/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 DAGSIZE --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/recHanoi03-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:18:34,005 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 19:18:34,026 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:18:34,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:18:34,029 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:18:34,031 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:18:34,032 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:18:34,033 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:18:34,034 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:18:34,035 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:18:34,036 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:18:34,037 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:18:34,038 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:18:34,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:18:34,040 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:18:34,041 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:18:34,042 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:18:34,044 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:18:34,046 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:18:34,047 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:18:34,048 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:18:34,049 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:18:34,052 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:18:34,060 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:18:34,061 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:18:34,062 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:18:34,063 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 19:18:34,079 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:18:34,079 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:18:34,080 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:18:34,081 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:18:34,081 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:18:34,081 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:18:34,081 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:18:34,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:18:34,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:18:34,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:18:34,082 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:18:34,082 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:18:34,082 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:18:34,083 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:18:34,083 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:18:34,083 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:18:34,083 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:18:34,083 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:18:34,084 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:18:34,084 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:18:34,086 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:18:34,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:18:34,087 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:18:34,087 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:18:34,087 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:18:34,087 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:18:34,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:18:34,088 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:18:34,088 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:18:34,088 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 -> DAGSIZE 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 19:18:34,367 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:18:34,387 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:18:34,391 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:18:34,392 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:18:34,393 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:18:34,395 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-21 19:18:34,470 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dac35cc2/ea85094744d34ed5baff5f154c657fae/FLAGf4f591084 [2020-07-21 19:18:34,975 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:18:34,976 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-21 19:18:34,983 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dac35cc2/ea85094744d34ed5baff5f154c657fae/FLAGf4f591084 [2020-07-21 19:18:35,298 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dac35cc2/ea85094744d34ed5baff5f154c657fae [2020-07-21 19:18:35,309 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:18:35,312 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:18:35,313 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:18:35,313 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:18:35,317 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:18:35,318 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@376da73e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35, skipping insertion in model container [2020-07-21 19:18:35,322 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,330 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:18:35,348 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:18:35,524 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:18:35,529 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:18:35,545 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:18:35,561 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:18:35,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35 WrapperNode [2020-07-21 19:18:35,562 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:18:35,563 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:18:35,563 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:18:35,563 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:18:35,574 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,574 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,579 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,579 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,583 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,586 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,587 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (1/1) ... [2020-07-21 19:18:35,588 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:18:35,589 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:18:35,589 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:18:35,589 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:18:35,590 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (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 19:18:35,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:18:35,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:18:35,751 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2020-07-21 19:18:35,751 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:18:35,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:18:35,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:18:35,751 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2020-07-21 19:18:35,751 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:18:35,752 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:18:35,752 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:18:35,925 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:18:35,925 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:18:35,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:18:35 BoogieIcfgContainer [2020-07-21 19:18:35,930 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:18:35,931 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:18:35,931 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:18:35,934 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:18:35,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:18:35" (1/3) ... [2020-07-21 19:18:35,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dae11ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:18:35, skipping insertion in model container [2020-07-21 19:18:35,936 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:18:35" (2/3) ... [2020-07-21 19:18:35,937 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dae11ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:18:35, skipping insertion in model container [2020-07-21 19:18:35,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:18:35" (3/3) ... [2020-07-21 19:18:35,939 INFO L109 eAbstractionObserver]: Analyzing ICFG recHanoi03-2.c [2020-07-21 19:18:35,950 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:18:35,958 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:18:35,972 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:18:35,996 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:18:35,996 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:18:35,996 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:18:35,996 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:18:35,997 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:18:35,997 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:18:35,997 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:18:35,997 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:18:36,016 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 19:18:36,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:18:36,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:18:36,025 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:18:36,025 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:18:36,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:18:36,032 INFO L82 PathProgramCache]: Analyzing trace with hash 913793727, now seen corresponding path program 1 times [2020-07-21 19:18:36,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:18:36,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474593952] [2020-07-21 19:18:36,042 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 19:18:36,113 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:18:36,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:18:36,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:18:36,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:18:36,314 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 19:18:36,315 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:18:36,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474593952] [2020-07-21 19:18:36,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:18:36,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:18:36,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506358728] [2020-07-21 19:18:36,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:18:36,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:18:36,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:18:36,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:18:36,345 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 6 states. [2020-07-21 