 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:01:30,957 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:01:30,957 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:01:30,957 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:01:30,957 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:01:30,958 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:01:30,959 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:01:30,959 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:01:30,959 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:01:30,960 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:01:30,960 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:01:30,960 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:01:30,960 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:01:30,961 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:01:30,961 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:01:30,961 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:01:30,961 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:01:30,962 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:01:30,962 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:01:30,962 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:01:30,962 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:01:30,962 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:01:30,963 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:01:30,963 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:01:30,963 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:01:30,963 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:01:31,341 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:01:31,366 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:01:31,369 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:01:31,371 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:01:31,371 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:01:31,372 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-11-06 22:01:31,464 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/857bcc2f3/315d2cac7d4c4c3b97aaaf1913344366/FLAG36129d558 [2020-11-06 22:01:32,048 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:01:32,049 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-11-06 22:01:32,057 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/857bcc2f3/315d2cac7d4c4c3b97aaaf1913344366/FLAG36129d558 [2020-11-06 22:01:32,421 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/857bcc2f3/315d2cac7d4c4c3b97aaaf1913344366 [2020-11-06 22:01:32,424 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:01:32,432 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:01:32,434 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:01:32,434 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:01:32,438 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:01:32,439 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,443 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53660c54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32, skipping insertion in model container [2020-11-06 22:01:32,443 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,452 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:01:32,467 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:01:32,625 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:01:32,636 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:01:32,655 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:01:32,673 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:01:32,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32 WrapperNode [2020-11-06 22:01:32,674 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:01:32,676 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:01:32,676 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:01:32,676 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:01:32,690 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,690 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,698 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,705 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,707 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,708 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (1/1) ... [2020-11-06 22:01:32,710 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:01:32,711 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:01:32,712 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:01:32,712 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:01:32,713 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (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 [2020-11-06 22:01:32,805 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:01:32,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:01:32,806 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:01:32,807 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-11-06 22:01:32,807 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:01:32,808 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:01:32,808 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:01:32,808 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:01:32,808 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:01:32,809 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-06 22:01:32,809 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-11-06 22:01:32,810 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:01:32,810 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:01:32,811 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:01:32,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:01:32,812 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:01:32,812 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:01:32,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:01:33,348 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:01:33,348 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-06 22:01:33,350 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:01:33 BoogieIcfgContainer [2020-11-06 22:01:33,350 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:01:33,353 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:01:33,353 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:01:33,357 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:01:33,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:01:32" (1/3) ... [2020-11-06 22:01:33,359 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@136614dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:01:33, skipping insertion in model container [2020-11-06 22:01:33,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:01:32" (2/3) ... [2020-11-06 22:01:33,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@136614dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:01:33, skipping insertion in model container [2020-11-06 22:01:33,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:01:33" (3/3) ... [2020-11-06 22:01:33,361 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-11-06 22:01:33,380 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:01:33,383 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:01:33,421 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:01:33,463 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:01:33,464 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:01:33,464 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:01:33,464 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:01:33,464 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:01:33,465 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:01:33,465 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:01:33,465 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:01:33,491 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-11-06 22:01:33,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-06 22:01:33,500 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:33,501 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:33,502 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:33,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:33,512 INFO L82 PathProgramCache]: Analyzing trace with hash 2107265492, now seen corresponding path program 1 times [2020-11-06 22:01:33,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:33,531 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738231920] [2020-11-06 22:01:33,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:33,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:33,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:01:33,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:33,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:01:33,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:33,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:01:33,940 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738231920] [2020-11-06 22:01:33,941 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:01:33,941 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:01:33,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793857044] [2020-11-06 22:01:33,948 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:01:33,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:01:33,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:01:33,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:01:33,966 