/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 22:07:17,416 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 22:07:17,419 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 22:07:17,443 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 22:07:17,461 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 22:07:17,465 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 22:07:17,467 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 22:07:17,469 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 22:07:17,470 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 22:07:17,472 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 22:07:17,474 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 22:07:17,479 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 22:07:17,482 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 22:07:17,483 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 22:07:17,484 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 22:07:17,484 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 22:07:17,496 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 22:07:17,508 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 22:07:17,511 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 22:07:17,512 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 22:07:17,516 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 22:07:17,528 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 22:07:17,530 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 22:07:17,531 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 22:07:17,531 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 22:07:17,532 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 22:07:17,532 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 22:07:17,532 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 22:07:17,532 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 22:07:17,532 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 22:07:17,533 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 22:07:17,533 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 22:07:17,533 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 22:07:17,533 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 22:07:17,533 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 22:07:17,533 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 22:07:17,534 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 22:07:17,534 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 22:07:17,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 22:07:17,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 22:07:17,535 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 22:07:17,535 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 22:07:17,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 22:07:17,535 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 22:07:17,837 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 22:07:17,848 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 22:07:17,851 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 22:07:17,853 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 22:07:17,853 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 22:07:17,854 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-08-22 22:07:17,917 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5e0740757/8c89d16ebf084fe0be336ff8f30404cb/FLAG818c354c2 [2020-08-22 22:07:18,297 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 22:07:18,297 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-08-22 22:07:18,304 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5e0740757/8c89d16ebf084fe0be336ff8f30404cb/FLAG818c354c2 [2020-08-22 22:07:18,733 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5e0740757/8c89d16ebf084fe0be336ff8f30404cb [2020-08-22 22:07:18,745 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 22:07:18,748 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 22:07:18,752 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 22:07:18,753 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 22:07:18,756 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 22:07:18,757 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:18,761 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@368cffb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18, skipping insertion in model container [2020-08-22 22:07:18,761 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:18,769 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 22:07:18,788 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 22:07:18,945 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:07:18,949 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 22:07:18,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:07:18,981 INFO L208 MainTranslator]: Completed translation [2020-08-22 22:07:18,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18 WrapperNode [2020-08-22 22:07:18,982 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 22:07:18,983 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 22:07:18,983 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 22:07:18,983 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 22:07:18,996 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:18,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:19,084 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:19,084 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:19,089 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:19,091 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:19,096 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... [2020-08-22 22:07:19,103 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 22:07:19,104 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 22:07:19,104 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 22:07:19,104 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 22:07:19,105 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 22:07:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 22:07:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 22:07:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-08-22 22:07:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-08-22 22:07:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 22:07:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 22:07:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 22:07:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-08-22 22:07:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-08-22 22:07:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 22:07:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 22:07:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 22:07:19,392 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 22:07:19,392 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 22:07:19,396 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:07:19 BoogieIcfgContainer [2020-08-22 22:07:19,397 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 22:07:19,398 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 22:07:19,398 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 22:07:19,402 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 22:07:19,402 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 10:07:18" (1/3) ... [2020-08-22 22:07:19,403 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b9b6ace and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:07:19, skipping insertion in model container [2020-08-22 22:07:19,403 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:07:18" (2/3) ... [2020-08-22 22:07:19,404 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b9b6ace and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:07:19, skipping insertion in model container [2020-08-22 22:07:19,404 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:07:19" (3/3) ... [2020-08-22 22:07:19,406 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-08-22 22:07:19,416 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 22:07:19,424 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 22:07:19,437 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 22:07:19,457 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 22:07:19,458 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 22:07:19,458 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 22:07:19,458 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 22:07:19,458 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 22:07:19,458 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 22:07:19,458 