/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 NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -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 15:45:11,474 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:45:11,477 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:45:11,489 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:45:11,489 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:45:11,490 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:45:11,492 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:45:11,493 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:45:11,495 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:45:11,496 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:45:11,497 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:45:11,498 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:45:11,498 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:45:11,503 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:45:11,505 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:45:11,509 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:45:11,509 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:45:11,513 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:45:11,515 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:45:11,517 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:45:11,518 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:45:11,519 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:45:11,520 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:45:11,521 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:45:11,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:45:11,530 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:45:11,531 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:45:11,532 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:45:11,533 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 15:45:11,547 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:45:11,547 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:45:11,548 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:45:11,548 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:45:11,549 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:45:11,549 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:45:11,549 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:45:11,549 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:45:11,549 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:45:11,550 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:45:11,550 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:45:11,550 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:45:11,550 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:45:11,550 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:45:11,551 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:45:11,551 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:45:11,551 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:45:11,551 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:45:11,551 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:45:11,552 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:45:11,552 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:45:11,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:45:11,552 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:45:11,552 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:45:11,553 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:45:11,553 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:45:11,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:11,553 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:45:11,553 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:45:11,554 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 -> NUM_VARIABLES 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 -> 2 [2020-07-21 15:45:11,827 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:45:11,840 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:45:11,844 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:45:11,845 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:45:11,846 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:45:11,847 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-21 15:45:11,920 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9da00647a/145f4be516ab4fd4b57bf2dab3a38808/FLAGfdf92de88 [2020-07-21 15:45:12,360 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:45:12,360 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-21 15:45:12,367 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9da00647a/145f4be516ab4fd4b57bf2dab3a38808/FLAGfdf92de88 [2020-07-21 15:45:12,761 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9da00647a/145f4be516ab4fd4b57bf2dab3a38808 [2020-07-21 15:45:12,769 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:45:12,772 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:45:12,773 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:12,774 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:45:12,777 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:45:12,778 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:12" (1/1) ... [2020-07-21 15:45:12,781 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44de1606 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:12, skipping insertion in model container [2020-07-21 15:45:12,781 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:12" (1/1) ... [2020-07-21 15:45:12,790 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:45:12,810 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:45:13,014 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:13,018 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:45:13,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:13,050 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:45:13,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13 WrapperNode [2020-07-21 15:45:13,050 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:13,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:45:13,051 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:45:13,051 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:45:13,065 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (1/1) ... [2020-07-21 15:45:13,065 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (1/1) ... [2020-07-21 15:45:13,070 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (1/1) ... [2020-07-21 15:45:13,071 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (1/1) ... [2020-07-21 15:45:13,156 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (1/1) ... [2020-07-21 15:45:13,158 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (1/1) ... [2020-07-21 15:45:13,159 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (1/1) ... [2020-07-21 15:45:13,165 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:45:13,165 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:45:13,165 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:45:13,166 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:45:13,167 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (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 15:45:13,231 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:45:13,232 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:45:13,232 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-21 15:45:13,232 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:45:13,232 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:45:13,232 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:45:13,232 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-21 15:45:13,232 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:45:13,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:45:13,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:45:13,400 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:45:13,400 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:45:13,404 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:13 BoogieIcfgContainer [2020-07-21 15:45:13,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:45:13,405 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:45:13,406 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:45:13,409 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:45:13,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:45:12" (1/3) ... [2020-07-21 15:45:13,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e169498 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:13, skipping insertion in model container [2020-07-21 15:45:13,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:13" (2/3) ... [2020-07-21 15:45:13,411 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e169498 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:13, skipping insertion in model container [2020-07-21 15:45:13,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:13" (3/3) ... [2020-07-21 15:45:13,413 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-07-21 15:45:13,424 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:45:13,431 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:45:13,446 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:45:13,501 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:45:13,501 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:45:13,501 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:45:13,502 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:45:13,502 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:45:13,502 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:45:13,502 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:45:13,502 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:45:13,525 