/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:35:13,596 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:35:13,600 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:35:13,623 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:35:13,624 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:35:13,626 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:35:13,628 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:35:13,638 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:35:13,645 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:35:13,650 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:35:13,655 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:35:13,656 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:35:13,656 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:35:13,659 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:35:13,661 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:35:13,663 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:35:13,665 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:35:13,667 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:35:13,669 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:35:13,672 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:35:13,675 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:35:13,678 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:35:13,679 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:35:13,680 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:35:13,684 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:35:13,698 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:35:13,699 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:35:13,699 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:35:13,700 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 13:35:13,723 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:35:13,724 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:35:13,725 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:35:13,725 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:35:13,726 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:35:13,726 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:35:13,726 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:35:13,726 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:35:13,727 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:35:13,727 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:35:13,727 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:35:13,727 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:35:13,727 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:35:13,728 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:35:13,728 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:35:13,728 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:35:13,728 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:35:13,728 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:35:13,729 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:35:13,729 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:35:13,729 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:35:13,729 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:35:13,730 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:35:13,730 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:35:13,730 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:35:13,730 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:35:13,731 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:13,731 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:35:13,731 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:35:13,731 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:35:14,175 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:35:14,218 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:35:14,225 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:35:14,228 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:35:14,229 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:35:14,230 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 13:35:14,380 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19b085f3c/5fc4c11b1e1b4759a373e025a6a64190/FLAG3257be229 [2020-07-21 13:35:15,225 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:35:15,227 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 13:35:15,242 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19b085f3c/5fc4c11b1e1b4759a373e025a6a64190/FLAG3257be229 [2020-07-21 13:35:15,273 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19b085f3c/5fc4c11b1e1b4759a373e025a6a64190 [2020-07-21 13:35:15,292 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:35:15,297 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:35:15,300 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:15,300 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:35:15,306 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:35:15,307 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,313 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13775586 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15, skipping insertion in model container [2020-07-21 13:35:15,313 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,325 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:35:15,361 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:35:15,649 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:15,658 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:35:15,697 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:15,717 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:35:15,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15 WrapperNode [2020-07-21 13:35:15,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:15,721 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:35:15,721 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:35:15,721 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:35:15,738 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,739 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,748 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,749 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,882 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,906 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,908 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (1/1) ... [2020-07-21 13:35:15,913 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:35:15,914 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:35:15,914 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:35:15,915 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:35:15,917 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (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 13:35:16,022 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:35:16,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:35:16,023 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:35:16,023 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:35:16,024 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:35:16,024 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:35:16,025 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:35:16,025 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:35:16,620 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:35:16,621 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 13:35:16,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:16 BoogieIcfgContainer [2020-07-21 13:35:16,629 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:35:16,631 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:35:16,632 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:35:16,638 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:35:16,639 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:35:15" (1/3) ... [2020-07-21 13:35:16,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3570035a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:16, skipping insertion in model container [2020-07-21 13:35:16,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:15" (2/3) ... [2020-07-21 13:35:16,643 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3570035a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:16, skipping insertion in model container [2020-07-21 13:35:16,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:16" (3/3) ... [2020-07-21 13:35:16,646 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-21 13:35:16,666 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:35:16,684 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:35:16,705 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:35:16,749 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:35:16,750 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:35:16,750 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:35:16,750 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:35:16,750 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:35:16,751 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:35:16,751 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:35:16,751 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:35:16,785 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-21 13:35:16,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:16,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:16,801 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 13:35:16,802 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:16,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:16,813 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-21 13:35:16,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:16,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288151961] [2020-07-21 13:35:16,825 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:17,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:17,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:17,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:17,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:17,091 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 13:35:17,092 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:17,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288151961] [2020-07-21 13:35:17,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:17,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:17,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286138921] [2020-07-21 13:35:17,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:17,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:17,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:17,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:17,137 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-21 13:35:17,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:17,237 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-21 13:35:17,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:17,241 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:17,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:17,265 INFO L225 Difference]: With dead ends: 93 [2020-07-21 13:35:17,266 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:35:17,273 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 13:35:17,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:35:17,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-21 13:35:17,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 13:35:17,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-21 13:35:17,358 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-21 13:35:17,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:17,360 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-21 13:35:17,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:17,360 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-21 13:35:17,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:17,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:17,363 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 13:35:17,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:17,580 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:17,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:17,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-21 13:35:17,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:17,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023978283] [2020-07-21 13:35:17,583 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:17,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:17,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:17,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:17,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:17,720 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 13:35:17,721 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:17,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023978283] [2020-07-21 13:35:17,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:17,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:17,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068291117] [2020-07-21 13:35:17,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:17,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:17,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:17,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:17,728 