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-11-06 22:01:34,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:01:34,268 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2020-11-06 22:01:34,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:01:34,270 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-11-06 22:01:34,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:01:34,291 INFO L225 Difference]: With dead ends: 41 [2020-11-06 22:01:34,291 INFO L226 Difference]: Without dead ends: 23 [2020-11-06 22:01:34,301 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:01:34,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-06 22:01:34,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-11-06 22:01:34,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-06 22:01:34,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-11-06 22:01:34,346 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2020-11-06 22:01:34,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:01:34,347 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-11-06 22:01:34,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:01:34,347 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-11-06 22:01:34,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-06 22:01:34,349 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:34,349 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:34,349 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:01:34,350 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:34,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:34,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1001048603, now seen corresponding path program 1 times [2020-11-06 22:01:34,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:34,351 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520905543] [2020-11-06 22:01:34,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:34,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:34,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:01:34,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:34,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:01:34,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:34,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:01:34,466 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520905543] [2020-11-06 22:01:34,467 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:01:34,467 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:01:34,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130751689] [2020-11-06 22:01:34,469 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:01:34,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:01:34,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:01:34,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:01:34,471 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-11-06 22:01:34,749 WARN L194 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-11-06 22:01:34,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:01:34,815 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-11-06 22:01:34,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:01:34,816 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-11-06 22:01:34,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:01:34,818 INFO L225 Difference]: With dead ends: 30 [2020-11-06 22:01:34,818 INFO L226 Difference]: Without dead ends: 25 [2020-11-06 22:01:34,820 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:01:34,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-06 22:01:34,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-11-06 22:01:34,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-06 22:01:34,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-11-06 22:01:34,832 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2020-11-06 22:01:34,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:01:34,833 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-11-06 22:01:34,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:01:34,833 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-11-06 22:01:34,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-06 22:01:34,835 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:34,835 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:34,836 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:01:34,836 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:34,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:34,837 INFO L82 PathProgramCache]: Analyzing trace with hash -768223736, now seen corresponding path program 1 times [2020-11-06 22:01:34,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:34,837 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752756781] [2020-11-06 22:01:34,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:34,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:34,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:01:34,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:34,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:01:34,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:35,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-11-06 22:01:35,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,078 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-06 22:01:35,079 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752756781] [2020-11-06 22:01:35,079 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758041781] [2020-11-06 22:01:35,080 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 [2020-11-06 22:01:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:01:35,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:01:35,299 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-06 22:01:35,300 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:01:35,300 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2020-11-06 22:01:35,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056770915] [2020-11-06 22:01:35,301 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-06 22:01:35,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:01:35,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-06 22:01:35,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:01:35,303 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 10 states. [2020-11-06 22:01:35,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:01:35,630 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-11-06 22:01:35,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-06 22:01:35,630 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-11-06 22:01:35,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:01:35,632 INFO L225 Difference]: With dead ends: 41 [2020-11-06 22:01:35,632 INFO L226 Difference]: Without dead ends: 25 [2020-11-06 22:01:35,633 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:01:35,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-06 22:01:35,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-11-06 22:01:35,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-11-06 22:01:35,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-11-06 22:01:35,641 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 28 [2020-11-06 22:01:35,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:01:35,642 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-11-06 22:01:35,642 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-06 22:01:35,642 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-11-06 22:01:35,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:01:35,643 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:35,643 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:35,857 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-06 22:01:35,859 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:35,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:35,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1973821333, now seen corresponding path program 1 times [2020-11-06 22:01:35,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:35,861 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279263757] [2020-11-06 22:01:35,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:35,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:01:35,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:01:35,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:35,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:35,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:35,998 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:01:35,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279263757] [2020-11-06 22:01:35,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950289764] [2020-11-06 22:01:35,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-11-06 22:01:36,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:01:36,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:01:36,120 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:01:36,121 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:01:36,121 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-11-06 22:01:36,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599975425] [2020-11-06 22:01:36,122 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-06 22:01:36,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:01:36,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-06 