/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:05:51,605 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:05:51,609 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:05:51,628 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:05:51,629 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:05:51,631 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:05:51,633 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:05:51,636 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:05:51,638 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:05:51,639 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:05:51,641 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:05:51,642 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:05:51,643 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:05:51,644 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:05:51,646 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:05:51,647 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:05:51,648 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:05:51,650 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:05:51,652 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:05:51,655 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:05:51,657 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:05:51,658 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:05:51,660 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:05:51,661 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:05:51,664 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:05:51,675 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:05:51,676 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:05:51,677 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:05:51,678 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:05:51,696 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:05:51,696 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:05:51,698 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:05:51,699 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:05:51,699 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:05:51,699 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:05:51,699 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:05:51,699 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:05:51,700 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:05:51,700 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:05:51,700 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:05:51,700 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:05:51,700 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:05:51,701 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:05:51,701 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:05:51,701 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:05:51,701 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:05:51,702 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:05:51,702 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:05:51,702 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:05:51,702 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:05:51,702 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:05:51,703 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:05:51,703 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:05:51,703 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:05:51,703 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:05:51,704 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:51,704 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:05:51,704 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:05:51,704 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:05:52,053 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:05:52,070 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:05:52,076 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:05:52,078 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:05:52,079 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:05:52,080 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-21 22:05:52,164 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec7218afd/e13bdd66a4e147b285c80ac98456185a/FLAG46124622e [2020-07-21 22:05:52,762 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:05:52,763 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-21 22:05:52,775 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec7218afd/e13bdd66a4e147b285c80ac98456185a/FLAG46124622e [2020-07-21 22:05:53,055 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec7218afd/e13bdd66a4e147b285c80ac98456185a [2020-07-21 22:05:53,069 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:05:53,073 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:05:53,077 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:05:53,077 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:05:53,082 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:05:53,084 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,088 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1359affd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53, skipping insertion in model container [2020-07-21 22:05:53,088 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,100 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:05:53,121 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:05:53,372 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:05:53,382 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:05:53,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:05:53,421 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:05:53,422 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53 WrapperNode [2020-07-21 22:05:53,422 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:05:53,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:05:53,423 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:05:53,423 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:05:53,436 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,442 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,443 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,446 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,449 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,450 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... [2020-07-21 22:05:53,452 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:05:53,452 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:05:53,453 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:05:53,453 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:05:53,454 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:05:53,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:05:53,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:05:53,629 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 22:05:53,629 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:05:53,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:05:53,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:05:53,630 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 22:05:53,630 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:05:53,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:05:53,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:05:53,845 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:05:53,845 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:05:53,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:05:53 BoogieIcfgContainer [2020-07-21 22:05:53,851 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:05:53,853 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:05:53,853 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:05:53,857 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:05:53,857 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:05:53" (1/3) ... [2020-07-21 22:05:53,858 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33e707c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:05:53, skipping insertion in model container [2020-07-21 22:05:53,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:05:53" (2/3) ... [2020-07-21 22:05:53,859 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33e707c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:05:53, skipping insertion in model container [2020-07-21 22:05:53,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:05:53" (3/3) ... [2020-07-21 22:05:53,862 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-2.c [2020-07-21 22:05:53,875 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:05:53,886 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:05:53,910 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:05:53,981 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:05:53,981 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:05:53,981 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:05:53,982 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:05:53,982 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:05:53,982 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:05:53,983 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:05:53,983 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:05:54,011 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:05:54,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:05:54,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:54,023 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:05:54,023 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:54,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:54,032 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 22:05:54,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:54,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039705632] [2020-07-21 22:05:54,045 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:54,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:54,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:54,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:05:54,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:54,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:05:54,235 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:05:54,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039705632] [2020-07-21 22:05:54,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:05:54,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:05:54,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332564954] [2020-07-21 22:05:54,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:05:54,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:54,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:05:54,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:05:54,262 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 22:05:54,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:54,379 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:05:54,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:05:54,382 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:05:54,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:54,395 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:05:54,396 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:05:54,401 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 [2020-07-21 22:05:54,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:05:54,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:05:54,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:05:54,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:05:54,463 