/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:35:22,073 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:35:22,075 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:35:22,088 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 22:35:22,097 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:35:22,098 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:35:22,099 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:35:22,100 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:35:22,101 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:35:22,102 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:35:22,104 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:35:22,106 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:35:22,107 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:35:22,109 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:35:22,110 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:35:22,110 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:35:22,113 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:35:22,120 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:35:22,121 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:35:22,122 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:35:22,123 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:35:22,137 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:35:22,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:35:22,138 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:35:22,139 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:35:22,139 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:35:22,139 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:35:22,139 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:35:22,139 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:35:22,140 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:35:22,140 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:35:22,140 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:35:22,140 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:35:22,140 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:35:22,141 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:35:22,141 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:35:22,141 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:35:22,141 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:35:22,141 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:35:22,142 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:35:22,142 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:35:22,142 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:35:22,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:35:22,142 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:35:22,143 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:35:22,143 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:35:22,143 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:35:22,143 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:22,143 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:35:22,144 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:35:22,144 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:35:22,534 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:35:22,550 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:35:22,553 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:35:22,554 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:35:22,555 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:35:22,555 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 22:35:22,629 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba30c02ae/26034bcb6ee54beb9900645627ed310c/FLAGfb0c950c1 [2020-07-21 22:35:23,072 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:35:23,073 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 22:35:23,081 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba30c02ae/26034bcb6ee54beb9900645627ed310c/FLAGfb0c950c1 [2020-07-21 22:35:23,445 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba30c02ae/26034bcb6ee54beb9900645627ed310c [2020-07-21 22:35:23,454 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:35:23,458 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:35:23,458 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:35:23,459 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:35:23,462 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:35:23,463 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,466 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a68ac04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23, skipping insertion in model container [2020-07-21 22:35:23,466 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,474 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:35:23,496 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:35:23,718 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:35:23,724 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:35:23,779 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:35:23,800 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:35:23,801 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23 WrapperNode [2020-07-21 22:35:23,801 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:35:23,802 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:35:23,802 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:35:23,802 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:35:23,896 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,897 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,904 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,905 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,922 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,937 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,945 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... [2020-07-21 22:35:23,951 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:35:23,955 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:35:23,955 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:35:23,955 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:35:23,956 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:35:24,033 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:35:24,033 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:35:24,033 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:35:24,033 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:35:24,035 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:35:24,035 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:35:24,036 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:35:24,036 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:35:24,398 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:35:24,398 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 22:35:24,402 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:35:24 BoogieIcfgContainer [2020-07-21 22:35:24,402 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:35:24,404 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:35:24,404 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:35:24,407 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:35:24,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:35:23" (1/3) ... [2020-07-21 22:35:24,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4120a611 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:35:24, skipping insertion in model container [2020-07-21 22:35:24,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:23" (2/3) ... [2020-07-21 22:35:24,409 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4120a611 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:35:24, skipping insertion in model container [2020-07-21 22:35:24,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:35:24" (3/3) ... [2020-07-21 22:35:24,411 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-21 22:35:24,424 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:35:24,432 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:35:24,448 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:35:24,475 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:35:24,476 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:35:24,476 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:35:24,476 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:35:24,476 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:35:24,477 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:35:24,477 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:35:24,477 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:35:24,497 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-21 22:35:24,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 22:35:24,504 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:24,505 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] [2020-07-21 22:35:24,505 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:24,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:24,512 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-21 22:35:24,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:24,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085005974] [2020-07-21 22:35:24,521 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:24,645 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:24,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:24,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:24,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:24,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:24,694 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:24,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085005974] [2020-07-21 22:35:24,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:24,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:24,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046867810] [2020-07-21 22:35:24,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:24,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:24,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:24,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:24,720 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-21 22:35:24,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:24,779 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-21 22:35:24,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:24,781 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 22:35:24,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:24,794 INFO L225 Difference]: With dead ends: 93 [2020-07-21 22:35:24,794 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 22:35:24,798 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 [2020-07-21 22:35:24,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 22:35:24,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-21 22:35:24,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 22:35:24,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-21 22:35:24,841 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-21 22:35:24,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:24,842 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-21 22:35:24,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:24,842 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-21 22:35:24,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 22:35:24,843 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:24,844 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] [2020-07-21 22:35:25,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:25,051 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:25,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:25,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-21 22:35:25,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:25,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118503783] [2020-07-21 22:35:25,054 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:25,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:25,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:25,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:25,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:25,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:25,145 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:25,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118503783] [2020-07-21 22:35:25,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:25,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:25,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077737979] [2020-07-21 22:35:25,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:25,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:25,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:25,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:25,155 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-21 22:35:25,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:25,205 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-21 22:35:25,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:25,209 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 22:35:25,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:25,211 INFO L225 Difference]: With dead ends: 127 [2020-07-21 22:35:25,211 