/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_7.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:35:49,703 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:35:49,707 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:35:49,726 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:35:49,727 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:35:49,731 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:35:49,733 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:35:49,743 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:35:49,748 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:35:49,751 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:35:49,753 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:35:49,754 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:35:49,754 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:35:49,756 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:35:49,758 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:35:49,759 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:35:49,761 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:35:49,762 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:35:49,764 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:35:49,768 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:35:49,773 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:35:49,777 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:35:49,778 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:35:49,779 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:35:49,781 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:35:49,791 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:35:49,792 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:35:49,793 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:35:49,794 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 13:35:49,826 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:35:49,826 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:35:49,827 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:35:49,828 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:35:49,828 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:35:49,828 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:35:49,828 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:35:49,828 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:35:49,829 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:35:49,829 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:35:49,829 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:35:49,829 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:35:49,829 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:35:49,830 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:35:49,830 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:35:49,830 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:35:49,830 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:35:49,830 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:35:49,831 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:35:49,831 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:35:49,831 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:35:49,832 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:35:49,833 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:35:49,833 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:35:49,833 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:35:49,833 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:35:49,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:49,834 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:35:49,834 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:35:49,834 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 13:35:50,192 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:35:50,207 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:35:50,211 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:35:50,213 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:35:50,213 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:35:50,214 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 13:35:50,291 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58802de58/50cb4e0a99894595a0da113725347e06/FLAGa8db550ff [2020-07-21 13:35:50,752 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:35:50,753 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 13:35:50,760 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58802de58/50cb4e0a99894595a0da113725347e06/FLAGa8db550ff [2020-07-21 13:35:51,180 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58802de58/50cb4e0a99894595a0da113725347e06 [2020-07-21 13:35:51,191 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:35:51,195 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:35:51,196 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:51,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:35:51,200 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:35:51,201 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,205 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5138ac0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51, skipping insertion in model container [2020-07-21 13:35:51,205 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,213 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:35:51,245 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:35:51,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:51,431 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:35:51,456 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:51,478 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:35:51,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51 WrapperNode [2020-07-21 13:35:51,484 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:51,486 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:35:51,486 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:35:51,486 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:35:51,598 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,598 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,608 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,608 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,619 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,626 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,628 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,630 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:35:51,630 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:35:51,630 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:35:51,630 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:35:51,631 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (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 13:35:51,705 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:35:51,706 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:35:51,706 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:35:51,706 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:35:51,706 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:35:51,706 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:35:51,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:35:51,707 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:35:52,063 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:35:52,063 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 13:35:52,067 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:52 BoogieIcfgContainer [2020-07-21 13:35:52,067 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:35:52,069 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:35:52,069 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:35:52,072 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:35:52,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:35:51" (1/3) ... [2020-07-21 13:35:52,073 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a789a59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:52, skipping insertion in model container [2020-07-21 13:35:52,074 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51" (2/3) ... [2020-07-21 13:35:52,074 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a789a59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:52, skipping insertion in model container [2020-07-21 13:35:52,074 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:52" (3/3) ... [2020-07-21 13:35:52,076 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_7.c [2020-07-21 13:35:52,087 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:35:52,095 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:35:52,109 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:35:52,133 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:35:52,133 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:35:52,134 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:35:52,134 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:35:52,135 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:35:52,135 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:35:52,135 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:35:52,135 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:35:52,154 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-21 13:35:52,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 13:35:52,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:52,162 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:52,162 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:52,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:52,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1819770524, now seen corresponding path program 1 times [2020-07-21 13:35:52,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:52,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822039742] [2020-07-21 13:35:52,177 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 13:35:52,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:52,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:52,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:52,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:52,354 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 13:35:52,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:52,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822039742] [2020-07-21 13:35:52,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:52,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:52,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614708157] [2020-07-21 13:35:52,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:52,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:52,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:52,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:52,377 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2020-07-21 13:35:52,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:52,445 INFO L93 Difference]: Finished difference Result 69 states and 114 transitions. [2020-07-21 13:35:52,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:52,448 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 13:35:52,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:52,461 INFO L225 Difference]: With dead ends: 69 [2020-07-21 13:35:52,461 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 13:35:52,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 13:35:52,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 13:35:52,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 38. [2020-07-21 13:35:52,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 13:35:52,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 65 transitions. [2020-07-21 13:35:52,513 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 65 transitions. Word has length 17 [2020-07-21 13:35:52,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:52,513 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 65 transitions. [2020-07-21 13:35:52,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:52,514 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 65 transitions. [2020-07-21 13:35:52,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 13:35:52,515 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:52,515 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:52,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:52,729 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:52,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:52,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1426743514, now seen corresponding path program 1 times [2020-07-21 13:35:52,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:52,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401652251] [2020-07-21 13:35:52,731 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 13:35:52,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:52,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:52,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:52,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:52,827 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 13:35:52,827 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:52,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [401652251] [2020-07-21 13:35:52,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:52,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:52,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8683730] [2020-07-21 13:35:52,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:52,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:52,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:52,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:52,832 INFO L87 Difference]: Start difference. First operand 38 states and 65 transitions. Second operand 3 states. [2020-07-21 13:35:52,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:52,863 INFO L93 Difference]: Finished difference Result 87 states and 152 transitions. [2020-07-21 13:35:52,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:52,864 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 13:35:52,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:52,866 INFO L225 Difference]: With dead ends: 87 [2020-07-21 13:35:52,866 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 13:35:52,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 13:35:52,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 13:35:52,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2020-07-21 13:35:52,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 13:35:52,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 89 transitions. [2020-07-21 13:35:52,879 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 89 transitions. Word has length 17 [2020-07-21 13:35:52,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:52,879 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 89 transitions. [2020-07-21 13:35:52,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:52,880 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 89 transitions. [2020-07-21 13:35:52,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:35:52,881 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:52,881 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:53,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:53,096 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:53,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:53,097 INFO L82 PathProgramCache]: Analyzing trace with hash 578525748, now seen corresponding path program 1 times [2020-07-21 13:35:53,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:53,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1983744461] [2020-07-21 13:35:53,099 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 13:35:53,162 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:53,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:53,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:53,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:53,182 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 13:35:53,183 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:53,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1983744461] [2020-07-21 13:35:53,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:53,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:53,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078187036] [2020-07-21 13:35:53,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:53,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:53,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:53,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:53,189 INFO L87 Difference]: Start difference. First operand 52 states and 89 transitions. Second operand 3 states. [2020-07-21 13:35:53,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:53,222 INFO L93 Difference]: Finished difference Result 81 states and 135 transitions. [2020-07-21 13:35:53,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:53,225 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:35:53,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:53,227 INFO L225 Difference]: With dead ends: 81 [2020-07-21 13:35:53,227 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 13:35:53,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 13:35:53,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 13:35:53,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-21 13:35:53,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 13:35:53,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 91 transitions. [2020-07-21 13:35:53,247 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 91 transitions. Word has length 18 [2020-07-21 13:35:53,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:53,250 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 91 transitions. [2020-07-21 13:35:53,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:53,250 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 91 transitions. [2020-07-21 13:35:53,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:35:53,251 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:53,251 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:53,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:53,469 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:53,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:53,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1279590326, now seen corresponding path program 1 times [2020-07-21 13:35:53,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:53,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717806814] [2020-07-21 13:35:53,471 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 13:35:53,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:53,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:53,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:53,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:53,536 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 13:35:53,536 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:53,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717806814] [2020-07-21 13:35:53,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:53,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:53,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436796434] [2020-07-21 13:35:53,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:53,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:53,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:53,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:53,542 INFO L87 Difference]: Start difference. First operand 55 states and 91 transitions. Second operand 3 states. [2020-07-21 13:35:53,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:53,580 INFO L93 Difference]: Finished difference Result 100 states and 168 transitions. [2020-07-21 13:35:53,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:53,581 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:35:53,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:53,585 INFO L225 Difference]: With dead ends: 100 [2020-07-21 13:35:53,585 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 13:35:53,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 13:35:53,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 13:35:53,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 72. [2020-07-21 13:35:53,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 13:35:53,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 120 transitions. [2020-07-21 13:35:53,600 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 120 transitions. Word has length 18 [2020-07-21 13:35:53,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:53,600 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 120 transitions. [2020-07-21 13:35:53,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:53,601 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 120 transitions. [2020-07-21 13:35:53,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:35:53,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:53,602 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:53,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:53,812 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:53,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:53,813 INFO L82 PathProgramCache]: Analyzing trace with hash 886563316, now seen corresponding path program 1 times [2020-07-21 13:35:53,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:53,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774217027] [2020-07-21 13:35:53,815 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 13:35:53,869 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:53,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:53,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:53,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:53,881 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 13:35:53,882 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:53,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774217027] [2020-07-21 13:35:53,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:53,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:53,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935628504] [2020-07-21 13:35:53,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:53,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:53,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:53,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:53,884 INFO L87 Difference]: Start difference. First operand 72 states and 120 transitions. Second operand 3 states. [2020-07-21 13:35:53,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:53,908 INFO L93 Difference]: Finished difference Result 164 states and 278 transitions. [2020-07-21 13:35:53,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:53,909 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:35:53,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:53,910 INFO L225 Difference]: With dead ends: 164 [2020-07-21 13:35:53,911 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 13:35:53,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 13:35:53,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 13:35:53,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2020-07-21 13:35:53,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 13:35:53,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 162 transitions. [2020-07-21 13:35:53,922 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 162 transitions. Word has length 18 [2020-07-21 13:35:53,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:53,922 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 162 transitions. [2020-07-21 13:35:53,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:53,923 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 162 transitions. [2020-07-21 13:35:53,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:35:53,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:53,924 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:54,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:54,139 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:54,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:54,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1012809135, now seen corresponding path program 1 times [2020-07-21 13:35:54,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:54,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1760062380] [2020-07-21 13:35:54,141 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 13:35:54,192 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:54,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:54,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:54,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:54,216 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 13:35:54,217 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:54,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1760062380] [2020-07-21 13:35:54,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:54,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:54,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087462733] [2020-07-21 13:35:54,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:54,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:54,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:54,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,220 INFO L87 Difference]: Start difference. First operand 98 states and 162 transitions. Second operand 3 states. [2020-07-21 13:35:54,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:54,248 INFO L93 Difference]: Finished difference Result 147 states and 241 transitions. [2020-07-21 13:35:54,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:54,248 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:35:54,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:54,250 INFO L225 Difference]: With dead ends: 147 [2020-07-21 13:35:54,256 INFO L226 Difference]: Without dead ends: 102 [2020-07-21 13:35:54,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-21 13:35:54,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2020-07-21 13:35:54,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-21 13:35:54,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 162 transitions. [2020-07-21 13:35:54,277 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 162 transitions. Word has length 19 [2020-07-21 13:35:54,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:54,277 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 162 transitions. [2020-07-21 13:35:54,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:54,277 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 162 transitions. [2020-07-21 13:35:54,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:35:54,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:54,279 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:54,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:54,492 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:54,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:54,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1713873713, now seen corresponding path program 1 times [2020-07-21 13:35:54,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:54,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [415243988] [2020-07-21 13:35:54,495 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 13:35:54,523 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:54,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:54,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:54,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:54,535 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:54,536 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:54,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [415243988] [2020-07-21 13:35:54,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:54,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:54,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989854154] [2020-07-21 13:35:54,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:54,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:54,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:54,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,538 INFO L87 Difference]: Start difference. First operand 100 states and 162 transitions. Second operand 3 states. [2020-07-21 13:35:54,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:54,556 INFO L93 Difference]: Finished difference Result 180 states and 296 transitions. [2020-07-21 13:35:54,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:54,556 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:35:54,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:54,558 INFO L225 Difference]: With dead ends: 180 [2020-07-21 13:35:54,558 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 13:35:54,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 13:35:54,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 136. [2020-07-21 13:35:54,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 13:35:54,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 218 transitions. [2020-07-21 13:35:54,571 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 218 transitions. Word has length 19 [2020-07-21 13:35:54,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:54,571 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 218 transitions. [2020-07-21 13:35:54,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:54,572 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 218 transitions. [2020-07-21 13:35:54,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:35:54,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:54,573 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:54,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:54,790 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:54,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:54,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1320846703, now seen corresponding path program 1 times [2020-07-21 13:35:54,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:54,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677806866] [2020-07-21 13:35:54,793 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 13:35:54,838 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:54,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:54,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:54,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:54,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:54,855 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:54,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677806866] [2020-07-21 13:35:54,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:54,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:54,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020118591] [2020-07-21 13:35:54,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:54,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:54,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:54,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,863 INFO L87 Difference]: Start difference. First operand 136 states and 218 transitions. Second operand 3 states. [2020-07-21 13:35:54,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:54,888 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-21 13:35:54,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:54,889 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:35:54,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:54,891 INFO L225 Difference]: With dead ends: 312 [2020-07-21 13:35:54,891 INFO L226 Difference]: Without dead ends: 186 [2020-07-21 13:35:54,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-21 13:35:54,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2020-07-21 13:35:54,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 13:35:54,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 290 transitions. [2020-07-21 13:35:54,906 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 290 transitions. Word has length 19 [2020-07-21 13:35:54,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:54,906 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 290 transitions. [2020-07-21 13:35:54,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:54,907 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 290 transitions. [2020-07-21 13:35:54,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:54,908 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:54,909 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:55,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,124 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:55,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:55,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1590692585, now seen corresponding path program 1 times [2020-07-21 13:35:55,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:55,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105040606] [2020-07-21 13:35:55,126 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 13:35:55,157 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:55,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:55,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:55,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:55,173 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 13:35:55,173 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:55,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105040606] [2020-07-21 13:35:55,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:55,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:55,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603079160] [2020-07-21 13:35:55,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:55,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:55,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:55,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,175 INFO L87 Difference]: Start difference. First operand 184 states and 290 transitions. Second operand 3 states. [2020-07-21 13:35:55,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:55,204 INFO L93 Difference]: Finished difference Result 328 states and 524 transitions. [2020-07-21 13:35:55,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:55,204 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:55,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:55,207 INFO L225 Difference]: With dead ends: 328 [2020-07-21 13:35:55,207 INFO L226 Difference]: Without dead ends: 326 [2020-07-21 13:35:55,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2020-07-21 13:35:55,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 260. [2020-07-21 13:35:55,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-21 13:35:55,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 402 transitions. [2020-07-21 13:35:55,224 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 402 transitions. Word has length 20 [2020-07-21 13:35:55,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:55,225 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 402 transitions. [2020-07-21 13:35:55,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:55,225 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 402 transitions. [2020-07-21 13:35:55,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:55,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:55,227 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:55,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,442 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:55,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:55,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1197665575, now seen corresponding path program 1 times [2020-07-21 13:35:55,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:55,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12978566] [2020-07-21 13:35:55,444 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 13:35:55,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:55,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:55,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:55,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:55,516 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 13:35:55,517 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:55,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12978566] [2020-07-21 13:35:55,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:55,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:55,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091096646] [2020-07-21 13:35:55,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:55,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:55,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:55,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,519 INFO L87 Difference]: Start difference. First operand 260 states and 402 transitions. Second operand 3 states. [2020-07-21 13:35:55,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:55,537 INFO L93 Difference]: Finished difference Result 388 states and 596 transitions. [2020-07-21 13:35:55,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:55,537 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:55,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:55,539 INFO L225 Difference]: With dead ends: 388 [2020-07-21 13:35:55,539 INFO L226 Difference]: Without dead ends: 266 [2020-07-21 13:35:55,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-07-21 13:35:55,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 264. [2020-07-21 13:35:55,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-21 13:35:55,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 398 transitions. [2020-07-21 13:35:55,553 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 398 transitions. Word has length 20 [2020-07-21 13:35:55,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:55,553 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 398 transitions. [2020-07-21 13:35:55,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:55,553 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 398 transitions. [2020-07-21 13:35:55,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:55,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:55,555 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:55,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,769 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:55,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:55,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1898730153, now seen corresponding path program 1 times [2020-07-21 13:35:55,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:55,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301662184] [2020-07-21 13:35:55,771 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 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 13:35:55,799 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:55,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:55,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:55,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:55,814 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 13:35:55,814 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:55,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301662184] [2020-07-21 13:35:55,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:55,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:55,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895052411] [2020-07-21 13:35:55,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:55,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:55,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:55,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,816 INFO L87 Difference]: Start difference. First operand 264 states and 398 transitions. Second operand 3 states. [2020-07-21 13:35:55,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:55,844 INFO L93 Difference]: Finished difference Result 604 states and 912 transitions. [2020-07-21 13:35:55,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:55,845 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:55,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:55,848 INFO L225 Difference]: With dead ends: 604 [2020-07-21 13:35:55,848 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 13:35:55,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 13:35:55,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 352. [2020-07-21 13:35:55,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 13:35:55,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 518 transitions. [2020-07-21 13:35:55,865 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 518 transitions. Word has length 20 [2020-07-21 13:35:55,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:55,866 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 518 transitions. [2020-07-21 13:35:55,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:55,866 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 518 transitions. [2020-07-21 13:35:55,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:55,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:55,868 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 13:35:56,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,081 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:56,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:56,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1969756604, now seen corresponding path program 1 times [2020-07-21 13:35:56,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:56,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946113361] [2020-07-21 13:35:56,083 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 13:35:56,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:56,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:56,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:56,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:56,136 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 13:35:56,137 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:56,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946113361] [2020-07-21 13:35:56,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:56,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:56,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370224097] [2020-07-21 13:35:56,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:56,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:56,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:56,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:56,139 INFO L87 Difference]: Start difference. First operand 352 states and 518 transitions. Second operand 3 states. [2020-07-21 13:35:56,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:56,178 INFO L93 Difference]: Finished difference Result 612 states and 912 transitions. [2020-07-21 13:35:56,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:56,179 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:56,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:56,184 INFO L225 Difference]: With dead ends: 612 [2020-07-21 13:35:56,184 INFO L226 Difference]: Without dead ends: 610 [2020-07-21 13:35:56,185 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 13:35:56,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-21 13:35:56,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 512. [2020-07-21 13:35:56,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-07-21 13:35:56,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 734 transitions. [2020-07-21 13:35:56,209 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 734 transitions. Word has length 21 [2020-07-21 13:35:56,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:56,211 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 734 transitions. [2020-07-21 13:35:56,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:56,212 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 734 transitions. [2020-07-21 13:35:56,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:56,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:56,215 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 13:35:56,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,430 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:56,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:56,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1932183682, now seen corresponding path program 1 times [2020-07-21 13:35:56,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:56,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482099230] [2020-07-21 13:35:56,433 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 13:35:56,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:56,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:56,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:56,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:56,488 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 13:35:56,489 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:56,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482099230] [2020-07-21 13:35:56,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:56,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:56,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860592142] [2020-07-21 13:35:56,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:56,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:56,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:56,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:56,492 INFO L87 Difference]: Start difference. First operand 512 states and 734 transitions. Second operand 3 states. [2020-07-21 13:35:56,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:56,516 INFO L93 Difference]: Finished difference Result 764 states and 1088 transitions. [2020-07-21 13:35:56,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:56,517 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:56,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:56,521 INFO L225 Difference]: With dead ends: 764 [2020-07-21 13:35:56,521 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 13:35:56,523 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 13:35:56,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 13:35:56,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 520. [2020-07-21 13:35:56,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 520 states. [2020-07-21 13:35:56,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 726 transitions. [2020-07-21 13:35:56,547 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 726 transitions. Word has length 21 [2020-07-21 13:35:56,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:56,547 INFO L479 AbstractCegarLoop]: Abstraction has 520 states and 726 transitions. [2020-07-21 13:35:56,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:56,547 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 726 transitions. [2020-07-21 13:35:56,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:56,550 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:56,550 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 13:35:56,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,765 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:56,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:56,766 INFO L82 PathProgramCache]: Analyzing trace with hash -1661719036, now seen corresponding path program 1 times [2020-07-21 13:35:56,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:56,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [733103587] [2020-07-21 13:35:56,767 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 13:35:56,808 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:56,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:56,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:56,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:56,830 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 13:35:56,830 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:56,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [733103587] [2020-07-21 13:35:56,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:56,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:56,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644875574] [2020-07-21 13:35:56,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:56,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:56,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:56,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:56,834 INFO L87 Difference]: Start difference. First operand 520 states and 726 transitions. Second operand 3 states. [2020-07-21 13:35:56,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:56,868 INFO L93 Difference]: Finished difference Result 1180 states and 1640 transitions. [2020-07-21 13:35:56,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:56,868 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:56,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:56,873 INFO L225 Difference]: With dead ends: 1180 [2020-07-21 13:35:56,873 INFO L226 Difference]: Without dead ends: 682 [2020-07-21 13:35:56,875 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 13:35:56,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2020-07-21 13:35:56,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 680. [2020-07-21 13:35:56,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-07-21 13:35:56,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 918 transitions. [2020-07-21 13:35:56,900 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 918 transitions. Word has length 21 [2020-07-21 13:35:56,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:56,901 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 918 transitions. [2020-07-21 13:35:56,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:56,901 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 918 transitions. [2020-07-21 13:35:56,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:56,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:56,903 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 13:35:57,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:57,117 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:57,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:57,118 INFO L82 PathProgramCache]: Analyzing trace with hash -674531426, now seen corresponding path program 1 times [2020-07-21 13:35:57,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:57,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438933436] [2020-07-21 13:35:57,119 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 13:35:57,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:57,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:57,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:57,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:57,167 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 13:35:57,168 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:57,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438933436] [2020-07-21 13:35:57,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:57,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:57,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678901191] [2020-07-21 13:35:57,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:57,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:57,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:57,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,170 INFO L87 Difference]: Start difference. First operand 680 states and 918 transitions. Second operand 3 states. [2020-07-21 13:35:57,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:57,206 INFO L93 Difference]: Finished difference Result 1148 states and 1560 transitions. [2020-07-21 13:35:57,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:57,207 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:57,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:57,214 INFO L225 Difference]: With dead ends: 1148 [2020-07-21 13:35:57,214 INFO L226 Difference]: Without dead ends: 1146 [2020-07-21 13:35:57,215 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 13:35:57,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1146 states. [2020-07-21 13:35:57,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1146 to 1016. [2020-07-21 13:35:57,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1016 states. [2020-07-21 13:35:57,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1016 states to 1016 states and 1334 transitions. [2020-07-21 13:35:57,253 INFO L78 Accepts]: Start accepts. Automaton has 1016 states and 1334 transitions. Word has length 22 [2020-07-21 13:35:57,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:57,253 INFO L479 AbstractCegarLoop]: Abstraction has 1016 states and 1334 transitions. [2020-07-21 13:35:57,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:57,254 INFO L276 IsEmpty]: Start isEmpty. Operand 1016 states and 1334 transitions. [2020-07-21 13:35:57,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:57,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:57,257 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 13:35:57,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:57,473 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:57,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:57,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1067558436, now seen corresponding path program 1 times [2020-07-21 13:35:57,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:57,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582732488] [2020-07-21 13:35:57,475 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 13:35:57,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:57,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:57,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:57,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:57,536 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 13:35:57,537 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:57,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582732488] [2020-07-21 13:35:57,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:57,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:57,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569005122] [2020-07-21 13:35:57,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:57,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:57,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:57,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,539 INFO L87 Difference]: Start difference. First operand 1016 states and 1334 transitions. Second operand 3 states. [2020-07-21 13:35:57,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:57,579 INFO L93 Difference]: Finished difference Result 1516 states and 1976 transitions. [2020-07-21 13:35:57,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:57,580 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:57,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:57,588 INFO L225 Difference]: With dead ends: 1516 [2020-07-21 13:35:57,588 INFO L226 Difference]: Without dead ends: 1034 [2020-07-21 13:35:57,590 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 13:35:57,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1034 states. [2020-07-21 13:35:57,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1034 to 1032. [2020-07-21 13:35:57,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1032 states. [2020-07-21 13:35:57,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1318 transitions. [2020-07-21 13:35:57,636 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1318 transitions. Word has length 22 [2020-07-21 13:35:57,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:57,636 INFO L479 AbstractCegarLoop]: Abstraction has 1032 states and 1318 transitions. [2020-07-21 13:35:57,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:57,637 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1318 transitions. [2020-07-21 13:35:57,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:57,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:57,640 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:57,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:57,855 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:57,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:57,856 INFO L82 PathProgramCache]: Analyzing trace with hash -366493858, now seen corresponding path program 1 times [2020-07-21 13:35:57,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:57,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139239691] [2020-07-21 13:35:57,857 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 13:35:57,902 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:57,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:57,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:57,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:57,911 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 13:35:57,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:57,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139239691] [2020-07-21 13:35:57,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:57,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:57,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033973458] [2020-07-21 13:35:57,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:57,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:57,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:57,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,913 INFO L87 Difference]: Start difference. First operand 1032 states and 1318 transitions. Second operand 3 states. [2020-07-21 13:35:57,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:57,958 INFO L93 Difference]: Finished difference Result 2316 states and 2920 transitions. [2020-07-21 13:35:57,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:57,958 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:57,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:57,966 INFO L225 Difference]: With dead ends: 2316 [2020-07-21 13:35:57,966 INFO L226 Difference]: Without dead ends: 1322 [2020-07-21 13:35:57,969 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 13:35:57,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1322 states. [2020-07-21 13:35:58,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1322 to 1320. [2020-07-21 13:35:58,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1320 states. [2020-07-21 13:35:58,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1606 transitions. [2020-07-21 13:35:58,024 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1606 transitions. Word has length 22 [2020-07-21 13:35:58,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:58,025 INFO L479 AbstractCegarLoop]: Abstraction has 1320 states and 1606 transitions. [2020-07-21 13:35:58,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:58,025 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1606 transitions. [2020-07-21 13:35:58,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:58,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:58,028 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 13:35:58,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,243 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:58,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:58,244 INFO L82 PathProgramCache]: Analyzing trace with hash 822743769, now seen corresponding path program 1 times [2020-07-21 13:35:58,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:58,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265056047] [2020-07-21 13:35:58,245 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 13:35:58,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:58,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:58,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:58,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:58,298 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 13:35:58,299 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:58,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265056047] [2020-07-21 13:35:58,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:58,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:58,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110608041] [2020-07-21 13:35:58,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:58,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:58,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:58,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,301 INFO L87 Difference]: Start difference. First operand 1320 states and 1606 transitions. Second operand 3 states. [2020-07-21 13:35:58,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:58,373 INFO L93 Difference]: Finished difference Result 2154 states and 2599 transitions. [2020-07-21 13:35:58,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:58,374 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:58,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:58,388 INFO L225 Difference]: With dead ends: 2154 [2020-07-21 13:35:58,388 INFO L226 Difference]: Without dead ends: 2152 [2020-07-21 13:35:58,390 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 13:35:58,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2152 states. [2020-07-21 13:35:58,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2152 to 2024. [2020-07-21 13:35:58,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2024 states. [2020-07-21 13:35:58,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2024 states to 2024 states and 2406 transitions. [2020-07-21 13:35:58,501 INFO L78 Accepts]: Start accepts. Automaton has 2024 states and 2406 transitions. Word has length 23 [2020-07-21 13:35:58,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:58,503 INFO L479 AbstractCegarLoop]: Abstraction has 2024 states and 2406 transitions. [2020-07-21 13:35:58,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:58,504 INFO L276 IsEmpty]: Start isEmpty. Operand 2024 states and 2406 transitions. [2020-07-21 13:35:58,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:58,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:58,510 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 13:35:58,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,725 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:58,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:58,726 INFO L82 PathProgramCache]: Analyzing trace with hash 429716759, now seen corresponding path program 1 times [2020-07-21 13:35:58,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:58,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730217507] [2020-07-21 13:35:58,727 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 13:35:58,769 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:58,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:58,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:58,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:58,779 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 13:35:58,779 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:58,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730217507] [2020-07-21 13:35:58,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:58,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:58,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809174163] [2020-07-21 13:35:58,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:58,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:58,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:58,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,782 INFO L87 Difference]: Start difference. First operand 2024 states and 2406 transitions. Second operand 3 states. [2020-07-21 13:35:58,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:58,834 INFO L93 Difference]: Finished difference Result 3020 states and 3560 transitions. [2020-07-21 13:35:58,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:58,835 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:58,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:58,854 INFO L225 Difference]: With dead ends: 3020 [2020-07-21 13:35:58,855 INFO L226 Difference]: Without dead ends: 2058 [2020-07-21 13:35:58,859 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 13:35:58,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2058 states. [2020-07-21 13:35:58,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2058 to 2056. [2020-07-21 13:35:58,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2056 states. [2020-07-21 13:35:58,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2056 states to 2056 states and 2374 transitions. [2020-07-21 13:35:58,943 INFO L78 Accepts]: Start accepts. Automaton has 2056 states and 2374 transitions. Word has length 23 [2020-07-21 13:35:58,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:58,943 INFO L479 AbstractCegarLoop]: Abstraction has 2056 states and 2374 transitions. [2020-07-21 13:35:58,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:58,943 INFO L276 IsEmpty]: Start isEmpty. Operand 2056 states and 2374 transitions. [2020-07-21 13:35:58,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:58,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:58,948 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 13:35:59,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:59,164 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:59,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:59,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1130781337, now seen corresponding path program 1 times [2020-07-21 13:35:59,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:59,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391080516] [2020-07-21 13:35:59,165 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 13:35:59,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:59,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:59,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:59,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:59,208 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 13:35:59,209 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:59,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391080516] [2020-07-21 13:35:59,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:59,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:59,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693176769] [2020-07-21 13:35:59,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:59,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:59,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:59,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:59,211 INFO L87 Difference]: Start difference. First operand 2056 states and 2374 transitions. Second operand 3 states. [2020-07-21 13:35:59,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:59,286 INFO L93 Difference]: Finished difference Result 4552 states and 5126 transitions. [2020-07-21 13:35:59,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:59,287 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:59,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:59,287 INFO L225 Difference]: With dead ends: 4552 [2020-07-21 13:35:59,287 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:35:59,296 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 13:35:59,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:35:59,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:35:59,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:35:59,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:35:59,297 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-07-21 13:35:59,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:59,298 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:35:59,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:59,298 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:35:59,298 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:35:59,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:59,516 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:35:59,572 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:35:59,572 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:35:59,573 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:35:59,573 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:35:59,573 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:35:59,573 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:35:59,573 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 121) no Hoare annotation was computed. [2020-07-21 13:35:59,573 INFO L268 CegarLoopResult]: For program point L102(line 102) no Hoare annotation was computed. [2020-07-21 13:35:59,573 INFO L268 CegarLoopResult]: For program point L86-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,573 INFO L271 CegarLoopResult]: At program point L111-1(lines 30 116) the Hoare annotation is: true [2020-07-21 13:35:59,574 INFO L268 CegarLoopResult]: For program point L87(line 87) no Hoare annotation was computed. [2020-07-21 13:35:59,574 INFO L268 CegarLoopResult]: For program point L112(line 112) no Hoare annotation was computed. [2020-07-21 13:35:59,574 INFO L264 CegarLoopResult]: At program point L112-1(lines 5 121) the Hoare annotation is: false [2020-07-21 13:35:59,574 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 121) no Hoare annotation was computed. [2020-07-21 13:35:59,574 INFO L268 CegarLoopResult]: For program point L71-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,574 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 119) no Hoare annotation was computed. [2020-07-21 13:35:59,574 INFO L268 CegarLoopResult]: For program point L96-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L63-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 121) the Hoare annotation is: true [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L55-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L97(line 97) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L81-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L106-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L32(lines 32 34) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L82(line 82) no Hoare annotation was computed. [2020-07-21 13:35:59,575 INFO L268 CegarLoopResult]: For program point L107(line 107) no Hoare annotation was computed. [2020-07-21 13:35:59,576 INFO L268 CegarLoopResult]: For program point L91-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,576 INFO L268 CegarLoopResult]: For program point L75-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,576 INFO L268 CegarLoopResult]: For program point L67-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,576 INFO L268 CegarLoopResult]: For program point L92(line 92) no Hoare annotation was computed. [2020-07-21 13:35:59,576 INFO L268 CegarLoopResult]: For program point L59-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,576 INFO L271 CegarLoopResult]: At program point L117(lines 5 121) the Hoare annotation is: true [2020-07-21 13:35:59,576 INFO L268 CegarLoopResult]: For program point L51(lines 51 53) no Hoare annotation was computed. [2020-07-21 13:35:59,576 INFO L268 CegarLoopResult]: For program point L51-2(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,577 INFO L268 CegarLoopResult]: For program point L101-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 13:35:59,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:35:59 BoogieIcfgContainer [2020-07-21 13:35:59,590 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:35:59,593 INFO L168 Benchmark]: Toolchain (without parser) took 8399.24 ms. Allocated memory was 136.3 MB in the beginning and 252.7 MB in the end (delta: 116.4 MB). Free memory was 99.1 MB in the beginning and 136.8 MB in the end (delta: -37.7 MB). Peak memory consumption was 78.7 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:59,593 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 13:35:59,594 INFO L168 Benchmark]: CACSL2BoogieTranslator took 288.95 ms. Allocated memory is still 136.3 MB. Free memory was 98.7 MB in the beginning and 88.4 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:59,595 INFO L168 Benchmark]: Boogie Preprocessor took 144.17 ms. Allocated memory was 136.3 MB in the beginning and 198.7 MB in the end (delta: 62.4 MB). Free memory was 88.4 MB in the beginning and 176.7 MB in the end (delta: -88.3 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:59,595 INFO L168 Benchmark]: RCFGBuilder took 437.49 ms. Allocated memory is still 198.7 MB. Free memory was 176.7 MB in the beginning and 160.5 MB in the end (delta: 16.2 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:59,596 INFO L168 Benchmark]: TraceAbstraction took 7521.15 ms. Allocated memory was 198.7 MB in the beginning and 252.7 MB in the end (delta: 54.0 MB). Free memory was 159.8 MB in the beginning and 136.8 MB in the end (delta: 23.0 MB). Peak memory consumption was 77.0 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:59,599 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 288.95 ms. Allocated memory is still 136.3 MB. Free memory was 98.7 MB in the beginning and 88.4 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 144.17 ms. Allocated memory was 136.3 MB in the beginning and 198.7 MB in the end (delta: 62.4 MB). Free memory was 88.4 MB in the beginning and 176.7 MB in the end (delta: -88.3 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 437.49 ms. Allocated memory is still 198.7 MB. Free memory was 176.7 MB in the beginning and 160.5 MB in the end (delta: 16.2 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7521.15 ms. Allocated memory was 198.7 MB in the beginning and 252.7 MB in the end (delta: 54.0 MB). Free memory was 159.8 MB in the beginning and 136.8 MB in the end (delta: 23.0 MB). Peak memory consumption was 77.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 119]: 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: 30]: 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, 35 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 7.3s, OverallIterations: 20, TraceHistogramMax: 1, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1238 SDtfs, 574 SDslu, 829 SDs, 0 SdLazy, 107 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 383 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2056occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 20 MinimizatonAttempts, 530 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 138 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 403 NumberOfCodeBlocks, 352 NumberOfCodeBlocksAsserted, 35 NumberOfCheckSat, 383 ConstructedInterpolants, 0 QuantifiedInterpolants, 13856 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1584 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 20 InterpolantComputations, 20 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...