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:05:54,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:54,464 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:05:54,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:05:54,465 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:05:54,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:05:54,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:54,467 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:05:54,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:54,683 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:54,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:54,684 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 22:05:54,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:54,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810640923] [2020-07-21 22:05:54,686 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:54,723 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:05:54,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:54,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:05:54,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:54,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:05:54,761 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:05:54,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810640923] [2020-07-21 22:05:54,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:05:54,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:05:54,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619904028] [2020-07-21 22:05:54,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:05:54,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:54,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:05:54,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:05:54,767 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:05:54,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:54,838 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:05:54,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:05:54,840 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:05:54,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:54,842 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:05:54,842 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:05:54,843 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 [2020-07-21 22:05:54,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:05:54,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:05:54,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:05:54,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:05:54,853 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:05:54,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:54,854 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:05:54,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:05:54,854 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:05:54,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:05:54,856 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:54,857 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] [2020-07-21 22:05:55,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:55,071 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:55,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:55,072 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 22:05:55,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:55,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607177112] [2020-07-21 22:05:55,073 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:55,106 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:55,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:55,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:05:55,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:55,192 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:05:55,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:55,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:55,445 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:05:55,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607177112] [2020-07-21 22:05:55,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:05:55,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:05:55,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285162133] [2020-07-21 22:05:55,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:05:55,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:55,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:05:55,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:05:55,450 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 22:05:55,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:55,586 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 22:05:55,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:05:55,587 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:05:55,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:55,589 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:05:55,589 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:05:55,590 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 [2020-07-21 22:05:55,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:05:55,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 22:05:55,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:05:55,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:05:55,602 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 22:05:55,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:55,603 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:05:55,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:05:55,604 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:05:55,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:05:55,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:55,606 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] [2020-07-21 22:05:55,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:55,820 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:55,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:55,821 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 22:05:55,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:55,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899114769] [2020-07-21 22:05:55,821 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:55,851 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:55,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:55,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:05:55,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:55,898 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:05:55,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:56,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:56,077 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:05:56,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899114769] [2020-07-21 22:05:56,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:05:56,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:05:56,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897930955] [2020-07-21 22:05:56,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:05:56,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:56,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:05:56,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:05:56,080 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 22:05:56,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:56,169 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 22:05:56,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:05:56,170 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:05:56,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:56,173 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:05:56,173 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:05:56,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:05:56,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:05:56,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 22:05:56,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:05:56,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:05:56,185 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 22:05:56,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:56,185 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:05:56,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:05:56,186 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:05:56,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:05:56,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:56,188 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] [2020-07-21 22:05:56,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:56,404 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:56,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:56,405 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 22:05:56,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:56,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589326542] [2020-07-21 22:05:56,407 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:56,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:56,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:56,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:05:56,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:56,507 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 22:05:56,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:56,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:56,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:56,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:56,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:56,868 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:05:56,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589326542] [2020-07-21 22:05:56,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:05:56,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:05:56,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094457865] [2020-07-21 22:05:56,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:05:56,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:56,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:05:56,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:05:56,872 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 22:05:57,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:57,042 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 22:05:57,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:05:57,043 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 22:05:57,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:57,046 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:05:57,046 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:05:57,047 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 [2020-07-21 22:05:57,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:05:57,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 22:05:57,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:05:57,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:05:57,059 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 22:05:57,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:57,060 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:05:57,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:05:57,060 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:05:57,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:05:57,063 