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 22:07:19,459 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 22:07:19,473 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2020-08-22 22:07:19,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 22:07:19,484 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:19,485 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:19,486 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:19,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:19,492 INFO L82 PathProgramCache]: Analyzing trace with hash -1089710179, now seen corresponding path program 1 times [2020-08-22 22:07:19,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:19,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [813935869] [2020-08-22 22:07:19,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:19,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:19,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:19,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:19,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:19,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:19,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:07:19,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [813935869] [2020-08-22 22:07:19,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:07:19,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 22:07:19,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391800923] [2020-08-22 22:07:19,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 22:07:19,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:19,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 22:07:19,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:07:19,814 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 5 states. [2020-08-22 22:07:19,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:19,949 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2020-08-22 22:07:19,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 22:07:19,950 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-22 22:07:19,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:19,962 INFO L225 Difference]: With dead ends: 58 [2020-08-22 22:07:19,962 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 22:07:19,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:07:19,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 22:07:20,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 22:07:20,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 22:07:20,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-08-22 22:07:20,016 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 16 [2020-08-22 22:07:20,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:20,017 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-08-22 22:07:20,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 22:07:20,017 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-08-22 22:07:20,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 22:07:20,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:20,019 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:20,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 22:07:20,020 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:20,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:20,021 INFO L82 PathProgramCache]: Analyzing trace with hash -653728005, now seen corresponding path program 1 times [2020-08-22 22:07:20,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:20,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [205741436] [2020-08-22 22:07:20,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:20,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:20,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:20,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:07:20,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [205741436] [2020-08-22 22:07:20,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:07:20,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 22:07:20,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844341135] [2020-08-22 22:07:20,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 22:07:20,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:20,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 22:07:20,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:07:20,088 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 5 states. [2020-08-22 22:07:20,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:20,168 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-22 22:07:20,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 22:07:20,169 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 22:07:20,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:20,172 INFO L225 Difference]: With dead ends: 50 [2020-08-22 22:07:20,172 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 22:07:20,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:07:20,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 22:07:20,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-08-22 22:07:20,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 22:07:20,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-08-22 22:07:20,188 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 17 [2020-08-22 22:07:20,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:20,188 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-08-22 22:07:20,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 22:07:20,189 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-08-22 22:07:20,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 22:07:20,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:20,191 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:20,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 22:07:20,192 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:20,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:20,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1617834856, now seen corresponding path program 1 times [2020-08-22 22:07:20,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:20,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139379910] [2020-08-22 22:07:20,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:20,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:20,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:20,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:20,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 22:07:20,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 22:07:20,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139379910] [2020-08-22 22:07:20,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:20,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 22:07:20,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177547163] [2020-08-22 22:07:20,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 22:07:20,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:20,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 22:07:20,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 22:07:20,390 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 7 states. [2020-08-22 22:07:20,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:20,489 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2020-08-22 22:07:20,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 22:07:20,490 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-08-22 22:07:20,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:20,492 INFO L225 Difference]: With dead ends: 82 [2020-08-22 22:07:20,492 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 22:07:20,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:07:20,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 22:07:20,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-08-22 22:07:20,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 22:07:20,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2020-08-22 22:07:20,515 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 33 [2020-08-22 22:07:20,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:20,516 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2020-08-22 22:07:20,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 22:07:20,516 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2020-08-22 22:07:20,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 22:07:20,519 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:20,519 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:20,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 22:07:20,520 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:20,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:20,521 