/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:22:27,115 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:22:27,118 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:22:27,136 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:22:27,137 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:22:27,139 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:22:27,141 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:22:27,154 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:22:27,157 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:22:27,159 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:22:27,160 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:22:27,162 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:22:27,162 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:22:27,163 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:22:27,168 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:22:27,169 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:22:27,172 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:22:27,172 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:22:27,174 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:22:27,178 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:22:27,183 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:22:27,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:22:27,189 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:22:27,190 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:22:27,195 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:22:27,211 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:22:27,212 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:22:27,214 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:22:27,214 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:22:27,243 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:22:27,243 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:22:27,245 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:22:27,246 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:22:27,246 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:22:27,246 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:22:27,246 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:22:27,247 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:22:27,247 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:22:27,247 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:22:27,248 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:22:27,248 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:22:27,249 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:22:27,249 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:22:27,249 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:22:27,250 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:22:27,250 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:22:27,250 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:22:27,250 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:22:27,250 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:22:27,251 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:22:27,251 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:27,251 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:22:27,251 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:22:27,252 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:22:27,252 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:22:27,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:27,252 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:22:27,252 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:22:27,253 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:22:27,574 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:22:27,589 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:22:27,592 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:22:27,594 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:22:27,594 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:22:27,595 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-20 21:22:27,663 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a371ce60/de5c951e89c24740b3d14d6a4c382c7c/FLAGe58e0d932 [2020-07-20 21:22:28,134 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:22:28,135 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-20 21:22:28,142 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a371ce60/de5c951e89c24740b3d14d6a4c382c7c/FLAGe58e0d932 [2020-07-20 21:22:28,493 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a371ce60/de5c951e89c24740b3d14d6a4c382c7c [2020-07-20 21:22:28,502 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:22:28,505 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:22:28,506 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:28,506 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:22:28,510 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:22:28,512 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,515 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@554e2b63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28, skipping insertion in model container [2020-07-20 21:22:28,515 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,522 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:22:28,538 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:22:28,722 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:28,728 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:22:28,746 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:28,762 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:22:28,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28 WrapperNode [2020-07-20 21:22:28,763 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:28,764 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:22:28,764 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:22:28,764 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:22:28,779 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,780 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,785 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,785 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,789 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,791 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,792 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... [2020-07-20 21:22:28,794 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:22:28,794 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:22:28,795 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:22:28,795 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:22:28,796 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:28,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:22:28,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:22:28,949 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 21:22:28,949 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:22:28,949 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:22:28,949 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:22:28,950 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 21:22:28,950 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:22:28,950 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:22:28,950 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:22:29,130 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:22:29,130 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:22:29,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:29 BoogieIcfgContainer [2020-07-20 21:22:29,135 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:22:29,137 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:22:29,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:22:29,140 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:22:29,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:22:28" (1/3) ... [2020-07-20 21:22:29,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a741198 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:29, skipping insertion in model container [2020-07-20 21:22:29,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:28" (2/3) ... [2020-07-20 21:22:29,142 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a741198 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:29, skipping insertion in model container [2020-07-20 21:22:29,142 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:29" (3/3) ... [2020-07-20 21:22:29,144 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-1.c [2020-07-20 21:22:29,155 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:22:29,163 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:22:29,179 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:22:29,247 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:22:29,248 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:22:29,248 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:22:29,248 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:22:29,248 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:22:29,249 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:22:29,249 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:22:29,249 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:22:29,297 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 21:22:29,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:22:29,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:29,305 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:29,306 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:29,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:29,317 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 21:22:29,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:29,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400256395] [2020-07-20 21:22:29,328 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:29,394 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:29,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:29,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:29,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:29,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:29,501 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:29,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400256395] [2020-07-20 21:22:29,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:29,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:29,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189654211] [2020-07-20 21:22:29,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:29,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:29,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:29,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:29,528 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 21:22:29,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:29,641 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 21:22:29,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:29,644 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:22:29,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:29,655 