/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_9.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:12:32,825 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:12:32,828 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:12:32,843 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 17:12:32,854 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:12:32,855 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:12:32,856 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:12:32,858 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:12:32,859 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:12:32,860 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:12:32,862 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:12:32,864 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:12:32,865 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:12:32,867 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:12:32,868 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:12:32,869 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:12:32,873 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:12:32,894 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 17:12:32,927 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:12:32,928 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:12:32,931 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:12:32,931 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:12:32,931 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:12:32,932 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:12:32,932 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:12:32,932 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:12:32,932 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:12:32,933 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:12:32,934 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:12:32,934 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:12:32,934 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:12:32,935 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:12:32,935 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:12:32,935 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:12:32,936 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:12:32,936 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:12:32,936 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:12:32,937 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:12:32,937 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:12:32,937 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:32,937 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:12:32,938 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:12:32,938 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:12:32,938 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:12:32,938 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,938 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:12:32,939 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:12:32,939 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:12:33,285 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:12:33,301 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:12:33,305 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:12:33,307 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:12:33,307 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:12:33,308 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_9.c [2020-07-20 17:12:33,379 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4e407fc93/2438726a6e1c444f847d3fe3fd67558f/FLAGd74866557 [2020-07-20 17:12:33,951 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:12:33,952 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_9.c [2020-07-20 17:12:33,966 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4e407fc93/2438726a6e1c444f847d3fe3fd67558f/FLAGd74866557 [2020-07-20 17:12:34,250 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4e407fc93/2438726a6e1c444f847d3fe3fd67558f [2020-07-20 17:12:34,264 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:12:34,268 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:12:34,270 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:34,270 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:12:34,275 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:12:34,276 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,280 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b0daa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34, skipping insertion in model container [2020-07-20 17:12:34,280 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,290 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:12:34,330 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:12:34,650 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:34,655 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:12:34,709 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:34,850 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:12:34,852 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34 WrapperNode [2020-07-20 17:12:34,852 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:34,854 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:12:34,854 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:12:34,854 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:12:34,867 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,867 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,875 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,876 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,882 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,895 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,898 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (1/1) ... [2020-07-20 17:12:34,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:12:34,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:12:34,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:12:34,902 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:12:34,904 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (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 17:12:34,976 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:12:34,977 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:12:34,977 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:12:34,977 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:12:34,977 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:12:34,977 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:12:34,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:12:34,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:12:35,325 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:12:35,326 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:12:35,331 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:35 BoogieIcfgContainer [2020-07-20 17:12:35,331 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:12:35,333 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:12:35,333 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:12:35,337 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:12:35,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:12:34" (1/3) ... [2020-07-20 17:12:35,339 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14bcb871 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:35, skipping insertion in model container [2020-07-20 17:12:35,339 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:34" (2/3) ... [2020-07-20 17:12:35,340 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14bcb871 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:35, skipping insertion in model container [2020-07-20 17:12:35,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:35" (3/3) ... [2020-07-20 17:12:35,343 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_9.c [2020-07-20 17:12:35,359 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:12:35,370 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:12:35,390 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:12:35,420 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:12:35,421 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:12:35,421 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:12:35,421 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:12:35,422 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:12:35,422 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:12:35,422 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:12:35,422 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:12:35,450 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-07-20 17:12:35,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:35,458 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:35,459 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:35,460 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:35,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:35,469 INFO L82 PathProgramCache]: Analyzing trace with hash 691982780, now seen corresponding path program 1 times [2020-07-20 17:12:35,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:35,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610468125] [2020-07-20 17:12:35,479 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 17:12:35,601 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:35,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:35,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:35,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:35,668 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 17:12:35,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:35,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610468125] [2020-07-20 17:12:35,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:35,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:35,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782499373] [2020-07-20 17:12:35,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:35,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:35,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:35,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:35,699 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 3 states. [2020-07-20 17:12:35,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:35,788 INFO L93 Difference]: Finished difference Result 81 states and 138 transitions. [2020-07-20 17:12:35,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:35,792 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:35,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:35,804 INFO L225 Difference]: With dead ends: 81 [2020-07-20 17:12:35,805 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 17:12:35,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:35,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 17:12:35,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-20 17:12:35,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 17:12:35,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 81 transitions. [2020-07-20 17:12:35,858 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 81 transitions. Word has length 19 [2020-07-20 17:12:35,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:35,859 