INFO L82 PathProgramCache]: Analyzing trace with hash 887160861, now seen corresponding path program 1 times [2020-08-22 22:07:20,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:20,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114486469] [2020-08-22 22:07:20,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:20,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:20,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:20,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:20,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:07:20,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,719 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 22:07:20,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114486469] [2020-08-22 22:07:20,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:20,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 22:07:20,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484829490] [2020-08-22 22:07:20,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 22:07:20,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:20,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 22:07:20,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 22:07:20,722 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand 7 states. [2020-08-22 22:07:20,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:20,932 INFO L93 Difference]: Finished difference Result 74 states and 94 transitions. [2020-08-22 22:07:20,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 22:07:20,933 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-08-22 22:07:20,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:20,936 INFO L225 Difference]: With dead ends: 74 [2020-08-22 22:07:20,936 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 22:07:20,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-08-22 22:07:20,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 22:07:20,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2020-08-22 22:07:20,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-22 22:07:20,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 83 transitions. [2020-08-22 22:07:20,957 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 83 transitions. Word has length 34 [2020-08-22 22:07:20,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:20,958 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 83 transitions. [2020-08-22 22:07:20,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 22:07:20,958 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 83 transitions. [2020-08-22 22:07:20,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 22:07:20,961 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:20,961 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:20,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 22:07:20,961 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:20,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:20,962 INFO L82 PathProgramCache]: Analyzing trace with hash 1875452576, now seen corresponding path program 1 times [2020-08-22 22:07:20,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:20,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459313000] [2020-08-22 22:07:20,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:20,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:20,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:20,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:20,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 22:07:21,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-22 22:07:21,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,062 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-08-22 22:07:21,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459313000] [2020-08-22 22:07:21,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:21,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 22:07:21,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241505498] [2020-08-22 22:07:21,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 22:07:21,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:21,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 22:07:21,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:07:21,065 INFO L87 Difference]: Start difference. First operand 66 states and 83 transitions. Second operand 6 states. [2020-08-22 22:07:21,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:21,140 INFO L93 Difference]: Finished difference Result 130 states and 178 transitions. [2020-08-22 22:07:21,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 22:07:21,141 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 50 [2020-08-22 22:07:21,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:21,143 INFO L225 Difference]: With dead ends: 130 [2020-08-22 22:07:21,143 INFO L226 Difference]: Without dead ends: 70 [2020-08-22 22:07:21,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 22:07:21,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-22 22:07:21,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-22 22:07:21,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 22:07:21,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2020-08-22 22:07:21,163 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 50 [2020-08-22 22:07:21,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:21,164 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2020-08-22 22:07:21,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 22:07:21,164 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2020-08-22 22:07:21,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 22:07:21,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:21,167 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:21,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 22:07:21,168 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:21,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:21,168 INFO L82 PathProgramCache]: Analyzing trace with hash 104828256, now seen corresponding path program 1 times [2020-08-22 22:07:21,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:21,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772153796] [2020-08-22 22:07:21,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:21,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:21,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:21,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:07:21,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:07:21,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,291 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-08-22 22:07:21,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772153796] [2020-08-22 22:07:21,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:21,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 22:07:21,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444100093] [2020-08-22 22:07:21,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 22:07:21,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:21,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 22:07:21,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:07:21,294 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand 8 states. [2020-08-22 22:07:21,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:21,404 INFO L93 Difference]: Finished difference Result 142 states and 197 transitions. [2020-08-22 22:07:21,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 22:07:21,405 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 51 [2020-08-22 22:07:21,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:21,407 INFO L225 Difference]: With dead ends: 142 [2020-08-22 22:07:21,407 INFO L226 Difference]: Without dead ends: 78 [2020-08-22 22:07:21,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 22:07:21,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-22 22:07:21,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2020-08-22 22:07:21,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-22 22:07:21,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 92 transitions. [2020-08-22 22:07:21,426 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 92 transitions. Word has length 51 [2020-08-22 22:07:21,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:21,427 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 92 transitions. [2020-08-22 22:07:21,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 22:07:21,427 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 92 transitions. [2020-08-22 22:07:21,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 22:07:21,430 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:21,430 