INFO L225 Difference]: With dead ends: 35 [2020-07-20 21:22:29,656 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:22:29,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:22:29,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:22:29,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:22:29,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:29,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:29,711 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 21:22:29,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:29,712 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:29,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:29,712 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:29,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:22:29,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:29,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:29,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:29,928 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:29,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:29,929 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 21:22:29,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:29,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373352716] [2020-07-20 21:22:29,931 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:29,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:29,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:29,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:29,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:29,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:29,987 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:29,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373352716] [2020-07-20 21:22:29,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:29,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:29,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321515638] [2020-07-20 21:22:29,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:29,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:29,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:29,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:29,992 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 21:22:30,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:30,074 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 21:22:30,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:30,075 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:22:30,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:30,077 INFO L225 Difference]: With dead ends: 27 [2020-07-20 21:22:30,077 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 21:22:30,078 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:22:30,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 21:22:30,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 21:22:30,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:30,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:30,087 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 21:22:30,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:30,087 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:30,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:30,088 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:30,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:22:30,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:30,089 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:30,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:30,304 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:30,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:30,306 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 21:22:30,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:30,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877608576] [2020-07-20 21:22:30,308 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:30,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:30,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:30,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:30,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:30,393 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:30,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:30,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:30,610 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:30,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877608576] [2020-07-20 21:22:30,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:30,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:30,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634306256] [2020-07-20 21:22:30,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:30,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:30,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:30,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:30,614 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 21:22:30,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:30,721 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 21:22:30,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:30,721 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 21:22:30,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:30,723 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:22:30,723 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 21:22:30,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:30,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 21:22:30,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 21:22:30,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:30,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:30,733 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 21:22:30,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:30,734 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:30,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:30,734 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:30,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:22:30,736 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:30,736 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:30,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:30,949 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:30,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:30,950 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 21:22:30,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:30,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772220143] [2020-07-20 21:22:30,952 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:30,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:30,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:30,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:30,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:31,031 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:22:31,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:31,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:31,210 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:31,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772220143] [2020-07-20 21:22:31,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:31,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:31,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060642701] [2020-07-20 21:22:31,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:31,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:31,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:31,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:31,213 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 21:22:31,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:31,293 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 21:22:31,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:31,294 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 21:22:31,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:31,296 INFO L225 Difference]: With dead ends: 37 [2020-07-20 21:22:31,297 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:22:31,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:31,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:22:31,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 21:22:31,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:31,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:31,307 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 21:22:31,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:31,307 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:31,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:31,308 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:31,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:22:31,309 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:31,310 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:31,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:31,523 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:31,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:31,523 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 21:22:31,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:31,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104172364] [2020-07-20 21:22:31,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:31,559 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:31,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:31,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:31,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:31,605 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 21:22:31,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:31,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:31,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:31,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:31,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:31,956 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:31,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104172364] [2020-07-20 21:22:31,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:31,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:31,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892394041] [2020-07-20 21:22:31,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:31,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:31,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:31,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:31,959 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 21:22:32,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:32,135 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 21:22:32,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:32,136 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 21:22:32,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:32,138 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:22:32,138 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 21:22:32,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:32,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 