/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:31:47,516 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 00:31:47,546 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:31:47,547 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:31:47,548 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:31:47,551 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:31:47,552 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:31:47,553 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:31:47,554 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:31:47,556 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:31:47,557 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:31:47,558 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:31:47,559 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:31:47,560 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:31:47,562 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:31:47,571 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 [2020-07-21 00:31:47,584 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:31:47,585 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:31:47,586 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:31:47,586 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:31:47,586 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:31:47,586 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:31:47,587 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:31:47,587 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:31:47,587 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:31:47,587 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:31:47,587 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:31:47,588 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:31:47,588 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:31:47,588 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:31:47,588 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:31:47,588 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:31:47,588 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:31:47,589 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:31:47,589 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:31:47,589 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:31:47,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:31:47,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:31:47,590 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:31:47,590 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:31:47,590 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:31:47,590 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:31:47,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:47,591 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:31:47,591 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:31:47,591 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 00:31:47,910 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:31:47,922 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:31:47,926 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:31:47,927 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:31:47,927 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:31:47,928 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-21 00:31:48,004 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6506b82c8/9e21448d736d424c9805f635140a904a/FLAG1f28176cb [2020-07-21 00:31:48,429 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:31:48,431 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-21 00:31:48,437 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6506b82c8/9e21448d736d424c9805f635140a904a/FLAG1f28176cb [2020-07-21 00:31:48,844 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6506b82c8/9e21448d736d424c9805f635140a904a [2020-07-21 00:31:48,854 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:31:48,857 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:31:48,859 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:31:48,859 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:31:48,863 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:31:48,864 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:31:48" (1/1) ... [2020-07-21 00:31:48,867 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75f84de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:48, skipping insertion in model container [2020-07-21 00:31:48,867 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:31:48" (1/1) ... [2020-07-21 00:31:48,876 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:31:48,894 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:31:49,126 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:31:49,130 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:31:49,152 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:31:49,168 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:31:49,168 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49 WrapperNode [2020-07-21 00:31:49,175 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:31:49,176 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:31:49,176 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:31:49,176 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:31:49,192 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (1/1) ... [2020-07-21 00:31:49,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (1/1) ... [2020-07-21 00:31:49,200 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (1/1) ... [2020-07-21 00:31:49,200 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (1/1) ... [2020-07-21 00:31:49,280 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (1/1) ... [2020-07-21 00:31:49,283 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (1/1) ... [2020-07-21 00:31:49,284 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (1/1) ... [2020-07-21 00:31:49,290 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:31:49,290 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:31:49,290 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:31:49,290 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:31:49,292 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (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 [2020-07-21 00:31:49,358 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:31:49,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:31:49,359 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-21 00:31:49,359 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:31:49,359 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:31:49,359 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:31:49,360 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-21 00:31:49,360 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:31:49,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:31:49,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:31:49,528 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:31:49,528 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:31:49,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:31:49 BoogieIcfgContainer [2020-07-21 00:31:49,532 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:31:49,533 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:31:49,533 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:31:49,537 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:31:49,537 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:31:48" (1/3) ... [2020-07-21 00:31:49,538 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f3d7c9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:31:49, skipping insertion in model container [2020-07-21 00:31:49,538 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:31:49" (2/3) ... [2020-07-21 00:31:49,538 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f3d7c9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:31:49, skipping insertion in model container [2020-07-21 00:31:49,539 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:31:49" (3/3) ... [2020-07-21 00:31:49,540 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-07-21 00:31:49,550 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:31:49,557 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:31:49,572 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:31:49,593 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:31:49,594 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:31:49,594 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:31:49,594 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:31:49,594 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:31:49,594 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:31:49,595 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:31:49,595 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:31:49,612 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-21 