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:21,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 22:07:21,431 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:21,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:21,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1703786405, now seen corresponding path program 1 times [2020-08-22 22:07:21,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:21,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1532866508] [2020-08-22 22:07:21,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:21,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:21,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:21,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:07:21,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:07:21,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,547 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-08-22 22:07:21,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1532866508] [2020-08-22 22:07:21,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:21,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 22:07:21,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974028933] [2020-08-22 22:07:21,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 22:07:21,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:21,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 22:07:21,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:07:21,550 INFO L87 Difference]: Start difference. First operand 72 states and 92 transitions. Second operand 8 states. [2020-08-22 22:07:21,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:21,734 INFO L93 Difference]: Finished difference Result 118 states and 158 transitions. [2020-08-22 22:07:21,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 22:07:21,734 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 52 [2020-08-22 22:07:21,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:21,737 INFO L225 Difference]: With dead ends: 118 [2020-08-22 22:07:21,737 INFO L226 Difference]: Without dead ends: 112 [2020-08-22 22:07:21,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-22 22:07:21,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-22 22:07:21,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2020-08-22 22:07:21,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-22 22:07:21,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 145 transitions. [2020-08-22 22:07:21,763 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 145 transitions. Word has length 52 [2020-08-22 22:07:21,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:21,763 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 145 transitions. [2020-08-22 22:07:21,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 22:07:21,764 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 145 transitions. [2020-08-22 22:07:21,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 22:07:21,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:21,767 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:21,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 22:07:21,768 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:21,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:21,769 INFO L82 PathProgramCache]: Analyzing trace with hash -521446491, now seen corresponding path program 1 times [2020-08-22 22:07:21,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:21,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1835481336] [2020-08-22 22:07:21,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:21,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:21,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:21,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:21,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:07:21,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:07:21,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-22 22:07:21,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:21,987 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-22 22:07:21,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1835481336] [2020-08-22 22:07:21,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:21,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 22:07:21,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879751478] [2020-08-22 22:07:21,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 22:07:21,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:21,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 22:07:21,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:07:21,992 INFO L87 Difference]: Start difference. First operand 106 states and 145 transitions. Second operand 8 states. [2020-08-22 22:07:22,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:22,141 INFO L93 Difference]: Finished difference Result 227 states and 348 transitions. [2020-08-22 22:07:22,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 22:07:22,142 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-08-22 22:07:22,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:22,147 INFO L225 Difference]: With dead ends: 227 [2020-08-22 22:07:22,147 INFO L226 Difference]: Without dead ends: 127 [2020-08-22 22:07:22,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 22:07:22,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-22 22:07:22,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 115. [2020-08-22 22:07:22,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-22 22:07:22,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 161 transitions. [2020-08-22 22:07:22,193 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 161 transitions. Word has length 69 [2020-08-22 22:07:22,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:22,196 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 161 transitions. [2020-08-22 22:07:22,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 22:07:22,196 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 161 transitions. [2020-08-22 22:07:22,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-22 22:07:22,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:22,199 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:22,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 22:07:22,200 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:22,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:22,200 INFO L82 PathProgramCache]: Analyzing trace with hash -439633211, now seen corresponding path program 1 times [2020-08-22 22:07:22,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:22,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259642390] [2020-08-22 22:07:22,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:22,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:22,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:22,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:07:22,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:07:22,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 22:07:22,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,417 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-22 22:07:22,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259642390] [2020-08-22 22:07:22,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:22,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 22:07:22,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317310637] [2020-08-22 22:07:22,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 22:07:22,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:22,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 22:07:22,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-22 22:07:22,427 INFO L87 Difference]: Start difference. First operand 115 states and 161 transitions. Second operand 10 states. [2020-08-22 22:07:22,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:22,671 INFO L93 Difference]: Finished difference Result 257 states and 400 transitions. [2020-08-22 22:07:22,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 22:07:22,672 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 70 [2020-08-22 22:07:22,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:22,675 INFO L225 Difference]: With dead ends: 257 [2020-08-22 22:07:22,675 INFO L226 Difference]: Without dead ends: 151 [2020-08-22 22:07:22,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-08-22 22:07:22,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-08-22 22:07:22,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 133. [2020-08-22 22:07:22,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-22 