21:22:32,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 21:22:32,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:32,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:32,149 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 21:22:32,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:32,150 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:32,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:32,150 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:32,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:22:32,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:32,152 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:32,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:32,360 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:32,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:32,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 21:22:32,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:32,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111120763] [2020-07-20 21:22:32,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:32,408 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:32,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:32,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:32,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:32,466 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 21:22:32,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:32,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:32,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:32,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:32,801 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:32,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111120763] [2020-07-20 21:22:32,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:32,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:32,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562195747] [2020-07-20 21:22:32,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:32,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:32,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:32,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:32,804 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 21:22:32,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:32,949 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 21:22:32,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:32,950 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:22:32,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:32,959 INFO L225 Difference]: With dead ends: 47 [2020-07-20 21:22:32,959 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 21:22:32,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:32,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 21:22:32,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 21:22:32,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:32,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:32,984 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 21:22:32,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:32,984 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:32,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:32,985 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:32,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 21:22:32,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:32,989 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:33,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:33,204 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:33,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:33,205 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 21:22:33,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:33,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465995849] [2020-07-20 21:22:33,206 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:33,246 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:33,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:33,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:33,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:33,300 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 21:22:33,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:33,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,951 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:22:33,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465995849] [2020-07-20 21:22:33,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:33,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:33,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818910360] [2020-07-20 21:22:33,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:33,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:33,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:33,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:33,954 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 21:22:34,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:34,131 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 21:22:34,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:34,132 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 21:22:34,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:34,135 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:22:34,135 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:22:34,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:34,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:22:34,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 21:22:34,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:34,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:34,147 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 21:22:34,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:34,148 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:34,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:34,148 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:34,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 21:22:34,151 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:34,151 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:34,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:34,355 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:34,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:34,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 21:22:34,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:34,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [345698471] [2020-07-20 21:22:34,357 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:34,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:34,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:34,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:34,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:34,500 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 21:22:34,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:34,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:35,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:35,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:35,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:35,146 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 21:22:35,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [345698471] [2020-07-20 21:22:35,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:35,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:35,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926513872] [2020-07-20 21:22:35,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:35,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:35,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:35,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:35,150 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 21:22:35,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:35,300 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 21:22:35,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:35,303 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 21:22:35,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:35,306 INFO L225 Difference]: With dead ends: 57 [2020-07-20 21:22:35,306 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 21:22:35,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:35,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 21:22:35,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 21:22:35,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:35,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:35,322 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 21:22:35,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:35,323 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:35,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:35,323 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:35,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 21:22:35,325 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:35,326 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:35,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:35,539 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:35,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:35,540 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 21:22:35,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:35,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89884037] [2020-07-20 21:22:35,542 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:35,618 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:35,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:35,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:35,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:35,700 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 21:22:35,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:36,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:36,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:36,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:36,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:36,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:36,652 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:22:36,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89884037] [2020-07-20 21:22:36,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:36,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:36,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901412451] [2020-07-20 21:22:36,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:36,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:36,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:36,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:36,655 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 21:22:36,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:36,952 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 21:22:36,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:36,952 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 21:22:36,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:36,956 INFO