/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-simple/id_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:58:57,815 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:58:57,819 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:58:57,839 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 00:58:57,857 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:58:57,860 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:58:57,862 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:58:57,864 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:58:57,866 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:58:57,868 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:58:57,871 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:58:57,874 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:58:57,877 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:58:57,879 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:58:57,881 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:58:57,883 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:58:57,889 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:58:57,934 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 00:58:57,986 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:58:57,987 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:58:57,992 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:58:57,992 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:58:57,992 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:58:57,993 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:58:57,993 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:58:57,993 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:58:57,993 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:58:57,994 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:58:57,995 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:58:57,996 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:58:57,996 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:58:57,997 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:58:57,997 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:58:57,997 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:58:57,998 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:58:57,998 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:58:57,998 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:58:57,998 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:58:57,998 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:58:57,999 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:58:57,999 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:58:57,999 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:58:57,999 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:58:57,999 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:58:58,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:58:58,000 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:58:58,000 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:58:58,000 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 00:58:58,363 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:58:58,392 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:58:58,397 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:58:58,400 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:58:58,401 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:58:58,402 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-07-21 00:58:58,511 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/112df793a/217f143513df42b689a9fe265deed093/FLAG0cd3ebbe6 [2020-07-21 00:58:59,125 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:58:59,126 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-07-21 00:58:59,136 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/112df793a/217f143513df42b689a9fe265deed093/FLAG0cd3ebbe6 [2020-07-21 00:58:59,500 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/112df793a/217f143513df42b689a9fe265deed093 [2020-07-21 00:58:59,514 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:58:59,518 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:58:59,520 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:58:59,520 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:58:59,525 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:58:59,527 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,532 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@566a226c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59, skipping insertion in model container [2020-07-21 00:58:59,533 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,543 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:58:59,566 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:58:59,770 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:58:59,777 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:58:59,797 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:58:59,818 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:58:59,819 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59 WrapperNode [2020-07-21 00:58:59,820 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:58:59,821 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:58:59,822 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:58:59,822 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:58:59,843 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,844 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,851 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,852 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,856 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,858 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,859 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (1/1) ... [2020-07-21 00:58:59,861 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:58:59,862 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:58:59,862 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:58:59,862 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:58:59,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (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 00:59:00,052 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:59:00,052 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:59:00,052 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 00:59:00,053 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:59:00,053 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:59:00,055 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:59:00,055 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 00:59:00,055 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:59:00,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:59:00,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:59:00,278 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:59:00,279 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:59:00,284 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:59:00 BoogieIcfgContainer [2020-07-21 00:59:00,285 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:59:00,286 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:59:00,287 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:59:00,291 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:59:00,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:58:59" (1/3) ... [2020-07-21 00:59:00,293 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69594030 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:59:00, skipping insertion in model container [2020-07-21 00:59:00,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:58:59" (2/3) ... [2020-07-21 00:59:00,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69594030 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:59:00, skipping insertion in model container [2020-07-21 00:59:00,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:59:00" (3/3) ... [2020-07-21 00:59:00,296 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i5_o5-1.c [2020-07-21 00:59:00,312 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:59:00,326 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:59:00,345 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:59:00,375 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:59:00,375 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:59:00,375 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:59:00,376 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:59:00,376 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:59:00,376 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:59:00,376 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:59:00,376 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:59:00,398 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 00:59:00,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:59:00,408 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:59:00,410 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:59:00,411 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:59:00,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:59:00,418 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 00:59:00,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:59:00,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577064977] [2020-07-21 