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 22:35:25,214 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 [2020-07-21 22:35:25,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 22:35:25,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-21 22:35:25,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:35:25,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-21 22:35:25,241 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-21 22:35:25,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:25,241 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-21 22:35:25,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:25,241 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-21 22:35:25,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:35:25,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:25,244 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] [2020-07-21 22:35:25,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:25,446 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:25,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:25,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-21 22:35:25,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:25,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197830451] [2020-07-21 22:35:25,449 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:25,510 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:25,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:25,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:25,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:25,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:25,528 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:25,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197830451] [2020-07-21 22:35:25,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:25,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:25,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588838717] [2020-07-21 22:35:25,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:25,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:25,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:25,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:25,531 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-21 22:35:25,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:25,560 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 22:35:25,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:25,561 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 22:35:25,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:25,563 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:35:25,563 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 22:35:25,564 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 [2020-07-21 22:35:25,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 22:35:25,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-07-21 22:35:25,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 22:35:25,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 139 transitions. [2020-07-21 22:35:25,574 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 139 transitions. Word has length 22 [2020-07-21 22:35:25,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:25,575 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 139 transitions. [2020-07-21 22:35:25,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:25,575 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 139 transitions. [2020-07-21 22:35:25,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:35:25,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:25,577 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] [2020-07-21 22:35:25,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:25,790 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:25,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:25,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1794675624, now seen corresponding path program 1 times [2020-07-21 22:35:25,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:25,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462817909] [2020-07-21 22:35:25,793 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:25,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:25,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:25,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:25,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:25,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:25,873 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:25,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462817909] [2020-07-21 22:35:25,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:25,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:25,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785460779] [2020-07-21 22:35:25,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:25,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:25,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:25,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:25,875 INFO L87 Difference]: Start difference. First operand 79 states and 139 transitions. Second operand 3 states. [2020-07-21 22:35:25,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:25,898 INFO L93 Difference]: Finished difference Result 148 states and 264 transitions. [2020-07-21 22:35:25,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:25,898 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 22:35:25,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:25,900 INFO L225 Difference]: With dead ends: 148 [2020-07-21 22:35:25,901 INFO L226 Difference]: Without dead ends: 146 [2020-07-21 22:35:25,901 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 [2020-07-21 22:35:25,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-21 22:35:25,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 104. [2020-07-21 22:35:25,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 22:35:25,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-21 22:35:25,912 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-21 22:35:25,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:25,913 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-21 22:35:25,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:25,913 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-21 22:35:25,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:35:25,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:25,914 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] [2020-07-21 22:35:26,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:26,129 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:26,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:26,129 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-21 22:35:26,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:26,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869791600] [2020-07-21 22:35:26,131 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:26,183 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:26,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:26,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:26,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:26,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:26,202 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:26,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869791600] [2020-07-21 22:35:26,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:26,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:26,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571315955] [2020-07-21 22:35:26,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:26,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:26,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:26,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:26,205 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-21 22:35:26,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:26,234 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-21 22:35:26,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:26,235 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 22:35:26,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:26,236 INFO L225 Difference]: With dead ends: 244 [2020-07-21 22:35:26,236 INFO L226 Difference]: Without dead ends: 148 [2020-07-21 22:35:26,238 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 [2020-07-21 22:35:26,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-21 22:35:26,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-21 22:35:26,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-21 22:35:26,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-21 22:35:26,251 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-21 22:35:26,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:26,251 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-21 22:35:26,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:26,251 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-21 22:35:26,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 22:35:26,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:26,253 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] [2020-07-21 22:35:26,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:26,463 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:26,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:26,464 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-21 22:35:26,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:26,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981040032] [2020-07-21 22:35:26,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:26,511 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:26,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:26,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:26,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:26,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:26,522 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:26,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981040032] [2020-07-21 22:35:26,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:26,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:26,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141610128] [2020-07-21 22:35:26,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:26,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:26,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:26,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:26,524 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-21 22:35:26,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:26,548 INFO L93 Difference]: Finished difference Result 219 states and 385 transitions. [2020-07-21 22:35:26,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:26,548 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 22:35:26,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:26,550 INFO L225 Difference]: With dead ends: 219 [2020-07-21 22:35:26,550 INFO L226 Difference]: Without dead ends: 150 [2020-07-21 22:35:26,551 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 [2020-07-21 22:35:26,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-21 22:35:26,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2020-07-21 22:35:26,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 22:35:26,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 258 transitions. [2020-07-21 22:35:26,573 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 258 transitions. Word has length 23 [2020-07-21 22:35:26,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:26,574 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 258 transitions. [2020-07-21 22:35:26,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:26,574 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 258 transitions. [2020-07-21 22:35:26,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 22:35:26,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:26,577 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] [2020-07-21 22:35:26,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:26,779 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:26,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:26,780 INFO L82 PathProgramCache]: Analyzing trace with hash -1479280785, now seen corresponding path program 1 times [2020-07-21 22:35:26,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:26,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [300562542] [2020-07-21 22:35:26,782 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 [2020-07-21 22:35:26,820 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:26,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:26,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:26,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:26,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:26,836 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:26,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [300562542] [2020-07-21 22:35:26,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:26,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:26,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984036753] [2020-07-21 