L225 Difference]: With dead ends: 62 [2020-07-20 21:22:36,956 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 21:22:36,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:36,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 21:22:36,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 21:22:36,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:36,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:36,970 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 21:22:36,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:36,971 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:36,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:36,971 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:36,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:22:36,975 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:36,975 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:37,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:37,189 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:37,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:37,190 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 21:22:37,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:37,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727028840] [2020-07-20 21:22:37,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:37,273 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:37,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:37,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:37,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:37,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 21:22:37,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:38,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:38,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:38,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:38,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:38,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:38,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:38,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 21:22:38,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727028840] [2020-07-20 21:22:38,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:38,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:38,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094600087] [2020-07-20 21:22:38,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:38,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:38,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:38,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:38,486 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 21:22:38,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:38,660 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 21:22:38,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:38,660 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 21:22:38,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:38,664 INFO L225 Difference]: With dead ends: 67 [2020-07-20 21:22:38,665 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 21:22:38,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:38,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 21:22:38,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 21:22:38,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:38,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:38,696 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 21:22:38,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:38,699 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:38,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:38,700 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:38,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 21:22:38,707 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:38,708 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:38,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:38,924 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:38,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:38,924 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 21:22:38,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:38,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743054918] [2020-07-20 21:22:38,925 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:39,040 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:39,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:39,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:39,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:39,173 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 21:22:39,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:40,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:40,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:40,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:40,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:40,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:40,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:41,081 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 21:22:41,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743054918] [2020-07-20 21:22:41,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:41,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:41,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723994762] [2020-07-20 21:22:41,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:41,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:41,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:41,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:41,087 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 21:22:41,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:41,296 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 21:22:41,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:41,297 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 21:22:41,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:41,300 INFO L225 Difference]: With dead ends: 72 [2020-07-20 21:22:41,300 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 21:22:41,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:22:41,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 21:22:41,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 21:22:41,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:22:41,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:22:41,314 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 21:22:41,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:41,315 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:22:41,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:22:41,315 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:22:41,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 21:22:41,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:41,320 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:41,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:41,534 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:41,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:41,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 21:22:41,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:41,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522933177] [2020-07-20 21:22:41,535 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:41,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:41,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:41,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:41,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:41,817 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 21:22:41,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:43,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,753 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 21:22:43,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522933177] [2020-07-20 21:22:43,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:43,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:43,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959790055] [2020-07-20 21:22:43,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:43,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:43,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:43,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:43,756 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 21:22:43,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:43,966 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 21:22:43,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:43,967 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 21:22:43,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:43,970 INFO L225 Difference]: With dead ends: 77 [2020-07-20 21:22:43,970 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 21:22:43,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:22:43,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 21:22:43,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 21:22:43,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:22:43,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:22:43,983 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 21:22:43,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:43,984 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:22:43,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:22:43,984 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:22:43,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 21:22:43,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:43,997 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:44,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:44,211 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:44,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:44,211 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 21:22:44,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:44,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [850903069] [2020-07-20 21:22:44,212 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:44,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:44,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:44,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:22:44,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:44,647 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 21:22:44,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:46,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,983 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 21:22:47,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [850903069] [2020-07-20 21:22:47,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:47,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:22:47,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637741074] [2020-07-20 21:22:47,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:22:47,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:22:47,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:22:47,986 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 