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:57,063 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] [2020-07-21 22:05:57,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:57,277 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:57,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:57,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 22:05:57,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:57,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266725477] [2020-07-21 22:05:57,279 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:57,312 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:57,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:57,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:05:57,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:57,371 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 22:05:57,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:57,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:57,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:57,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:57,712 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:05:57,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266725477] [2020-07-21 22:05:57,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:05:57,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:05:57,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927188702] [2020-07-21 22:05:57,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:05:57,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:57,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:05:57,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:05:57,718 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 22:05:57,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:57,881 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 22:05:57,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:05:57,882 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:05:57,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:57,884 INFO L225 Difference]: With dead ends: 47 [2020-07-21 22:05:57,884 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:05:57,885 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 [2020-07-21 22:05:57,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:05:57,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 22:05:57,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:05:57,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:05:57,901 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 22:05:57,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:57,902 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:05:57,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:05:57,902 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:05:57,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 22:05:57,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:57,910 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] [2020-07-21 22:05:58,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:58,115 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:58,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:58,116 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 22:05:58,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:58,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254655296] [2020-07-21 22:05:58,118 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:58,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:58,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:58,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:05:58,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:58,231 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 22:05:58,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:58,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:58,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:58,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:58,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:58,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:05:58,894 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 22:05:58,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254655296] [2020-07-21 22:05:58,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:05:58,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:05:58,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108850488] [2020-07-21 22:05:58,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:05:58,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:58,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:05:58,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:05:58,897 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 22:05:59,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:59,090 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 22:05:59,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:05:59,091 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 22:05:59,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:59,098 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:05:59,098 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:05:59,100 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 [2020-07-21 22:05:59,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:05:59,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 22:05:59,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:05:59,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:05:59,133 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 22:05:59,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:59,134 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:05:59,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:05:59,134 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:05:59,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 22:05:59,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:59,147 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] [2020-07-21 22:05:59,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:59,361 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:59,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:59,362 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 22:05:59,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:59,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1619013488] [2020-07-21 22:05:59,363 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:59,414 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:05:59,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:59,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:05:59,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:59,529 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 22:05:59,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:00,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:00,256 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 22:06:00,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1619013488] [2020-07-21 22:06:00,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:00,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:06:00,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358881691] [2020-07-21 22:06:00,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:06:00,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:00,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:06:00,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:06:00,260 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 22:06:00,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:00,428 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 22:06:00,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:06:00,431 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 22:06:00,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:00,434 INFO L225 Difference]: With dead ends: 57 [2020-07-21 22:06:00,434 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:06:00,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:00,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:06:00,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 22:06:00,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:06:00,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:06:00,451 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 22:06:00,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:00,452 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:06:00,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:06:00,452 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:06:00,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 22:06:00,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:00,454 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] [2020-07-21 22:06:00,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:00,670 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:00,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:00,671 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 22:06:00,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:00,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618158438] [2020-07-21 22:06:00,672 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:00,735 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:00,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:00,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:06:00,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:00,837 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 22:06:00,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:01,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:01,928 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:06:01,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618158438] [2020-07-21 22:06:01,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:01,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:06:01,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816671200] [2020-07-21 22:06:01,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:06:01,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:01,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:06:01,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:06:01,933 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 22:06:02,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:02,247 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 22:06:02,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:06:02,248 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 22:06:02,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:02,251 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:06:02,251 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:06:02,252 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 [2020-07-21 22:06:02,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:06:02,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 22:06:02,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:06:02,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:06:02,270 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 22:06:02,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:02,271 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:06:02,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:06:02,271 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:06:02,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:06:02,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:02,274 