/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:22:52,656 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:22:52,659 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:22:52,678 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:22:52,678 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:22:52,680 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:22:52,682 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:22:52,694 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:22:52,696 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:22:52,696 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:22:52,697 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:22:52,698 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:22:52,699 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:22:52,700 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:22:52,701 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:22:52,702 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:22:52,703 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:22:52,704 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:22:52,705 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:22:52,707 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:22:52,708 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:22:52,709 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:22:52,711 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:22:52,711 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:22:52,714 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:22:52,721 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:22:52,722 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:22:52,722 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:22:52,723 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 [2020-07-20 22:22:52,737 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:22:52,738 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:22:52,739 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:22:52,739 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:22:52,739 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:22:52,740 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:22:52,740 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:22:52,740 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:22:52,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:22:52,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:22:52,741 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:22:52,741 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:22:52,741 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:22:52,741 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:22:52,741 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:22:52,741 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:22:52,742 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:22:52,742 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:22:52,742 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:22:52,742 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:22:52,743 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:22:52,743 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:22:52,743 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:22:52,743 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:22:52,743 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:22:52,744 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:22:52,744 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:22:52,744 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:22:52,744 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:22:52,744 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 -> 4 [2020-07-20 22:22:53,027 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:22:53,041 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:22:53,045 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:22:53,046 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:22:53,047 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:22:53,047 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-07-20 22:22:53,111 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b115f39f/6d748449647e41de8e57ae2e7f64d694/FLAG75de7578b [2020-07-20 22:22:53,541 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:22:53,542 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-07-20 22:22:53,548 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b115f39f/6d748449647e41de8e57ae2e7f64d694/FLAG75de7578b [2020-07-20 22:22:53,934 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b115f39f/6d748449647e41de8e57ae2e7f64d694 [2020-07-20 22:22:53,943 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:22:53,945 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:22:53,946 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:22:53,946 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:22:53,950 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:22:53,951 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:22:53" (1/1) ... [2020-07-20 22:22:53,954 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15875eaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:53, skipping insertion in model container [2020-07-20 22:22:53,954 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:22:53" (1/1) ... [2020-07-20 22:22:53,963 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:22:53,976 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:22:54,148 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:22:54,154 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:22:54,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:22:54,185 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:22:54,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54 WrapperNode [2020-07-20 22:22:54,186 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:22:54,187 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:22:54,187 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:22:54,187 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:22:54,203 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (1/1) ... [2020-07-20 22:22:54,204 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (1/1) ... [2020-07-20 22:22:54,209 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (1/1) ... [2020-07-20 22:22:54,210 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (1/1) ... [2020-07-20 22:22:54,214 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (1/1) ... [2020-07-20 22:22:54,220 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (1/1) ... [2020-07-20 22:22:54,221 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (1/1) ... [2020-07-20 22:22:54,334 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:22:54,335 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:22:54,335 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:22:54,335 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:22:54,339 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (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 [2020-07-20 22:22:54,419 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:22:54,419 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:22:54,420 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:22:54,420 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:22:54,420 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:22:54,421 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:22:54,421 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:22:54,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:22:54,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:22:54,590 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:22:54,590 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:22:54,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:22:54 BoogieIcfgContainer [2020-07-20 22:22:54,594 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:22:54,595 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:22:54,595 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:22:54,599 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:22:54,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:22:53" (1/3) ... [2020-07-20 22:22:54,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fdaff76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:22:54, skipping insertion in model container [2020-07-20 22:22:54,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:22:54" (2/3) ... [2020-07-20 22:22:54,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fdaff76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:22:54, skipping insertion in model container [2020-07-20 22:22:54,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:22:54" (3/3) ... [2020-07-20 22:22:54,603 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-07-20 22:22:54,615 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:22:54,622 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:22:54,638 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:22:54,661 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:22:54,661 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:22:54,662 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:22:54,662 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:22:54,662 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:22:54,662 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:22:54,662 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:22:54,663 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:22:54,683 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-20 22:22:54,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 22:22:54,689 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:22:54,691 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:22:54,691 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:22:54,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:22:54,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-20 22:22:54,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:22:54,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005708652] [2020-07-20 22:22:54,709 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 [2020-07-20 22:22:54,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:22:54,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:22:54,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 9 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 22:22:54,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:22:54,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:54,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:22:54,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005708652] [2020-07-20 22:22:54,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:22:54,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:22:54,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870365372] [2020-07-20 22:22:54,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:22:54,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:22:54,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:22:54,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:22:54,865 