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-21 15:45:13,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 15:45:13,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:13,535 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:13,535 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:13,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:13,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-07-21 15:45:13,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:13,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873907020] [2020-07-21 15:45:13,559 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:13,640 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:13,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:13,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:45:13,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:13,737 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 15:45:13,737 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:45:13,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873907020] [2020-07-21 15:45:13,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:45:13,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:45:13,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128861591] [2020-07-21 15:45:13,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:45:13,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:13,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:45:13,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:45:13,760 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-07-21 15:45:13,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:13,874 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 15:45:13,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:45:13,876 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 15:45:13,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:13,886 INFO L225 Difference]: With dead ends: 35 [2020-07-21 15:45:13,887 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 15:45:13,890 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 15:45:13,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 15:45:13,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 15:45:13,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 15:45:13,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 15:45:13,932 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 15:45:13,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:13,932 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 15:45:13,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:45:13,933 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 15:45:13,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:45:13,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:13,934 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:14,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:14,142 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:14,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:14,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-07-21 15:45:14,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:14,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595587287] [2020-07-21 15:45:14,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:14,167 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:14,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:14,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:45:14,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:14,205 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 15:45:14,205 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:45:14,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595587287] [2020-07-21 15:45:14,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:45:14,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:45:14,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64965343] [2020-07-21 15:45:14,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:45:14,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:14,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:45:14,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:45:14,210 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 15:45:14,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:14,277 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 15:45:14,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:45:14,278 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 15:45:14,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:14,279 INFO L225 Difference]: With dead ends: 27 [2020-07-21 15:45:14,280 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 15:45:14,281 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 15:45:14,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 15:45:14,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 15:45:14,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 15:45:14,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 15:45:14,289 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 15:45:14,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:14,290 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 15:45:14,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:45:14,290 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 15:45:14,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 15:45:14,291 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:14,292 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 15:45:14,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:14,506 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:14,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:14,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-07-21 15:45:14,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:14,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458696911] [2020-07-21 15:45:14,509 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:14,565 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:14,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:14,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:45:14,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:14,623 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:45:14,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:14,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:14,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:14,889 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 15:45:14,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458696911] [2020-07-21 15:45:14,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:14,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2020-07-21 15:45:14,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083279485] [2020-07-21 15:45:14,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:45:14,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:14,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:45:14,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:45:14,906 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 10 states. [2020-07-21 15:45:15,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:15,060 INFO L93 Difference]: Finished difference Result 39 states and 57 transitions. [2020-07-21 15:45:15,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:45:15,061 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 15:45:15,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:15,065 INFO L225 Difference]: With dead ends: 39 [2020-07-21 15:45:15,065 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 15:45:15,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 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 15:45:15,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 15:45:15,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-07-21 15:45:15,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 15:45:15,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 15:45:15,090 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 26 [2020-07-21 15:45:15,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:15,091 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 15:45:15,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:45:15,091 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 15:45:15,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 15:45:15,097 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:15,097 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:15,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:15,304 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:15,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:15,305 INFO L82 PathProgramCache]: Analyzing trace with hash -801998671, now seen corresponding path program 1 times [2020-07-21 15:45:15,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:15,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192658889] [2020-07-21 15:45:15,305 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:15,353 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:15,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:15,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:45:15,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:15,426 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 36 proven. 40 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-07-21 15:45:15,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:15,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:15,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:15,867 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 36 proven. 