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] [2020-07-21 22:06:02,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:02,490 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:02,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:02,490 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 22:06:02,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:02,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1734905028] [2020-07-21 22:06:02,492 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:02,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:02,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:02,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:06:02,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:02,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 22:06:02,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:03,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:03,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 22:06:03,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1734905028] [2020-07-21 22:06:03,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:03,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:06:03,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834455913] [2020-07-21 22:06:03,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:06:03,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:03,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:06:03,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:06:03,864 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 22:06:04,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:04,046 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 22:06:04,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:06:04,049 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 22:06:04,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:04,052 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:06:04,052 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 22:06:04,054 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 [2020-07-21 22:06:04,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 22:06:04,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 22:06:04,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:06:04,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:06:04,074 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 22:06:04,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:04,075 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:06:04,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:06:04,075 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:06:04,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 22:06:04,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:04,080 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] [2020-07-21 22:06:04,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:04,292 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:04,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:04,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 22:06:04,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:04,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80861332] [2020-07-21 22:06:04,294 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:04,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:04,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:04,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:06:04,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:04,498 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 22:06:04,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:05,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:06,510 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 22:06:06,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80861332] [2020-07-21 22:06:06,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:06,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:06:06,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555498618] [2020-07-21 22:06:06,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:06:06,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:06,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:06:06,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:06,514 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 22:06:06,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:06,761 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 22:06:06,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:06:06,762 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 22:06:06,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:06,767 INFO L225 Difference]: With dead ends: 72 [2020-07-21 22:06:06,768 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 22:06:06,769 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 [2020-07-21 22:06:06,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 22:06:06,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 22:06:06,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:06:06,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:06:06,802 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 22:06:06,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:06,804 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:06:06,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:06:06,805 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:06:06,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 22:06:06,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:06,811 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] [2020-07-21 22:06:07,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:07,026 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:07,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:07,027 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 22:06:07,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:07,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [479265118] [2020-07-21 22:06:07,028 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:07,130 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:07,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:07,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:06:07,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:07,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 22:06:07,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:08,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:08,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:09,372 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 22:06:09,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [479265118] [2020-07-21 22:06:09,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:09,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:06:09,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493963975] [2020-07-21 22:06:09,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:06:09,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:09,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:06:09,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:09,376 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 22:06:09,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:09,628 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 22:06:09,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:06:09,629 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 22:06:09,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:09,633 INFO L225 Difference]: With dead ends: 77 [2020-07-21 22:06:09,634 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 22:06:09,635 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 [2020-07-21 22:06:09,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 22:06:09,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 22:06:09,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:06:09,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:06:09,649 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 22:06:09,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:09,650 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:06:09,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:06:09,650 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:06:09,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 22:06:09,661 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:09,662 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] [2020-07-21 22:06:09,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:09,875 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:09,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:09,876 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 22:06:09,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:09,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755676649] [2020-07-21 22:06:09,877 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:10,016 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:10,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:10,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:06:10,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:10,422 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 22:06:10,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:12,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:13,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:13,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:13,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:13,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:13,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:13,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:13,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:14,171 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 22:06:14,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755676649] [2020-07-21 22:06:14,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:14,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:06:14,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570839603] [2020-07-21 22:06:14,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:06:14,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:14,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:06:14,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:06:14,174 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 22:06:14,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:14,708 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 22:06:14,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:06:14,709 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 22:06:14,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:14,716 INFO L225 Difference]: With dead ends: 82 [2020-07-21 22:06:14,716 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 22:06:14,718 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 [2020-07-21 22:06:14,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 22:06:14,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 22:06:14,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:06:14,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:06:14,747 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 22:06:14,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:14,750 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:06:14,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:06:14,750 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:06:14,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 