22:35:26,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:26,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:26,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:26,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:26,838 INFO L87 Difference]: Start difference. First operand 148 states and 258 transitions. Second operand 3 states. [2020-07-21 22:35:26,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:26,858 INFO L93 Difference]: Finished difference Result 276 states and 488 transitions. [2020-07-21 22:35:26,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:26,859 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 22:35:26,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:26,861 INFO L225 Difference]: With dead ends: 276 [2020-07-21 22:35:26,861 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 22:35:26,862 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 [2020-07-21 22:35:26,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 22:35:26,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 200. [2020-07-21 22:35:26,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 22:35:26,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-21 22:35:26,873 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-21 22:35:26,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:26,873 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-21 22:35:26,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:26,873 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-21 22:35:26,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 22:35:26,880 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:26,880 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] [2020-07-21 22:35:27,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:27,096 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:27,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:27,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-21 22:35:27,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:27,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1834713972] [2020-07-21 22:35:27,098 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 [2020-07-21 22:35:27,135 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:27,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:27,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:27,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:27,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:27,150 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:27,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1834713972] [2020-07-21 22:35:27,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:27,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:27,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378103767] [2020-07-21 22:35:27,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:27,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:27,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:27,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:27,152 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-21 22:35:27,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:27,175 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-21 22:35:27,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:27,176 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 22:35:27,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:27,178 INFO L225 Difference]: With dead ends: 472 [2020-07-21 22:35:27,179 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 22:35:27,180 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 [2020-07-21 22:35:27,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 22:35:27,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-21 22:35:27,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-21 22:35:27,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-21 22:35:27,193 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-21 22:35:27,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:27,193 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-21 22:35:27,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:27,194 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-21 22:35:27,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 22:35:27,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:27,195 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] [2020-07-21 22:35:27,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:27,409 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:27,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:27,410 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-21 22:35:27,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:27,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359216900] [2020-07-21 22:35:27,412 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 [2020-07-21 22:35:27,454 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:27,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:27,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:27,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:27,471 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:27,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359216900] [2020-07-21 22:35:27,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:27,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:27,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366584364] [2020-07-21 22:35:27,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:27,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:27,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:27,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:27,474 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-21 22:35:27,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:27,492 INFO L93 Difference]: Finished difference Result 420 states and 720 transitions. [2020-07-21 22:35:27,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:27,493 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 22:35:27,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:27,495 INFO L225 Difference]: With dead ends: 420 [2020-07-21 22:35:27,495 INFO L226 Difference]: Without dead ends: 286 [2020-07-21 22:35:27,496 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 [2020-07-21 22:35:27,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-21 22:35:27,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 284. [2020-07-21 22:35:27,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 22:35:27,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 482 transitions. [2020-07-21 22:35:27,509 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 482 transitions. Word has length 24 [2020-07-21 22:35:27,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:27,509 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 482 transitions. [2020-07-21 22:35:27,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:27,509 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 482 transitions. [2020-07-21 22:35:27,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 22:35:27,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:27,511 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] [2020-07-21 22:35:27,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:27,725 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:27,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:27,726 INFO L82 PathProgramCache]: Analyzing trace with hash 107285981, now seen corresponding path program 1 times [2020-07-21 22:35:27,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:27,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1059623116] [2020-07-21 22:35:27,727 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 [2020-07-21 22:35:27,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:27,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:27,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:27,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:27,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:27,783 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:27,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1059623116] [2020-07-21 22:35:27,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:27,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:27,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952169238] [2020-07-21 22:35:27,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:27,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:27,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:27,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:27,786 INFO L87 Difference]: Start difference. First operand 284 states and 482 transitions. Second operand 3 states. [2020-07-21 22:35:27,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:27,812 INFO L93 Difference]: Finished difference Result 524 states and 904 transitions. [2020-07-21 22:35:27,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:27,813 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 22:35:27,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:27,816 INFO L225 Difference]: With dead ends: 524 [2020-07-21 22:35:27,816 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 22:35:27,817 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 [2020-07-21 22:35:27,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 22:35:27,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 392. [2020-07-21 22:35:27,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-21 22:35:27,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 654 transitions. [2020-07-21 22:35:27,841 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 654 transitions. Word has length 24 [2020-07-21 22:35:27,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:27,841 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 654 transitions. [2020-07-21 22:35:27,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:27,841 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 654 transitions. [2020-07-21 22:35:27,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 22:35:27,843 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:27,843 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] [2020-07-21 22:35:28,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:28,058 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:28,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:28,059 INFO L82 PathProgramCache]: Analyzing trace with hash -903831269, now seen corresponding path program 1 times [2020-07-21 22:35:28,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:28,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237656153] [2020-07-21 22:35:28,060 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 [2020-07-21 22:35:28,094 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:28,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:28,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:28,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:28,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:28,107 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:28,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237656153] [2020-07-21 22:35:28,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:28,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:28,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398846904] [2020-07-21 22:35:28,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:28,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:28,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:28,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:28,109 INFO L87 Difference]: Start difference. First operand 392 states and 654 transitions. Second operand 3 states. [2020-07-21 22:35:28,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:28,142 INFO L93 Difference]: Finished difference Result 924 states and 1552 transitions. [2020-07-21 22:35:28,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:28,142 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 22:35:28,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:28,146 INFO L225 Difference]: With dead ends: 924 [2020-07-21 22:35:28,146 INFO L226 Difference]: Without dead ends: 546 [2020-07-21 22:35:28,147 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 [2020-07-21 22:35:28,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2020-07-21 22:35:28,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 544. [2020-07-21 22:35:28,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-21 22:35:28,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 902 transitions. [2020-07-21 22:35:28,166 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 902 transitions. Word has length 24 [2020-07-21 22:35:28,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:28,166 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 902 transitions. [2020-07-21 22:35:28,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:28,166 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 902 transitions. [2020-07-21 22:35:28,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 22:35:28,170 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:28,170 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] [2020-07-21 22:35:28,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:28,386 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:28,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:28,387 