44 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 15:45:15,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192658889] [2020-07-21 15:45:15,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:15,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 15:45:15,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785297930] [2020-07-21 15:45:15,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 15:45:15,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:15,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 15:45:15,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 15:45:15,871 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 15:45:16,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:16,118 INFO L93 Difference]: Finished difference Result 63 states and 103 transitions. [2020-07-21 15:45:16,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 15:45:16,118 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2020-07-21 15:45:16,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:16,121 INFO L225 Difference]: With dead ends: 63 [2020-07-21 15:45:16,121 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 15:45:16,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 91 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=258, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:45:16,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 15:45:16,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-21 15:45:16,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 15:45:16,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2020-07-21 15:45:16,132 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 54 [2020-07-21 15:45:16,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:16,132 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2020-07-21 15:45:16,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 15:45:16,133 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2020-07-21 15:45:16,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 15:45:16,136 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:16,136 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:16,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:16,350 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:16,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:16,352 INFO L82 PathProgramCache]: Analyzing trace with hash 1591893433, now seen corresponding path program 2 times [2020-07-21 15:45:16,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:16,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087574852] [2020-07-21 15:45:16,354 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:16,397 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:16,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:16,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:45:16,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:16,461 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 169 proven. 12 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 15:45:16,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:16,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:16,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:16,886 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 53 proven. 93 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 15:45:16,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087574852] [2020-07-21 15:45:16,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:16,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 15:45:16,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929747896] [2020-07-21 15:45:16,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 15:45:16,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:16,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 15:45:16,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 15:45:16,893 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand 11 states. [2020-07-21 15:45:17,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:17,070 INFO L93 Difference]: Finished difference Result 74 states and 100 transitions. [2020-07-21 15:45:17,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:45:17,071 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 80 [2020-07-21 15:45:17,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:17,073 INFO L225 Difference]: With dead ends: 74 [2020-07-21 15:45:17,073 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 15:45:17,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 143 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 15:45:17,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 15:45:17,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-07-21 15:45:17,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 15:45:17,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-07-21 15:45:17,097 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 80 [2020-07-21 15:45:17,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:17,097 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-07-21 15:45:17,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 15:45:17,097 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-07-21 15:45:17,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 15:45:17,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:17,104 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 15:45:17,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:17,321 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:17,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:17,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 3 times [2020-07-21 15:45:17,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:17,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915801252] [2020-07-21 15:45:17,324 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:17,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:17,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:17,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:45:17,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:17,456 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 82 proven. 120 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2020-07-21 15:45:17,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:17,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:17,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:18,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:18,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:18,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:18,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:18,302 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 15:45:18,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915801252] [2020-07-21 15:45:18,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:18,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 15:45:18,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568721456] [2020-07-21 15:45:18,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:45:18,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:18,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:45:18,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:45:18,305 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-07-21 15:45:18,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:18,689 INFO L93 Difference]: Finished difference Result 84 states and 115 transitions. [2020-07-21 15:45:18,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 15:45:18,691 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 82 [2020-07-21 15:45:18,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:18,693 INFO L225 Difference]: With dead ends: 84 [2020-07-21 15:45:18,694 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 15:45:18,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 139 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=237, Invalid=575, Unknown=0, NotChecked=0, Total=812 [2020-07-21 15:45:18,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 15:45:18,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2020-07-21 15:45:18,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 15:45:18,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-07-21 15:45:18,712 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 82 [2020-07-21 15:45:18,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:18,716 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-07-21 15:45:18,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:45:18,716 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-07-21 15:45:18,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:45:18,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:18,718 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:18,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:18,919 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:18,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:18,920 INFO L82 PathProgramCache]: Analyzing trace with hash -383842586, now seen corresponding path program 4 times [2020-07-21 15:45:18,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:18,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [345653068] [2020-07-21 15:45:18,921 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:18,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:18,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:18,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:45:18,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:19,037 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 15:45:19,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:19,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:19,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:19,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:19,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:19,576 