22:06:14,754 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:14,754 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] [2020-07-21 22:06:14,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:14,968 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:14,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:14,969 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 22:06:14,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:14,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134250002] [2020-07-21 22:06:14,971 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:15,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:15,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:15,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:06:15,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:15,343 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 22:06:15,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:17,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:17,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:17,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:18,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:18,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:18,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:18,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:18,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:18,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:18,590 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 22:06:18,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134250002] [2020-07-21 22:06:18,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:18,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:06:18,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695619271] [2020-07-21 22:06:18,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:06:18,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:18,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:06:18,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:06:18,593 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 22:06:18,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:18,910 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 22:06:18,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:06:18,911 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 22:06:18,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:18,914 INFO L225 Difference]: With dead ends: 87 [2020-07-21 22:06:18,914 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 22:06:18,916 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 [2020-07-21 22:06:18,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 22:06:18,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 22:06:18,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:06:18,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:06:18,948 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 22:06:18,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:18,950 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:06:18,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:06:18,950 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:06:18,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 22:06:18,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:18,965 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] [2020-07-21 22:06:19,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:19,180 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:19,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:19,181 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 22:06:19,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:19,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569343523] [2020-07-21 22:06:19,181 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:19,424 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:19,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:19,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:06:19,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:20,380 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 22:06:20,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:24,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:24,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:25,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:26,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:27,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:27,685 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 22:06:27,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569343523] [2020-07-21 22:06:27,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:27,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:06:27,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462928881] [2020-07-21 22:06:27,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:06:27,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:27,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:06:27,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:06:27,690 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 22:06:28,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:28,473 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 22:06:28,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:06:28,474 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 22:06:28,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:28,480 INFO L225 Difference]: With dead ends: 92 [2020-07-21 22:06:28,481 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 22:06:28,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:06:28,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 22:06:28,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 22:06:28,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:06:28,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:06:28,502 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 22:06:28,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:28,504 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:06:28,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:06:28,504 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:06:28,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-21 22:06:28,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:28,513 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 79, 47, 47, 47, 47, 47, 47, 47, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:28,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:28,728 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:28,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:28,729 INFO L82 PathProgramCache]: Analyzing trace with hash -312379166, now seen corresponding path program 7 times [2020-07-21 22:06:28,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:28,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1355424050] [2020-07-21 22:06:28,730 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:28,939 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:28,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:28,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:06:28,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:29,252 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3394 refuted. 0 times theorem prover too weak. 21370 trivial. 0 not checked. [2020-07-21 22:06:29,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:32,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:32,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:32,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:33,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:33,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:33,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:33,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:33,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:34,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:34,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:34,691 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3471 refuted. 0 times theorem prover too weak. 21293 trivial. 0 not checked. [2020-07-21 22:06:34,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1355424050] [2020-07-21 22:06:34,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:34,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:06:34,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835122212] [2020-07-21 22:06:34,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:06:34,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:34,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:06:34,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:06:34,706 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 22:06:35,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:35,340 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 22:06:35,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:06:35,341 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 656 [2020-07-21 22:06:35,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:35,347 INFO L225 Difference]: With dead ends: 97 [2020-07-21 22:06:35,347 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 22:06:35,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1319 GetRequests, 1276 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:06:35,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 22:06:35,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 22:06:35,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:06:35,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:06:35,364 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 656 [2020-07-21 22:06:35,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:35,366 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:06:35,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:06:35,366 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:06:35,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1275 [2020-07-21 22:06:35,383 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:35,384 INFO L422 BasicCegarLoop]: trace histogram [195, 195, 98, 97, 97, 97, 97, 97, 97, 97, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:35,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:35,598 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:35,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:35,600 INFO L82 PathProgramCache]: Analyzing trace with hash 971855614, now seen corresponding path program 8 times [2020-07-21 22:06:35,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:35,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928327549] [2020-07-21 22:06:35,601 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:35,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:35,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:35,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:06:35,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:36,761 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7570 refuted. 0 times theorem prover too weak. 90202 trivial. 0 not checked. [2020-07-21 22:06:36,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:41,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:43,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:44,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:45,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:45,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:45,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:45,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:46,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:46,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:46,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:46,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:46,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:46,936 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7662 refuted. 