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 81 transitions. [2020-07-20 17:12:35,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:35,859 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 81 transitions. [2020-07-20 17:12:35,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:35,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:35,861 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:36,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,063 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:36,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:36,065 INFO L82 PathProgramCache]: Analyzing trace with hash 950148218, now seen corresponding path program 1 times [2020-07-20 17:12:36,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:36,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896358158] [2020-07-20 17:12:36,067 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 17:12:36,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:36,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:36,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:36,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:36,157 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 17:12:36,158 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:36,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896358158] [2020-07-20 17:12:36,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:36,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:36,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177012596] [2020-07-20 17:12:36,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:36,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:36,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:36,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:36,166 INFO L87 Difference]: Start difference. First operand 46 states and 81 transitions. Second operand 3 states. [2020-07-20 17:12:36,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:36,212 INFO L93 Difference]: Finished difference Result 107 states and 192 transitions. [2020-07-20 17:12:36,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:36,215 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:36,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:36,219 INFO L225 Difference]: With dead ends: 107 [2020-07-20 17:12:36,219 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 17:12:36,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:36,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 17:12:36,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-07-20 17:12:36,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 17:12:36,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 113 transitions. [2020-07-20 17:12:36,247 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 113 transitions. Word has length 19 [2020-07-20 17:12:36,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:36,248 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 113 transitions. [2020-07-20 17:12:36,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:36,248 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 113 transitions. [2020-07-20 17:12:36,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:36,255 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:36,255 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:36,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,457 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:36,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:36,458 INFO L82 PathProgramCache]: Analyzing trace with hash -23156596, now seen corresponding path program 1 times [2020-07-20 17:12:36,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:36,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124811628] [2020-07-20 17:12:36,460 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 17:12:36,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:36,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:36,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:36,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:36,535 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 17:12:36,535 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:36,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124811628] [2020-07-20 17:12:36,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:36,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:36,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586603517] [2020-07-20 17:12:36,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:36,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:36,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:36,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:36,539 INFO L87 Difference]: Start difference. First operand 64 states and 113 transitions. Second operand 3 states. [2020-07-20 17:12:36,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:36,564 INFO L93 Difference]: Finished difference Result 99 states and 171 transitions. [2020-07-20 17:12:36,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:36,565 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:36,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:36,567 INFO L225 Difference]: With dead ends: 99 [2020-07-20 17:12:36,567 INFO L226 Difference]: Without dead ends: 69 [2020-07-20 17:12:36,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 17:12:36,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-20 17:12:36,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2020-07-20 17:12:36,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-20 17:12:36,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 115 transitions. [2020-07-20 17:12:36,580 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 115 transitions. Word has length 20 [2020-07-20 17:12:36,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:36,580 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 115 transitions. [2020-07-20 17:12:36,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:36,581 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 115 transitions. [2020-07-20 17:12:36,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:36,582 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:36,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:36,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,798 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:36,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:36,799 INFO L82 PathProgramCache]: Analyzing trace with hash -609962610, now seen corresponding path program 1 times [2020-07-20 17:12:36,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:36,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380704134] [2020-07-20 17:12:36,800 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 17:12:36,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:36,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:36,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:36,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:36,872 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 17:12:36,873 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:36,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380704134] [2020-07-20 17:12:36,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:36,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:36,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886790500] [2020-07-20 17:12:36,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:36,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:36,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:36,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:36,877 INFO L87 Difference]: Start difference. First operand 67 states and 115 transitions. Second operand 3 states. [2020-07-20 17:12:36,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:36,920 INFO L93 Difference]: Finished difference Result 124 states and 216 transitions. [2020-07-20 17:12:36,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:36,921 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:36,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:36,923 INFO L225 Difference]: With dead ends: 124 [2020-07-20 17:12:36,923 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 17:12:36,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 17:12:36,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 17:12:36,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 88. [2020-07-20 17:12:36,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-20 17:12:36,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 152 transitions. [2020-07-20 17:12:36,937 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 152 transitions. Word has length 20 [2020-07-20 17:12:36,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:36,938 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 152 transitions. [2020-07-20 17:12:36,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:36,938 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 152 transitions. [2020-07-20 17:12:36,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:36,939 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:36,940 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:37,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,142 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:37,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:37,143 INFO L82 PathProgramCache]: Analyzing trace with hash -351797172, now seen corresponding path program 1 times [2020-07-20 17:12:37,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:37,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1768824946] [2020-07-20 17:12:37,146 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:37,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,237 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 17:12:37,238 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1768824946] [2020-07-20 17:12:37,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:37,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:37,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364258307] [2020-07-20 17:12:37,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:37,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:37,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:37,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,241 INFO L87 Difference]: Start difference. First operand 88 states and 152 transitions. Second operand 3 states. [2020-07-20 17:12:37,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:37,266 INFO L93 Difference]: Finished difference Result 204 states and 358 transitions. [2020-07-20 17:12:37,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:37,266 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:37,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:37,268 INFO L225 Difference]: With dead ends: 204 [2020-07-20 17:12:37,269 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 17:12:37,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 17:12:37,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 17:12:37,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2020-07-20 17:12:37,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-20 17:12:37,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 