00:31:49,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:31:49,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:49,620 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:31:49,620 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:49,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:49,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-07-21 00:31:49,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:49,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923375587] [2020-07-21 00:31:49,632 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:49,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:31:49,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:31:49,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:31:49,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:31:49,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:31:49,792 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:31:49,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923375587] [2020-07-21 00:31:49,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:31:49,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:31:49,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509784456] [2020-07-21 00:31:49,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:31:49,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:31:49,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:31:49,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:31:49,830 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-07-21 00:31:49,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:31:49,940 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 00:31:49,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:31:49,943 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:31:49,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:31:49,953 INFO L225 Difference]: With dead ends: 35 [2020-07-21 00:31:49,953 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:31:49,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:31:49,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:31:50,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:31:50,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:31:50,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:31:50,008 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 00:31:50,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:31:50,009 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:31:50,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:31:50,010 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:31:50,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:31:50,012 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:50,012 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:31:50,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:50,227 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:50,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:50,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-07-21 00:31:50,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:50,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31021844] [2020-07-21 00:31:50,229 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:50,259 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:31:50,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:31:50,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:31:50,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:31:50,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:31:50,312 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:31:50,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31021844] [2020-07-21 00:31:50,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:31:50,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:31:50,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426124420] [2020-07-21 00:31:50,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:31:50,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:31:50,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:31:50,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:31:50,317 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 00:31:50,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:31:50,379 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 00:31:50,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:31:50,380 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:31:50,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:31:50,381 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:31:50,382 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:31:50,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:31:50,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:31:50,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:31:50,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:31:50,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:31:50,391 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 00:31:50,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:31:50,391 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:31:50,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:31:50,392 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:31:50,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:31:50,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:50,393 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] [2020-07-21 00:31:50,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:50,609 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:50,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:50,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-07-21 00:31:50,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:50,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921662294] [2020-07-21 00:31:50,611 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:50,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:31:50,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:31:50,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 00:31:50,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:31:50,717 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:31:50,718 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:31:50,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921662294] [2020-07-21 00:31:50,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:31:50,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 00:31:50,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054235309] [2020-07-21 00:31:50,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 00:31:50,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:31:50,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 00:31:50,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:31:50,723 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2020-07-21 00:31:50,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:31:50,851 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-21 00:31:50,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:31:50,852 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-07-21 00:31:50,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:31:50,855 INFO L225 Difference]: With dead ends: 38 [2020-07-21 00:31:50,855 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:31:50,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:31:50,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:31:50,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 00:31:50,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 00:31:50,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-07-21 00:31:50,869 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-07-21 00:31:50,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:31:50,869 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-07-21 00:31:50,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 00:31:50,870 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-07-21 00:31:50,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:31:50,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:50,871 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] [2020-07-21 00:31:51,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:51,086 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:51,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:51,088 INFO L82 PathProgramCache]: Analyzing trace with hash -624449707, now seen corresponding path program 1 times [2020-07-21 00:31:51,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:51,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615998477] [2020-07-21 00:31:51,089 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:51,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:31:51,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:31:51,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:31:51,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:31:51,189 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 