21:22:48,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:48,481 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 21:22:48,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:22:48,482 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 21:22:48,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:48,503 INFO L225 Difference]: With dead ends: 82 [2020-07-20 21:22:48,503 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 21:22:48,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:22:48,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 21:22:48,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 21:22:48,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:22:48,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:22:48,525 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 21:22:48,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:48,527 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:22:48,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:22:48,527 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:22:48,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 21:22:48,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:48,531 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:48,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,745 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 21:22:48,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444660138] [2020-07-20 21:22:48,747 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:48,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 845 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:49,150 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 21:22:49,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:50,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,139 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 21:22:52,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444660138] [2020-07-20 21:22:52,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:52,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:22:52,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793405851] [2020-07-20 21:22:52,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:22:52,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:52,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:22:52,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:22:52,142 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 21:22:52,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:52,404 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 21:22:52,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:22:52,405 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 21:22:52,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:52,408 INFO L225 Difference]: With dead ends: 87 [2020-07-20 21:22:52,408 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 21:22:52,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:22:52,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 21:22:52,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 21:22:52,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:22:52,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:22:52,423 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 21:22:52,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:52,424 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:22:52,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:22:52,424 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:22:52,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 21:22:52,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:52,436 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:52,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:52,651 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:52,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:52,651 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 21:22:52,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:52,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376511910] [2020-07-20 21:22:52,652 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,083 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:53,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:53,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 2014 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:22:53,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:53,639 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 21:22:53,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:57,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:58,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,245 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 21:23:00,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376511910] [2020-07-20 21:23:00,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:00,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:00,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753120692] [2020-07-20 21:23:00,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:00,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:00,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:00,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:00,250 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 21:23:00,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:00,870 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 21:23:00,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:00,871 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 21:23:00,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:00,877 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:23:00,877 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:23:00,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:23:00,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:23:00,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 21:23:00,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:00,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:00,891 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 21:23:00,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:00,893 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:00,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:00,893 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:00,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 651 [2020-07-20 21:23:00,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:00,898 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 73, 47, 47, 47, 47, 47, 47, 47, 26, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:01,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:01,114 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:01,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:01,115 INFO L82 PathProgramCache]: Analyzing trace with hash -12450132, now seen corresponding path program 7 times [2020-07-20 21:23:01,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:01,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283104911] [2020-07-20 21:23:01,116 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:01,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:01,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:01,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 1220 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:01,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:01,683 INFO L134 CoverageAnalysis]: Checked inductivity of 24812 backedges. 501 proven. 3346 refuted. 0 times theorem prover too weak. 20965 trivial. 0 not checked. [2020-07-20 21:23:01,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:04,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:06,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:06,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:06,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:06,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:06,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:06,706 INFO L134 CoverageAnalysis]: Checked inductivity of 24812 backedges. 501 proven. 3423 refuted. 0 times theorem prover too weak. 20888 trivial. 0 not checked. [2020-07-20 21:23:06,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283104911] [2020-07-20 21:23:06,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:06,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:06,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783741331] [2020-07-20 21:23:06,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:06,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:06,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:06,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:06,721 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 21:23:07,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:07,151 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 21:23:07,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:07,152 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 650 [2020-07-20 21:23:07,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:07,156 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:23:07,156 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 21:23:07,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1307 GetRequests, 1264 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:23:07,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 21:23:07,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 21:23:07,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:07,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:07,175 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 650 [2020-07-20 21:23:07,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:07,176 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:07,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:07,177 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:07,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1496 [2020-07-20 21:23:07,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:07,197 INFO L422 BasicCegarLoop]: trace histogram [229, 229, 115, 114, 114, 114, 114, 114, 114, 114, 114, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:07,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:07,411 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:07,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:07,411 INFO L82 PathProgramCache]: Analyzing trace with hash -1187543541, now seen corresponding path program 8 times [2020-07-20 21:23:07,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:07,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497675343] [2020-07-20 21:23:07,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:07,948 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:07,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:07,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 2821 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:07,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:08,869 INFO L134 CoverageAnalysis]: Checked inductivity of 136629 backedges. 1386 proven. 8950 refuted. 0 times theorem prover too weak. 126293 trivial. 