210 transitions. [2020-07-20 17:12:37,283 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 210 transitions. Word has length 20 [2020-07-20 17:12:37,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:37,283 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 210 transitions. [2020-07-20 17:12:37,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:37,284 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 210 transitions. [2020-07-20 17:12:37,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:37,285 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:37,285 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:37,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,494 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:37,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:37,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1728757681, now seen corresponding path program 1 times [2020-07-20 17:12:37,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:37,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871737594] [2020-07-20 17:12:37,496 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,544 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:37,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,561 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 17:12:37,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871737594] [2020-07-20 17:12:37,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:37,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:37,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414711941] [2020-07-20 17:12:37,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:37,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:37,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:37,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,568 INFO L87 Difference]: Start difference. First operand 122 states and 210 transitions. Second operand 3 states. [2020-07-20 17:12:37,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:37,598 INFO L93 Difference]: Finished difference Result 183 states and 313 transitions. [2020-07-20 17:12:37,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:37,599 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:37,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:37,606 INFO L225 Difference]: With dead ends: 183 [2020-07-20 17:12:37,607 INFO L226 Difference]: Without dead ends: 126 [2020-07-20 17:12:37,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 17:12:37,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-20 17:12:37,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2020-07-20 17:12:37,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 17:12:37,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 210 transitions. [2020-07-20 17:12:37,637 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 210 transitions. Word has length 21 [2020-07-20 17:12:37,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:37,638 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 210 transitions. [2020-07-20 17:12:37,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:37,638 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 210 transitions. [2020-07-20 17:12:37,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:37,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:37,640 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:37,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,842 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:37,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:37,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1979403601, now seen corresponding path program 1 times [2020-07-20 17:12:37,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:37,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115693543] [2020-07-20 17:12:37,844 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:37,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,899 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 17:12:37,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115693543] [2020-07-20 17:12:37,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:37,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:37,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821013736] [2020-07-20 17:12:37,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:37,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:37,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:37,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,905 INFO L87 Difference]: Start difference. First operand 124 states and 210 transitions. Second operand 3 states. [2020-07-20 17:12:37,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:37,934 INFO L93 Difference]: Finished difference Result 228 states and 392 transitions. [2020-07-20 17:12:37,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:37,935 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:37,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:37,937 INFO L225 Difference]: With dead ends: 228 [2020-07-20 17:12:37,937 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 17:12:37,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 17:12:37,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 17:12:37,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 168. [2020-07-20 17:12:37,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-07-20 17:12:37,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 282 transitions. [2020-07-20 17:12:37,976 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 282 transitions. Word has length 21 [2020-07-20 17:12:37,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:37,976 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 282 transitions. [2020-07-20 17:12:37,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:37,977 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 282 transitions. [2020-07-20 17:12:37,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:37,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:37,982 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:38,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,184 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:38,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:38,185 INFO L82 PathProgramCache]: Analyzing trace with hash -2057398257, now seen corresponding path program 1 times [2020-07-20 17:12:38,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:38,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [235920587] [2020-07-20 17:12:38,186 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:38,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:38,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:38,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:38,245 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 17:12:38,246 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:38,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [235920587] [2020-07-20 17:12:38,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:38,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:38,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600296560] [2020-07-20 17:12:38,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:38,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:38,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:38,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,249 INFO L87 Difference]: Start difference. First operand 168 states and 282 transitions. Second operand 3 states. [2020-07-20 17:12:38,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:38,275 INFO L93 Difference]: Finished difference Result 392 states and 664 transitions. [2020-07-20 17:12:38,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:38,276 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:38,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:38,278 INFO L225 Difference]: With dead ends: 392 [2020-07-20 17:12:38,279 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 17:12:38,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 17:12:38,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 17:12:38,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2020-07-20 17:12:38,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-20 17:12:38,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 386 transitions. [2020-07-20 17:12:38,294 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 386 transitions. Word has length 21 [2020-07-20 17:12:38,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:38,295 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 386 transitions. [2020-07-20 17:12:38,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:38,295 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 386 transitions. [2020-07-20 17:12:38,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:38,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:38,297 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:38,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,511 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:38,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:38,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1232183873, now seen corresponding path program 1 times [2020-07-20 17:12:38,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:38,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573277819] [2020-07-20 17:12:38,514 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,556 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:38,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:38,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:38,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:38,580 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 17:12:38,580 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:38,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573277819] [2020-07-20 17:12:38,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:38,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:38,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480301824] [2020-07-20 17:12:38,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:38,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:38,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:38,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,588 INFO L87 Difference]: Start difference. First operand 232 states and 386 transitions. Second operand 3 states. [2020-07-20 17:12:38,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:38,625 INFO L93 Difference]: Finished difference Result 348 states and 576 transitions. [2020-07-20 17:12:38,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:38,626 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:38,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:38,631 INFO L225 Difference]: With dead ends: 348 [2020-07-20 17:12:38,631 INFO L226 Difference]: Without dead ends: 238 [2020-07-20 17:12:38,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 17:12:38,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2020-07-20 17:12:38,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 236. [2020-07-20 17:12:38,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 17:12:38,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 