00:59:00,431 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 00:59:00,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:59:00,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:59:00,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:59:00,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:59:00,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:59:00,734 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:59:00,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577064977] [2020-07-21 00:59:00,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:59:00,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:59:00,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440820632] [2020-07-21 00:59:00,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:59:00,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:59:00,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:59:00,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:59:00,772 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 00:59:00,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:59:00,890 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 00:59:00,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:59:00,894 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:59:00,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:59:00,910 INFO L225 Difference]: With dead ends: 30 [2020-07-21 00:59:00,910 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 00:59:00,915 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 00:59:00,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 00:59:00,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 00:59:00,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 00:59:00,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 00:59:00,984 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 00:59:00,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:59:00,985 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 00:59:00,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:59:00,986 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 00:59:00,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 00:59:00,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:59:00,989 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:59:01,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:59:01,205 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:59:01,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:59:01,206 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 00:59:01,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:59:01,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440341809] [2020-07-21 00:59:01,210 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 00:59:01,248 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:59:01,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:59:01,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:59:01,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:59:01,333 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:59:01,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:59:01,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:01,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:01,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:59:01,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440341809] [2020-07-21 00:59:01,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:59:01,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:59:01,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936104919] [2020-07-21 00:59:01,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:59:01,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:59:01,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:59:01,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:59:01,701 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 00:59:01,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:59:01,825 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 00:59:01,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:59:01,827 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 00:59:01,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:59:01,829 INFO L225 Difference]: With dead ends: 25 [2020-07-21 00:59:01,829 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:59:01,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:59:01,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:59:01,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:59:01,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:59:01,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 00:59:01,843 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 00:59:01,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:59:01,844 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 00:59:01,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:59:01,844 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 00:59:01,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 00:59:01,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:59:01,846 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:59:02,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:59:02,061 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:59:02,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:59:02,062 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-21 00:59:02,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:59:02,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267249362] [2020-07-21 00:59:02,064 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 00:59:02,132 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:59:02,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:59:02,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:59:02,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:59:02,255 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 00:59:02,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:59:02,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:02,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:02,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:02,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:02,770 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:59:02,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267249362] [2020-07-21 00:59:02,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:59:02,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:59:02,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439164124] [2020-07-21 00:59:02,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:59:02,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:59:02,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:59:02,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:59:02,781 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 00:59:02,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:59:02,937 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 00:59:02,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:59:02,939 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 00:59:02,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:59:02,943 INFO L225 Difference]: With dead ends: 28 [2020-07-21 00:59:02,943 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 00:59:02,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:59:02,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 00:59:02,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 00:59:02,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 00:59:02,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 00:59:02,969 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 00:59:02,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:59:02,971 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 00:59:02,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:59:02,972 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 00:59:02,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 00:59:02,975 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:59:02,976 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:59:03,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:59:03,192 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:59:03,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:59:03,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-21 00:59:03,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:59:03,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607988213] [2020-07-21 00:59:03,194 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 00:59:03,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:59:03,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:59:03,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:59:03,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:59:03,322 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 00:59:03,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:59:03,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:03,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:04,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:04,078 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 