0 not checked. [2020-07-20 21:23:08,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:13,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:16,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:16,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:19,128 INFO L134 CoverageAnalysis]: Checked inductivity of 136629 backedges. 1386 proven. 9042 refuted. 0 times theorem prover too weak. 126201 trivial. 0 not checked. [2020-07-20 21:23:19,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497675343] [2020-07-20 21:23:19,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:19,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:19,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082649983] [2020-07-20 21:23:19,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:19,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:19,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:19,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:19,133 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 21:23:19,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:19,673 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 21:23:19,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:19,674 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1495 [2020-07-20 21:23:19,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:19,680 INFO L225 Difference]: With dead ends: 102 [2020-07-20 21:23:19,680 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 21:23:19,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2999 GetRequests, 2951 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:19,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 21:23:19,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 21:23:19,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:19,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:19,698 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1495 [2020-07-20 21:23:19,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:19,701 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:19,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:19,701 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:19,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-20 21:23:19,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:19,733 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:19,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:19,948 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:19,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:19,949 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-20 21:23:19,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:19,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240395881] [2020-07-20 21:23:19,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:20,609 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:20,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:20,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 3443 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:20,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:21,956 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-20 21:23:21,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:27,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:30,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:30,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:31,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:31,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,106 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-20 21:23:34,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240395881] [2020-07-20 21:23:34,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:34,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:34,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579151830] [2020-07-20 21:23:34,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:34,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:34,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:34,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:34,110 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 21:23:34,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:34,625 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 21:23:34,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:34,626 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-20 21:23:34,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:34,633 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:23:34,633 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 21:23:34,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:34,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 21:23:34,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 21:23:34,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:34,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:34,650 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-20 21:23:34,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:34,652 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:34,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:34,652 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:34,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2614 [2020-07-20 21:23:34,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:34,700 INFO L422 BasicCegarLoop]: trace histogram [401, 401, 201, 200, 200, 200, 200, 200, 200, 200, 200, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:34,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:34,909 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:34,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:34,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1810006087, now seen corresponding path program 9 times [2020-07-20 21:23:34,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:34,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156130393] [2020-07-20 21:23:34,912 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:35,815 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:35,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:35,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 4931 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:23:35,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:38,995 INFO L134 CoverageAnalysis]: Checked inductivity of 420300 backedges. 2669 proven. 17854 refuted. 0 times theorem prover too weak. 399777 trivial. 0 not checked. [2020-07-20 21:23:38,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:46,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:51,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:53,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:54,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:54,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:55,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:55,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:55,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:55,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:56,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:56,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:56,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:58,547 INFO L134 CoverageAnalysis]: Checked inductivity of 420300 backedges. 2669 proven. 17971 refuted. 0 times theorem prover too weak. 399660 trivial. 0 not checked. [2020-07-20 21:23:58,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156130393] [2020-07-20 21:23:58,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:58,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:23:58,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142236466] [2020-07-20 21:23:58,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:23:58,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:58,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:23:58,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:23:58,552 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 21:23:59,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:59,291 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 21:23:59,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:59,298 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2613 [2020-07-20 21:23:59,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:59,305 INFO L225 Difference]: With dead ends: 112 [2020-07-20 21:23:59,305 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 21:23:59,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5236 GetRequests, 5183 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:23:59,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 21:23:59,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 21:23:59,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:23:59,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:23:59,323 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2613 [2020-07-20 21:23:59,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:59,325 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:23:59,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:23:59,325 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:23:59,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3553 [2020-07-20 21:23:59,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:59,433 INFO L422 BasicCegarLoop]: trace histogram [517, 517, 443, 258, 258, 258, 258, 258, 258, 258, 185, 74, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:59,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:59,634 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:59,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:59,636 INFO L82 PathProgramCache]: Analyzing trace with hash -2087937559, now seen corresponding path program 9 times [2020-07-20 21:23:59,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:59,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410981001] [2020-07-20 21:23:59,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:00,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:00,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:00,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 6625 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:00,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:04,957 INFO L134 CoverageAnalysis]: Checked inductivity of 764059 backedges. 3120 proven. 25582 refuted. 0 times theorem prover too weak. 735357 trivial. 0 not checked. [2020-07-20 21:24:04,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:17,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:22,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:24,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:24,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:26,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:26,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:31,612 INFO L134 CoverageAnalysis]: Checked inductivity of 764059 backedges. 3120 proven. 25708 refuted. 0 times theorem prover too weak. 735231 trivial. 