INFO L82 PathProgramCache]: Analyzing trace with hash -968887806, now seen corresponding path program 1 times [2020-07-21 22:35:28,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:28,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745950386] [2020-07-21 22:35:28,388 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 [2020-07-21 22:35:28,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:28,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:28,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:28,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:28,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:28,435 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:28,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745950386] [2020-07-21 22:35:28,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:28,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:28,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301087280] [2020-07-21 22:35:28,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:28,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:28,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:28,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:28,437 INFO L87 Difference]: Start difference. First operand 544 states and 902 transitions. Second operand 3 states. [2020-07-21 22:35:28,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:28,457 INFO L93 Difference]: Finished difference Result 816 states and 1348 transitions. [2020-07-21 22:35:28,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:28,458 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 22:35:28,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:28,461 INFO L225 Difference]: With dead ends: 816 [2020-07-21 22:35:28,461 INFO L226 Difference]: Without dead ends: 554 [2020-07-21 22:35:28,462 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 [2020-07-21 22:35:28,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2020-07-21 22:35:28,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 552. [2020-07-21 22:35:28,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 552 states. [2020-07-21 22:35:28,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 902 transitions. [2020-07-21 22:35:28,478 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 902 transitions. Word has length 25 [2020-07-21 22:35:28,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:28,478 INFO L479 AbstractCegarLoop]: Abstraction has 552 states and 902 transitions. [2020-07-21 22:35:28,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:28,478 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 902 transitions. [2020-07-21 22:35:28,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 22:35:28,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:28,480 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] [2020-07-21 22:35:28,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:28,693 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:28,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:28,694 INFO L82 PathProgramCache]: Analyzing trace with hash 2046215812, now seen corresponding path program 1 times [2020-07-21 22:35:28,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:28,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385003454] [2020-07-21 22:35:28,694 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 [2020-07-21 22:35:28,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:28,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:28,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:28,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:28,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:28,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:28,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [385003454] [2020-07-21 22:35:28,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:28,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:28,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841702835] [2020-07-21 22:35:28,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:28,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:28,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:28,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:28,762 INFO L87 Difference]: Start difference. First operand 552 states and 902 transitions. Second operand 3 states. [2020-07-21 22:35:28,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:28,791 INFO L93 Difference]: Finished difference Result 1004 states and 1672 transitions. [2020-07-21 22:35:28,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:28,792 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 22:35:28,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:28,799 INFO L225 Difference]: With dead ends: 1004 [2020-07-21 22:35:28,799 INFO L226 Difference]: Without dead ends: 1002 [2020-07-21 22:35:28,800 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 [2020-07-21 22:35:28,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2020-07-21 22:35:28,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 776. [2020-07-21 22:35:28,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 22:35:28,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1238 transitions. [2020-07-21 22:35:28,829 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1238 transitions. Word has length 25 [2020-07-21 22:35:28,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:28,830 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1238 transitions. [2020-07-21 22:35:28,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:28,830 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1238 transitions. [2020-07-21 22:35:28,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 22:35:28,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:28,833 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] [2020-07-21 22:35:29,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:29,048 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:29,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:29,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1035098562, now seen corresponding path program 1 times [2020-07-21 22:35:29,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:29,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216011564] [2020-07-21 22:35:29,049 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 [2020-07-21 22:35:29,092 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:29,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:29,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:29,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:29,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:29,100 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:29,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216011564] [2020-07-21 22:35:29,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:29,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:29,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933638730] [2020-07-21 22:35:29,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:29,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:29,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:29,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:29,102 INFO L87 Difference]: Start difference. First operand 776 states and 1238 transitions. Second operand 3 states. [2020-07-21 22:35:29,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:29,133 INFO L93 Difference]: Finished difference Result 1820 states and 2920 transitions. [2020-07-21 22:35:29,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:29,133 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 22:35:29,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:29,139 INFO L225 Difference]: With dead ends: 1820 [2020-07-21 22:35:29,139 INFO L226 Difference]: Without dead ends: 1066 [2020-07-21 22:35:29,142 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 [2020-07-21 22:35:29,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2020-07-21 22:35:29,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1064. [2020-07-21 22:35:29,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1064 states. [2020-07-21 22:35:29,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1686 transitions. [2020-07-21 22:35:29,177 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1686 transitions. Word has length 25 [2020-07-21 22:35:29,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:29,177 INFO L479 AbstractCegarLoop]: Abstraction has 1064 states and 1686 transitions. [2020-07-21 22:35:29,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:29,177 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1686 transitions. [2020-07-21 22:35:29,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:35:29,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:29,179 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] [2020-07-21 22:35:29,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:29,393 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:29,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:29,393 INFO L82 PathProgramCache]: Analyzing trace with hash -991604848, now seen corresponding path program 1 times [2020-07-21 22:35:29,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:29,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944671398] [2020-07-21 22:35:29,394 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 [2020-07-21 22:35:29,431 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:29,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:29,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:29,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:29,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:29,444 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:29,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1944671398] [2020-07-21 22:35:29,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:29,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:29,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731157856] [2020-07-21 22:35:29,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:29,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:29,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:29,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:29,446 INFO L87 Difference]: Start difference. First operand 1064 states and 1686 transitions. Second operand 3 states. [2020-07-21 22:35:29,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:29,472 INFO L93 Difference]: Finished difference Result 1596 states and 2520 transitions. [2020-07-21 22:35:29,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:29,473 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 22:35:29,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:29,490 INFO L225 Difference]: With dead ends: 1596 [2020-07-21 22:35:29,491 INFO L226 Difference]: Without dead ends: 1082 [2020-07-21 22:35:29,494 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 [2020-07-21 22:35:29,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1082 states. [2020-07-21 22:35:29,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1082 to 1080. [2020-07-21 22:35:29,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1080 states. [2020-07-21 22:35:29,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1080 states to 1080 states and 1686 transitions. [2020-07-21 22:35:29,525 INFO L78 Accepts]: Start accepts. Automaton has 1080 states and 1686 transitions. Word has length 26 [2020-07-21 22:35:29,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:29,527 INFO L479 AbstractCegarLoop]: Abstraction has 1080 states and 1686 transitions. [2020-07-21 22:35:29,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:29,528 INFO L276 IsEmpty]: Start isEmpty. Operand 1080 states and 1686 transitions. [2020-07-21 22:35:29,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:35:29,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:29,530 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] [2020-07-21 22:35:29,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:29,744 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:29,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:29,744 INFO L82 PathProgramCache]: Analyzing trace with hash 2023498770, now seen corresponding path program 1 times [2020-07-21 22:35:29,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:29,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952476764] [2020-07-21 22:35:29,745 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 [2020-07-21 22:35:29,783 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:29,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:29,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:29,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:29,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:29,797 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:29,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952476764] [2020-07-21 22:35:29,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:29,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:29,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96887756] [2020-07-21 22:35:29,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:29,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:29,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:29,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:29,799 