386 transitions. [2020-07-20 17:12:38,662 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 386 transitions. Word has length 22 [2020-07-20 17:12:38,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:38,662 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 386 transitions. [2020-07-20 17:12:38,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:38,663 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 386 transitions. [2020-07-20 17:12:38,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:38,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:38,670 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:38,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,888 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:38,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:38,888 INFO L82 PathProgramCache]: Analyzing trace with hash 645377859, now seen corresponding path program 1 times [2020-07-20 17:12:38,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:38,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987280721] [2020-07-20 17:12:38,889 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:38,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:38,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:38,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:38,957 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 17:12:38,957 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:38,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987280721] [2020-07-20 17:12:38,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:38,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:38,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729447394] [2020-07-20 17:12:38,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:38,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:38,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:38,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,960 INFO L87 Difference]: Start difference. First operand 236 states and 386 transitions. Second operand 3 states. [2020-07-20 17:12:38,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:38,986 INFO L93 Difference]: Finished difference Result 428 states and 712 transitions. [2020-07-20 17:12:38,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:38,987 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:38,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:38,990 INFO L225 Difference]: With dead ends: 428 [2020-07-20 17:12:38,991 INFO L226 Difference]: Without dead ends: 426 [2020-07-20 17:12:38,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 17:12:38,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2020-07-20 17:12:39,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 328. [2020-07-20 17:12:39,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2020-07-20 17:12:39,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 526 transitions. [2020-07-20 17:12:39,007 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 526 transitions. Word has length 22 [2020-07-20 17:12:39,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:39,007 INFO L479 AbstractCegarLoop]: Abstraction has 328 states and 526 transitions. [2020-07-20 17:12:39,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:39,007 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 526 transitions. [2020-07-20 17:12:39,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:39,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:39,009 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:39,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,224 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:39,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:39,224 INFO L82 PathProgramCache]: Analyzing trace with hash 903543297, now seen corresponding path program 1 times [2020-07-20 17:12:39,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:39,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [402608502] [2020-07-20 17:12:39,225 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:39,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:39,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:39,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:39,291 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 17:12:39,292 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:39,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [402608502] [2020-07-20 17:12:39,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:39,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:39,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374896126] [2020-07-20 17:12:39,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:39,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:39,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:39,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:39,295 INFO L87 Difference]: Start difference. First operand 328 states and 526 transitions. Second operand 3 states. [2020-07-20 17:12:39,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:39,341 INFO L93 Difference]: Finished difference Result 764 states and 1232 transitions. [2020-07-20 17:12:39,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:39,342 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:39,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:39,346 INFO L225 Difference]: With dead ends: 764 [2020-07-20 17:12:39,347 INFO L226 Difference]: Without dead ends: 450 [2020-07-20 17:12:39,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 17:12:39,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-20 17:12:39,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 448. [2020-07-20 17:12:39,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 448 states. [2020-07-20 17:12:39,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 710 transitions. [2020-07-20 17:12:39,381 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 710 transitions. Word has length 22 [2020-07-20 17:12:39,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:39,381 INFO L479 AbstractCegarLoop]: Abstraction has 448 states and 710 transitions. [2020-07-20 17:12:39,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:39,382 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 710 transitions. [2020-07-20 17:12:39,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:39,383 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:39,383 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:39,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,597 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:39,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:39,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1467908124, now seen corresponding path program 1 times [2020-07-20 17:12:39,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:39,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410794737] [2020-07-20 17:12:39,599 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,639 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:39,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:39,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:39,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:39,654 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 17:12:39,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:39,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410794737] [2020-07-20 17:12:39,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:39,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:39,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023343374] [2020-07-20 17:12:39,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:39,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:39,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:39,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:39,659 INFO L87 Difference]: Start difference. First operand 448 states and 710 transitions. Second operand 3 states. [2020-07-20 17:12:39,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:39,683 INFO L93 Difference]: Finished difference Result 672 states and 1060 transitions. [2020-07-20 17:12:39,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:39,683 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:39,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:39,687 INFO L225 Difference]: With dead ends: 672 [2020-07-20 17:12:39,687 INFO L226 Difference]: Without dead ends: 458 [2020-07-20 17:12:39,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 17:12:39,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2020-07-20 17:12:39,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 456. [2020-07-20 17:12:39,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-20 17:12:39,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 710 transitions. [2020-07-20 17:12:39,721 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 710 transitions. Word has length 23 [2020-07-20 17:12:39,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:39,721 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 710 transitions. [2020-07-20 17:12:39,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:39,721 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 710 transitions. [2020-07-20 17:12:39,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:39,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:39,725 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:39,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,940 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:39,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:39,941 INFO L82 PathProgramCache]: Analyzing trace with hash -2054714138, now seen corresponding path program 1 times [2020-07-20 17:12:39,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:39,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364854906] [2020-07-20 17:12:39,942 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:40,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:40,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:40,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:40,052 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 17:12:40,053 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:40,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364854906] [2020-07-20 17:12:40,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:40,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:40,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708012874] [2020-07-20 17:12:40,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:40,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:40,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:40,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:40,059 INFO L87 Difference]: Start difference. First operand 456 states and 710 transitions. Second operand 3 states. [2020-07-20 17:12:40,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:40,095 INFO L93 Difference]: Finished difference Result 812 states and 1288 transitions. [2020-07-20 17:12:40,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:40,096 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:40,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:40,103 INFO L225 Difference]: With