0 not checked. [2020-07-20 21:24:31,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410981001] [2020-07-20 21:24:31,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:31,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:24:31,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144077684] [2020-07-20 21:24:31,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:31,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:31,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:31,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:31,616 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 21:24:32,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:32,382 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 21:24:32,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:32,383 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3552 [2020-07-20 21:24:32,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:32,390 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:24:32,391 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 21:24:32,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7113 GetRequests, 7060 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:32,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 21:24:32,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 21:24:32,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:24:32,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:24:32,410 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3552 [2020-07-20 21:24:32,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:32,413 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:24:32,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:32,413 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:24:32,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-20 21:24:32,518 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:32,519 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:32,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:32,721 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:32,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:32,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1045213854, now seen corresponding path program 10 times [2020-07-20 21:24:32,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:32,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762995183] [2020-07-20 21:24:32,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:34,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:34,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:34,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 7502 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:24:34,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:39,229 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4203 proven. 30592 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-20 21:24:39,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:52,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:52,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:00,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:04,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:06,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:07,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:08,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:08,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:08,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:09,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:09,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:09,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:15,269 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4203 proven. 30737 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-20 21:25:15,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762995183] [2020-07-20 21:25:15,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:15,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:25:15,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927712425] [2020-07-20 21:25:15,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:25:15,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:15,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:25:15,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:25:15,275 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 21:25:16,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:16,777 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 21:25:16,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:25:16,778 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-20 21:25:16,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:16,788 INFO L225 Difference]: With dead ends: 122 [2020-07-20 21:25:16,788 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 21:25:16,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:25:16,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 21:25:16,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 21:25:16,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:25:16,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:25:16,815 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-20 21:25:16,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:16,818 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:25:16,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:25:16,819 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:25:17,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6755 [2020-07-20 21:25:17,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:17,097 INFO L422 BasicCegarLoop]: trace histogram [989, 989, 813, 494, 494, 494, 494, 494, 494, 494, 319, 176, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:17,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:17,298 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:17,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:17,301 INFO L82 PathProgramCache]: Analyzing trace with hash -2021059453, now seen corresponding path program 10 times [2020-07-20 21:25:17,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:17,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499092757] [2020-07-20 21:25:17,303 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:19,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:19,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:19,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 12611 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:25:19,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:34,773 INFO L134 CoverageAnalysis]: Checked inductivity of 2771426 backedges. 6072 proven. 54629 refuted. 0 times theorem prover too weak. 2710725 trivial. 0 not checked. [2020-07-20 21:25:34,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:03,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:15,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:15,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,449 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:26:21,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:23,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:23,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:25,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:25,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:26,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:26,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:27,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:27,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:27,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:27,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:27,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:27,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:42,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2771426 backedges. 6072 proven. 54784 refuted. 0 times theorem prover too weak. 2710570 trivial. 0 not checked. [2020-07-20 21:26:42,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499092757] [2020-07-20 21:26:42,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:42,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:26:42,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128240866] [2020-07-20 21:26:42,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:26:42,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:42,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:26:42,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:26:42,641 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 21:26:43,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:43,449 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 21:26:43,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:26:43,452 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 6754 [2020-07-20 21:26:43,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:43,461 INFO L225 Difference]: With dead ends: 127 [2020-07-20 21:26:43,461 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 21:26:43,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13518 GetRequests, 13460 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:26:43,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 21:26:43,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 21:26:43,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:26:43,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:26:43,483 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 6754 [2020-07-20 21:26:43,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:43,488 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:26:43,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:26:43,488 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:26:43,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7476 [2020-07-20 21:26:43,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:43,770 INFO L422 BasicCegarLoop]: trace histogram [1149, 1149, 575, 574, 574, 574, 574, 574, 574, 574, 574, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:43,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:43,971 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:43,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:43,975 INFO L82 PathProgramCache]: Analyzing trace with hash 560950141, now seen corresponding path program 11 times [2020-07-20 21:26:43,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:43,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18178927] [2020-07-20 21:26:43,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:46,445 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:46,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:46,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 14091 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:26:46,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:27:05,196 INFO L134 CoverageAnalysis]: Checked inductivity of 3460359 backedges. 8505 proven. 63689 refuted. 0 times theorem prover too weak. 3388165 trivial. 