22:01:36,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-11-06 22:01:36,123 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 8 states. [2020-11-06 22:01:36,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:01:36,483 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2020-11-06 22:01:36,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-06 22:01:36,484 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-11-06 22:01:36,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:01:36,486 INFO L225 Difference]: With dead ends: 44 [2020-11-06 22:01:36,486 INFO L226 Difference]: Without dead ends: 39 [2020-11-06 22:01:36,487 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:01:36,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-06 22:01:36,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-11-06 22:01:36,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-11-06 22:01:36,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 53 transitions. [2020-11-06 22:01:36,499 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 53 transitions. Word has length 29 [2020-11-06 22:01:36,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:01:36,500 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 53 transitions. [2020-11-06 22:01:36,500 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-06 22:01:36,500 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 53 transitions. [2020-11-06 22:01:36,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-11-06 22:01:36,502 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:36,502 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:36,717 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:01:36,718 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:36,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:36,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1902544615, now seen corresponding path program 2 times [2020-11-06 22:01:36,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:36,720 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300557997] [2020-11-06 22:01:36,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:36,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:01:36,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:01:36,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:36,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:36,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:36,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:01:36,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:36,882 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-11-06 22:01:36,882 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300557997] [2020-11-06 22:01:36,883 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738603258] [2020-11-06 22:01:36,883 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 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 [2020-11-06 22:01:36,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:01:36,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:01:36,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:01:36,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:01:37,078 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-06 22:01:37,081 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:01:37,082 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-11-06 22:01:37,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014744675] [2020-11-06 22:01:37,083 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-06 22:01:37,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:01:37,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-06 22:01:37,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:01:37,084 INFO L87 Difference]: Start difference. First operand 39 states and 53 transitions. Second operand 13 states. [2020-11-06 22:01:38,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:01:38,100 INFO L93 Difference]: Finished difference Result 74 states and 109 transitions. [2020-11-06 22:01:38,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-06 22:01:38,101 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 42 [2020-11-06 22:01:38,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:01:38,103 INFO L225 Difference]: With dead ends: 74 [2020-11-06 22:01:38,103 INFO L226 Difference]: Without dead ends: 40 [2020-11-06 22:01:38,105 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=143, Invalid=457, Unknown=0, NotChecked=0, Total=600 [2020-11-06 22:01:38,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-11-06 22:01:38,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-11-06 22:01:38,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-11-06 22:01:38,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-11-06 22:01:38,115 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 42 [2020-11-06 22:01:38,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:01:38,115 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-11-06 22:01:38,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-06 22:01:38,116 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-11-06 22:01:38,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-11-06 22:01:38,118 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:38,119 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:38,331 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:01:38,332 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:38,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:38,333 INFO L82 PathProgramCache]: Analyzing trace with hash -234474472, now seen corresponding path program 3 times [2020-11-06 22:01:38,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:38,334 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768559398] [2020-11-06 22:01:38,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:38,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:01:38,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:01:38,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:38,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:38,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:38,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:38,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:01:38,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:01:38,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:38,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:38,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:38,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:01:38,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:38,651 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-11-06 22:01:38,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768559398] [2020-11-06 22:01:38,652 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236870707] [2020-11-06 22:01:38,652 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 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 [2020-11-06 22:01:38,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-11-06 22:01:38,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:01:38,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:01:38,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:01:38,809 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 41 proven. 82 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-11-06 22:01:38,809 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:01:38,809 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2020-11-06 22:01:38,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29067394] [2020-11-06 22:01:38,813 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-06 22:01:38,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:01:38,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-06 22:01:38,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:01:38,816 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 10 states. [2020-11-06 22:01:39,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:01:39,304 INFO L93 Difference]: Finished difference Result 83 states and 114 transitions. [2020-11-06 22:01:39,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:01:39,304 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 84 [2020-11-06 22:01:39,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:01:39,308 INFO L225 Difference]: With dead ends: 83 [2020-11-06 22:01:39,308 INFO L226 Difference]: Without dead ends: 78 [2020-11-06 22:01:39,309 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-11-06 22:01:39,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-11-06 22:01:39,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2020-11-06 22:01:39,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-11-06 22:01:39,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 100 transitions. [2020-11-06 22:01:39,331 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 100 transitions. Word has length 84 [2020-11-06 22:01:39,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:01:39,331 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 100 transitions. [2020-11-06 22:01:39,331 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-06 22:01:39,332 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 100 transitions. [2020-11-06 22:01:39,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2020-11-06 22:01:39,338 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:39,338 