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-21 13:35:17,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:17,807 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-21 13:35:17,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:17,812 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:17,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:17,815 INFO L225 Difference]: With dead ends: 127 [2020-07-21 13:35:17,815 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:35:17,818 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 13:35:17,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:35:17,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-21 13:35:17,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 13:35:17,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-21 13:35:17,838 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-21 13:35:17,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:17,838 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-21 13:35:17,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:17,839 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-21 13:35:17,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:17,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:17,840 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 13:35:18,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:18,055 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:18,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:18,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-21 13:35:18,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:18,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641345157] [2020-07-21 13:35:18,059 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:18,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:18,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:18,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:18,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:18,161 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 13:35:18,162 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:18,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641345157] [2020-07-21 13:35:18,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:18,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:18,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165566754] [2020-07-21 13:35:18,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:18,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:18,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:18,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:18,168 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-21 13:35:18,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:18,247 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 13:35:18,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:18,252 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:18,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:18,261 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:35:18,261 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 13:35:18,263 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 13:35:18,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 13:35:18,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-07-21 13:35:18,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 13:35:18,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 139 transitions. [2020-07-21 13:35:18,306 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 139 transitions. Word has length 22 [2020-07-21 13:35:18,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:18,307 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 139 transitions. [2020-07-21 13:35:18,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:18,307 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 139 transitions. [2020-07-21 13:35:18,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:18,310 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:18,310 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 13:35:18,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:18,524 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:18,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:18,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1794675624, now seen corresponding path program 1 times [2020-07-21 13:35:18,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:18,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470365843] [2020-07-21 13:35:18,527 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:18,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:18,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:18,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:18,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:18,704 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 13:35:18,705 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:18,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470365843] [2020-07-21 13:35:18,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:18,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:18,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101004186] [2020-07-21 13:35:18,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:18,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:18,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:18,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:18,712 INFO L87 Difference]: Start difference. First operand 79 states and 139 transitions. Second operand 3 states. [2020-07-21 13:35:18,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:18,760 INFO L93 Difference]: Finished difference Result 148 states and 264 transitions. [2020-07-21 13:35:18,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:18,762 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:18,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:18,765 INFO L225 Difference]: With dead ends: 148 [2020-07-21 13:35:18,766 INFO L226 Difference]: Without dead ends: 146 [2020-07-21 13:35:18,767 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 13:35:18,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-21 13:35:18,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 104. [2020-07-21 13:35:18,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 13:35:18,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-21 13:35:18,786 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-21 13:35:18,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:18,787 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-21 13:35:18,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:18,787 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-21 13:35:18,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:18,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:18,814 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 13:35:19,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,031 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:19,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:19,032 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-21 13:35:19,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:19,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988195719] [2020-07-21 13:35:19,034 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:19,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:19,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:19,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:19,116 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 13:35:19,117 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:19,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988195719] [2020-07-21 13:35:19,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:19,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:19,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205607057] [2020-07-21 13:35:19,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:19,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:19,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:19,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:19,121 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-21 13:35:19,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:19,161 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-21 13:35:19,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:19,161 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:19,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:19,164 INFO L225 Difference]: With dead ends: 244 [2020-07-21 13:35:19,164 INFO L226 Difference]: Without dead ends: 148 [2020-07-21 13:35:19,165 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 13:35:19,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-21 13:35:19,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-21 13:35:19,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-21 13:35:19,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-21 13:35:19,181 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-21 13:35:19,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:19,182 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-21 13:35:19,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:19,183 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-21 13:35:19,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:19,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:19,185 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 13:35:19,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,402 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:19,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:19,404 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-21 13:35:19,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:19,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126420852] [2020-07-21 13:35:19,405 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,461 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:19,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:19,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:19,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:19,484 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 13:35:19,485 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:19,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126420852] [2020-07-21 13:35:19,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:19,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:19,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617429465] [2020-07-21 13:35:19,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:19,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:19,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:19,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:19,490 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-21 13:35:19,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:19,522 INFO L93 Difference]: Finished difference Result 219 states and 385 transitions. [2020-07-21 13:35:19,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:19,523 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:19,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:19,525 INFO L225 Difference]: With dead ends: 219 [2020-07-21 13:35:19,526 INFO L226 Difference]: Without dead ends: 150 [2020-07-21 13:35:19,527 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 13:35:19,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-21 13:35:19,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2020-07-21 13:35:19,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 13:35:19,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 258 transitions. [2020-07-21 13:35:19,544 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 258 transitions. Word has length 23 [2020-07-21 13:35:19,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:19,544 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 258 transitions. [2020-07-21 13:35:19,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:19,545 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 258 transitions. [2020-07-21 13:35:19,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:19,547 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:19,547 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 13:35:19,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,764 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:19,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:19,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1479280785, now seen corresponding path program 1 times [2020-07-21 13:35:19,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:19,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185543917] [2020-07-21 13:35:19,766 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:19,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:19,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:19,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:19,848 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 13:35:19,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:19,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185543917] [2020-07-21 13:35:19,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:19,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:19,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883978635] [2020-07-21 13:35:19,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:19,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:19,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:19,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:19,853 INFO L87 Difference]: Start difference. First operand 148 states and 258 transitions. Second operand 3 states. [2020-07-21 13:35:19,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:19,881 INFO L93 Difference]: Finished difference Result 276 states and 488 transitions. [2020-07-21 13:35:19,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:19,882 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:19,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:19,886 INFO L225 Difference]: With dead ends: 276 [2020-07-21 13:35:19,886 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 13:35:19,888 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 13:35:19,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 13:35:19,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 200. [2020-07-21 13:35:19,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 13:35:19,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-21 13:35:19,907 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-21 13:35:19,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:19,908 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-21 13:35:19,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:19,908 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-21 13:35:19,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:19,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:19,911 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 13:35:20,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:20,127 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:20,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:20,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-21 13:35:20,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:20,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [813628281] [2020-07-21 13:35:20,130 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:20,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:20,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:20,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:20,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:20,209 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 13:35:20,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:20,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [813628281] [2020-07-21 13:35:20,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:20,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:20,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058412958] [2020-07-21 13:35:20,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:20,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:20,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:20,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:20,218 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-21 13:35:20,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:20,295 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-21 13:35:20,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:20,296 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:20,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:20,306 INFO L225 Difference]: With dead ends: 472 [2020-07-21 13:35:20,307 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 13:35:20,321 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 13:35:20,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 13:35:20,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-21 13:35:20,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-21 13:35:20,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-21 13:35:20,377 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-21 13:35:20,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:20,382 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-21 13:35:20,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:20,383 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-21 13:35:20,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:35:20,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:20,403 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 13:35:20,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:20,622 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:20,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:20,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-21 13:35:20,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:20,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488632089] [2020-07-21 13:35:20,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:20,716 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:20,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:20,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:20,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:20,752 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 13:35:20,759 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:20,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488632089] [2020-07-21 13:35:20,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:20,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:20,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145258668] [2020-07-21 13:35:20,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:20,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:20,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:20,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:20,766 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-21 13:35:20,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:20,831 INFO L93 Difference]: Finished difference Result 420 states and 720 transitions. [2020-07-21 13:35:20,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:20,832 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:35:20,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:20,839 INFO L225 Difference]: With dead ends: 420 [2020-07-21 13:35:20,843 INFO L226 Difference]: Without dead ends: 286 [2020-07-21 13:35:20,848 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 13:35:20,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-21 13:35:20,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 284. [2020-07-21 13:35:20,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 13:35:20,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 482 transitions. [2020-07-21 13:35:20,877 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 482 transitions. Word has length 24 [2020-07-21 13:35:20,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:20,879 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 482 transitions. [2020-07-21 13:35:20,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:20,880 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 482 transitions. [2020-07-21 13:35:20,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:35:20,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:20,882 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 13:35:21,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:21,095 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:21,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:21,096 INFO L82 PathProgramCache]: Analyzing trace with hash 107285981, now seen corresponding path program 1 times [2020-07-21 13:35:21,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:21,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1235290410] [2020-07-21 13:35:21,098 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:21,152 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:21,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:21,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:21,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:21,179 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 13:35:21,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:21,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1235290410] [2020-07-21 13:35:21,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:21,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:21,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938861298] [2020-07-21 13:35:21,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:21,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:21,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:21,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:21,192 INFO L87 Difference]: Start difference. First operand 284 states and 482 transitions. Second operand 3 states. [2020-07-21 13:35:21,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:21,253 INFO L93 Difference]: Finished difference Result 524 states and 904 transitions. [2020-07-21 13:35:21,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:21,255 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:35:21,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:21,260 INFO L225 Difference]: With dead ends: 524 [2020-07-21 13:35:21,261 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 13:35:21,263 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 13:35:21,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 13:35:21,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 392. [2020-07-21 13:35:21,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-21 13:35:21,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 654 transitions. [2020-07-21 13:35:21,291 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 654 transitions. Word has length 24 [2020-07-21 13:35:21,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:21,292 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 654 transitions. [2020-07-21 13:35:21,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:21,292 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 654 transitions. [2020-07-21 13:35:21,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:35:21,295 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:21,295 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 13:35:21,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:21,508 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:21,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:21,509 INFO L82 PathProgramCache]: Analyzing trace with hash -903831269, now seen corresponding path program 1 times [2020-07-21 13:35:21,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:21,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781747876] [2020-07-21 13:35:21,511 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:21,564 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:21,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:21,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:21,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:21,589 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 13:35:21,590 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:21,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781747876] [2020-07-21 13:35:21,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:21,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:21,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337223154] [2020-07-21 13:35:21,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:21,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:21,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:21,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:21,595 INFO L87 Difference]: Start difference. First operand 392 states and 654 transitions. Second operand 3 states. [2020-07-21 13:35:21,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:21,643 INFO L93 Difference]: Finished difference Result 924 states and 1552 transitions. [2020-07-21 13:35:21,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:21,644 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:35:21,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:21,649 INFO L225 Difference]: With dead ends: 924 [2020-07-21 13:35:21,650 INFO L226 Difference]: Without dead ends: 546 [2020-07-21 13:35:21,652 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 13:35:21,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2020-07-21 13:35:21,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 544. [2020-07-21 13:35:21,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-21 13:35:21,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 902 transitions. [2020-07-21 13:35:21,683 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 902 transitions. Word has length 24 [2020-07-21 13:35:21,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:21,684 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 902 transitions. [2020-07-21 13:35:21,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:21,685 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 902 transitions. [2020-07-21 13:35:21,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:35:21,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:21,687 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 13:35:21,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:21,902 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:21,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:21,903 INFO L82 PathProgramCache]: Analyzing trace with hash -968887806, now seen corresponding path program 1 times [2020-07-21 13:35:21,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:21,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566224678] [2020-07-21 13:35:21,904 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:21,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:21,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:21,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:21,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:22,007 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 13:35:22,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:22,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566224678] [2020-07-21 13:35:22,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:22,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:22,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392688966] [2020-07-21 13:35:22,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:22,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:22,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:22,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:22,016 INFO L87 Difference]: Start difference. First operand 544 states and 902 transitions. Second operand 3 states. [2020-07-21 13:35:22,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:22,066 INFO L93 Difference]: Finished difference Result 996 states and 1680 transitions. [2020-07-21 13:35:22,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:22,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:35:22,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:22,076 INFO L225 Difference]: With dead ends: 996 [2020-07-21 13:35:22,077 INFO L226 Difference]: Without dead ends: 994 [2020-07-21 13:35:22,079 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 13:35:22,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2020-07-21 13:35:22,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 768. [2020-07-21 13:35:22,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 768 states. [2020-07-21 13:35:22,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 1246 transitions. [2020-07-21 13:35:22,118 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 1246 transitions. Word has length 25 [2020-07-21 13:35:22,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:22,118 INFO L479 AbstractCegarLoop]: Abstraction has 768 states and 1246 transitions. [2020-07-21 13:35:22,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:22,119 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 1246 transitions. [2020-07-21 13:35:22,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:35:22,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:22,121 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 13:35:22,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:22,336 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:22,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:22,336 INFO L82 PathProgramCache]: Analyzing trace with hash -1980005056, now seen corresponding path program 1 times [2020-07-21 13:35:22,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:22,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536533148] [2020-07-21 13:35:22,338 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:22,387 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:22,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:22,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:22,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:22,422 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 13:35:22,423 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:22,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536533148] [2020-07-21 13:35:22,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:22,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:22,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459650762] [2020-07-21 13:35:22,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:22,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:22,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:22,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:22,429 INFO L87 Difference]: Start difference. First operand 768 states and 1246 transitions. Second operand 3 states. [2020-07-21 13:35:22,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:22,477 INFO L93 Difference]: Finished difference Result 1148 states and 1856 transitions. [2020-07-21 13:35:22,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:22,478 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:35:22,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:22,484 INFO L225 Difference]: With dead ends: 1148 [2020-07-21 13:35:22,485 INFO L226 Difference]: Without dead ends: 778 [2020-07-21 13:35:22,488 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 13:35:22,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-21 13:35:22,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-21 13:35:22,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 13:35:22,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1238 transitions. [2020-07-21 13:35:22,533 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1238 transitions. Word has length 25 [2020-07-21 13:35:22,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:22,534 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1238 transitions. [2020-07-21 13:35:22,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:22,534 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1238 transitions. [2020-07-21 13:35:22,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:35:22,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:22,537 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 13:35:22,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:22,753 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:22,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:22,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1035098562, now seen corresponding path program 1 times [2020-07-21 13:35:22,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:22,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915167715] [2020-07-21 13:35:22,756 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:22,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:22,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:22,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:22,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:22,868 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 13:35:22,870 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:22,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915167715] [2020-07-21 13:35:22,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:22,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:22,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171432788] [2020-07-21 13:35:22,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:22,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:22,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:22,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:22,875 INFO L87 Difference]: Start difference. First operand 776 states and 1238 transitions. Second operand 3 states. [2020-07-21 13:35:22,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:22,938 INFO L93 Difference]: Finished difference Result 1820 states and 2920 transitions. [2020-07-21 13:35:22,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:22,939 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:35:22,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:22,950 INFO L225 Difference]: With dead ends: 1820 [2020-07-21 13:35:22,951 INFO L226 Difference]: Without dead ends: 1066 [2020-07-21 13:35:22,957 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 13:35:22,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2020-07-21 13:35:23,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1064. [2020-07-21 13:35:23,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1064 states. [2020-07-21 13:35:23,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1686 transitions. [2020-07-21 13:35:23,025 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1686 transitions. Word has length 25 [2020-07-21 13:35:23,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:23,026 INFO L479 AbstractCegarLoop]: Abstraction has 1064 states and 1686 transitions. [2020-07-21 13:35:23,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:23,027 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1686 transitions. [2020-07-21 13:35:23,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:35:23,031 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:23,031 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 13:35:23,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:23,247 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:23,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:23,247 INFO L82 PathProgramCache]: Analyzing trace with hash -991604848, now seen corresponding path program 1 times [2020-07-21 13:35:23,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:23,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123205665] [2020-07-21 13:35:23,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:23,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:23,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:23,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:23,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:23,354 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 13:35:23,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:23,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123205665] [2020-07-21 13:35:23,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:23,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:23,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984529911] [2020-07-21 13:35:23,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:23,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:23,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:23,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:23,358 INFO L87 Difference]: Start difference. First operand 1064 states and 1686 transitions. Second operand 3 states. [2020-07-21 13:35:23,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:23,424 INFO L93 Difference]: Finished difference Result 1916 states and 3096 transitions. [2020-07-21 13:35:23,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:23,425 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 13:35:23,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:23,446 INFO L225 Difference]: With dead ends: 1916 [2020-07-21 13:35:23,447 INFO L226 Difference]: Without dead ends: 1914 [2020-07-21 13:35:23,454 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 13:35:23,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1914 states. [2020-07-21 13:35:23,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1914 to 1528. [2020-07-21 13:35:23,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1528 states. [2020-07-21 13:35:23,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1528 states to 1528 states and 2358 transitions. [2020-07-21 13:35:23,547 INFO L78 Accepts]: Start accepts. Automaton has 1528 states and 2358 transitions. Word has length 26 [2020-07-21 13:35:23,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:23,548 INFO L479 AbstractCegarLoop]: Abstraction has 1528 states and 2358 transitions. [2020-07-21 13:35:23,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:23,549 INFO L276 IsEmpty]: Start isEmpty. Operand 1528 states and 2358 transitions. [2020-07-21 13:35:23,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:35:23,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:23,554 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 13:35:23,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:23,770 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:23,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:23,770 INFO L82 PathProgramCache]: Analyzing trace with hash -2002722098, now seen corresponding path program 1 times [2020-07-21 13:35:23,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:23,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281619734] [2020-07-21 13:35:23,771 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:23,830 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:23,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:23,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:23,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:23,853 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 13:35:23,854 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:23,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281619734] [2020-07-21 13:35:23,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:23,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:23,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986529849] [2020-07-21 13:35:23,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:23,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:23,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:23,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:23,868 INFO L87 Difference]: Start difference. First operand 1528 states and 2358 transitions. Second operand 3 states. [2020-07-21 13:35:23,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:23,927 INFO L93 Difference]: Finished difference Result 2284 states and 3512 transitions. [2020-07-21 13:35:23,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:23,928 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 13:35:23,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:23,941 INFO L225 Difference]: With dead ends: 2284 [2020-07-21 13:35:23,942 INFO L226 Difference]: Without dead ends: 1546 [2020-07-21 13:35:23,946 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 13:35:23,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-21 13:35:24,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-07-21 13:35:24,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 13:35:24,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2342 transitions. [2020-07-21 13:35:24,059 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2342 transitions. Word has length 26 [2020-07-21 13:35:24,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:24,060 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2342 transitions. [2020-07-21 13:35:24,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:24,061 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2342 transitions. [2020-07-21 13:35:24,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:35:24,068 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:24,069 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 13:35:24,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:24,285 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:24,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:24,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1012381520, now seen corresponding path program 1 times [2020-07-21 13:35:24,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:24,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393251754] [2020-07-21 13:35:24,287 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:24,363 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:24,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:24,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:24,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:24,376 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 13:35:24,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:24,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393251754] [2020-07-21 13:35:24,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:24,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:24,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47500673] [2020-07-21 13:35:24,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:24,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:24,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:24,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:24,379 INFO L87 Difference]: Start difference. First operand 1544 states and 2342 transitions. Second operand 3 states. [2020-07-21 13:35:24,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:24,449 INFO L93 Difference]: Finished difference Result 3596 states and 5480 transitions. [2020-07-21 13:35:24,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:24,451 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 13:35:24,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:24,468 INFO L225 Difference]: With dead ends: 3596 [2020-07-21 13:35:24,468 INFO L226 Difference]: Without dead ends: 2090 [2020-07-21 13:35:24,475 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 13:35:24,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2020-07-21 13:35:24,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 2088. [2020-07-21 13:35:24,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2088 states. [2020-07-21 13:35:24,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 3142 transitions. [2020-07-21 13:35:24,584 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 3142 transitions. Word has length 26 [2020-07-21 13:35:24,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:24,584 INFO L479 AbstractCegarLoop]: Abstraction has 2088 states and 3142 transitions. [2020-07-21 13:35:24,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:24,585 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 3142 transitions. [2020-07-21 13:35:24,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:35:24,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:24,591 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 13:35:24,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:24,808 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:24,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:24,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1695832809, now seen corresponding path program 1 times [2020-07-21 13:35:24,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:24,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833505005] [2020-07-21 13:35:24,810 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:24,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:24,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:24,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:24,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:24,883 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 13:35:24,883 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:24,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [833505005] [2020-07-21 13:35:24,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:24,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:24,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413269641] [2020-07-21 13:35:24,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:24,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:24,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:24,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:24,888 INFO L87 Difference]: Start difference. First operand 2088 states and 3142 transitions. Second operand 3 states. [2020-07-21 13:35:24,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:24,978 INFO L93 Difference]: Finished difference Result 3692 states and 5672 transitions. [2020-07-21 13:35:24,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:24,980 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 13:35:24,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:25,010 INFO L225 Difference]: With dead ends: 3692 [2020-07-21 13:35:25,011 INFO L226 Difference]: Without dead ends: 3690 [2020-07-21 13:35:25,016 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 13:35:25,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3690 states. [2020-07-21 13:35:25,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3690 to 3048. [2020-07-21 13:35:25,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3048 states. [2020-07-21 13:35:25,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3048 states to 3048 states and 4454 transitions. [2020-07-21 13:35:25,169 INFO L78 Accepts]: Start accepts. Automaton has 3048 states and 4454 transitions. Word has length 27 [2020-07-21 13:35:25,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:25,170 INFO L479 AbstractCegarLoop]: Abstraction has 3048 states and 4454 transitions. [2020-07-21 13:35:25,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:25,170 INFO L276 IsEmpty]: Start isEmpty. Operand 3048 states and 4454 transitions. [2020-07-21 13:35:25,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:35:25,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:25,180 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 13:35:25,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:25,395 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:25,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:25,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1588017237, now seen corresponding path program 1 times [2020-07-21 13:35:25,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:25,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105450544] [2020-07-21 13:35:25,396 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:25,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:25,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:25,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:25,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:25,451 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 13:35:25,451 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:25,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105450544] [2020-07-21 13:35:25,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:25,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:25,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360518988] [2020-07-21 13:35:25,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:25,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:25,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:25,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:25,454 INFO L87 Difference]: Start difference. First operand 3048 states and 4454 transitions. Second operand 3 states. [2020-07-21 13:35:25,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:25,581 INFO L93 Difference]: Finished difference Result 4556 states and 6632 transitions. [2020-07-21 13:35:25,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:25,583 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 13:35:25,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:25,606 INFO L225 Difference]: With dead ends: 4556 [2020-07-21 13:35:25,607 INFO L226 Difference]: Without dead ends: 3082 [2020-07-21 13:35:25,622 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 13:35:25,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3082 states. [2020-07-21 13:35:25,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3082 to 3080. [2020-07-21 13:35:25,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3080 states. [2020-07-21 13:35:25,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3080 states to 3080 states and 4422 transitions. [2020-07-21 13:35:25,787 INFO L78 Accepts]: Start accepts. Automaton has 3080 states and 4422 transitions. Word has length 27 [2020-07-21 13:35:25,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:25,788 INFO L479 AbstractCegarLoop]: Abstraction has 3080 states and 4422 transitions. [2020-07-21 13:35:25,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:25,788 INFO L276 IsEmpty]: Start isEmpty. Operand 3080 states and 4422 transitions. [2020-07-21 13:35:25,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:35:25,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:25,802 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 13:35:26,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:26,018 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:26,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:26,018 INFO L82 PathProgramCache]: Analyzing trace with hash 308153559, now seen corresponding path program 1 times [2020-07-21 13:35:26,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:26,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439615123] [2020-07-21 13:35:26,020 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:26,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:26,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:26,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:26,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:26,107 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 13:35:26,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:26,108 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439615123] [2020-07-21 13:35:26,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:26,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:26,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100624837] [2020-07-21 13:35:26,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:26,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:26,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:26,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:26,112 INFO L87 Difference]: Start difference. First operand 3080 states and 4422 transitions. Second operand 3 states. [2020-07-21 13:35:26,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:26,228 INFO L93 Difference]: Finished difference Result 7116 states and 10248 transitions. [2020-07-21 13:35:26,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:26,229 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 13:35:26,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:26,256 INFO L225 Difference]: With dead ends: 7116 [2020-07-21 13:35:26,257 INFO L226 Difference]: Without dead ends: 4106 [2020-07-21 13:35:26,268 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 13:35:26,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4106 states. [2020-07-21 13:35:26,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4106 to 4104. [2020-07-21 13:35:26,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4104 states. [2020-07-21 13:35:26,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4104 states to 4104 states and 5830 transitions. [2020-07-21 13:35:26,438 INFO L78 Accepts]: Start accepts. Automaton has 4104 states and 5830 transitions. Word has length 27 [2020-07-21 13:35:26,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:26,439 INFO L479 AbstractCegarLoop]: Abstraction has 4104 states and 5830 transitions. [2020-07-21 13:35:26,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:26,439 INFO L276 IsEmpty]: Start isEmpty. Operand 4104 states and 5830 transitions. [2020-07-21 13:35:26,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 13:35:26,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:26,449 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 13:35:26,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:26,664 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:26,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:26,664 INFO L82 PathProgramCache]: Analyzing trace with hash -2052062779, now seen corresponding path program 1 times [2020-07-21 13:35:26,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:26,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1904767660] [2020-07-21 13:35:26,666 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:26,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:26,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:26,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:26,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:26,744 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 13:35:26,744 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:26,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1904767660] [2020-07-21 13:35:26,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:26,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:26,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685797964] [2020-07-21 13:35:26,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:26,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:26,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:26,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:26,747 INFO L87 Difference]: Start difference. First operand 4104 states and 5830 transitions. Second operand 3 states. [2020-07-21 13:35:26,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:26,846 INFO L93 Difference]: Finished difference Result 6156 states and 8712 transitions. [2020-07-21 13:35:26,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:26,847 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 13:35:26,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:26,908 INFO L225 Difference]: With dead ends: 6156 [2020-07-21 13:35:26,908 INFO L226 Difference]: Without dead ends: 4170 [2020-07-21 13:35:26,927 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 13:35:26,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4170 states. [2020-07-21 13:35:27,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4170 to 4168. [2020-07-21 13:35:27,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4168 states. [2020-07-21 13:35:27,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4168 states to 4168 states and 5830 transitions. [2020-07-21 13:35:27,184 INFO L78 Accepts]: Start accepts. Automaton has 4168 states and 5830 transitions. Word has length 28 [2020-07-21 13:35:27,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:27,185 INFO L479 AbstractCegarLoop]: Abstraction has 4168 states and 5830 transitions. [2020-07-21 13:35:27,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:27,185 INFO L276 IsEmpty]: Start isEmpty. Operand 4168 states and 5830 transitions. [2020-07-21 13:35:27,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 13:35:27,194 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:27,195 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, 1, 1, 1, 1] [2020-07-21 13:35:27,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:27,410 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:27,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:27,411 INFO L82 PathProgramCache]: Analyzing trace with hash 963040839, now seen corresponding path program 1 times [2020-07-21 13:35:27,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:27,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116987757] [2020-07-21 13:35:27,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:27,462 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:27,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:27,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:27,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:27,476 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 13:35:27,476 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:27,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116987757] [2020-07-21 13:35:27,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:27,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:27,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701879322] [2020-07-21 13:35:27,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:27,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:27,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:27,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:27,479 INFO L87 Difference]: Start difference. First operand 4168 states and 5830 transitions. Second operand 3 states. [2020-07-21 13:35:27,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:27,620 INFO L93 Difference]: Finished difference Result 12108 states and 16712 transitions. [2020-07-21 13:35:27,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:27,621 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 13:35:27,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:27,655 INFO L225 Difference]: With dead ends: 12108 [2020-07-21 13:35:27,656 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 13:35:27,672 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 13:35:27,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 13:35:27,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 8072. [2020-07-21 13:35:27,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 13:35:27,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10886 transitions. [2020-07-21 13:35:27,979 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10886 transitions. Word has length 28 [2020-07-21 13:35:27,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:27,980 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10886 transitions. [2020-07-21 13:35:27,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:27,980 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10886 transitions. [2020-07-21 13:35:27,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 13:35:27,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:27,994 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 13:35:28,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:28,210 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:28,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:28,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1974158089, now seen corresponding path program 1 times [2020-07-21 13:35:28,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:28,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648985811] [2020-07-21 13:35:28,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:28,254 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:28,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:28,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:28,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:28,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:28,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:28,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648985811] [2020-07-21 13:35:28,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:28,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:28,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448229014] [2020-07-21 13:35:28,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:28,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:28,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:28,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:28,269 INFO L87 Difference]: Start difference. First operand 8072 states and 10886 transitions. Second operand 3 states. [2020-07-21 13:35:28,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:28,481 INFO L93 Difference]: Finished difference Result 9100 states and 12680 transitions. [2020-07-21 13:35:28,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:28,482 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 13:35:28,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:28,514 INFO L225 Difference]: With dead ends: 9100 [2020-07-21 13:35:28,515 INFO L226 Difference]: Without dead ends: 9098 [2020-07-21 13:35:28,519 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 13:35:28,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9098 states. [2020-07-21 13:35:28,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9098 to 8072. [2020-07-21 13:35:28,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 13:35:28,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10758 transitions. [2020-07-21 13:35:28,804 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10758 transitions. Word has length 28 [2020-07-21 13:35:28,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:28,805 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10758 transitions. [2020-07-21 13:35:28,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:28,805 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10758 transitions. [2020-07-21 13:35:28,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 13:35:28,823 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:28,823 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 13:35:29,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:29,037 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:29,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:29,038 INFO L82 PathProgramCache]: Analyzing trace with hash -210289620, now seen corresponding path program 1 times [2020-07-21 13:35:29,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:29,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172503694] [2020-07-21 13:35:29,039 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:29,079 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:29,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:29,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:29,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:29,090 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 13:35:29,091 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:29,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172503694] [2020-07-21 13:35:29,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:29,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:29,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359563310] [2020-07-21 13:35:29,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:29,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:29,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:29,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:29,093 INFO L87 Difference]: Start difference. First operand 8072 states and 10758 transitions. Second operand 3 states. [2020-07-21 13:35:29,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:29,288 INFO L93 Difference]: Finished difference Result 13708 states and 18568 transitions. [2020-07-21 13:35:29,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:29,290 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 13:35:29,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:29,346 INFO L225 Difference]: With dead ends: 13708 [2020-07-21 13:35:29,347 INFO L226 Difference]: Without dead ends: 13706 [2020-07-21 13:35:29,360 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 13:35:29,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13706 states. [2020-07-21 13:35:29,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13706 to 12168. [2020-07-21 13:35:29,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12168 states. [2020-07-21 13:35:29,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12168 states to 12168 states and 15750 transitions. [2020-07-21 13:35:29,889 INFO L78 Accepts]: Start accepts. Automaton has 12168 states and 15750 transitions. Word has length 29 [2020-07-21 13:35:29,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:29,889 INFO L479 AbstractCegarLoop]: Abstraction has 12168 states and 15750 transitions. [2020-07-21 13:35:29,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:29,890 INFO L276 IsEmpty]: Start isEmpty. Operand 12168 states and 15750 transitions. [2020-07-21 13:35:29,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 13:35:29,922 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:29,922 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 13:35:30,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:30,137 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:30,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:30,138 INFO L82 PathProgramCache]: Analyzing trace with hash -1221406870, now seen corresponding path program 1 times [2020-07-21 13:35:30,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:30,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900316009] [2020-07-21 13:35:30,140 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:30,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:30,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:30,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:30,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:30,207 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 13:35:30,208 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:30,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900316009] [2020-07-21 13:35:30,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:30,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:30,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011693982] [2020-07-21 13:35:30,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:30,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:30,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:30,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:30,211 INFO L87 Difference]: Start difference. First operand 12168 states and 15750 transitions. Second operand 3 states. [2020-07-21 13:35:30,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:30,526 INFO L93 Difference]: Finished difference Result 27788 states and 35976 transitions. [2020-07-21 13:35:30,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:30,527 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 13:35:30,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:30,598 INFO L225 Difference]: With dead ends: 27788 [2020-07-21 13:35:30,599 INFO L226 Difference]: Without dead ends: 15754 [2020-07-21 13:35:30,643 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 13:35:30,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15754 states. [2020-07-21 13:35:31,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15754 to 15752. [2020-07-21 13:35:31,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15752 states. [2020-07-21 13:35:31,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15752 states to 15752 states and 19974 transitions. [2020-07-21 13:35:31,320 INFO L78 Accepts]: Start accepts. Automaton has 15752 states and 19974 transitions. Word has length 29 [2020-07-21 13:35:31,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:31,320 INFO L479 AbstractCegarLoop]: Abstraction has 15752 states and 19974 transitions. [2020-07-21 13:35:31,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:31,320 INFO L276 IsEmpty]: Start isEmpty. Operand 15752 states and 19974 transitions. [2020-07-21 13:35:31,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 13:35:31,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:31,346 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 13:35:31,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:31,561 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:31,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:31,562 INFO L82 PathProgramCache]: Analyzing trace with hash 2071172156, now seen corresponding path program 1 times [2020-07-21 13:35:31,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:31,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1681104765] [2020-07-21 13:35:31,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:31,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:31,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:31,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:31,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:31,635 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 13:35:31,636 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:31,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1681104765] [2020-07-21 13:35:31,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:31,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:31,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522290778] [2020-07-21 13:35:31,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:31,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:31,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:31,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:31,639 INFO L87 Difference]: Start difference. First operand 15752 states and 19974 transitions. Second operand 3 states. [2020-07-21 13:35:32,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:32,674 INFO L93 Difference]: Finished difference Result 26252 states and 33544 transitions. [2020-07-21 13:35:32,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:32,675 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 13:35:32,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:32,778 INFO L225 Difference]: With dead ends: 26252 [2020-07-21 13:35:32,779 INFO L226 Difference]: Without dead ends: 26250 [2020-07-21 13:35:32,791 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 13:35:32,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26250 states. [2020-07-21 13:35:33,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26250 to 24200. [2020-07-21 13:35:33,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24200 states. [2020-07-21 13:35:33,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24200 states to 24200 states and 29958 transitions. [2020-07-21 13:35:33,547 INFO L78 Accepts]: Start accepts. Automaton has 24200 states and 29958 transitions. Word has length 30 [2020-07-21 13:35:33,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:33,548 INFO L479 AbstractCegarLoop]: Abstraction has 24200 states and 29958 transitions. [2020-07-21 13:35:33,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:33,548 INFO L276 IsEmpty]: Start isEmpty. Operand 24200 states and 29958 transitions. [2020-07-21 13:35:33,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 13:35:33,615 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:33,615 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 13:35:33,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:33,831 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:33,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:33,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1060054906, now seen corresponding path program 1 times [2020-07-21 13:35:33,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:33,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210508179] [2020-07-21 13:35:33,833 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:33,889 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:33,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:33,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:33,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:33,912 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 13:35:33,912 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:33,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210508179] [2020-07-21 13:35:33,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:33,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:33,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113454156] [2020-07-21 13:35:33,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:33,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:33,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:33,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:33,915 INFO L87 Difference]: Start difference. First operand 24200 states and 29958 transitions. Second operand 3 states. [2020-07-21 13:35:34,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:34,414 INFO L93 Difference]: Finished difference Result 36364 states and 44936 transitions. [2020-07-21 13:35:34,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:34,415 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 13:35:34,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:34,523 INFO L225 Difference]: With dead ends: 36364 [2020-07-21 13:35:34,523 INFO L226 Difference]: Without dead ends: 24586 [2020-07-21 13:35:34,563 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 13:35:34,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24586 states. [2020-07-21 13:35:35,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24586 to 24584. [2020-07-21 13:35:35,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24584 states. [2020-07-21 13:35:35,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24584 states to 24584 states and 29958 transitions. [2020-07-21 13:35:35,244 INFO L78 Accepts]: Start accepts. Automaton has 24584 states and 29958 transitions. Word has length 30 [2020-07-21 13:35:35,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:35,245 INFO L479 AbstractCegarLoop]: Abstraction has 24584 states and 29958 transitions. [2020-07-21 13:35:35,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:35,245 INFO L276 IsEmpty]: Start isEmpty. Operand 24584 states and 29958 transitions. [2020-07-21 13:35:35,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 13:35:35,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:35,300 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 13:35:35,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:35,515 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:35,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:35,516 INFO L82 PathProgramCache]: Analyzing trace with hash -219808772, now seen corresponding path program 1 times [2020-07-21 13:35:35,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:35,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976973634] [2020-07-21 13:35:35,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:35,564 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:35,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:35,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:35,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:35,576 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 13:35:35,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:35,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976973634] [2020-07-21 13:35:35,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:35,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:35,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472005019] [2020-07-21 13:35:35,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:35,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:35,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:35,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:35,579 INFO L87 Difference]: Start difference. First operand 24584 states and 29958 transitions. Second operand 3 states. [2020-07-21 13:35:36,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:36,274 INFO L93 Difference]: Finished difference Result 55308 states and 66824 transitions. [2020-07-21 13:35:36,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:36,275 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 13:35:36,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:36,387 INFO L225 Difference]: With dead ends: 55308 [2020-07-21 13:35:36,388 INFO L226 Difference]: Without dead ends: 31242 [2020-07-21 13:35:36,461 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 13:35:36,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31242 states. [2020-07-21 13:35:37,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31242 to 31240. [2020-07-21 13:35:37,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31240 states. [2020-07-21 13:35:37,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31240 states to 31240 states and 36870 transitions. [2020-07-21 13:35:37,737 INFO L78 Accepts]: Start accepts. Automaton has 31240 states and 36870 transitions. Word has length 30 [2020-07-21 13:35:37,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:37,737 INFO L479 AbstractCegarLoop]: Abstraction has 31240 states and 36870 transitions. [2020-07-21 13:35:37,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:37,737 INFO L276 IsEmpty]: Start isEmpty. Operand 31240 states and 36870 transitions. [2020-07-21 13:35:37,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:35:37,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:37,774 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 13:35:37,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:37,981 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:37,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:37,981 INFO L82 PathProgramCache]: Analyzing trace with hash -1239024833, now seen corresponding path program 1 times [2020-07-21 13:35:37,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:37,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669260188] [2020-07-21 13:35:37,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:38,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:38,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:38,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:38,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:38,049 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 13:35:38,050 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:38,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669260188] [2020-07-21 13:35:38,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:38,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:38,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848549600] [2020-07-21 13:35:38,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:38,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:38,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:38,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:38,053 INFO L87 Difference]: Start difference. First operand 31240 states and 36870 transitions. Second operand 3 states. [2020-07-21 13:35:38,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:38,509 INFO L93 Difference]: Finished difference Result 50698 states and 59399 transitions. [2020-07-21 13:35:38,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:38,510 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 13:35:38,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:38,673 INFO L225 Difference]: With dead ends: 50698 [2020-07-21 13:35:38,674 INFO L226 Difference]: Without dead ends: 50696 [2020-07-21 13:35:38,717 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 13:35:38,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50696 states. [2020-07-21 13:35:40,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50696 to 48648. [2020-07-21 13:35:40,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48648 states. [2020-07-21 13:35:40,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48648 states to 48648 states and 56326 transitions. [2020-07-21 13:35:40,768 INFO L78 Accepts]: Start accepts. Automaton has 48648 states and 56326 transitions. Word has length 31 [2020-07-21 13:35:40,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:40,769 INFO L479 AbstractCegarLoop]: Abstraction has 48648 states and 56326 transitions. [2020-07-21 13:35:40,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:40,769 INFO L276 IsEmpty]: Start isEmpty. Operand 48648 states and 56326 transitions. [2020-07-21 13:35:40,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:35:40,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:40,846 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 13:35:41,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:41,053 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:41,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:41,054 INFO L82 PathProgramCache]: Analyzing trace with hash 2044825213, now seen corresponding path program 1 times [2020-07-21 13:35:41,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:41,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566899704] [2020-07-21 13:35:41,055 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:41,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:41,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:41,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:41,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:41,119 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 13:35:41,120 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:41,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566899704] [2020-07-21 13:35:41,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:41,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:41,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077534399] [2020-07-21 13:35:41,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:41,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:41,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:41,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:41,123 INFO L87 Difference]: Start difference. First operand 48648 states and 56326 transitions. Second operand 3 states. [2020-07-21 13:35:41,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:41,787 INFO L93 Difference]: Finished difference Result 72716 states and 83720 transitions. [2020-07-21 13:35:41,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:41,788 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 13:35:41,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:41,943 INFO L225 Difference]: With dead ends: 72716 [2020-07-21 13:35:41,944 INFO L226 Difference]: Without dead ends: 49162 [2020-07-21 13:35:42,005 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 13:35:42,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49162 states. [2020-07-21 13:35:43,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49162 to 49160. [2020-07-21 13:35:43,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49160 states. [2020-07-21 13:35:43,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49160 states to 49160 states and 55814 transitions. [2020-07-21 13:35:43,589 INFO L78 Accepts]: Start accepts. Automaton has 49160 states and 55814 transitions. Word has length 31 [2020-07-21 13:35:43,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:43,589 INFO L479 AbstractCegarLoop]: Abstraction has 49160 states and 55814 transitions. [2020-07-21 13:35:43,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:43,590 INFO L276 IsEmpty]: Start isEmpty. Operand 49160 states and 55814 transitions. [2020-07-21 13:35:43,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:35:43,666 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:43,666 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 13:35:43,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:43,877 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:43,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:43,877 INFO L82 PathProgramCache]: Analyzing trace with hash 764961535, now seen corresponding path program 1 times [2020-07-21 13:35:43,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:43,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949729206] [2020-07-21 13:35:43,879 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:35:43,916 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:43,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:43,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:43,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:43,924 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 13:35:43,925 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:43,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949729206] [2020-07-21 13:35:43,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:43,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:43,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845994975] [2020-07-21 13:35:43,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:43,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:43,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:43,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:43,927 INFO L87 Difference]: Start difference. First operand 49160 states and 55814 transitions. Second operand 3 states. [2020-07-21 13:35:45,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:45,919 INFO L93 Difference]: Finished difference Result 109576 states and 122374 transitions. [2020-07-21 13:35:45,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:45,920 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 13:35:45,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:45,921 INFO L225 Difference]: With dead ends: 109576 [2020-07-21 13:35:45,921 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:35:46,065 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 13:35:46,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:35:46,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:35:46,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:35:46,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:35:46,067 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-21 13:35:46,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:46,067 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:35:46,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:46,068 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:35:46,068 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:35:46,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:46,286 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:35:46,375 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:35:46,375 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:35:46,375 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:35:46,375 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:35:46,376 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:35:46,376 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:35:46,376 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-21 13:35:46,376 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-21 13:35:46,376 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-21 13:35:46,376 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-21 13:35:46,376 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-21 13:35:46,377 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-21 13:35:46,377 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,377 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,377 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,377 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,377 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-21 13:35:46,377 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,378 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-21 13:35:46,378 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,378 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,378 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-21 13:35:46,378 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,378 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-21 13:35:46,379 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,379 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,379 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-21 13:35:46,379 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-21 13:35:46,379 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-21 13:35:46,380 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-21 13:35:46,380 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,380 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,380 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-21 13:35:46,380 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-21 13:35:46,381 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-21 13:35:46,381 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,381 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,381 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,382 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,382 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,382 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,382 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,383 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-21 13:35:46,383 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-21 13:35:46,383 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,383 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 13:35:46,383 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-21 13:35:46,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:35:46 BoogieIcfgContainer [2020-07-21 13:35:46,408 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:35:46,412 INFO L168 Benchmark]: Toolchain (without parser) took 31115.83 ms. Allocated memory was 143.7 MB in the beginning and 1.1 GB in the end (delta: 961.0 MB). Free memory was 100.2 MB in the beginning and 863.7 MB in the end (delta: -763.4 MB). Peak memory consumption was 197.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:46,413 INFO L168 Benchmark]: CDTParser took 1.71 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 13:35:46,414 INFO L168 Benchmark]: CACSL2BoogieTranslator took 420.56 ms. Allocated memory is still 143.7 MB. Free memory was 99.8 MB in the beginning and 89.0 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:46,414 INFO L168 Benchmark]: Boogie Preprocessor took 192.55 ms. Allocated memory was 143.7 MB in the beginning and 201.3 MB in the end (delta: 57.7 MB). Free memory was 89.0 MB in the beginning and 179.1 MB in the end (delta: -90.1 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:46,415 INFO L168 Benchmark]: RCFGBuilder took 715.04 ms. Allocated memory is still 201.3 MB. Free memory was 179.1 MB in the beginning and 159.3 MB in the end (delta: 19.9 MB). Peak memory consumption was 19.9 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:46,415 INFO L168 Benchmark]: TraceAbstraction took 29776.86 ms. Allocated memory was 201.3 MB in the beginning and 1.1 GB in the end (delta: 903.3 MB). Free memory was 158.6 MB in the beginning and 863.7 MB in the end (delta: -705.1 MB). Peak memory consumption was 198.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:46,418 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.71 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 420.56 ms. Allocated memory is still 143.7 MB. Free memory was 99.8 MB in the beginning and 89.0 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 192.55 ms. Allocated memory was 143.7 MB in the beginning and 201.3 MB in the end (delta: 57.7 MB). Free memory was 89.0 MB in the beginning and 179.1 MB in the end (delta: -90.1 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 715.04 ms. Allocated memory is still 201.3 MB. Free memory was 179.1 MB in the beginning and 159.3 MB in the end (delta: 19.9 MB). Peak memory consumption was 19.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 29776.86 ms. Allocated memory was 201.3 MB in the beginning and 1.1 GB in the end (delta: 903.3 MB). Free memory was 158.6 MB in the beginning and 863.7 MB in the end (delta: -705.1 MB). Peak memory consumption was 198.3 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: 29.5s, OverallIterations: 31, TraceHistogramMax: 1, AutomataDifference: 9.4s, 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, 0.5s 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: 9.6s 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: 0.3s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 808 NumberOfCodeBlocks, 700 NumberOfCodeBlocksAsserted, 54 NumberOfCheckSat, 777 ConstructedInterpolants, 0 QuantifiedInterpolants, 39912 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3554 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...