00:31:51,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:31:51,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:51,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:51,387 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:31:51,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615998477] [2020-07-21 00:31:51,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:31:51,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2020-07-21 00:31:51,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216188323] [2020-07-21 00:31:51,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 00:31:51,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:31:51,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 00:31:51,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-21 00:31:51,390 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 10 states. [2020-07-21 00:31:51,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:31:51,510 INFO L93 Difference]: Finished difference Result 39 states and 56 transitions. [2020-07-21 00:31:51,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:31:51,511 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 00:31:51,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:31:51,514 INFO L225 Difference]: With dead ends: 39 [2020-07-21 00:31:51,514 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 00:31:51,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:31:51,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 00:31:51,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 00:31:51,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 00:31:51,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 49 transitions. [2020-07-21 00:31:51,526 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 49 transitions. Word has length 27 [2020-07-21 00:31:51,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:31:51,526 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 49 transitions. [2020-07-21 00:31:51,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 00:31:51,527 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 49 transitions. [2020-07-21 00:31:51,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 00:31:51,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:51,531 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 8, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:31:51,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:51,745 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:51,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:51,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1317930072, now seen corresponding path program 2 times [2020-07-21 00:31:51,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:51,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957533796] [2020-07-21 00:31:51,747 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:51,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:31:51,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:31:51,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:31:51,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:31:51,889 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 221 proven. 13 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2020-07-21 00:31:51,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:31:52,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:52,459 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 58 proven. 126 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-21 00:31:52,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957533796] [2020-07-21 00:31:52,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:31:52,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 00:31:52,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358447978] [2020-07-21 00:31:52,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:31:52,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:31:52,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:31:52,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:31:52,462 INFO L87 Difference]: Start difference. First operand 33 states and 49 transitions. Second operand 11 states. [2020-07-21 00:31:52,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:31:52,631 INFO L93 Difference]: Finished difference Result 65 states and 113 transitions. [2020-07-21 00:31:52,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:31:52,632 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 93 [2020-07-21 00:31:52,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:31:52,634 INFO L225 Difference]: With dead ends: 65 [2020-07-21 00:31:52,634 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 00:31:52,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 169 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2020-07-21 00:31:52,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 00:31:52,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2020-07-21 00:31:52,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 00:31:52,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 49 transitions. [2020-07-21 00:31:52,644 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 49 transitions. Word has length 93 [2020-07-21 00:31:52,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:31:52,645 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 49 transitions. [2020-07-21 00:31:52,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:31:52,645 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 49 transitions. [2020-07-21 00:31:52,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 00:31:52,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:52,647 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] [2020-07-21 00:31:52,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:52,854 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:52,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:52,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 3 times [2020-07-21 00:31:52,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:52,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547433555] [2020-07-21 00:31:52,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:52,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:31:52,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:31:52,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:31:52,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:31:53,003 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 82 proven. 122 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-21 00:31:53,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:31:53,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:53,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:53,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:53,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:53,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:53,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:53,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:53,941 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 82 proven. 134 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2020-07-21 00:31:53,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547433555] [2020-07-21 00:31:53,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:31:53,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 00:31:53,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900724471] [2020-07-21 00:31:53,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:31:53,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:31:53,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:31:53,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:31:53,944 INFO L87 Difference]: Start difference. First operand 35 states and 49 transitions. Second operand 17 states. [2020-07-21 00:31:54,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:31:54,347 INFO L93 Difference]: Finished difference Result 78 states and 125 transitions. [2020-07-21 00:31:54,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:31:54,347 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 82 [2020-07-21 00:31:54,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:31:54,350 INFO L225 Difference]: With dead ends: 78 [2020-07-21 00:31:54,350 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 00:31:54,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 139 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=237, Invalid=575, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:31:54,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 00:31:54,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 00:31:54,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 00:31:54,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-07-21 00:31:54,373 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 82 [2020-07-21 00:31:54,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:31:54,374 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-07-21 