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-20 22:22:54,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:22:54,904 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-20 22:22:54,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:22:54,907 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 22:22:54,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:22:54,916 INFO L225 Difference]: With dead ends: 29 [2020-07-20 22:22:54,916 INFO L226 Difference]: Without dead ends: 12 [2020-07-20 22:22:54,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:22:54,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-20 22:22:54,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-20 22:22:54,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-20 22:22:54,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-20 22:22:54,963 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-20 22:22:54,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:22:54,963 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-20 22:22:54,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:22:54,964 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-20 22:22:54,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 22:22:54,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:22:54,965 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:22:55,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:22:55,180 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:22:55,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:22:55,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-20 22:22:55,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:22:55,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616043849] [2020-07-20 22:22:55,184 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 [2020-07-20 22:22:55,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:22:55,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:22:55,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 16 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:22:55,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:22:55,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:55,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:22:55,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:55,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616043849] [2020-07-20 22:22:55,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:22:55,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 22:22:55,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129508903] [2020-07-20 22:22:55,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:22:55,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:22:55,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:22:55,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:22:55,336 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-20 22:22:55,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:22:55,403 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-20 22:22:55,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 22:22:55,404 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-20 22:22:55,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:22:55,405 INFO L225 Difference]: With dead ends: 20 [2020-07-20 22:22:55,406 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 22:22:55,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-20 22:22:55,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 22:22:55,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 22:22:55,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 22:22:55,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-20 22:22:55,413 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-20 22:22:55,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:22:55,413 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-20 22:22:55,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:22:55,414 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-20 22:22:55,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 22:22:55,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:22:55,415 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:22:55,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:22:55,631 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:22:55,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:22:55,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-20 22:22:55,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:22:55,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370189532] [2020-07-20 22:22:55,633 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 [2020-07-20 22:22:55,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:22:55,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:22:55,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 22:22:55,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:22:55,736 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:55,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:22:55,906 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:55,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370189532] [2020-07-20 22:22:55,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:22:55,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 22:22:55,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435240638] [2020-07-20 22:22:55,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 22:22:55,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:22:55,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 22:22:55,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:22:55,910 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-20 22:22:56,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:22:56,263 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-07-20 22:22:56,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 22:22:56,264 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-20 22:22:56,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:22:56,265 INFO L225 Difference]: With dead ends: 26 [2020-07-20 22:22:56,265 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 22:22:56,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=166, Unknown=0, NotChecked=0, Total=272 [2020-07-20 22:22:56,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 22:22:56,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 22:22:56,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 22:22:56,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-20 22:22:56,274 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-20 22:22:56,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:22:56,275 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-20 22:22:56,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 22:22:56,275 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-20 22:22:56,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 22:22:56,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:22:56,276 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:22:56,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:22:56,483 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:22:56,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:22:56,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 3 times [2020-07-20 22:22:56,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:22:56,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140279621] [2020-07-20 22:22:56,486 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 [2020-07-20 22:22:56,640 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:22:56,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:22:56,641 WARN L261 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 22:22:56,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:22:56,790 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:56,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:22:57,199 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:57,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140279621] [2020-07-20 22:22:57,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:22:57,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 22:22:57,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23974407] [2020-07-20 22:22:57,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 22:22:57,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:22:57,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 22:22:57,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:22:57,205 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2020-07-20 22:23:03,129 WARN L193 SmtUtils]: Spent 5.61 s on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 22:23:11,085 WARN L193 SmtUtils]: Spent 7.79 s on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 22:23:15,913 WARN L193 SmtUtils]: Spent 4.47 s on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 22:23:17,263 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 22:23:17,557 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 22:23:23,340 WARN L193 SmtUtils]: Spent 5.07 s on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 22:23:23,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:23:23,343 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-20 22:23:23,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 22:23:23,343 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-07-20 22:23:23,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:23:23,344 INFO L225 Difference]: With dead ends: 38 [2020-07-20 22:23:23,345 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 22:23:23,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 26.2s TimeCoverageRelationStatistics Valid=430, Invalid=760, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 22:23:23,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 22:23:23,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 22:23:23,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 22:23:23,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-20 22:23:23,358 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-20 22:23:23,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:23:23,358 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-20 22:23:23,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 22:23:23,359 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-20 22:23:23,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 22:23:23,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:23:23,360 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:23:23,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:23:23,564 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:23:23,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:23:23,565 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 4 times [2020-07-20 22:23:23,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:23:23,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318516206] [2020-07-20 22:23:23,566 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