0 times theorem prover too weak. 90110 trivial. 0 not checked. [2020-07-21 22:06:46,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928327549] [2020-07-21 22:06:46,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:46,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:06:46,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618428778] [2020-07-21 22:06:46,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:06:46,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:46,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:06:46,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:06:46,941 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 22:06:47,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:47,848 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 22:06:47,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:06:47,850 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1274 [2020-07-21 22:06:47,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:47,856 INFO L225 Difference]: With dead ends: 102 [2020-07-21 22:06:47,856 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 22:06:47,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2509 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:06:47,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 22:06:47,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 22:06:47,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:06:47,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:06:47,876 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1274 [2020-07-21 22:06:47,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:47,878 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:06:47,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:06:47,878 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:06:47,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1901 [2020-07-21 22:06:47,923 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:47,924 INFO L422 BasicCegarLoop]: trace histogram [279, 279, 219, 139, 139, 139, 139, 139, 139, 139, 80, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:48,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:48,138 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:48,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:48,141 INFO L82 PathProgramCache]: Analyzing trace with hash -112815412, now seen corresponding path program 8 times [2020-07-21 22:06:48,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:48,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573739023] [2020-07-21 22:06:48,142 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:48,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:48,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:48,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:06:48,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:50,271 INFO L134 CoverageAnalysis]: Checked inductivity of 217359 backedges. 1595 proven. 11933 refuted. 0 times theorem prover too weak. 203831 trivial. 0 not checked. [2020-07-21 22:06:50,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:57,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:01,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:01,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:01,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:04,183 INFO L134 CoverageAnalysis]: Checked inductivity of 217359 backedges. 1595 proven. 12033 refuted. 0 times theorem prover too weak. 203731 trivial. 0 not checked. [2020-07-21 22:07:04,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573739023] [2020-07-21 22:07:04,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:04,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:07:04,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346637298] [2020-07-21 22:07:04,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:07:04,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:04,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:07:04,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:07:04,188 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 22:07:05,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:05,308 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 22:07:05,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:07:05,309 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1900 [2020-07-21 22:07:05,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:05,318 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:07:05,319 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 22:07:05,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3808 GetRequests, 3760 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:07:05,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 22:07:05,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 22:07:05,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:07:05,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:07:05,345 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1900 [2020-07-21 22:07:05,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:05,348 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:07:05,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:07:05,348 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:07:05,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2029 [2020-07-21 22:07:05,397 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:05,398 INFO L422 BasicCegarLoop]: trace histogram [311, 311, 156, 155, 155, 155, 155, 155, 155, 155, 155, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:05,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:05,608 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:05,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:05,609 INFO L82 PathProgramCache]: Analyzing trace with hash -2013442466, now seen corresponding path program 9 times [2020-07-21 22:07:05,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:05,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [516415768] [2020-07-21 22:07:05,610 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:06,094 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:06,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:06,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 1128 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:07:06,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:08,232 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13739 refuted. 0 times theorem prover too weak. 236697 trivial. 0 not checked. [2020-07-21 22:07:08,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:15,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:19,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:21,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:22,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:22,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:26,350 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13856 refuted. 0 times theorem prover too weak. 236580 trivial. 0 not checked. [2020-07-21 22:07:26,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [516415768] [2020-07-21 22:07:26,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:26,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:07:26,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937635652] [2020-07-21 22:07:26,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:07:26,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:26,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:07:26,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:07:26,354 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 22:07:27,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:27,665 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 22:07:27,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:07:27,667 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2028 [2020-07-21 22:07:27,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:27,674 INFO L225 Difference]: With dead ends: 112 [2020-07-21 22:07:27,674 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:07:27,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4066 GetRequests, 4013 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:07:27,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:07:27,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 22:07:27,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:07:27,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:07:27,694 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2028 [2020-07-21 22:07:27,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:27,696 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:07:27,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:07:27,696 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:07:27,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3091 [2020-07-21 22:07:27,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:27,772 INFO L422 BasicCegarLoop]: trace histogram [453, 453, 365, 226, 226, 226, 226, 226, 226, 226, 139, 88, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:27,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:27,973 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:27,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:27,976 INFO L82 PathProgramCache]: Analyzing trace with hash 726071343, now seen corresponding path program 9 times [2020-07-21 22:07:27,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:27,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689248982] [2020-07-21 22:07:27,977 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:28,635 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:28,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:28,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 1712 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:07:28,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:32,878 INFO L134 CoverageAnalysis]: Checked inductivity of 577642 backedges. 2981 proven. 21869 refuted. 0 times theorem prover too weak. 552792 trivial. 0 not checked. [2020-07-21 22:07:32,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:43,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:49,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:52,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:52,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:54,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:59,656 INFO L134 CoverageAnalysis]: Checked inductivity of 577642 backedges. 2981 proven. 21995 refuted. 0 times theorem prover too weak. 552666 trivial. 0 not checked. [2020-07-21 22:07:59,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689248982] [2020-07-21 22:07:59,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:59,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:07:59,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579909493] [2020-07-21 22:07:59,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:07:59,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:59,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:07:59,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:07:59,663 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 22:08:00,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:00,743 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 22:08:00,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:08:00,745 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3090 [2020-07-21 22:08:00,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:00,756 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:08:00,756 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 22:08:00,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6189 GetRequests, 6136 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:08:00,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 22:08:00,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 22:08:00,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:08:00,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:08:00,786 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3090 [2020-07-21 22:08:00,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:00,789 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:08:00,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:08:00,790 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:08:01,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4837 [2020-07-21 22:08:01,110 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:01,114 INFO L422 BasicCegarLoop]: trace histogram [743, 743, 372, 371, 371, 371, 371, 371, 371, 371, 371, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:01,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:01,330 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:01,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:01,335 INFO L82 PathProgramCache]: Analyzing trace with hash -2144636724, now seen corresponding path program 10 times [2020-07-21 22:08:01,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:01,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1935356170] [2020-07-21 22:08:01,336 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:02,470 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:02,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:02,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 2694 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:08:02,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:12,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1445787 backedges. 4470 proven. 37981 refuted. 0 times theorem prover too weak. 1403336 trivial. 0 not checked. [2020-07-21 22:08:12,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:35,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:43,590 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 22:08:44,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:48,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:51,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:52,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:54,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:54,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:54,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:54,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:55,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:55,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:06,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1445787 backedges. 4470 proven. 38126 refuted. 0 times theorem prover too weak. 1403191 trivial. 0 not checked. [2020-07-21 22:09:06,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1935356170] [2020-07-21 22:09:06,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:06,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:09:06,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455298490] [2020-07-21 22:09:06,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:09:06,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:06,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:09:06,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:09:06,258 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 22:09:07,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:07,276 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 22:09:07,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:09:07,279 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4836 [2020-07-21 22:09:07,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:07,291 INFO L225 Difference]: With dead ends: 122 [2020-07-21 22:09:07,292 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 22:09:07,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9683 GetRequests, 9625 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:09:07,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 22:09:07,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 22:09:07,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:09:07,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:09:07,318 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4836 [2020-07-21 22:09:07,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:07,323 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:09:07,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:09:07,323 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:09:07,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6603 [2020-07-21 22:09:07,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:07,684 INFO L422 BasicCegarLoop]: trace histogram [971, 971, 769, 485, 485, 485, 485, 485, 485, 485, 284, 202, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:07,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:07,886 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:07,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:07,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1818186100, now seen corresponding path program 10 times [2020-07-21 22:09:07,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:07,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337069987] [2020-07-21 22:09:07,889 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:09,253 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:09,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:09,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 3667 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:09:09,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:24,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2648516 backedges. 6545 proven. 52718 refuted. 0 times theorem prover too weak. 2589253 trivial. 0 not checked. [2020-07-21 22:09:24,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:57,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:12,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:12,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:20,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:20,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:24,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:24,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:27,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:27,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:29,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:29,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:30,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:30,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:30,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:30,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:30,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:30,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:47,527 INFO L134 CoverageAnalysis]: Checked inductivity of 2648516 backedges. 6545 proven. 52873 refuted. 0 times theorem prover too weak. 2589098 trivial. 0 not checked. [2020-07-21 22:10:47,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337069987] [2020-07-21 22:10:47,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:10:47,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:10:47,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027962413] [2020-07-21 22:10:47,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:10:47,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:10:47,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:10:47,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:10:47,535 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 22:10:49,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:10:49,488 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 22:10:49,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:10:49,495 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 6602 [2020-07-21 22:10:49,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:10:49,506 INFO L225 Difference]: With dead ends: 127 [2020-07-21 22:10:49,507 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 22:10:49,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13214 GetRequests, 13156 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:10:49,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 22:10:49,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 22:10:49,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:10:49,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:10:49,531 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 6602 [2020-07-21 22:10:49,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:10:49,537 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:10:49,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:10:49,537 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:10:50,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6319 [2020-07-21 22:10:50,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:10:50,025 INFO L422 BasicCegarLoop]: trace histogram [971, 971, 486, 485, 485, 485, 485, 485, 485, 485, 485, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:10:50,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:10:50,241 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:10:50,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:10:50,245 INFO L82 PathProgramCache]: Analyzing trace with hash -2062256872, now seen corresponding path program 11 times [2020-07-21 22:10:50,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:10:50,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194759523] [2020-07-21 22:10:50,246 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:10:51,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:10:51,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:10:51,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 3519 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:10:51,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:11:05,774 INFO L134 CoverageAnalysis]: Checked inductivity of 2470590 backedges. 6730 proven. 54161 refuted. 0 times theorem prover too weak. 2409699 trivial. 