22:07:22,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 191 transitions. [2020-08-22 22:07:22,701 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 191 transitions. Word has length 70 [2020-08-22 22:07:22,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:22,702 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 191 transitions. [2020-08-22 22:07:22,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 22:07:22,702 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 191 transitions. [2020-08-22 22:07:22,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-22 22:07:22,704 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:22,705 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:22,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 22:07:22,705 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:22,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:22,706 INFO L82 PathProgramCache]: Analyzing trace with hash 307755032, now seen corresponding path program 2 times [2020-08-22 22:07:22,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:22,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927053486] [2020-08-22 22:07:22,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:22,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:07:22,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:07:22,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:07:22,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:07:22,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 22:07:22,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:07:22,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:07:22,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:07:22,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:07:22,996 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 36 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-08-22 22:07:22,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927053486] [2020-08-22 22:07:22,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:07:22,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 22:07:22,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322839803] [2020-08-22 22:07:22,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 22:07:22,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:07:23,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 22:07:23,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-22 22:07:23,000 INFO L87 Difference]: Start difference. First operand 133 states and 191 transitions. Second operand 12 states. [2020-08-22 22:07:23,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:07:23,398 INFO L93 Difference]: Finished difference Result 265 states and 420 transitions. [2020-08-22 22:07:23,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 22:07:23,398 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 105 [2020-08-22 22:07:23,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:07:23,402 INFO L225 Difference]: With dead ends: 265 [2020-08-22 22:07:23,402 INFO L226 Difference]: Without dead ends: 116 [2020-08-22 22:07:23,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-08-22 22:07:23,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-22 22:07:23,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 103. [2020-08-22 22:07:23,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-22 22:07:23,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 127 transitions. [2020-08-22 22:07:23,421 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 127 transitions. Word has length 105 [2020-08-22 22:07:23,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:07:23,422 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 127 transitions. [2020-08-22 22:07:23,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 22:07:23,422 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 127 transitions. [2020-08-22 22:07:23,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-22 22:07:23,423 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:07:23,423 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:07:23,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 22:07:23,424 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:07:23,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:07:23,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1951493560, now seen corresponding path program 1 times [2020-08-22 22:07:23,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:07:23,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166199212] [2020-08-22 22:07:23,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:07:23,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:07:23,437 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:07:23,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:07:23,445 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:07:23,468 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 22:07:23,468 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 22:07:23,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 22:07:23,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 10:07:23 BoogieIcfgContainer [2020-08-22 22:07:23,506 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 22:07:23,509 INFO L168 Benchmark]: Toolchain (without parser) took 4760.62 ms. Allocated memory was 140.5 MB in the beginning and 282.1 MB in the end (delta: 141.6 MB). Free memory was 104.2 MB in the beginning and 178.6 MB in the end (delta: -74.4 MB). Peak memory consumption was 67.1 MB. Max. memory is 7.1 GB. [2020-08-22 22:07:23,509 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 22:07:23,510 INFO L168 Benchmark]: CACSL2BoogieTranslator took 229.92 ms. Allocated memory is still 140.5 MB. Free memory was 104.0 MB in the beginning and 94.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-08-22 22:07:23,511 INFO L168 Benchmark]: Boogie Preprocessor took 120.96 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 94.3 MB in the beginning and 182.6 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-08-22 22:07:23,512 INFO L168 Benchmark]: RCFGBuilder took 292.79 ms. Allocated memory is still 203.9 MB. Free memory was 182.6 MB in the beginning and 169.0 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-08-22 22:07:23,513 INFO L168 Benchmark]: TraceAbstraction took 4107.76 ms. Allocated memory was 203.9 MB in the beginning and 282.1 MB in the end (delta: 78.1 MB). Free memory was 168.3 MB in the beginning and 178.6 MB in the end (delta: -10.3 MB). Peak memory consumption was 67.8 MB. Max. memory is 7.1 GB. [2020-08-22 22:07:23,516 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 229.92 ms. Allocated memory is still 140.5 MB. Free memory was 104.0 MB in the beginning and 94.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 120.96 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 94.3 MB in the beginning and 182.6 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 292.79 ms. Allocated memory is still 203.9 MB. Free memory was 182.6 MB in the beginning and 169.0 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4107.76 ms. Allocated memory was 203.9 MB in the beginning and 282.1 MB in the end (delta: 78.1 MB). Free memory was 168.3 MB in the beginning and 178.6 MB in the end (delta: -10.3 MB). Peak memory consumption was 67.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; VAL [x=4] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); VAL [\old(n)=2, \result=1, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); VAL [\old(n)=3, \result=2, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); VAL [\old(n)=2, \result=1, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); VAL [\old(n)=4, \result=3, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L37] int result = fibo1(x); VAL [fibo1(x)=3, result=3, x=4] [L38] COND TRUE result == 3 VAL [result=3, x=4] [L39] __VERIFIER_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 45 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.0s, OverallIterations: 11, TraceHistogramMax: 6, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 436 SDtfs, 418 SDslu, 1642 SDs, 0 SdLazy, 1042 SolverSat, 117 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=133occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 10 MinimizatonAttempts, 61 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 584 NumberOfCodeBlocks, 584 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 487 ConstructedInterpolants, 0 QuantifiedInterpolants, 56021 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 10 InterpolantComputations, 2 PerfectInterpolantSequences, 207/306 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...