dead ends: 812 [2020-07-20 17:12:40,103 INFO L226 Difference]: Without dead ends: 810 [2020-07-20 17:12:40,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 17:12:40,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-20 17:12:40,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 648. [2020-07-20 17:12:40,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 648 states. [2020-07-20 17:12:40,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 648 states to 648 states and 982 transitions. [2020-07-20 17:12:40,139 INFO L78 Accepts]: Start accepts. Automaton has 648 states and 982 transitions. Word has length 23 [2020-07-20 17:12:40,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:40,139 INFO L479 AbstractCegarLoop]: Abstraction has 648 states and 982 transitions. [2020-07-20 17:12:40,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:40,140 INFO L276 IsEmpty]: Start isEmpty. Operand 648 states and 982 transitions. [2020-07-20 17:12:40,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:40,142 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:40,143 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:40,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,357 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:40,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:40,358 INFO L82 PathProgramCache]: Analyzing trace with hash -1796548700, now seen corresponding path program 1 times [2020-07-20 17:12:40,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:40,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118332245] [2020-07-20 17:12:40,359 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:40,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:40,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:40,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:40,424 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 17:12:40,425 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:40,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118332245] [2020-07-20 17:12:40,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:40,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:40,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183865777] [2020-07-20 17:12:40,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:40,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:40,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:40,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:40,428 INFO L87 Difference]: Start difference. First operand 648 states and 982 transitions. Second operand 3 states. [2020-07-20 17:12:40,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:40,460 INFO L93 Difference]: Finished difference Result 1500 states and 2280 transitions. [2020-07-20 17:12:40,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:40,460 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:40,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:40,467 INFO L225 Difference]: With dead ends: 1500 [2020-07-20 17:12:40,468 INFO L226 Difference]: Without dead ends: 874 [2020-07-20 17:12:40,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 17:12:40,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 874 states. [2020-07-20 17:12:40,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 874 to 872. [2020-07-20 17:12:40,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 872 states. [2020-07-20 17:12:40,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 872 states to 872 states and 1302 transitions. [2020-07-20 17:12:40,506 INFO L78 Accepts]: Start accepts. Automaton has 872 states and 1302 transitions. Word has length 23 [2020-07-20 17:12:40,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:40,506 INFO L479 AbstractCegarLoop]: Abstraction has 872 states and 1302 transitions. [2020-07-20 17:12:40,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:40,507 INFO L276 IsEmpty]: Start isEmpty. Operand 872 states and 1302 transitions. [2020-07-20 17:12:40,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:40,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:40,509 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:40,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,723 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:40,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:40,724 INFO L82 PathProgramCache]: Analyzing trace with hash 728586230, now seen corresponding path program 1 times [2020-07-20 17:12:40,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:40,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500350754] [2020-07-20 17:12:40,725 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,764 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:40,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:40,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:40,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:40,776 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 17:12:40,779 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:40,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500350754] [2020-07-20 17:12:40,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:40,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:40,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905566979] [2020-07-20 17:12:40,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:40,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:40,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:40,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:40,784 INFO L87 Difference]: Start difference. First operand 872 states and 1302 transitions. Second operand 3 states. [2020-07-20 17:12:40,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:40,825 INFO L93 Difference]: Finished difference Result 1308 states and 1944 transitions. [2020-07-20 17:12:40,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:40,826 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:40,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:40,832 INFO L225 Difference]: With dead ends: 1308 [2020-07-20 17:12:40,833 INFO L226 Difference]: Without dead ends: 890 [2020-07-20 17:12:40,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:12:40,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2020-07-20 17:12:40,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 888. [2020-07-20 17:12:40,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 888 states. [2020-07-20 17:12:40,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1302 transitions. [2020-07-20 17:12:40,873 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1302 transitions. Word has length 24 [2020-07-20 17:12:40,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:40,874 INFO L479 AbstractCegarLoop]: Abstraction has 888 states and 1302 transitions. [2020-07-20 17:12:40,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:40,874 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1302 transitions. [2020-07-20 17:12:40,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:40,877 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:40,877 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:41,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:41,090 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:41,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:41,091 INFO L82 PathProgramCache]: Analyzing trace with hash 141780216, now seen corresponding path program 1 times [2020-07-20 17:12:41,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:41,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974316520] [2020-07-20 17:12:41,093 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:41,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:41,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:41,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:41,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:41,145 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 17:12:41,145 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:41,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974316520] [2020-07-20 17:12:41,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:41,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:41,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027260810] [2020-07-20 17:12:41,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:41,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:41,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:41,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:41,155 INFO L87 Difference]: Start difference. First operand 888 states and 1302 transitions. Second operand 3 states. [2020-07-20 17:12:41,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:41,203 INFO L93 Difference]: Finished difference Result 1548 states and 2312 transitions. [2020-07-20 17:12:41,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:41,204 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:41,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:41,215 INFO L225 Difference]: With dead ends: 1548 [2020-07-20 17:12:41,216 INFO L226 Difference]: Without dead ends: 1546 [2020-07-20 17:12:41,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:12:41,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-20 17:12:41,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1288. [2020-07-20 17:12:41,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1288 states. [2020-07-20 17:12:41,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1288 states to 1288 states and 1830 transitions. [2020-07-20 17:12:41,275 INFO L78 Accepts]: Start accepts. Automaton has 1288 states and 1830 transitions. Word has length 24 [2020-07-20 17:12:41,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:41,277 INFO L479 AbstractCegarLoop]: Abstraction has 1288 states and 1830 transitions. [2020-07-20 17:12:41,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:41,277 INFO L276 IsEmpty]: Start isEmpty. Operand 1288 states and 1830 transitions. [2020-07-20 17:12:41,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:41,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:41,281 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:41,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:41,497 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:41,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:41,497 INFO L82 PathProgramCache]: Analyzing trace with hash 399945654, now seen corresponding path program 1 times [2020-07-20 17:12:41,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:41,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533680645] [2020-07-20 17:12:41,498 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:41,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:41,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:41,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:41,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:41,557 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 17:12:41,557 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:41,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533680645] [2020-07-20 17:12:41,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:41,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:41,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726523112] [2020-07-20 