INFO L87 Difference]: Start difference. First operand 1080 states and 1686 transitions. Second operand 3 states. [2020-07-21 22:35:29,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:29,835 INFO L93 Difference]: Finished difference Result 1932 states and 3080 transitions. [2020-07-21 22:35:29,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:29,836 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 22:35:29,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:29,846 INFO L225 Difference]: With dead ends: 1932 [2020-07-21 22:35:29,846 INFO L226 Difference]: Without dead ends: 1930 [2020-07-21 22:35:29,847 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 [2020-07-21 22:35:29,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2020-07-21 22:35:29,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1544. [2020-07-21 22:35:29,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 22:35:29,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2342 transitions. [2020-07-21 22:35:29,898 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2342 transitions. Word has length 26 [2020-07-21 22:35:29,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:29,898 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2342 transitions. [2020-07-21 22:35:29,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:29,898 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2342 transitions. [2020-07-21 22:35:29,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:35:29,901 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:29,901 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] [2020-07-21 22:35:30,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:30,117 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:30,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:30,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1012381520, now seen corresponding path program 1 times [2020-07-21 22:35:30,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:30,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325015080] [2020-07-21 22:35:30,118 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 [2020-07-21 22:35:30,152 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:30,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:30,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:30,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:30,163 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:30,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:30,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325015080] [2020-07-21 22:35:30,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:30,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:30,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066837722] [2020-07-21 22:35:30,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:30,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:30,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:30,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:30,170 INFO L87 Difference]: Start difference. First operand 1544 states and 2342 transitions. Second operand 3 states. [2020-07-21 22:35:30,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:30,214 INFO L93 Difference]: Finished difference Result 3596 states and 5480 transitions. [2020-07-21 22:35:30,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:30,215 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 22:35:30,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:30,225 INFO L225 Difference]: With dead ends: 3596 [2020-07-21 22:35:30,225 INFO L226 Difference]: Without dead ends: 2090 [2020-07-21 22:35:30,228 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 [2020-07-21 22:35:30,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2020-07-21 22:35:30,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 2088. [2020-07-21 22:35:30,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2088 states. [2020-07-21 22:35:30,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 3142 transitions. [2020-07-21 22:35:30,283 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 3142 transitions. Word has length 26 [2020-07-21 22:35:30,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:30,284 INFO L479 AbstractCegarLoop]: Abstraction has 2088 states and 3142 transitions. [2020-07-21 22:35:30,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:30,284 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 3142 transitions. [2020-07-21 22:35:30,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:35:30,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:30,287 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] [2020-07-21 22:35:30,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:30,501 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:30,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:30,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1695832809, now seen corresponding path program 1 times [2020-07-21 22:35:30,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:30,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833933220] [2020-07-21 22:35:30,502 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 [2020-07-21 22:35:30,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:30,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:30,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:30,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:30,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:30,549 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:30,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833933220] [2020-07-21 22:35:30,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:30,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:30,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233271694] [2020-07-21 22:35:30,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:30,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:30,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:30,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:30,552 INFO L87 Difference]: Start difference. First operand 2088 states and 3142 transitions. Second operand 3 states. [2020-07-21 22:35:30,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:30,585 INFO L93 Difference]: Finished difference Result 3132 states and 4696 transitions. [2020-07-21 22:35:30,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:30,586 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 22:35:30,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:30,594 INFO L225 Difference]: With dead ends: 3132 [2020-07-21 22:35:30,594 INFO L226 Difference]: Without dead ends: 2122 [2020-07-21 22:35:30,597 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 [2020-07-21 22:35:30,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2122 states. [2020-07-21 22:35:30,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2122 to 2120. [2020-07-21 22:35:30,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2120 states. [2020-07-21 22:35:30,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2120 states to 2120 states and 3142 transitions. [2020-07-21 22:35:30,665 INFO L78 Accepts]: Start accepts. Automaton has 2120 states and 3142 transitions. Word has length 27 [2020-07-21 22:35:30,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:30,666 INFO L479 AbstractCegarLoop]: Abstraction has 2120 states and 3142 transitions. [2020-07-21 22:35:30,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:30,666 INFO L276 IsEmpty]: Start isEmpty. Operand 2120 states and 3142 transitions. [2020-07-21 22:35:30,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:35:30,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:30,670 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, 1, 1, 1, 1, 1] [2020-07-21 22:35:30,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:30,884 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:30,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:30,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1319270809, now seen corresponding path program 1 times [2020-07-21 22:35:30,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:30,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366440517] [2020-07-21 22:35:30,885 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 [2020-07-21 22:35:30,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:30,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:30,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:30,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:30,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:30,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:30,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366440517] [2020-07-21 22:35:30,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:30,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:30,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413909424] [2020-07-21 22:35:30,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:30,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:30,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:30,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:30,931 INFO L87 Difference]: Start difference. First operand 2120 states and 3142 transitions. Second operand 3 states. [2020-07-21 22:35:30,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:30,995 INFO L93 Difference]: Finished difference Result 3724 states and 5640 transitions. [2020-07-21 22:35:30,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:30,995 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 22:35:30,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:31,010 INFO L225 Difference]: With dead ends: 3724 [2020-07-21 22:35:31,011 INFO L226 Difference]: Without dead ends: 3722 [2020-07-21 22:35:31,014 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 [2020-07-21 22:35:31,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-21 22:35:31,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3080. [2020-07-21 22:35:31,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3080 states. [2020-07-21 22:35:31,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3080 states to 3080 states and 4422 transitions. [2020-07-21 22:35:31,101 INFO L78 Accepts]: Start accepts. Automaton has 3080 states and 4422 transitions. Word has length 27 [2020-07-21 22:35:31,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:31,101 INFO L479 AbstractCegarLoop]: Abstraction has 3080 states and 4422 transitions. [2020-07-21 22:35:31,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:31,101 INFO L276 IsEmpty]: Start isEmpty. Operand 3080 states and 4422 transitions. [2020-07-21 22:35:31,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:35:31,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:31,106 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] [2020-07-21 22:35:31,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:31,320 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:31,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:31,321 INFO L82 PathProgramCache]: Analyzing trace with hash 308153559, now seen corresponding path program 1 times [2020-07-21 22:35:31,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:31,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [702240396] [2020-07-21 22:35:31,321 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 [2020-07-21 22:35:31,373 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:31,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:31,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:31,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:31,382 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:31,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:31,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [702240396] [2020-07-21 22:35:31,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:31,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:31,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499209762] [2020-07-21 22:35:31,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:31,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:31,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:31,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:31,385 INFO L87 Difference]: Start difference. First operand 3080 states and 4422 transitions. Second operand 3 states. [2020-07-21 22:35:31,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:31,441 INFO L93 Difference]: Finished difference Result 7116 states and 10248 transitions. [2020-07-21 22:35:31,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:31,442 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 22:35:31,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:31,458 INFO L225 Difference]: With dead ends: 7116 [2020-07-21 22:35:31,458 INFO L226 Difference]: Without dead ends: 4106 [2020-07-21 22:35:31,464 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 [2020-07-21 22:35:31,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4106 states. [2020-07-21 22:35:31,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4106 to 4104. [2020-07-21 22:35:31,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4104 states. [2020-07-21 