19:18:36,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:18:36,499 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-07-21 19:18:36,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:18:36,502 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 19:18:36,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:18:36,514 INFO L225 Difference]: With dead ends: 33 [2020-07-21 19:18:36,514 INFO L226 Difference]: Without dead ends: 19 [2020-07-21 19:18:36,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:18:36,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-21 19:18:36,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-21 19:18:36,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-21 19:18:36,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-07-21 19:18:36,567 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2020-07-21 19:18:36,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:18:36,568 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-07-21 19:18:36,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:18:36,568 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-07-21 19:18:36,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:18:36,570 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:18:36,571 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:18:36,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:18:36,785 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:18:36,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:18:36,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1998834103, now seen corresponding path program 1 times [2020-07-21 19:18:36,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:18:36,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665799523] [2020-07-21 19:18:36,788 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 19:18:36,824 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:18:36,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:18:36,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 19:18:36,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:18:37,000 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 19:18:37,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:18:37,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:18:37,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:19:05,505 WARN L193 SmtUtils]: Spent 9.40 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 19:19:20,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:19:22,440 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 19:19:22,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665799523] [2020-07-21 19:19:22,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:19:22,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2020-07-21 19:19:22,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370189532] [2020-07-21 19:19:22,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:19:22,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:19:22,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:19:22,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=160, Unknown=11, NotChecked=0, Total=210 [2020-07-21 19:19:22,448 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 15 states. [2020-07-21 19:19:28,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:19:28,984 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2020-07-21 19:19:28,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:19:28,986 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 20 [2020-07-21 19:19:28,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:19:28,987 INFO L225 Difference]: With dead ends: 31 [2020-07-21 19:19:28,987 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 19:19:28,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 51.5s TimeCoverageRelationStatistics Valid=76, Invalid=290, Unknown=14, NotChecked=0, Total=380 [2020-07-21 19:19:28,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 19:19:28,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-21 19:19:28,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 19:19:28,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-07-21 19:19:28,995 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2020-07-21 19:19:28,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:19:28,995 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-07-21 19:19:28,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:19:28,996 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-07-21 19:19:28,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 19:19:28,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:19:28,997 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:19:29,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:19:29,202 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:19:29,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:19:29,203 INFO L82 PathProgramCache]: Analyzing trace with hash -547108535, now seen corresponding path program 2 times [2020-07-21 19:19:29,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:19:29,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938742318] [2020-07-21 19:19:29,204 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 19:19:29,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:19:29,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:19:29,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 19:19:29,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:19:33,833 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 19:19:33,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:19:34,626 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:19:35,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938742318] [2020-07-21 19:19:35,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:19:35,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-21 19:19:35,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663685713] [2020-07-21 19:19:35,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:19:35,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:19:35,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:19:35,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=222, Unknown=2, NotChecked=0, Total=272 [2020-07-21 19:19:35,534 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 12 states. [2020-07-21 19:19:41,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:19:41,241 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-07-21 19:19:41,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:19:41,244 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-07-21 19:19:41,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:19:41,246 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:19:41,246 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:19:41,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=90, Invalid=460, Unknown=2, NotChecked=0, Total=552 [2020-07-21 19:19:41,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:19:41,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 19:19:41,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 19:19:41,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-21 19:19:41,255 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 32 [2020-07-21 19:19:41,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:19:41,256 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-21 19:19:41,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:19:41,256 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-21 19:19:41,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 19:19:41,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:19:41,258 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:19:41,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:19:41,466 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:19:41,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:19:41,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1152432193, now seen corresponding path program 3 times [2020-07-21 19:19:41,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:19:41,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085005974] [2020-07-21 19:19:41,470 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 19:19:41,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:19:41,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:19:41,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 19:19:41,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:06,952 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 19:20:06,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:20:08,114 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:20:08,245 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 19:20:08,361 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 19:20:09,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085005974] [2020-07-21 19:20:09,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:20:09,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-21 19:20:09,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133005170] [2020-07-21 19:20:09,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:20:09,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:09,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:20:09,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=274, Unknown=12, NotChecked=0, Total=342 [2020-07-21 19:20:09,526 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2020-07-21 19:20:46,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:46,262 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2020-07-21 19:20:46,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:20:46,266 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-07-21 19:20:46,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:46,270 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:20:46,270 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 19:20:46,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 49.0s TimeCoverageRelationStatistics Valid=110, Invalid=628, Unknown=18, NotChecked=0, Total=756 [2020-07-21 19:20:46,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 19:20:46,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 19:20:46,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:20:46,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-07-21 19:20:46,278 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 38 [2020-07-21 19:20:46,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:46,278 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-07-21 19:20:46,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:20:46,279 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-07-21 19:20:46,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 19:20:46,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:46,280 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:46,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:46,482 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:46,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:46,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1461718089, now seen corresponding path program 4 times [2020-07-21 19:20:46,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:46,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411523585] [2020-07-21 19:20:46,483 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 19:20:46,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:46,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:46,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 19:20:46,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:21:43,303 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 19:21:43,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:21:44,409 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:21:44,522 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:21:44,655 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:21:44,785 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:21:44,934 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:21:45,080 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:21:45,251 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:21:45,415 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:21:45,596 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:21:45,783 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:21:45,982 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:21:46,177 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:21:47,322 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:21:47,435 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:21:47,567 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:21:47,694 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:21:47,842 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:21:48,003 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:21:48,166 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:21:48,327 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:21:48,437 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 19:21:48,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411523585] [2020-07-21 19:21:48,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:21:48,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-21 19:21:48,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284672966] [2020-07-21 19:21:48,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:21:48,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:21:48,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:21:48,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=330, Unknown=26, NotChecked=0, Total=420 [2020-07-21 19:21:48,703 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2020-07-21 19:24:06,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:24:06,196 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-21 19:24:06,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:24:06,206 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2020-07-21 19:24:06,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:24:06,207 INFO L225 Difference]: With dead ends: 38 [2020-07-21 19:24:06,207 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 19:24:06,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 131.4s TimeCoverageRelationStatistics Valid=130, Invalid=818, Unknown=44, NotChecked=0, Total=992 [2020-07-21 19:24:06,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 19:24:06,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-21 19:24:06,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 19:24:06,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-07-21 19:24:06,215 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 44 [2020-07-21 19:24:06,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:24:06,216 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-07-21 19:24:06,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:24:06,216 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-07-21 19:24:06,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-21 19:24:06,217 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:24:06,217 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:24:06,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:24:06,427 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:24:06,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:24:06,428 INFO L82 PathProgramCache]: Analyzing trace with hash -269168065, now seen corresponding path program 5 times [2020-07-21 19:24:06,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:24:06,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064987307] [2020-07-21 19:24:06,429 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 19:24:06,496 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:24:06,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:24:06,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 19:24:06,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:26:08,670 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:26:08,713 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 19:26:08,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:26:09,626 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 19:26:09,742 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 19:26:09,874 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 19:26:10,006 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 19:26:10,159 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 19:26:10,314 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 19:26:10,498 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:26:10,676 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:26:10,876 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:26:11,080 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:26:11,307 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:26:11,533 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:26:11,783 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:26:12,040 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:26:12,318 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:26:12,593 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:26:12,892 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 19:26:13,192 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 19:26:13,550 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 19:26:13,880 WARN L193 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 19:26:14,243 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 19:26:14,593 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 19:26:15,537 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 19:26:15,648 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 19:26:15,786 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 19:26:15,926 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 19:26:16,081 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 19:26:16,231 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 19:26:16,401 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 19:26:16,557 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 19:26:16,735 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:26:16,915 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:26:17,120 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:26:17,333 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:26:17,557 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:26:17,785 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:26:18,041 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:26:18,293 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:26:18,571 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:26:18,848 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:26:19,153 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 19:26:19,449 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 19:26:19,650 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:26:19,833 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 19:26:20,003 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 19:26:20,164 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 19:26:20,296 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:26:20,416 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 19:26:20,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064987307] [2020-07-21 19:26:20,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:26:20,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-21 19:26:20,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739550883] [2020-07-21 19:26:20,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:26:20,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:26:20,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:26:20,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=383, Unknown=51, NotChecked=0, Total=506 [2020-07-21 19:26:20,737 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 18 states. [2020-07-21 19:31:22,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:22,675 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2020-07-21 19:31:22,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 19:31:22,690 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-07-21 19:31:22,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:22,691 INFO L225 Difference]: With dead ends: 41 [2020-07-21 19:31:22,691 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 19:31:22,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 281.1s TimeCoverageRelationStatistics Valid=150, Invalid=1015, Unknown=95, NotChecked=0, Total=1260 [2020-07-21 19:31:22,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 19:31:22,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-21 19:31:22,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 19:31:22,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-07-21 19:31:22,699 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 50 [2020-07-21 19:31:22,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:22,699 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-07-21 19:31:22,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:31:22,699 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-07-21 19:31:22,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 19:31:22,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:22,701 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:22,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:22,917 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:22,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:22,918 INFO L82 PathProgramCache]: Analyzing trace with hash 585432905, now seen corresponding path program 6 times [2020-07-21 19:31:22,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:22,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94470658] [2020-07-21 19:31:22,919 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 19:31:23,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:23,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:23,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 19:31:23,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:45,273 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 35