0 not checked. [2020-07-21 22:11:05,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:11:13,909 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:11:14,018 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:11:14,128 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 22:11:14,236 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 22:11:14,342 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 22:11:14,443 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 22:11:43,020 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:11:43,125 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:11:44,849 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 22:11:44,964 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 22:11:45,092 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:11:45,206 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:11:45,311 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 22:11:46,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:56,611 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:12:02,996 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:12:03,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:13,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:13,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:20,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:20,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:23,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:26,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:26,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:27,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:27,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:28,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:28,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:28,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:28,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:28,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:42,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2470590 backedges. 6730 proven. 54337 refuted. 0 times theorem prover too weak. 2409523 trivial. 0 not checked. [2020-07-21 22:12:42,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194759523] [2020-07-21 22:12:42,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:12:42,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:12:42,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021370188] [2020-07-21 22:12:42,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:12:42,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:12:42,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:12:42,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:12:42,726 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 22:12:44,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:12:44,643 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 22:12:44,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:12:44,644 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6318 [2020-07-21 22:12:44,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:12:44,654 INFO L225 Difference]: With dead ends: 132 [2020-07-21 22:12:44,654 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 22:12:44,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12648 GetRequests, 12585 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:12:44,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 22:12:44,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 22:12:44,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:12:44,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:12:44,684 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6318 [2020-07-21 22:12:44,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:12:44,688 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:12:44,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:12:44,689 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:12:45,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5841 [2020-07-21 22:12:45,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:12:45,082 INFO L422 BasicCegarLoop]: trace histogram [863, 863, 655, 431, 431, 431, 431, 431, 431, 431, 224, 208, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:12:45,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:12:45,298 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:12:45,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:12:45,300 INFO L82 PathProgramCache]: Analyzing trace with hash -25890228, now seen corresponding path program 11 times [2020-07-21 22:12:45,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:12:45,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688109643] [2020-07-21 22:12:45,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:12:46,611 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:12:46,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:12:46,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 3242 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:12:46,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:12:58,762 INFO L134 CoverageAnalysis]: Checked inductivity of 2072657 backedges. 5634 proven. 51495 refuted. 0 times theorem prover too weak. 2015528 trivial. 0 not checked. [2020-07-21 22:12:58,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:13:04,307 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:13:07,854 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:13:07,963 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:13:08,083 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 22:13:08,195 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 22:13:08,308 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 22:13:08,417 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 22:13:41,085 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 22:13:41,285 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 22:13:42,569 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 22:13:42,682 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 22:13:42,803 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:13:42,926 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:13:44,702 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 22:13:44,835 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 22:13:44,975 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:13:45,110 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:13:45,251 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 22:13:45,376 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 22:13:45,492 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 22:13:45,602 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 22:13:45,709 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 22:13:46,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:46,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:03,303 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:14:04,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:13,697 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 22:14:13,803 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 22:14:13,916 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 22:14:14,024 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 22:14:14,145 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 22:14:14,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:14,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:20,772 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 22:14:20,987 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 22:14:21,097 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 22:14:21,214 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:14:21,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:21,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:27,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:27,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:30,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:30,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:32,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:32,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:33,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:33,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:33,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:33,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:34,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:50,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2072657 backedges. 5634 proven. 51682 refuted. 0 times theorem prover too weak. 2015341 trivial. 0 not checked. [2020-07-21 22:14:50,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688109643] [2020-07-21 22:14:50,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:14:50,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:14:50,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241606818] [2020-07-21 22:14:50,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:14:50,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:14:50,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:14:50,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:14:50,763 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 22:14:54,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:14:54,439 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 22:14:54,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:14:54,443 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5840 [2020-07-21 22:14:54,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:14:54,457 INFO L225 Difference]: With dead ends: 137 [2020-07-21 22:14:54,458 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 22:14:54,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11691 GetRequests, 11628 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:14:54,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 22:14:54,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 22:14:54,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:14:54,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:14:54,502 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5840 [2020-07-21 22:14:54,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:14:54,509 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:14:54,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:14:54,509 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:14:56,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15445 [2020-07-21 22:14:56,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:14:57,002 INFO L422 BasicCegarLoop]: trace histogram [2375, 2375, 1188, 1187, 1187, 1187, 1187, 1187, 1187, 1187, 1187, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:14:57,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:14:57,204 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:14:57,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:14:57,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1204488308, now seen corresponding path program 12 times [2020-07-21 22:14:57,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:14:57,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898574173] [2020-07-21 22:14:57,209 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:15:00,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:15:00,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:15:00,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 8610 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 22:15:00,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:16:34,385 INFO L134 CoverageAnalysis]: Checked inductivity of 14795955 backedges. 15649 proven. 147323 refuted. 0 times theorem prover too weak. 14632983 trivial. 0 not checked. [2020-07-21 22:16:34,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:18:09,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:34,460 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:18:38,488 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 22:18:38,592 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 22:18:39,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:39,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:55,396 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 1