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 103 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-21 15:45:19,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [345653068] [2020-07-21 15:45:19,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:19,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-21 15:45:19,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506734306] [2020-07-21 15:45:19,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:45:19,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:19,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:45:19,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:45:19,580 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 12 states. [2020-07-21 15:45:19,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:19,702 INFO L93 Difference]: Finished difference Result 53 states and 66 transitions. [2020-07-21 15:45:19,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:45:19,703 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 68 [2020-07-21 15:45:19,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:19,705 INFO L225 Difference]: With dead ends: 53 [2020-07-21 15:45:19,705 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 15:45:19,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:45:19,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 15:45:19,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 15:45:19,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 15:45:19,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-07-21 15:45:19,714 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 68 [2020-07-21 15:45:19,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:19,715 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-07-21 15:45:19,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:45:19,715 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-07-21 15:45:19,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 15:45:19,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:19,717 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 15:45:19,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:19,922 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:19,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:19,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 5 times [2020-07-21 15:45:19,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:19,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716232892] [2020-07-21 15:45:19,925 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 15:45:19,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:19,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:19,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 15:45:19,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:20,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 269 proven. 426 refuted. 0 times theorem prover too weak. 461 trivial. 0 not checked. [2020-07-21 15:45:20,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:21,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:21,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 269 proven. 467 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 15:45:21,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716232892] [2020-07-21 15:45:21,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:21,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 25 [2020-07-21 15:45:21,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331643621] [2020-07-21 15:45:22,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:45:22,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:22,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:45:22,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:45:22,001 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 25 states. [2020-07-21 15:45:22,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:22,843 INFO L93 Difference]: Finished difference Result 129 states and 216 transitions. [2020-07-21 15:45:22,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 15:45:22,844 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 150 [2020-07-21 15:45:22,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:22,850 INFO L225 Difference]: With dead ends: 129 [2020-07-21 15:45:22,850 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 15:45:22,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 259 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=523, Invalid=1547, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 15:45:22,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 15:45:22,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 78. [2020-07-21 15:45:22,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 15:45:22,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 103 transitions. [2020-07-21 15:45:22,882 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 103 transitions. Word has length 150 [2020-07-21 15:45:22,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:22,883 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 103 transitions. [2020-07-21 15:45:22,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:45:22,885 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 103 transitions. [2020-07-21 15:45:22,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 15:45:22,886 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:22,886 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 15:45:23,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:23,091 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:23,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:23,092 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 6 times [2020-07-21 15:45:23,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:23,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671055140] [2020-07-21 15:45:23,093 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:23,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:23,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 15:45:23,165 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 15:45:23,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 15:45:23,187 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 15:45:23,230 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 15:45:23,230 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 15:45:23,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:23,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 03:45:23 BoogieIcfgContainer [2020-07-21 15:45:23,478 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 15:45:23,480 INFO L168 Benchmark]: Toolchain (without parser) took 10708.51 ms. Allocated memory was 145.8 MB in the beginning and 321.9 MB in the end (delta: 176.2 MB). Free memory was 103.4 MB in the beginning and 145.9 MB in the end (delta: -42.5 MB). Peak memory consumption was 133.6 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:23,481 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 145.8 MB. Free memory was 122.0 MB in the beginning and 121.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 15:45:23,482 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.27 ms. Allocated memory is still 145.8 MB. Free memory was 103.0 MB in the beginning and 93.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:23,483 INFO L168 Benchmark]: Boogie Preprocessor took 113.75 ms. Allocated memory was 145.8 MB in the beginning and 202.4 MB in the end (delta: 56.6 MB). Free memory was 93.5 MB in the beginning and 181.1 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:23,483 INFO L168 Benchmark]: RCFGBuilder took 239.12 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 169.9 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:23,484 INFO L168 Benchmark]: TraceAbstraction took 10072.38 ms. Allocated memory was 202.4 MB in the beginning and 321.9 MB in the end (delta: 119.5 MB). Free memory was 169.2 MB in the beginning and 145.9 MB in the end (delta: 23.3 MB). Peak memory consumption was 142.8 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:23,488 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 145.8 MB. Free memory was 122.0 MB in the beginning and 121.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 277.27 ms. Allocated memory is still 145.8 MB. Free memory was 103.0 MB in the beginning and 93.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.75 ms. Allocated memory was 145.8 MB in the beginning and 202.4 MB in the end (delta: 56.6 MB). Free memory was 93.5 MB in the beginning and 181.1 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 239.12 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 169.9 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10072.38 ms. Allocated memory was 202.4 MB in the beginning and 321.9 MB in the end (delta: 119.5 MB). Free memory was 169.2 MB in the beginning and 145.9 MB in the end (delta: 23.3 MB). Peak memory consumption was 142.8 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: 9.9s, OverallIterations: 9, TraceHistogramMax: 21, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 547 SDslu, 586 SDs, 0 SdLazy, 785 SolverSat, 608 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1003 GetRequests, 809 SyntacticMatches, 58 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred in iteration=8, 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, 8 MinimizatonAttempts, 22 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 5.0s InterpolantComputationTime, 596 NumberOfCodeBlocks, 400 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 933 ConstructedInterpolants, 0 QuantifiedInterpolants, 187057 SizeOfPredicates, 44 NumberOfNonLiveVariables, 830 ConjunctsInSsa, 76 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 2540/4080 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...