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:39,546 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:01:39,547 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:39,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:39,548 INFO L82 PathProgramCache]: Analyzing trace with hash 704043195, now seen corresponding path program 4 times [2020-11-06 22:01:39,548 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:39,549 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325955725] [2020-11-06 22:01:39,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:39,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:01:39,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:01:39,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:39,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:01:39,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:01:39,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:39,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-11-06 22:01:39,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:39,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:39,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:01:39,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:01:39,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:39,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:01:40,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:40,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:01:40,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:40,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-11-06 22:01:40,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:01:40,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 363 proven. 123 refuted. 0 times theorem prover too weak. 670 trivial. 0 not checked. [2020-11-06 22:01:40,072 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325955725] [2020-11-06 22:01:40,072 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104579291] [2020-11-06 22:01:40,073 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 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 [2020-11-06 22:01:40,175 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-06 22:01:40,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:01:40,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-06 22:01:40,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:01:40,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 327 proven. 131 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2020-11-06 22:01:40,355 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:01:40,355 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 13 [2020-11-06 22:01:40,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679009166] [2020-11-06 22:01:40,356 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-06 22:01:40,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:01:40,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-06 22:01:40,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:01:40,357 INFO L87 Difference]: Start difference. First operand 72 states and 100 transitions. Second operand 13 states. [2020-11-06 22:01:41,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:01:41,354 INFO L93 Difference]: Finished difference Result 187 states and 327 transitions. [2020-11-06 22:01:41,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-06 22:01:41,355 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 152 [2020-11-06 22:01:41,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:01:41,358 INFO L225 Difference]: With dead ends: 187 [2020-11-06 22:01:41,359 INFO L226 Difference]: Without dead ends: 68 [2020-11-06 22:01:41,363 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=160, Invalid=490, Unknown=0, NotChecked=0, Total=650 [2020-11-06 22:01:41,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-11-06 22:01:41,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-11-06 22:01:41,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-11-06 22:01:41,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2020-11-06 22:01:41,377 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 152 [2020-11-06 22:01:41,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:01:41,378 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2020-11-06 22:01:41,378 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-06 22:01:41,378 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2020-11-06 22:01:41,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-11-06 22:01:41,381 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:01:41,381 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:01:41,590 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-06 22:01:41,591 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:01:41,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:01:41,592 INFO L82 PathProgramCache]: Analyzing trace with hash -667659703, now seen corresponding path program 5 times [2020-11-06 22:01:41,592 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:01:41,592 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28277866] [2020-11-06 22:01:41,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:01:41,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:01:41,620 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:01:41,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:01:41,644 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:01:41,690 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:01:41,691 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:01:41,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-11-06 22:01:41,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:01:41 BoogieIcfgContainer [2020-11-06 22:01:41,788 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:01:41,790 INFO L168 Benchmark]: Toolchain (without parser) took 9363.06 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 128.1 MB in the beginning and 148.6 MB in the end (delta: -20.6 MB). Peak memory consumption was 47.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:01:41,790 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 125.8 MB. Free memory was 101.9 MB in the beginning and 101.9 MB in the end (delta: 70.9 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:01:41,791 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.63 ms. Allocated memory is still 151.0 MB. Free memory was 127.5 MB in the beginning and 117.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-11-06 22:01:41,792 INFO L168 Benchmark]: Boogie Preprocessor took 34.83 ms. Allocated memory is still 151.0 MB. Free memory was 117.9 MB in the beginning and 116.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:01:41,792 INFO L168 Benchmark]: RCFGBuilder took 639.17 ms. Allocated memory is still 151.0 MB. Free memory was 116.5 MB in the beginning and 103.6 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-11-06 22:01:41,793 INFO L168 Benchmark]: TraceAbstraction took 8435.22 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 103.2 MB in the beginning and 148.6 MB in the end (delta: -45.4 MB). Peak memory consumption was 21.9 MB. Max. memory is 8.0 GB. [2020-11-06 22:01:41,797 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 125.8 MB. Free memory was 101.9 MB in the beginning and 101.9 MB in the end (delta: 70.9 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 240.63 ms. Allocated memory is still 151.0 MB. Free memory was 127.5 MB in the beginning and 117.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.83 ms. Allocated memory is still 151.0 MB. Free memory was 117.9 MB in the beginning and 116.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 639.17 ms. Allocated memory is still 151.0 MB. Free memory was 116.5 MB in the beginning and 103.6 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 8435.22 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 103.2 MB in the beginning and 148.6 MB in the end (delta: -45.4 MB). Peak memory consumption was 21.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L30] int x = __VERIFIER_nondet_int(); [L31] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L19] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L21] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L19] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L21] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L24] return fibonacci(n-1) + fibonacci(n-2); [L31] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L31] int result = fibonacci(x); [L32] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L35] CALL reach_error() [L3] __assert_fail("0", "Fibonacci04.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 8.2s, OverallIterations: 8, TraceHistogramMax: 21, AutomataDifference: 3.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 147 SDtfs, 293 SDslu, 171 SDs, 0 SdLazy, 807 SolverSat, 256 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 534 GetRequests, 432 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 2.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 8 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 812 NumberOfCodeBlocks, 779 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 689 ConstructedInterpolants, 0 QuantifiedInterpolants, 116249 SizeOfPredicates, 20 NumberOfNonLiveVariables, 957 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 2536/3048 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...