00:31:54,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:31:54,374 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-07-21 00:31:54,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 00:31:54,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:54,380 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] [2020-07-21 00:31:54,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:54,597 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:54,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:54,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 4 times [2020-07-21 00:31:54,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:54,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223144188] [2020-07-21 00:31:54,599 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:54,661 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:31:54,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:31:54,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:31:54,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:31:54,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 418 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2020-07-21 00:31:54,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:31:55,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:55,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:55,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:55,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:56,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:56,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:56,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:31:56,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 445 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2020-07-21 00:31:56,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223144188] [2020-07-21 00:31:56,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:31:56,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 00:31:56,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936873019] [2020-07-21 00:31:56,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:31:56,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:31:56,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:31:56,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:31:56,395 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 21 states. [2020-07-21 00:31:56,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:31:56,939 INFO L93 Difference]: Finished difference Result 109 states and 162 transitions. [2020-07-21 00:31:56,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 00:31:56,940 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 150 [2020-07-21 00:31:56,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:31:56,947 INFO L225 Difference]: With dead ends: 109 [2020-07-21 00:31:56,947 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 00:31:56,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 263 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=363, Invalid=969, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 00:31:56,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 00:31:56,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 61. [2020-07-21 00:31:56,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:31:56,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-21 00:31:56,970 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 150 [2020-07-21 00:31:56,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:31:56,970 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-21 00:31:56,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:31:56,971 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-21 00:31:56,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 00:31:56,975 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:31:56,975 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] [2020-07-21 00:31:57,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:57,181 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:31:57,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:31:57,181 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 5 times [2020-07-21 00:31:57,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:31:57,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731523540] [2020-07-21 00:31:57,183 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:57,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:31:57,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 00:31:57,251 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:31:57,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 00:31:57,274 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:31:57,299 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 00:31:57,300 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 00:31:57,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:31:57,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:31:57 BoogieIcfgContainer [2020-07-21 00:31:57,553 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:31:57,555 INFO L168 Benchmark]: Toolchain (without parser) took 8698.53 ms. Allocated memory was 142.1 MB in the beginning and 286.8 MB in the end (delta: 144.7 MB). Free memory was 106.5 MB in the beginning and 182.8 MB in the end (delta: -76.4 MB). Peak memory consumption was 68.3 MB. Max. memory is 7.1 GB. [2020-07-21 00:31:57,556 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 142.1 MB. Free memory was 125.1 MB in the beginning and 124.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 00:31:57,557 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.21 ms. Allocated memory is still 142.1 MB. Free memory was 106.2 MB in the beginning and 96.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 00:31:57,558 INFO L168 Benchmark]: Boogie Preprocessor took 113.74 ms. Allocated memory was 142.1 MB in the beginning and 202.4 MB in the end (delta: 60.3 MB). Free memory was 96.3 MB in the beginning and 181.3 MB in the end (delta: -85.0 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 00:31:57,559 INFO L168 Benchmark]: RCFGBuilder took 241.79 ms. Allocated memory is still 202.4 MB. Free memory was 181.3 MB in the beginning and 169.2 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:31:57,559 INFO L168 Benchmark]: TraceAbstraction took 8019.67 ms. Allocated memory was 202.4 MB in the beginning and 286.8 MB in the end (delta: 84.4 MB). Free memory was 169.2 MB in the beginning and 182.8 MB in the end (delta: -13.6 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. [2020-07-21 00:31:57,563 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 142.1 MB. Free memory was 125.1 MB in the beginning and 124.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 317.21 ms. Allocated memory is still 142.1 MB. Free memory was 106.2 MB in the beginning and 96.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.74 ms. Allocated memory was 142.1 MB in the beginning and 202.4 MB in the end (delta: 60.3 MB). Free memory was 96.3 MB in the beginning and 181.3 MB in the end (delta: -85.0 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 241.79 ms. Allocated memory is still 202.4 MB. Free memory was 181.3 MB in the beginning and 169.2 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8019.67 ms. Allocated memory was 202.4 MB in the beginning and 286.8 MB in the end (delta: 84.4 MB). Free memory was 169.2 MB in the beginning and 182.8 MB in the end (delta: -13.6 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 33]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int x = __VERIFIER_nondet_int(); [L29] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L17] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L19] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L17] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L19] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L22] return fibonacci(n-1) + fibonacci(n-2); [L29] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L29] int result = fibonacci(x); [L30] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L33] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.9s, OverallIterations: 8, TraceHistogramMax: 21, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 134 SDtfs, 339 SDslu, 407 SDs, 0 SdLazy, 540 SolverSat, 321 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 798 GetRequests, 656 SyntacticMatches, 40 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=7, 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, 12 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.8s InterpolantComputationTime, 514 NumberOfCodeBlocks, 401 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 746 ConstructedInterpolants, 0 QuantifiedInterpolants, 155401 SizeOfPredicates, 33 NumberOfNonLiveVariables, 676 ConjunctsInSsa, 59 ConjunctsInUnsatCore, 11 InterpolantComputations, 3 PerfectInterpolantSequences, 2470/3742 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...