17:12:41,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:41,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:41,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:41,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:41,560 INFO L87 Difference]: Start difference. First operand 1288 states and 1830 transitions. Second operand 3 states. [2020-07-20 17:12:41,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:41,608 INFO L93 Difference]: Finished difference Result 2956 states and 4200 transitions. [2020-07-20 17:12:41,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:41,608 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:41,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:41,619 INFO L225 Difference]: With dead ends: 2956 [2020-07-20 17:12:41,619 INFO L226 Difference]: Without dead ends: 1706 [2020-07-20 17:12:41,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:12:41,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1706 states. [2020-07-20 17:12:41,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1706 to 1704. [2020-07-20 17:12:41,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1704 states. [2020-07-20 17:12:41,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1704 states to 1704 states and 2374 transitions. [2020-07-20 17:12:41,719 INFO L78 Accepts]: Start accepts. Automaton has 1704 states and 2374 transitions. Word has length 24 [2020-07-20 17:12:41,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:41,720 INFO L479 AbstractCegarLoop]: Abstraction has 1704 states and 2374 transitions. [2020-07-20 17:12:41,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:41,720 INFO L276 IsEmpty]: Start isEmpty. Operand 1704 states and 2374 transitions. [2020-07-20 17:12:41,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:41,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:41,724 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:41,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:41,939 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:41,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:41,940 INFO L82 PathProgramCache]: Analyzing trace with hash 100434809, now seen corresponding path program 1 times [2020-07-20 17:12:41,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:41,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968045963] [2020-07-20 17:12:41,942 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:41,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:41,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:41,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:41,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:41,992 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 17:12:41,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:41,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968045963] [2020-07-20 17:12:41,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:41,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:41,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217599734] [2020-07-20 17:12:41,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:41,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:41,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:41,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:41,997 INFO L87 Difference]: Start difference. First operand 1704 states and 2374 transitions. Second operand 3 states. [2020-07-20 17:12:42,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:42,044 INFO L93 Difference]: Finished difference Result 2556 states and 3544 transitions. [2020-07-20 17:12:42,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:42,045 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:42,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:42,054 INFO L225 Difference]: With dead ends: 2556 [2020-07-20 17:12:42,055 INFO L226 Difference]: Without dead ends: 1738 [2020-07-20 17:12:42,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 17:12:42,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1738 states. [2020-07-20 17:12:42,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1738 to 1736. [2020-07-20 17:12:42,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1736 states. [2020-07-20 17:12:42,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2374 transitions. [2020-07-20 17:12:42,120 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2374 transitions. Word has length 25 [2020-07-20 17:12:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:42,121 INFO L479 AbstractCegarLoop]: Abstraction has 1736 states and 2374 transitions. [2020-07-20 17:12:42,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:42,121 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2374 transitions. [2020-07-20 17:12:42,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:42,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:42,124 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:42,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:42,339 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:42,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:42,339 INFO L82 PathProgramCache]: Analyzing trace with hash -486371205, now seen corresponding path program 1 times [2020-07-20 17:12:42,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:42,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393616458] [2020-07-20 17:12:42,340 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:42,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:42,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:42,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:42,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:42,410 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 17:12:42,411 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:42,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393616458] [2020-07-20 17:12:42,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:42,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:42,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146698218] [2020-07-20 17:12:42,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:42,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:42,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:42,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:42,416 INFO L87 Difference]: Start difference. First operand 1736 states and 2374 transitions. Second operand 3 states. [2020-07-20 17:12:42,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:42,477 INFO L93 Difference]: Finished difference Result 2956 states and 4104 transitions. [2020-07-20 17:12:42,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:42,478 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:42,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:42,497 INFO L225 Difference]: With dead ends: 2956 [2020-07-20 17:12:42,497 INFO L226 Difference]: Without dead ends: 2954 [2020-07-20 17:12:42,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 17:12:42,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-07-20 17:12:42,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2568. [2020-07-20 17:12:42,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2568 states. [2020-07-20 17:12:42,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2568 states to 2568 states and 3398 transitions. [2020-07-20 17:12:42,596 INFO L78 Accepts]: Start accepts. Automaton has 2568 states and 3398 transitions. Word has length 25 [2020-07-20 17:12:42,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:42,596 INFO L479 AbstractCegarLoop]: Abstraction has 2568 states and 3398 transitions. [2020-07-20 17:12:42,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:42,597 INFO L276 IsEmpty]: Start isEmpty. Operand 2568 states and 3398 transitions. [2020-07-20 17:12:42,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:42,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:42,602 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:42,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:42,817 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:42,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:42,817 INFO L82 PathProgramCache]: Analyzing trace with hash -228205767, now seen corresponding path program 1 times [2020-07-20 17:12:42,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:42,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664307932] [2020-07-20 17:12:42,818 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:42,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:42,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:42,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:42,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:42,872 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 17:12:42,873 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:42,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664307932] [2020-07-20 17:12:42,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:42,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:42,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040497761] [2020-07-20 17:12:42,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:42,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:42,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:42,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:42,875 INFO L87 Difference]: Start difference. First operand 2568 states and 3398 transitions. Second operand 3 states. [2020-07-20 17:12:42,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:42,991 INFO L93 Difference]: Finished difference Result 5836 states and 7688 transitions. [2020-07-20 17:12:42,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:42,992 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:42,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:43,011 INFO L225 Difference]: With dead ends: 5836 [2020-07-20 17:12:43,011 INFO L226 Difference]: Without dead ends: 3338 [2020-07-20 17:12:43,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 17:12:43,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3338 states. [2020-07-20 17:12:43,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3338 to 3336. [2020-07-20 17:12:43,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3336 states. [2020-07-20 17:12:43,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3336 states to 3336 states and 4294 transitions. [2020-07-20 17:12:43,118 INFO L78 Accepts]: Start accepts. Automaton has 3336 states and 4294 transitions. Word has length 25 [2020-07-20 17:12:43,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:43,118 INFO L479 AbstractCegarLoop]: Abstraction has 3336 states and 4294 transitions. [2020-07-20 17:12:43,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:43,119 INFO L276 IsEmpty]: Start isEmpty. Operand 3336 states and 4294 transitions. [2020-07-20 17:12:43,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:43,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:43,124 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:43,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:43,339 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:43,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:43,340 INFO L82 PathProgramCache]: Analyzing trace with hash 2102577579, now seen corresponding path program 1 times [2020-07-20 17:12:43,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:43,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10400254] [2020-07-20 17:12:43,341 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:43,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:43,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:43,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:43,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:43,387 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 17:12:43,388 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:43,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10400254] [2020-07-20 17:12:43,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:43,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:43,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613097095] [2020-07-20 17:12:43,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:43,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:43,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:43,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:43,390 INFO L87 Difference]: Start difference. First operand 3336 states and 4294 transitions. Second operand 3 states. [2020-07-20 17:12:43,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:43,450 INFO L93 Difference]: Finished difference Result 5004 states and 6408 transitions. [2020-07-20 17:12:43,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:43,450 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:43,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:43,468 INFO L225 Difference]: With dead ends: 5004 [2020-07-20 17:12:43,469 INFO L226 Difference]: Without dead ends: 3402 [2020-07-20 17:12:43,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 17:12:43,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3402 states. [2020-07-20 17:12:43,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3402 to 3400. [2020-07-20 17:12:43,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3400 states. [2020-07-20 17:12:43,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3400 states to 3400 states and 4294 transitions. [2020-07-20 17:12:43,583 INFO L78 Accepts]: Start accepts. Automaton has 3400 states and 4294 transitions. Word has length 26 [2020-07-20 17:12:43,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:43,584 INFO L479 AbstractCegarLoop]: Abstraction has 3400 states and 4294 transitions. [2020-07-20 17:12:43,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:43,584 INFO L276 IsEmpty]: Start isEmpty. Operand 3400 states and 4294 transitions. [2020-07-20 17:12:43,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:43,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:43,590 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:43,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:43,804 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:43,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:43,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1515771565, now seen corresponding path program 1 times [2020-07-20 17:12:43,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:43,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690494650] [2020-07-20 17:12:43,806 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:43,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:43,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:43,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:43,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:43,850 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 17:12:43,851 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:43,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690494650] [2020-07-20 17:12:43,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:43,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:43,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155185481] [2020-07-20 17:12:43,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:43,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:43,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:43,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:43,852 INFO L87 Difference]: Start difference. First operand 3400 states and 4294 transitions. Second operand 3 states. [2020-07-20 17:12:43,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:43,964 INFO L93 Difference]: Finished difference Result 9804 states and 12104 transitions. [2020-07-20 17:12:43,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:43,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:43,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:44,010 INFO L225 Difference]: With dead ends: 9804 [2020-07-20 17:12:44,011 INFO L226 Difference]: Without dead ends: 6538 [2020-07-20 17:12:44,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 17:12:44,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6538 states. [2020-07-20 17:12:44,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6538 to 6536. [2020-07-20 17:12:44,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6536 states. [2020-07-20 17:12:44,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6536 states to 6536 states and 7814 transitions. [2020-07-20 17:12:44,289 INFO L78 Accepts]: Start accepts. Automaton has 6536 states and 7814 transitions. Word has length 26 [2020-07-20 17:12:44,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:44,290 INFO L479 AbstractCegarLoop]: Abstraction has 6536 states and 7814 transitions. [2020-07-20 17:12:44,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:44,290 INFO L276 IsEmpty]: Start isEmpty. Operand 6536 states and 7814 transitions. [2020-07-20 17:12:44,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:44,301 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:44,302 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:44,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:44,517 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:44,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:44,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1257606127, now seen corresponding path program 1 times [2020-07-20 17:12:44,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:44,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811151027] [2020-07-20 17:12:44,520 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:44,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:44,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:44,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:44,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:44,584 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 17:12:44,584 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:44,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811151027] [2020-07-20 17:12:44,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:44,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:44,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732612889] [2020-07-20 17:12:44,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:44,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:44,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:44,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:44,587 INFO L87 Difference]: Start difference. First operand 6536 states and 7814 transitions. Second operand 3 states. [2020-07-20 17:12:44,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:44,703 INFO L93 Difference]: Finished difference Result 7052 states and 8584 transitions. [2020-07-20 17:12:44,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:44,704 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:44,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:44,729 INFO L225 Difference]: With dead ends: 7052 [2020-07-20 17:12:44,729 INFO L226 Difference]: Without dead ends: 7050 [2020-07-20 17:12:44,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 17:12:44,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7050 states. [2020-07-20 17:12:44,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7050 to 6536. [2020-07-20 17:12:44,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6536 states. [2020-07-20 17:12:44,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6536 states to 6536 states and 7686 transitions. [2020-07-20 17:12:44,986 INFO L78 Accepts]: Start accepts. Automaton has 6536 states and 7686 transitions. Word has length 26 [2020-07-20 17:12:44,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:44,986 INFO L479 AbstractCegarLoop]: Abstraction has 6536 states and 7686 transitions. [2020-07-20 17:12:44,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:44,987 INFO L276 IsEmpty]: Start isEmpty. Operand 6536 states and 7686 transitions. [2020-07-20 17:12:44,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:44,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:44,997 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:45,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:45,211 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:45,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:45,211 INFO L82 PathProgramCache]: Analyzing trace with hash -255505650, now seen corresponding path program 1 times [2020-07-20 17:12:45,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:45,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818725962] [2020-07-20 17:12:45,212 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:45,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:45,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:45,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:45,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:45,265 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 17:12:45,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:45,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818725962] [2020-07-20 17:12:45,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:45,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:45,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150757124] [2020-07-20 17:12:45,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:45,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:45,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:45,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:45,267 INFO L87 Difference]: Start difference. First operand 6536 states and 7686 transitions. Second operand 3 states. [2020-07-20 17:12:45,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:45,397 INFO L93 Difference]: Finished difference Result 10634 states and 12423 transitions. [2020-07-20 17:12:45,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:45,398 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:45,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:45,425 INFO L225 Difference]: With dead ends: 10634 [2020-07-20 17:12:45,425 INFO L226 Difference]: Without dead ends: 10632 [2020-07-20 17:12:45,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 17:12:45,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10632 states. [2020-07-20 17:12:45,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10632 to 10120. [2020-07-20 17:12:45,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10120 