22:35:31,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4104 states to 4104 states and 5830 transitions. [2020-07-21 22:35:31,597 INFO L78 Accepts]: Start accepts. Automaton has 4104 states and 5830 transitions. Word has length 27 [2020-07-21 22:35:31,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:31,598 INFO L479 AbstractCegarLoop]: Abstraction has 4104 states and 5830 transitions. [2020-07-21 22:35:31,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:31,598 INFO L276 IsEmpty]: Start isEmpty. Operand 4104 states and 5830 transitions. [2020-07-21 22:35:31,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 22:35:31,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:31,603 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, 1] [2020-07-21 22:35:31,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:31,808 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:31,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:31,809 INFO L82 PathProgramCache]: Analyzing trace with hash -2052062779, now seen corresponding path program 1 times [2020-07-21 22:35:31,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:31,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020653037] [2020-07-21 22:35:31,810 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 [2020-07-21 22:35:31,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:31,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:31,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:31,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:31,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:31,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:31,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020653037] [2020-07-21 22:35:31,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:31,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:31,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848075703] [2020-07-21 22:35:31,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:31,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:31,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:31,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:31,857 INFO L87 Difference]: Start difference. First operand 4104 states and 5830 transitions. Second operand 3 states. [2020-07-21 22:35:31,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:31,909 INFO L93 Difference]: Finished difference Result 6156 states and 8712 transitions. [2020-07-21 22:35:31,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:31,909 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 22:35:31,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:31,926 INFO L225 Difference]: With dead ends: 6156 [2020-07-21 22:35:31,926 INFO L226 Difference]: Without dead ends: 4170 [2020-07-21 22:35:31,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:31,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4170 states. [2020-07-21 22:35:32,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4170 to 4168. [2020-07-21 22:35:32,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4168 states. [2020-07-21 22:35:32,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4168 states to 4168 states and 5830 transitions. [2020-07-21 22:35:32,021 INFO L78 Accepts]: Start accepts. Automaton has 4168 states and 5830 transitions. Word has length 28 [2020-07-21 22:35:32,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:32,021 INFO L479 AbstractCegarLoop]: Abstraction has 4168 states and 5830 transitions. [2020-07-21 22:35:32,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:32,021 INFO L276 IsEmpty]: Start isEmpty. Operand 4168 states and 5830 transitions. [2020-07-21 22:35:32,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 22:35:32,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:32,026 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, 1] [2020-07-21 22:35:32,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:32,240 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:32,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:32,240 INFO L82 PathProgramCache]: Analyzing trace with hash 963040839, now seen corresponding path program 1 times [2020-07-21 22:35:32,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:32,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674498981] [2020-07-21 22:35:32,241 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 [2020-07-21 22:35:32,272 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:32,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:32,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:32,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:32,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:32,289 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:32,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674498981] [2020-07-21 22:35:32,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:32,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:32,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720276883] [2020-07-21 22:35:32,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:32,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:32,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:32,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:32,291 INFO L87 Difference]: Start difference. First operand 4168 states and 5830 transitions. Second operand 3 states. [2020-07-21 22:35:32,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:32,378 INFO L93 Difference]: Finished difference Result 12108 states and 16712 transitions. [2020-07-21 22:35:32,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:32,379 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 22:35:32,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:32,435 INFO L225 Difference]: With dead ends: 12108 [2020-07-21 22:35:32,435 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 22:35:32,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:32,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 22:35:32,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 8072. [2020-07-21 22:35:32,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 22:35:32,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10886 transitions. [2020-07-21 22:35:32,614 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10886 transitions. Word has length 28 [2020-07-21 22:35:32,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:32,614 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10886 transitions. [2020-07-21 22:35:32,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:32,614 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10886 transitions. [2020-07-21 22:35:32,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 22:35:32,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:32,624 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, 1] [2020-07-21 22:35:32,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:32,838 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:32,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:32,839 INFO L82 PathProgramCache]: Analyzing trace with hash 1974158089, now seen corresponding path program 1 times [2020-07-21 22:35:32,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:32,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900019980] [2020-07-21 22:35:32,840 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 [2020-07-21 22:35:32,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:32,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:32,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:32,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:32,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:32,885 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:32,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900019980] [2020-07-21 22:35:32,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:32,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:32,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606415676] [2020-07-21 22:35:32,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:32,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:32,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:32,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:32,888 INFO L87 Difference]: Start difference. First operand 8072 states and 10886 transitions. Second operand 3 states. [2020-07-21 22:35:33,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:33,011 INFO L93 Difference]: Finished difference Result 9100 states and 12680 transitions. [2020-07-21 22:35:33,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:33,012 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 22:35:33,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:33,031 INFO L225 Difference]: With dead ends: 9100 [2020-07-21 22:35:33,031 INFO L226 Difference]: Without dead ends: 9098 [2020-07-21 22:35:33,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:33,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9098 states. [2020-07-21 22:35:33,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9098 to 8072. [2020-07-21 22:35:33,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 22:35:33,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10758 transitions. [2020-07-21 22:35:33,276 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10758 transitions. Word has length 28 [2020-07-21 22:35:33,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:33,276 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10758 transitions. [2020-07-21 22:35:33,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:33,277 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10758 transitions. [2020-07-21 22:35:33,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 22:35:33,286 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:33,286 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, 1, 1] [2020-07-21 22:35:33,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:33,500 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:33,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:33,500 INFO L82 PathProgramCache]: Analyzing trace with hash -210289620, now seen corresponding path program 1 times [2020-07-21 22:35:33,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:33,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941072962] [2020-07-21 22:35:33,501 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 [2020-07-21 22:35:33,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:33,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:33,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:33,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:33,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:33,543 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:33,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941072962] [2020-07-21 22:35:33,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:33,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:33,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118984990] [2020-07-21 22:35:33,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:33,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:33,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:33,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:33,544 INFO L87 Difference]: Start difference. First operand 8072 states and 10758 transitions. Second operand 3 states. [2020-07-21 22:35:33,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:33,689 INFO L93 Difference]: Finished difference Result 13708 states and 18568 transitions. [2020-07-21 22:35:33,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:33,689 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 22:35:33,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:33,714 INFO L225 Difference]: With dead ends: 13708 [2020-07-21 22:35:33,715 INFO L226 Difference]: Without dead ends: 13706 [2020-07-21 22:35:33,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:33,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13706 states. [2020-07-21 22:35:34,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13706 to 12168. [2020-07-21 22:35:34,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12168 states. [2020-07-21 22:35:34,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12168 states to 12168 states and 15750 transitions. [2020-07-21 22:35:34,030 INFO L78 Accepts]: Start accepts. Automaton has 12168 states and 15750 transitions. Word has length 29 [2020-07-21 22:35:34,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:34,030 INFO L479 AbstractCegarLoop]: Abstraction has 12168 states and 15750 transitions. [2020-07-21 22:35:34,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:34,030 INFO L276 IsEmpty]: Start isEmpty. Operand 12168 states and 15750 transitions. [2020-07-21 22:35:34,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 22:35:34,047 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:34,047 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, 1, 1] [2020-07-21 22:35:34,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:34,262 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:34,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:34,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1221406870, now seen corresponding path program 1 times [2020-07-21 