00:59:04,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607988213] [2020-07-21 00:59:04,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:59:04,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:59:04,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518655725] [2020-07-21 00:59:04,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:59:04,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:59:04,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:59:04,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:59:04,081 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 00:59:04,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:59:04,173 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 00:59:04,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:59:04,174 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 00:59:04,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:59:04,176 INFO L225 Difference]: With dead ends: 31 [2020-07-21 00:59:04,176 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 00:59:04,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:59:04,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 00:59:04,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 00:59:04,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 00:59:04,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 00:59:04,183 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 00:59:04,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:59:04,183 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 00:59:04,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:59:04,184 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 00:59:04,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 00:59:04,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:59:04,185 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:59:04,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:59:04,399 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:59:04,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:59:04,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-21 00:59:04,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:59:04,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488298285] [2020-07-21 00:59:04,402 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 00:59:04,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:59:04,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:59:04,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:59:04,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:59:04,503 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 00:59:04,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:59:05,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:59:05,539 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 00:59:05,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488298285] [2020-07-21 00:59:05,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:59:05,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 00:59:05,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733531999] [2020-07-21 00:59:05,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:59:05,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:59:05,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:59:05,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:59:05,544 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 14 states. [2020-07-21 00:59:05,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:59:05,678 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 00:59:05,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:59:05,685 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-07-21 00:59:05,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:59:05,687 INFO L225 Difference]: With dead ends: 34 [2020-07-21 00:59:05,689 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 00:59:05,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:59:05,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 00:59:05,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 00:59:05,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:59:05,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 00:59:05,701 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 00:59:05,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:59:05,702 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 00:59:05,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:59:05,704 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 00:59:05,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 00:59:05,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:59:05,706 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:59:05,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:59:05,914 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:59:05,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:59:05,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-21 00:59:05,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:59:05,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [656360014] [2020-07-21 00:59:05,917 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 00:59:05,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:59:05,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 00:59:05,970 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:59:05,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 00:59:05,982 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:59:05,999 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 00:59:06,000 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 00:59:06,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:59:06,243 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:59:06 BoogieIcfgContainer [2020-07-21 00:59:06,243 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:59:06,246 INFO L168 Benchmark]: Toolchain (without parser) took 6728.99 ms. Allocated memory was 136.3 MB in the beginning and 249.6 MB in the end (delta: 113.2 MB). Free memory was 100.3 MB in the beginning and 156.8 MB in the end (delta: -56.5 MB). Peak memory consumption was 56.8 MB. Max. memory is 7.1 GB. [2020-07-21 00:59:06,247 INFO L168 Benchmark]: CDTParser took 1.21 ms. Allocated memory is still 136.3 MB. Free memory is still 117.8 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 00:59:06,248 INFO L168 Benchmark]: CACSL2BoogieTranslator took 300.99 ms. Allocated memory is still 136.3 MB. Free memory was 99.9 MB in the beginning and 90.9 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-07-21 00:59:06,251 INFO L168 Benchmark]: Boogie Preprocessor took 40.10 ms. Allocated memory is still 136.3 MB. Free memory was 90.9 MB in the beginning and 89.2 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. [2020-07-21 00:59:06,253 INFO L168 Benchmark]: RCFGBuilder took 423.05 ms. Allocated memory was 136.3 MB in the beginning and 202.4 MB in the end (delta: 66.1 MB). Free memory was 89.2 MB in the beginning and 171.6 MB in the end (delta: -82.3 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 00:59:06,254 INFO L168 Benchmark]: TraceAbstraction took 5956.88 ms. Allocated memory was 202.4 MB in the beginning and 249.6 MB in the end (delta: 47.2 MB). Free memory was 170.6 MB in the beginning and 156.8 MB in the end (delta: 13.8 MB). Peak memory consumption was 61.0 MB. Max. memory is 7.1 GB. [2020-07-21 00:59:06,260 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.21 ms. Allocated memory is still 136.3 MB. Free memory is still 117.8 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 300.99 ms. Allocated memory is still 136.3 MB. Free memory was 99.9 MB in the beginning and 90.9 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 40.10 ms. Allocated memory is still 136.3 MB. Free memory was 90.9 MB in the beginning and 89.2 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 423.05 ms. Allocated memory was 136.3 MB in the beginning and 202.4 MB in the end (delta: 66.1 MB). Free memory was 89.2 MB in the beginning and 171.6 MB in the end (delta: -82.3 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5956.88 ms. Allocated memory was 202.4 MB in the beginning and 249.6 MB in the end (delta: 47.2 MB). Free memory was 170.6 MB in the beginning and 156.8 MB in the end (delta: 13.8 MB). Peak memory consumption was 61.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 5; VAL [input=5] [L11] CALL, EXPR id(input) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=5, input=5] [L11] int result = id(input); [L12] COND TRUE result == 5 VAL [input=5, result=5] [L13] __VERIFIER_error() VAL [input=5, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.8s, OverallIterations: 6, TraceHistogramMax: 6, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 69 SDtfs, 128 SDslu, 256 SDs, 0 SdLazy, 140 SolverSat, 41 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 247 GetRequests, 161 SyntacticMatches, 29 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.1s InterpolantComputationTime, 168 NumberOfCodeBlocks, 124 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 228 ConstructedInterpolants, 0 QuantifiedInterpolants, 16992 SizeOfPredicates, 20 NumberOfNonLiveVariables, 203 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 70/200 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...