states. [2020-07-20 17:12:45,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10120 states to 10120 states and 11654 transitions. [2020-07-20 17:12:45,659 INFO L78 Accepts]: Start accepts. Automaton has 10120 states and 11654 transitions. Word has length 27 [2020-07-20 17:12:45,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:45,660 INFO L479 AbstractCegarLoop]: Abstraction has 10120 states and 11654 transitions. [2020-07-20 17:12:45,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:45,660 INFO L276 IsEmpty]: Start isEmpty. Operand 10120 states and 11654 transitions. [2020-07-20 17:12:45,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:45,684 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:45,684 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:45,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:45,898 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:45,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:45,899 INFO L82 PathProgramCache]: Analyzing trace with hash 2659788, now seen corresponding path program 1 times [2020-07-20 17:12:45,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:45,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721455162] [2020-07-20 17:12:45,900 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:45,951 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:45,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:45,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:45,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:45,962 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 17:12:45,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:45,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721455162] [2020-07-20 17:12:45,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:45,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:45,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875380764] [2020-07-20 17:12:45,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:45,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:45,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:45,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:45,966 INFO L87 Difference]: Start difference. First operand 10120 states and 11654 transitions. Second operand 3 states. [2020-07-20 17:12:46,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:46,298 INFO L93 Difference]: Finished difference Result 22664 states and 25734 transitions. [2020-07-20 17:12:46,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:46,299 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:46,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:46,299 INFO L225 Difference]: With dead ends: 22664 [2020-07-20 17:12:46,299 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 17:12:46,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 17:12:46,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 17:12:46,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 17:12:46,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 17:12:46,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 17:12:46,347 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-20 17:12:46,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:46,348 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 17:12:46,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:46,348 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 17:12:46,348 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 17:12:46,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:46,565 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 17:12:46,645 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 17:12:46,646 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:46,646 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:46,646 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 17:12:46,646 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 17:12:46,646 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 17:12:46,646 INFO L268 CegarLoopResult]: For program point L93-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,647 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 149) no Hoare annotation was computed. [2020-07-20 17:12:46,647 INFO L268 CegarLoopResult]: For program point L85-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,647 INFO L268 CegarLoopResult]: For program point L110(line 110) no Hoare annotation was computed. [2020-07-20 17:12:46,647 INFO L268 CegarLoopResult]: For program point L77-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,647 INFO L268 CegarLoopResult]: For program point L135(line 135) no Hoare annotation was computed. [2020-07-20 17:12:46,647 INFO L268 CegarLoopResult]: For program point L69-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,647 INFO L268 CegarLoopResult]: For program point L61(lines 61 63) no Hoare annotation was computed. [2020-07-20 17:12:46,648 INFO L268 CegarLoopResult]: For program point L61-2(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,649 INFO L268 CegarLoopResult]: For program point L119-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,649 INFO L268 CegarLoopResult]: For program point L120(line 120) no Hoare annotation was computed. [2020-07-20 17:12:46,650 INFO L271 CegarLoopResult]: At program point L145(lines 5 149) the Hoare annotation is: true [2020-07-20 17:12:46,650 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 149) no Hoare annotation was computed. [2020-07-20 17:12:46,650 INFO L268 CegarLoopResult]: For program point L104-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,650 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 17:12:46,650 INFO L268 CegarLoopResult]: For program point L129-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,650 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 147) no Hoare annotation was computed. [2020-07-20 17:12:46,650 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 149) the Hoare annotation is: true [2020-07-20 17:12:46,651 INFO L268 CegarLoopResult]: For program point L105(line 105) no Hoare annotation was computed. [2020-07-20 17:12:46,651 INFO L268 CegarLoopResult]: For program point L130(line 130) no Hoare annotation was computed. [2020-07-20 17:12:46,651 INFO L268 CegarLoopResult]: For program point L89-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,651 INFO L268 CegarLoopResult]: For program point L114-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,651 INFO L268 CegarLoopResult]: For program point L81-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,651 INFO L271 CegarLoopResult]: At program point L139-1(lines 36 144) the Hoare annotation is: true [2020-07-20 17:12:46,652 INFO L268 CegarLoopResult]: For program point L73-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,652 INFO L268 CegarLoopResult]: For program point L65-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,652 INFO L268 CegarLoopResult]: For program point L115(line 115) no Hoare annotation was computed. [2020-07-20 17:12:46,652 INFO L268 CegarLoopResult]: For program point L140(line 140) no Hoare annotation was computed. [2020-07-20 17:12:46,652 INFO L264 CegarLoopResult]: At program point L140-1(lines 5 149) the Hoare annotation is: false [2020-07-20 17:12:46,652 INFO L268 CegarLoopResult]: For program point L99-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,653 INFO L268 CegarLoopResult]: For program point L124-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,653 INFO L268 CegarLoopResult]: For program point L100(line 100) no Hoare annotation was computed. [2020-07-20 17:12:46,653 INFO L268 CegarLoopResult]: For program point L125(line 125) no Hoare annotation was computed. [2020-07-20 17:12:46,653 INFO L268 CegarLoopResult]: For program point L109-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,653 INFO L268 CegarLoopResult]: For program point L134-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 17:12:46,671 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:12:46 BoogieIcfgContainer [2020-07-20 17:12:46,671 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:12:46,680 INFO L168 Benchmark]: Toolchain (without parser) took 12407.44 ms. Allocated memory was 144.2 MB in the beginning and 330.3 MB in the end (delta: 186.1 MB). Free memory was 102.0 MB in the beginning and 190.3 MB in the end (delta: -88.3 MB). Peak memory consumption was 97.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:46,681 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 17:12:46,681 INFO L168 Benchmark]: CACSL2BoogieTranslator took 582.75 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 101.6 MB in the beginning and 181.0 MB in the end (delta: -79.4 MB). Peak memory consumption was 19.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:46,682 INFO L168 Benchmark]: Boogie Preprocessor took 47.69 ms. Allocated memory is still 201.9 MB. Free memory was 181.0 MB in the beginning and 179.1 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:46,682 INFO L168 Benchmark]: RCFGBuilder took 429.67 ms. Allocated memory is still 201.9 MB. Free memory was 178.5 MB in the beginning and 160.3 MB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:46,683 INFO L168 Benchmark]: TraceAbstraction took 11338.05 ms. Allocated memory was 201.9 MB in the beginning and 330.3 MB in the end (delta: 128.5 MB). Free memory was 159.6 MB in the beginning and 190.3 MB in the end (delta: -30.7 MB). Peak memory consumption was 97.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:46,691 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 582.75 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 101.6 MB in the beginning and 181.0 MB in the end (delta: -79.4 MB). Peak memory consumption was 19.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 47.69 ms. Allocated memory is still 201.9 MB. Free memory was 181.0 MB in the beginning and 179.1 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 429.67 ms. Allocated memory is still 201.9 MB. Free memory was 178.5 MB in the beginning and 160.3 MB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 11338.05 ms. Allocated memory was 201.9 MB in the beginning and 330.3 MB in the end (delta: 128.5 MB). Free memory was 159.6 MB in the beginning and 190.3 MB in the end (delta: -30.7 MB). Peak memory consumption was 97.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 147]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 11.1s, OverallIterations: 25, TraceHistogramMax: 1, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1937 SDtfs, 926 SDslu, 1314 SDs, 0 SdLazy, 133 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 550 GetRequests, 525 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=10120occurred in iteration=24, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.6s AutomataMinimizationTime, 25 MinimizatonAttempts, 2072 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 522 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 575 NumberOfCodeBlocks, 572 NumberOfCodeBlocksAsserted, 99 NumberOfCheckSat, 550 ConstructedInterpolants, 0 QuantifiedInterpolants, 23930 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2549 ConjunctsInSsa, 75 ConjunctsInUnsatCore, 25 InterpolantComputations, 25 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...