22:35:34,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:34,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091464475] [2020-07-21 22:35:34,263 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 [2020-07-21 22:35:34,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:34,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:34,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:34,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:34,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:34,307 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:34,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091464475] [2020-07-21 22:35:34,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:34,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:34,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490075701] [2020-07-21 22:35:34,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:34,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:34,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:34,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:34,309 INFO L87 Difference]: Start difference. First operand 12168 states and 15750 transitions. Second operand 3 states. [2020-07-21 22:35:34,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:34,474 INFO L93 Difference]: Finished difference Result 27788 states and 35976 transitions. [2020-07-21 22:35:34,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:34,475 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 22:35:34,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:34,505 INFO L225 Difference]: With dead ends: 27788 [2020-07-21 22:35:34,505 INFO L226 Difference]: Without dead ends: 15754 [2020-07-21 22:35:34,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:34,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15754 states. [2020-07-21 22:35:34,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15754 to 15752. [2020-07-21 22:35:34,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15752 states. [2020-07-21 22:35:34,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15752 states to 15752 states and 19974 transitions. [2020-07-21 22:35:34,917 INFO L78 Accepts]: Start accepts. Automaton has 15752 states and 19974 transitions. Word has length 29 [2020-07-21 22:35:34,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:34,917 INFO L479 AbstractCegarLoop]: Abstraction has 15752 states and 19974 transitions. [2020-07-21 22:35:34,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:34,917 INFO L276 IsEmpty]: Start isEmpty. Operand 15752 states and 19974 transitions. [2020-07-21 22:35:34,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 22:35:34,935 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:34,935 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, 1, 1, 1] [2020-07-21 22:35:35,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:35,151 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:35,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:35,152 INFO L82 PathProgramCache]: Analyzing trace with hash 2071172156, now seen corresponding path program 1 times [2020-07-21 22:35:35,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:35,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397369002] [2020-07-21 22:35:35,153 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:35,186 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:35,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:35,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:35,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:35,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:35,199 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:35,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397369002] [2020-07-21 22:35:35,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:35,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:35,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132364675] [2020-07-21 22:35:35,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:35,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:35,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:35,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:35,200 INFO L87 Difference]: Start difference. First operand 15752 states and 19974 transitions. Second operand 3 states. [2020-07-21 22:35:35,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:35,463 INFO L93 Difference]: Finished difference Result 23820 states and 30216 transitions. [2020-07-21 22:35:35,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:35,463 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 22:35:35,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:35,493 INFO L225 Difference]: With dead ends: 23820 [2020-07-21 22:35:35,493 INFO L226 Difference]: Without dead ends: 16138 [2020-07-21 22:35:35,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:35,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16138 states. [2020-07-21 22:35:35,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16138 to 16136. [2020-07-21 22:35:35,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16136 states. [2020-07-21 22:35:35,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16136 states to 16136 states and 20230 transitions. [2020-07-21 22:35:35,759 INFO L78 Accepts]: Start accepts. Automaton has 16136 states and 20230 transitions. Word has length 30 [2020-07-21 22:35:35,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:35,759 INFO L479 AbstractCegarLoop]: Abstraction has 16136 states and 20230 transitions. [2020-07-21 22:35:35,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:35,759 INFO L276 IsEmpty]: Start isEmpty. Operand 16136 states and 20230 transitions. [2020-07-21 22:35:35,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 22:35:35,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:35,768 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, 1, 1, 1] [2020-07-21 22:35:35,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:35,976 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:35,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:35,977 INFO L82 PathProgramCache]: Analyzing trace with hash 791308478, now seen corresponding path program 1 times [2020-07-21 22:35:35,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:35,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [310485456] [2020-07-21 22:35:35,978 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:36,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:36,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:36,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:36,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:36,012 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:36,013 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:36,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [310485456] [2020-07-21 22:35:36,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:36,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:36,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113659457] [2020-07-21 22:35:36,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:36,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:36,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:36,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:36,014 INFO L87 Difference]: Start difference. First operand 16136 states and 20230 transitions. Second operand 3 states. [2020-07-21 22:35:36,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:36,700 INFO L93 Difference]: Finished difference Result 26636 states and 33544 transitions. [2020-07-21 22:35:36,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:36,701 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 22:35:36,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:36,750 INFO L225 Difference]: With dead ends: 26636 [2020-07-21 22:35:36,750 INFO L226 Difference]: Without dead ends: 26634 [2020-07-21 22:35:36,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:36,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26634 states. [2020-07-21 22:35:37,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26634 to 24584. [2020-07-21 22:35:37,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24584 states. [2020-07-21 22:35:37,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24584 states to 24584 states and 29958 transitions. [2020-07-21 22:35:37,241 INFO L78 Accepts]: Start accepts. Automaton has 24584 states and 29958 transitions. Word has length 30 [2020-07-21 22:35:37,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:37,242 INFO L479 AbstractCegarLoop]: Abstraction has 24584 states and 29958 transitions. [2020-07-21 22:35:37,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:37,242 INFO L276 IsEmpty]: Start isEmpty. Operand 24584 states and 29958 transitions. [2020-07-21 22:35:37,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 22:35:37,270 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:37,270 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, 1, 1, 1] [2020-07-21 22:35:37,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:37,485 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:37,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:37,486 INFO L82 PathProgramCache]: Analyzing trace with hash -219808772, now seen corresponding path program 1 times [2020-07-21 22:35:37,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:37,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196592139] [2020-07-21 22:35:37,487 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:37,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:37,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:37,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:37,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:37,535 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:37,535 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:37,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1196592139] [2020-07-21 22:35:37,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:37,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:37,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554369553] [2020-07-21 22:35:37,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:37,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:37,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:37,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:37,537 INFO L87 Difference]: Start difference. First operand 24584 states and 29958 transitions. Second operand 3 states. [2020-07-21 22:35:37,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:37,813 INFO L93 Difference]: Finished difference Result 55308 states and 66824 transitions. [2020-07-21 22:35:37,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:37,814 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 22:35:37,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:37,857 INFO L225 Difference]: With dead ends: 55308 [2020-07-21 22:35:37,857 INFO L226 Difference]: Without dead ends: 31242 [2020-07-21 22:35:37,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:37,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31242 states. [2020-07-21 22:35:38,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31242 to 31240. [2020-07-21 22:35:38,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31240 states. [2020-07-21 22:35:38,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31240 states to 31240 states and 36870 transitions. [2020-07-21 22:35:38,472 INFO L78 Accepts]: Start accepts. Automaton has 31240 states and 36870 transitions. Word has length 30 [2020-07-21 22:35:38,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:38,472 INFO L479 AbstractCegarLoop]: Abstraction has 31240 states and 36870 transitions. [2020-07-21 22:35:38,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:38,473 INFO L276 IsEmpty]: Start isEmpty. Operand 31240 states and 36870 transitions. [2020-07-21 22:35:38,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:35:38,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:38,486 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, 1, 1, 1, 1] [2020-07-21 22:35:38,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:38,688 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:38,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:38,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1239024833, now seen corresponding path program 1 times [2020-07-21 22:35:38,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:38,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545685022] [2020-07-21 22:35:38,689 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:38,718 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:38,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:38,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:38,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:38,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:38,725 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:38,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545685022] [2020-07-21 22:35:38,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:38,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:38,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23285744] [2020-07-21 22:35:38,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:38,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:38,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:38,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:38,727 INFO L87 Difference]: Start difference. First operand 31240 states and 36870 transitions. Second operand 3 states. [2020-07-21 22:35:38,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:38,967 INFO L93 Difference]: Finished difference Result 46860 states and 55048 transitions. [2020-07-21 22:35:38,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:38,967 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 22:35:38,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:39,004 INFO L225 Difference]: With dead ends: 46860 [2020-07-21 22:35:39,004 INFO L226 Difference]: Without dead ends: 31754 [2020-07-21 22:35:39,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:39,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31754 states. [2020-07-21 22:35:39,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31754 to 31752. [2020-07-21 22:35:39,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31752 states. [2020-07-21 22:35:39,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31752 states to 31752 states and 36870 transitions. [2020-07-21 22:35:39,583 INFO L78 Accepts]: Start accepts. Automaton has 31752 states and 36870 transitions. Word has length 31 [2020-07-21 22:35:39,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:39,583 INFO L479 AbstractCegarLoop]: Abstraction has 31752 states and 36870 transitions. [2020-07-21 22:35:39,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:39,583 INFO L276 IsEmpty]: Start isEmpty. Operand 31752 states and 36870 transitions. [2020-07-21 22:35:39,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:35:39,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:39,595 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, 1, 1, 1, 1] [2020-07-21 22:35:39,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:39,796 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:39,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:39,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1776078785, now seen corresponding path program 1 times [2020-07-21 22:35:39,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:39,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650413354] [2020-07-21 22:35:39,798 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:39,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:39,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:39,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:39,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:39,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:39,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:39,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650413354] [2020-07-21 22:35:39,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:39,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:39,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352177259] [2020-07-21 22:35:39,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:39,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:39,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:39,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:39,842 INFO L87 Difference]: Start difference. First operand 31752 states and 36870 transitions. Second operand 3 states. [2020-07-21 22:35:40,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:40,299 INFO L93 Difference]: Finished difference Result 51210 states and 58887 transitions. [2020-07-21 22:35:40,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:40,300 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 22:35:40,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:40,341 INFO L225 Difference]: With dead ends: 51210 [2020-07-21 22:35:40,342 INFO L226 Difference]: Without dead ends: 51208 [2020-07-21 22:35:40,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:40,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51208 states. [2020-07-21 22:35:41,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51208 to 49160. [2020-07-21 22:35:41,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49160 states. [2020-07-21 22:35:41,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49160 states to 49160 states and 55814 transitions. [2020-07-21 22:35:41,128 INFO L78 Accepts]: Start accepts. Automaton has 49160 states and 55814 transitions. Word has length 31 [2020-07-21 22:35:41,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:41,128 INFO L479 AbstractCegarLoop]: Abstraction has 49160 states and 55814 transitions. [2020-07-21 22:35:41,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:41,128 INFO L276 IsEmpty]: Start isEmpty. Operand 49160 states and 55814 transitions. [2020-07-21 22:35:41,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:35:41,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:41,159 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, 1, 1, 1, 1] [2020-07-21 22:35:41,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:41,360 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:41,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:41,361 INFO L82 PathProgramCache]: Analyzing trace with hash 764961535, now seen corresponding path program 1 times [2020-07-21 22:35:41,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:41,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946334669] [2020-07-21 22:35:41,361 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:41,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:41,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:41,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:41,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:41,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:35:41,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:41,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946334669] [2020-07-21 22:35:41,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:41,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:41,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450086804] [2020-07-21 22:35:41,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:41,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:41,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:41,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:41,406 INFO L87 Difference]: Start difference. First operand 49160 states and 55814 transitions. Second operand 3 states. [2020-07-21 22:35:41,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:41,828 INFO L93 Difference]: Finished difference Result 109576 states and 122374 transitions. [2020-07-21 22:35:41,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:41,828 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 22:35:41,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:41,829 INFO L225 Difference]: With dead ends: 109576 [2020-07-21 22:35:41,829 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:35:41,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:41,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:35:41,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:35:41,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:35:41,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:35:41,910 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-21 22:35:41,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:41,910 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:35:41,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:41,910 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:35:41,910 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:35:42,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:42,127 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:35:42,180 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:35:42,181 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:35:42,181 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:35:42,181 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:35:42,181 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:35:42,181 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:35:42,181 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-21 22:35:42,181 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-21 22:35:42,181 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-21 22:35:42,182 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,183 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-21 22:35:42,184 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-21 22:35:42,184 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-21 22:35:42,184 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-21 22:35:42,184 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,184 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,186 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-21 22:35:42,186 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-21 22:35:42,186 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-21 22:35:42,186 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,186 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-21 22:35:42,187 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,188 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 22:35:42,188 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-21 22:35:42,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:35:42 BoogieIcfgContainer [2020-07-21 22:35:42,201 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:35:42,203 INFO L168 Benchmark]: Toolchain (without parser) took 18746.88 ms. Allocated memory was 142.1 MB in the beginning and 881.3 MB in the end (delta: 739.2 MB). Free memory was 106.6 MB in the beginning and 176.1 MB in the end (delta: -69.5 MB). Peak memory consumption was 669.7 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:42,204 INFO L168 Benchmark]: CDTParser took 0.52 ms. Allocated memory is still 142.1 MB. Free memory was 125.1 MB in the beginning and 124.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 22:35:42,204 INFO L168 Benchmark]: CACSL2BoogieTranslator took 342.88 ms. Allocated memory is still 142.1 MB. Free memory was 106.1 MB in the beginning and 95.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:42,204 INFO L168 Benchmark]: Boogie Preprocessor took 152.60 ms. Allocated memory was 142.1 MB in the beginning and 202.4 MB in the end (delta: 60.3 MB). Free memory was 95.2 MB in the beginning and 180.1 MB in the end (delta: -84.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:42,205 INFO L168 Benchmark]: RCFGBuilder took 447.85 ms. Allocated memory is still 202.4 MB. Free memory was 180.1 MB in the beginning and 160.1 MB in the end (delta: 20.0 MB). Peak memory consumption was 20.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:42,205 INFO L168 Benchmark]: TraceAbstraction took 17797.35 ms. Allocated memory was 202.4 MB in the beginning and 881.3 MB in the end (delta: 679.0 MB). Free memory was 159.5 MB in the beginning and 176.1 MB in the end (delta: -16.6 MB). Peak memory consumption was 662.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:42,207 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.52 ms. Allocated memory is still 142.1 MB. Free memory was 125.1 MB in the beginning and 124.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 342.88 ms. Allocated memory is still 142.1 MB. Free memory was 106.1 MB in the beginning and 95.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 152.60 ms. Allocated memory was 142.1 MB in the beginning and 202.4 MB in the end (delta: 60.3 MB). Free memory was 95.2 MB in the beginning and 180.1 MB in the end (delta: -84.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 447.85 ms. Allocated memory is still 202.4 MB. Free memory was 180.1 MB in the beginning and 160.1 MB in the end (delta: 20.0 MB). Peak memory consumption was 20.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 17797.35 ms. Allocated memory was 202.4 MB in the beginning and 881.3 MB in the end (delta: 679.0 MB). Free memory was 159.5 MB in the beginning and 176.1 MB in the end (delta: -16.6 MB). Peak memory consumption was 662.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 175]: 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: 42]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 47 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 17.6s, OverallIterations: 31, TraceHistogramMax: 1, AutomataDifference: 4.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2877 SDtfs, 1405 SDslu, 1967 SDs, 0 SdLazy, 165 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 777 GetRequests, 746 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49160occurred in iteration=30, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 4.2s AutomataMinimizationTime, 31 MinimizatonAttempts, 8224 StatesRemovedByMinimization, 30 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 2058 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 808 NumberOfCodeBlocks, 808 NumberOfCodeBlocksAsserted, 124 NumberOfCheckSat, 777 ConstructedInterpolants, 0 QuantifiedInterpolants, 39912 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3761 ConjunctsInSsa, 93 ConjunctsInUnsatCore, 31 InterpolantComputations, 31 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...