0 not checked. [2020-07-20 21:27:05,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:27:40,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:54,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,764 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:28:11,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:11,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:14,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:16,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:16,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:17,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:17,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:17,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:18,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:18,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:18,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:18,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:39,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3460359 backedges. 8505 proven. 63865 refuted. 0 times theorem prover too weak. 3387989 trivial. 0 not checked. [2020-07-20 21:28:39,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18178927] [2020-07-20 21:28:39,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:28:39,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:28:39,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136455690] [2020-07-20 21:28:39,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:28:39,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:28:39,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:28:39,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:28:39,097 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 21:28:39,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:28:39,938 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 21:28:39,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:28:39,939 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7475 [2020-07-20 21:28:39,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:28:39,949 INFO L225 Difference]: With dead ends: 132 [2020-07-20 21:28:39,949 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 21:28:39,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14962 GetRequests, 14899 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:28:39,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 21:28:39,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 21:28:39,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:28:39,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:28:39,975 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7475 [2020-07-20 21:28:39,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:28:39,980 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:28:39,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:28:39,981 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:28:40,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11508 [2020-07-20 21:28:40,746 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:28:40,750 INFO L422 BasicCegarLoop]: trace histogram [1675, 1675, 1450, 837, 837, 837, 837, 837, 837, 837, 613, 225, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:28:40,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:40,951 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:28:40,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:28:40,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1531112570, now seen corresponding path program 11 times [2020-07-20 21:28:40,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:28:40,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177585815] [2020-07-20 21:28:40,955 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:44,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:28:44,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:28:44,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 21454 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:28:45,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:29:33,929 INFO L134 CoverageAnalysis]: Checked inductivity of 8057889 backedges. 10534 proven. 103231 refuted. 0 times theorem prover too weak. 7944124 trivial. 0 not checked. [2020-07-20 21:29:33,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:29:48,617 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:29:48,720 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:29:48,832 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 21:29:48,940 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 21:29:49,047 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 21:29:49,151 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 21:29:49,372 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 21:29:49,477 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 21:30:56,188 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:30:56,302 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:30:56,423 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 21:30:56,532 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 21:30:56,637 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 21:30:57,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:57,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:33,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:54,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:54,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:04,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:04,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:07,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:07,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:09,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:09,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:10,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:11,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:11,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:11,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:11,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:11,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:11,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:11,448 INFO L134 CoverageAnalysis]: Checked inductivity of 8057889 backedges. 10534 proven. 103418 refuted. 0 times theorem prover too weak. 7943937 trivial. 0 not checked. [2020-07-20 21:33:11,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177585815] [2020-07-20 21:33:11,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:33:11,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:33:11,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464764995] [2020-07-20 21:33:11,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:33:11,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:33:11,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:33:11,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:33:11,458 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 21:33:13,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:33:13,069 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 21:33:13,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:33:13,071 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 11507 [2020-07-20 21:33:13,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:33:13,086 INFO L225 Difference]: With dead ends: 137 [2020-07-20 21:33:13,086 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 21:33:13,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23025 GetRequests, 22962 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:33:13,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 21:33:13,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 21:33:13,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:33:13,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:33:13,116 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11507 [2020-07-20 21:33:13,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:33:13,123 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:33:13,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:33:13,123 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:33:14,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9777 [2020-07-20 21:33:14,284 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:33:14,291 INFO L422 BasicCegarLoop]: trace histogram [1503, 1503, 752, 751, 751, 751, 751, 751, 751, 751, 751, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:33:14,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:33:14,505 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:33:14,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:33:14,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1385022930, now seen corresponding path program 12 times [2020-07-20 21:33:14,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:33:14,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641523640] [2020-07-20 21:33:14,518 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:33:18,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:33:18,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:33:18,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 18426 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 21:33:18,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:34:02,331 INFO L134 CoverageAnalysis]: Checked inductivity of 5923137 backedges. 11040 proven. 91764 refuted. 0 times theorem prover too weak. 5820333 trivial. 0 not checked. [2020-07-20 21:34:02,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:34:10,540 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:34:14,143 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:34:14,251 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:34:14,366 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:34:14,480 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:34:14,593 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 21:34:14,698 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 21:34:14,800 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 21:35:01,281 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:35:01,385 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:35:02,469 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:35:02,574 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:35:02,687 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:35:06,065 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:35:06,194 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:35:06,329 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:35:06,460 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:35:11,383 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:35:11,527 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:35:11,675 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:35:11,822 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:35:11,959 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 21:35:12,090 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 21:35:12,216 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 21:35:12,334 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 21:35:12,448 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 21:35:12,554 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 21:35:12,658 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 21:35:13,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts