/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:11,649 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:21:11,653 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:21:11,674 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:21:11,675 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:11,678 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:11,680 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:11,683 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:11,686 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:11,688 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:11,691 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:11,693 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:11,693 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:11,695 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:11,697 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:11,699 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:11,704 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:11,706 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:11,712 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:11,716 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:11,723 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:11,728 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:11,732 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:11,734 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:11,743 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:21:11,773 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:21:11,775 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:21:11,778 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:21:11,780 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:21:11,813 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:11,814 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:11,818 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:11,819 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:11,819 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:11,820 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:11,820 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:11,820 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:11,820 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:11,821 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:11,823 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:11,824 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:11,824 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:11,825 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:11,825 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:11,825 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:11,826 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:11,826 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:11,826 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:11,827 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:11,827 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:11,827 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:11,828 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:11,828 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:11,828 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:11,828 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:11,828 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:11,829 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:11,829 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:11,829 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:21:12,255 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:12,278 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:12,289 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:12,293 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:12,295 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:12,296 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 13:21:12,417 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7e947d15/823cd38f78e6497abc921e129fcfbeef/FLAGd1a32582d [2020-07-20 13:21:13,244 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:13,245 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 13:21:13,263 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7e947d15/823cd38f78e6497abc921e129fcfbeef/FLAGd1a32582d [2020-07-20 13:21:13,493 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7e947d15/823cd38f78e6497abc921e129fcfbeef [2020-07-20 13:21:13,515 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:13,522 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:13,527 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:13,528 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:13,535 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:13,537 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,544 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4eab94f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13, skipping insertion in model container [2020-07-20 13:21:13,544 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,561 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:13,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:13,859 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:13,873 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:13,894 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:13,913 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:13,914 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13 WrapperNode [2020-07-20 13:21:13,915 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:13,916 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:13,916 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:13,917 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:13,936 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,937 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,944 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,945 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,954 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,956 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... [2020-07-20 13:21:13,959 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:13,960 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:13,960 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:13,960 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:13,962 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:14,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:14,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:14,203 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 13:21:14,203 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:14,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:21:14,205 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:14,205 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 13:21:14,205 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:14,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:14,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:14,553 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:14,554 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:14,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:14 BoogieIcfgContainer [2020-07-20 13:21:14,578 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:14,584 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:14,588 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:14,600 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:14,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:13" (1/3) ... [2020-07-20 13:21:14,612 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b7b202c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:14, skipping insertion in model container [2020-07-20 13:21:14,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:13" (2/3) ... [2020-07-20 13:21:14,613 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b7b202c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:14, skipping insertion in model container [2020-07-20 13:21:14,613 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:14" (3/3) ... [2020-07-20 13:21:14,620 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-20 13:21:14,673 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:14,694 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:21:14,751 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:21:14,792 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:14,792 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:14,793 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:14,793 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:14,793 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:14,793 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:14,793 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:14,793 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:14,826 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:21:14,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:14,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:14,842 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:14,843 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:14,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:14,853 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 13:21:14,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:14,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [183427438] [2020-07-20 13:21:14,866 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:14,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:14,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:14,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:15,139 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:15,140 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:15,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [183427438] [2020-07-20 13:21:15,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:15,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:15,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14993505] [2020-07-20 13:21:15,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:15,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:15,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:15,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:15,182 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 13:21:15,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,362 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:21:15,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:15,365 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:21:15,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,379 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:21:15,379 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:21:15,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:15,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:21:15,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:21:15,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:15,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:15,461 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:21:15,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:15,463 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:15,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:15,464 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:15,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:21:15,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:15,468 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:15,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,686 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:15,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:15,687 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 13:21:15,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:15,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237658416] [2020-07-20 13:21:15,689 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:15,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:15,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:15,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:15,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:15,810 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:15,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237658416] [2020-07-20 13:21:15,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:15,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:15,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129213150] [2020-07-20 13:21:15,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:15,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:15,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:15,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:15,825 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:21:15,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,965 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:21:15,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:15,969 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:21:15,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,971 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:21:15,972 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:21:15,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:15,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:21:16,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:21:16,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:16,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:16,015 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:21:16,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:16,016 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:16,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:16,017 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:16,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:21:16,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:16,026 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:16,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:16,243 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:16,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:16,246 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 13:21:16,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:16,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883448394] [2020-07-20 13:21:16,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:16,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:16,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:16,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:16,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:16,368 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:16,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:16,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,702 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:16,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883448394] [2020-07-20 13:21:16,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:16,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:16,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884990909] [2020-07-20 13:21:16,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:16,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:16,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:16,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:16,708 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 13:21:16,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:16,914 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 13:21:16,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:16,916 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 13:21:16,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:16,919 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:21:16,919 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:21:16,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:16,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:21:16,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:21:16,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:16,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:16,934 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 13:21:16,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:16,934 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:16,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:16,935 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:16,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:21:16,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:16,939 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:17,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,154 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:17,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:17,154 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 13:21:17,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:17,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820539023] [2020-07-20 13:21:17,156 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,206 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:17,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:17,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:17,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:17,264 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:21:17,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:17,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:17,546 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:17,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820539023] [2020-07-20 13:21:17,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:17,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:17,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247721246] [2020-07-20 13:21:17,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:17,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:17,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:17,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:17,550 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 13:21:17,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:17,718 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 13:21:17,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:17,720 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 13:21:17,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:17,724 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:21:17,724 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:21:17,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:17,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:21:17,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 13:21:17,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:17,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:17,738 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 13:21:17,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:17,739 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:17,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:17,739 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:17,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:21:17,742 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:17,742 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:17,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,957 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:17,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:17,959 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 13:21:17,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:17,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616477893] [2020-07-20 13:21:17,961 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:18,049 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:18,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:18,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:18,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:18,151 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:21:18,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:18,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,645 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:18,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616477893] [2020-07-20 13:21:18,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:18,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:18,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976855948] [2020-07-20 13:21:18,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:18,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:18,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:18,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:18,651 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 13:21:18,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:18,909 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 13:21:18,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:18,912 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 13:21:18,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:18,922 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:21:18,923 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 13:21:18,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:18,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 13:21:18,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 13:21:18,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:18,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:18,943 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 13:21:18,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:18,943 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:18,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:18,944 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:18,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:21:18,946 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:18,947 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:19,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:19,162 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:19,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:19,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 13:21:19,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:19,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791615845] [2020-07-20 13:21:19,164 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:19,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:19,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:19,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:19,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:19,282 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 13:21:19,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:19,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,723 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:19,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791615845] [2020-07-20 13:21:19,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:19,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:19,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932892488] [2020-07-20 13:21:19,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:19,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:19,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:19,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:19,728 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 13:21:19,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:19,924 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 13:21:19,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:19,925 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:21:19,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:19,929 INFO L225 Difference]: With dead ends: 47 [2020-07-20 13:21:19,929 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 13:21:19,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:19,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 13:21:19,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 13:21:19,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:19,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:19,949 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 13:21:19,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:19,949 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:19,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:19,950 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:19,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 13:21:19,953 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:19,953 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:20,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:20,168 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:20,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:20,169 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 13:21:20,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:20,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747176827] [2020-07-20 13:21:20,170 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:20,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:20,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:20,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:20,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:20,316 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:21:20,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:20,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,237 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:21:21,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747176827] [2020-07-20 13:21:21,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:21,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:21,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518778096] [2020-07-20 13:21:21,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:21,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:21,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:21,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:21,241 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 13:21:21,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:21,571 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 13:21:21,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:21,572 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 13:21:21,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:21,575 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:21:21,575 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:21:21,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:21,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:21:21,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 13:21:21,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:21,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:21,594 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 13:21:21,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:21,595 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:21,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:21,596 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:21,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 13:21:21,599 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:21,600 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:21,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:21,806 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:21,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:21,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 13:21:21,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:21,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613665700] [2020-07-20 13:21:21,809 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:21,881 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:21,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:21,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:21,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:21,997 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 13:21:21,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:22,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,907 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 13:21:22,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613665700] [2020-07-20 13:21:22,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:22,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:22,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907424542] [2020-07-20 13:21:22,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:22,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:22,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:22,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:22,918 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 13:21:23,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:23,117 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 13:21:23,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:23,118 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 13:21:23,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:23,122 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:21:23,123 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:21:23,124 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 [2020-07-20 13:21:23,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:21:23,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 13:21:23,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:23,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:23,140 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 13:21:23,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:23,141 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:23,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:23,142 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:23,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:21:23,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:23,146 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:23,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:23,361 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:23,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:23,363 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 13:21:23,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:23,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1456393258] [2020-07-20 13:21:23,364 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:23,444 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:23,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:23,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:23,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:23,563 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:21:23,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:24,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,876 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:21:24,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1456393258] [2020-07-20 13:21:24,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:24,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:24,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657412393] [2020-07-20 13:21:24,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:24,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:24,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:24,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:24,883 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 13:21:25,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:25,318 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:21:25,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:25,319 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 13:21:25,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:25,323 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:21:25,323 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:21:25,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:25,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:21:25,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:21:25,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:25,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:25,343 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:21:25,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:25,344 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:25,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:25,344 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:25,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 13:21:25,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:25,350 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:25,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:25,564 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:25,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:25,565 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 13:21:25,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:25,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541407055] [2020-07-20 13:21:25,566 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:25,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:25,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:25,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:25,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:25,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 13:21:25,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:26,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:26,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 13:21:27,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541407055] [2020-07-20 13:21:27,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:27,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:27,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546978017] [2020-07-20 13:21:27,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:27,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:27,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:27,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:27,253 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 13:21:27,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:27,546 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 13:21:27,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:27,547 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 13:21:27,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:27,554 INFO L225 Difference]: With dead ends: 67 [2020-07-20 13:21:27,554 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 13:21:27,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:27,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 13:21:27,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 13:21:27,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:27,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:27,593 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 13:21:27,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:27,595 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:27,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:27,596 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:27,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 13:21:27,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:27,602 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:27,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:27,818 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:27,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:27,819 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 13:21:27,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:27,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120239185] [2020-07-20 13:21:27,820 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:27,973 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:27,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:27,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:27,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:28,160 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 13:21:28,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:29,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,581 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 13:21:30,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120239185] [2020-07-20 13:21:30,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:30,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:30,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614803636] [2020-07-20 13:21:30,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:30,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:30,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:30,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:30,593 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 13:21:30,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:30,958 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 13:21:30,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:30,959 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 13:21:30,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:30,965 INFO L225 Difference]: With dead ends: 72 [2020-07-20 13:21:30,966 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 13:21:30,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:30,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 13:21:31,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 13:21:31,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:31,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:31,011 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 13:21:31,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:31,016 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:31,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:31,016 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:31,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 13:21:31,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:31,026 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:31,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:31,241 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:31,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:31,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 13:21:31,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:31,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270610673] [2020-07-20 13:21:31,243 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:31,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:31,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:31,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:31,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:31,682 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 13:21:31,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:33,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:33,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,425 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 13:21:34,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270610673] [2020-07-20 13:21:34,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:34,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:34,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996778189] [2020-07-20 13:21:34,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:34,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:34,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:34,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:34,437 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 13:21:34,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:34,746 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 13:21:34,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:34,748 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 13:21:34,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:34,753 INFO L225 Difference]: With dead ends: 77 [2020-07-20 13:21:34,753 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 13:21:34,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:34,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 13:21:34,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 13:21:34,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:34,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:34,771 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 13:21:34,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:34,772 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:34,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:34,773 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:34,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 13:21:34,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:34,787 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:35,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:35,002 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:35,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:35,004 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 13:21:35,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:35,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118561615] [2020-07-20 13:21:35,004 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:35,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:35,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:35,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 925 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:35,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:35,545 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 13:21:35,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:37,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,149 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 13:21:39,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118561615] [2020-07-20 13:21:39,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:39,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:39,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197520189] [2020-07-20 13:21:39,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:39,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:39,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:39,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:39,151 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 13:21:39,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:39,636 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 13:21:39,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:39,637 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 13:21:39,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:39,641 INFO L225 Difference]: With dead ends: 82 [2020-07-20 13:21:39,642 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 13:21:39,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:39,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 13:21:39,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 13:21:39,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:39,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:39,655 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 13:21:39,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:39,656 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:39,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:39,656 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:39,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 13:21:39,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:39,660 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:39,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:39,874 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:39,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:39,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 13:21:39,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:39,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957328727] [2020-07-20 13:21:39,877 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:40,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:40,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:40,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:40,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:40,351 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 13:21:40,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:42,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,610 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 13:21:43,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957328727] [2020-07-20 13:21:43,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:43,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:43,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837798334] [2020-07-20 13:21:43,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:43,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:43,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:43,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:43,613 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 13:21:43,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:43,899 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 13:21:43,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:43,900 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 13:21:43,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:43,903 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:21:43,903 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 13:21:43,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:43,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 13:21:43,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 13:21:43,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:43,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:43,919 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 13:21:43,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:43,920 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:43,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:43,920 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:43,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 13:21:43,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:43,932 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:44,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:44,146 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:44,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:44,147 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 13:21:44,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:44,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71225716] [2020-07-20 13:21:44,148 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:44,596 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:44,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:44,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 1941 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:44,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:45,229 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 13:21:45,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:48,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,065 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 13:21:52,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71225716] [2020-07-20 13:21:52,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:52,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:52,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013975873] [2020-07-20 13:21:52,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:52,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:52,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:52,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:52,069 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 13:21:52,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:52,714 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 13:21:52,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:52,715 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 13:21:52,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:52,720 INFO L225 Difference]: With dead ends: 92 [2020-07-20 13:21:52,720 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 13:21:52,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:52,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 13:21:52,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 13:21:52,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:52,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:52,736 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 13:21:52,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:52,738 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:52,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:52,738 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:52,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 651 [2020-07-20 13:21:52,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:52,744 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 73, 47, 47, 47, 47, 47, 47, 47, 26, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:52,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:52,958 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:52,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:52,959 INFO L82 PathProgramCache]: Analyzing trace with hash -12450132, now seen corresponding path program 7 times [2020-07-20 13:21:52,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:52,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993301429] [2020-07-20 13:21:52,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:53,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:53,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:53,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 1180 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:53,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:53,624 INFO L134 CoverageAnalysis]: Checked inductivity of 24812 backedges. 501 proven. 3346 refuted. 0 times theorem prover too weak. 20965 trivial. 0 not checked. [2020-07-20 13:21:53,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:56,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,386 INFO L134 CoverageAnalysis]: Checked inductivity of 24812 backedges. 501 proven. 3423 refuted. 0 times theorem prover too weak. 20888 trivial. 0 not checked. [2020-07-20 13:21:58,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993301429] [2020-07-20 13:21:58,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:58,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:58,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538163148] [2020-07-20 13:21:58,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:58,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:58,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:58,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:58,390 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 13:21:58,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:58,902 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 13:21:58,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:58,903 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 650 [2020-07-20 13:21:58,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:58,908 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:21:58,908 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 13:21:58,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1307 GetRequests, 1264 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:58,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 13:21:58,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 13:21:58,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:58,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:58,926 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 650 [2020-07-20 13:21:58,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:58,928 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:58,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:58,928 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:58,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1496 [2020-07-20 13:21:58,958 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:58,959 INFO L422 BasicCegarLoop]: trace histogram [229, 229, 115, 114, 114, 114, 114, 114, 114, 114, 114, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:59,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:59,175 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:59,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:59,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1187543541, now seen corresponding path program 8 times [2020-07-20 13:21:59,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:59,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486545364] [2020-07-20 13:21:59,178 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:59,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:59,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:59,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 2718 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:21:59,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:00,845 INFO L134 CoverageAnalysis]: Checked inductivity of 136629 backedges. 1386 proven. 8950 refuted. 0 times theorem prover too weak. 126293 trivial. 0 not checked. [2020-07-20 13:22:00,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:05,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:08,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:08,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:09,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:09,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:09,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:09,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,583 INFO L134 CoverageAnalysis]: Checked inductivity of 136629 backedges. 1386 proven. 9042 refuted. 0 times theorem prover too weak. 126201 trivial. 0 not checked. [2020-07-20 13:22:11,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486545364] [2020-07-20 13:22:11,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:11,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:22:11,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371225632] [2020-07-20 13:22:11,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:11,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:11,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:11,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:11,588 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 13:22:12,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:12,201 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 13:22:12,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:12,202 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1495 [2020-07-20 13:22:12,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:12,209 INFO L225 Difference]: With dead ends: 102 [2020-07-20 13:22:12,209 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 13:22:12,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2999 GetRequests, 2951 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:12,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 13:22:12,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 13:22:12,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:12,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:12,236 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1495 [2020-07-20 13:22:12,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:12,239 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:12,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:12,240 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:12,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-20 13:22:12,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:12,279 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:12,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:12,494 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:12,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:12,495 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-20 13:22:12,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:12,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079030817] [2020-07-20 13:22:12,496 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:13,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:13,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:13,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 3328 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:13,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:14,856 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-20 13:22:14,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:20,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:22,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:22,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:24,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:24,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,164 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-20 13:22:27,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079030817] [2020-07-20 13:22:27,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:27,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:22:27,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039019468] [2020-07-20 13:22:27,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:27,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:27,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:27,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:27,169 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 13:22:27,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:27,694 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 13:22:27,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:27,694 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-20 13:22:27,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:27,701 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:22:27,702 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 13:22:27,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:27,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 13:22:27,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 13:22:27,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:27,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:27,720 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-20 13:22:27,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:27,722 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:27,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:27,722 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:27,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2614 [2020-07-20 13:22:27,775 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:27,776 INFO L422 BasicCegarLoop]: trace histogram [401, 401, 201, 200, 200, 200, 200, 200, 200, 200, 200, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:27,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:27,986 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:27,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:27,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1810006087, now seen corresponding path program 9 times [2020-07-20 13:22:27,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:27,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [275594333] [2020-07-20 13:22:27,989 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:28,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:28,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:28,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 4749 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:28,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:32,765 INFO L134 CoverageAnalysis]: Checked inductivity of 420300 backedges. 2669 proven. 17854 refuted. 0 times theorem prover too weak. 399777 trivial. 0 not checked. [2020-07-20 13:22:32,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:41,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:45,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:50,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:50,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:50,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:50,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:50,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:53,258 INFO L134 CoverageAnalysis]: Checked inductivity of 420300 backedges. 2669 proven. 17971 refuted. 0 times theorem prover too weak. 399660 trivial. 0 not checked. [2020-07-20 13:22:53,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [275594333] [2020-07-20 13:22:53,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:53,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:22:53,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639145593] [2020-07-20 13:22:53,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:22:53,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:53,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:22:53,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:22:53,263 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 13:22:54,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:54,096 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 13:22:54,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:54,100 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2613 [2020-07-20 13:22:54,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:54,109 INFO L225 Difference]: With dead ends: 112 [2020-07-20 13:22:54,109 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:22:54,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5236 GetRequests, 5183 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:22:54,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:22:54,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 13:22:54,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:22:54,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:22:54,130 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2613 [2020-07-20 13:22:54,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:54,133 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:22:54,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:22:54,133 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:22:54,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3553 [2020-07-20 13:22:54,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:54,239 INFO L422 BasicCegarLoop]: trace histogram [517, 517, 443, 258, 258, 258, 258, 258, 258, 258, 185, 74, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:54,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:54,440 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:54,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:54,442 INFO L82 PathProgramCache]: Analyzing trace with hash -2087937559, now seen corresponding path program 9 times [2020-07-20 13:22:54,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:54,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712867048] [2020-07-20 13:22:54,443 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:55,690 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:55,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:55,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 6405 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:55,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:00,490 INFO L134 CoverageAnalysis]: Checked inductivity of 764059 backedges. 3120 proven. 25582 refuted. 0 times theorem prover too weak. 735357 trivial. 0 not checked. [2020-07-20 13:23:00,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:13,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:18,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:21,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:21,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:22,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:23,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:23,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:29,216 INFO L134 CoverageAnalysis]: Checked inductivity of 764059 backedges. 3120 proven. 25708 refuted. 0 times theorem prover too weak. 735231 trivial. 0 not checked. [2020-07-20 13:23:29,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712867048] [2020-07-20 13:23:29,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:29,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:23:29,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905966812] [2020-07-20 13:23:29,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:23:29,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:29,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:23:29,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:23:29,222 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 13:23:30,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:30,100 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 13:23:30,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:30,101 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3552 [2020-07-20 13:23:30,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:30,109 INFO L225 Difference]: With dead ends: 117 [2020-07-20 13:23:30,110 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 13:23:30,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7113 GetRequests, 7060 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:23:30,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 13:23:30,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 13:23:30,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:23:30,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:23:30,131 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3552 [2020-07-20 13:23:30,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:30,134 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:23:30,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:23:30,135 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:23:30,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3784 [2020-07-20 13:23:30,258 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:30,260 INFO L422 BasicCegarLoop]: trace histogram [581, 581, 291, 290, 290, 290, 290, 290, 290, 290, 290, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:30,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:30,475 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:30,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:30,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1690000259, now seen corresponding path program 10 times [2020-07-20 13:23:30,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:30,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112824975] [2020-07-20 13:23:30,479 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:31,849 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:31,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:31,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 6869 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:23:31,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:37,741 INFO L134 CoverageAnalysis]: Checked inductivity of 883485 backedges. 4023 proven. 29032 refuted. 0 times theorem prover too weak. 850430 trivial. 0 not checked. [2020-07-20 13:23:37,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:51,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:51,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:04,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:06,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:07,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:08,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:08,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:15,022 INFO L134 CoverageAnalysis]: Checked inductivity of 883485 backedges. 4023 proven. 29177 refuted. 0 times theorem prover too weak. 850285 trivial. 0 not checked. [2020-07-20 13:24:15,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112824975] [2020-07-20 13:24:15,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:15,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:24:15,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125025360] [2020-07-20 13:24:15,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:24:15,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:15,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:24:15,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:24:15,028 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 13:24:17,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:17,375 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 13:24:17,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:24:17,377 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3783 [2020-07-20 13:24:17,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:17,384 INFO L225 Difference]: With dead ends: 122 [2020-07-20 13:24:17,385 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 13:24:17,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7577 GetRequests, 7519 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:24:17,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 13:24:17,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 13:24:17,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:24:17,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:24:17,411 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3783 [2020-07-20 13:24:17,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:17,415 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:24:17,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:24:17,415 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:24:18,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7737 [2020-07-20 13:24:18,209 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:18,215 INFO L422 BasicCegarLoop]: trace histogram [1139, 1139, 895, 569, 569, 569, 569, 569, 569, 569, 326, 244, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:18,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:18,431 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:18,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:18,435 INFO L82 PathProgramCache]: Analyzing trace with hash -885154388, now seen corresponding path program 10 times [2020-07-20 13:24:18,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:18,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900746735] [2020-07-20 13:24:18,437 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:21,010 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:21,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:21,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 13965 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:24:21,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:42,704 INFO L134 CoverageAnalysis]: Checked inductivity of 3638813 backedges. 6811 proven. 62742 refuted. 0 times theorem prover too weak. 3569260 trivial. 0 not checked. [2020-07-20 13:24:42,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:22,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:36,512 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:25:38,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:38,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:46,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:46,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:50,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:50,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:52,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:52,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:53,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:53,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:54,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:54,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:54,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:54,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:54,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:54,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:14,579 INFO L134 CoverageAnalysis]: Checked inductivity of 3638813 backedges. 6811 proven. 62897 refuted. 0 times theorem prover too weak. 3569105 trivial. 0 not checked. [2020-07-20 13:26:14,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900746735] [2020-07-20 13:26:14,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:14,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:26:14,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030646356] [2020-07-20 13:26:14,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:26:14,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:14,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:26:14,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:26:14,587 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 13:26:15,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:15,372 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 13:26:15,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:26:15,377 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7736 [2020-07-20 13:26:15,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:15,388 INFO L225 Difference]: With dead ends: 127 [2020-07-20 13:26:15,388 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 13:26:15,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15482 GetRequests, 15424 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:26:15,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 13:26:15,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 13:26:15,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:26:15,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:26:15,414 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7736 [2020-07-20 13:26:15,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:15,421 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:26:15,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:26:15,422 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:26:16,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11129 [2020-07-20 13:26:16,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:16,402 INFO L422 BasicCegarLoop]: trace histogram [1711, 1711, 856, 855, 855, 855, 855, 855, 855, 855, 855, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:16,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:16,603 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:16,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:16,608 INFO L82 PathProgramCache]: Analyzing trace with hash -434172532, now seen corresponding path program 11 times [2020-07-20 13:26:16,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:16,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [502744163] [2020-07-20 13:26:16,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:19,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:19,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:20,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 20193 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:26:20,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:56,765 INFO L134 CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97572 refuted. 0 times theorem prover too weak. 7569164 trivial. 0 not checked. [2020-07-20 13:26:56,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:07,663 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:27:07,769 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:28:04,213 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:28:04,320 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:28:04,434 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:28:04,550 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:28:04,659 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:28:04,766 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:28:05,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,461 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:28:33,576 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:28:33,685 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:28:33,792 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:28:34,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:47,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:47,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:56,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:56,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:57,726 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:28:59,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:00,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:00,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:01,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:01,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:02,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:03,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:03,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:03,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:03,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,402 INFO L134 CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97748 refuted. 0 times theorem prover too weak. 7568988 trivial. 0 not checked. [2020-07-20 13:29:44,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [502744163] [2020-07-20 13:29:44,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:29:44,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:29:44,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299961806] [2020-07-20 13:29:44,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:29:44,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:29:44,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:29:44,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:29:44,416 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 13:29:47,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:29:47,237 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 13:29:47,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:29:47,239 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 11128 [2020-07-20 13:29:47,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:29:47,252 INFO L225 Difference]: With dead ends: 132 [2020-07-20 13:29:47,252 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 13:29:47,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22268 GetRequests, 22205 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:29:47,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 13:29:47,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 13:29:47,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:29:47,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 13:29:47,278 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11128 [2020-07-20 13:29:47,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:29:47,284 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 13:29:47,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:29:47,284 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 13:29:47,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11741 [2020-07-20 13:29:47,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:29:47,999 INFO L422 BasicCegarLoop]: trace histogram [1711, 1711, 1467, 855, 855, 855, 855, 855, 855, 855, 612, 244, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:29:48,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:48,202 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:29:48,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:29:48,205 INFO L82 PathProgramCache]: Analyzing trace with hash 466933324, now seen corresponding path program 11 times [2020-07-20 13:29:48,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:29:48,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176885127] [2020-07-20 13:29:48,207 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:52,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:29:52,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:52,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 21163 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:29:52,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:30:40,500 INFO L134 CoverageAnalysis]: Checked inductivity of 8387271 backedges. 10309 proven. 105748 refuted. 0 times theorem prover too weak. 8271214 trivial. 0 not checked. [2020-07-20 13:30:40,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:30:45,734 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:30:45,848 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:45,968 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:49,359 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:49,467 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:49,584 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:30:49,696 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:30:54,978 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:30:55,113 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:30:55,264 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:30:55,409 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:30:55,537 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 13:30:55,657 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 13:30:55,770 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:30:55,879 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:30:55,996 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:30:56,107 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:30:56,215 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:31:21,273 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:32:05,766 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:32:07,274 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:07,378 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:08,993 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:32:09,125 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:32:09,266 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:32:09,413 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:32:14,028 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:32:14,154 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:32:14,293 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:32:14,428 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:32:14,562 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:32:14,682 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:32:14,803 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:32:14,907 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:32:15,116 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:32:15,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:15,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:58,287 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:32:58,392 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:58,502 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:33:00,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:14,661 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 13:33:14,770 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:14,885 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:16,458 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:33:16,581 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:33:16,706 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:33:16,819 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:33:17,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:17,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:29,858 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:33:30,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:30,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:30,853 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:33:35,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:35,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:39,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:39,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:40,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:41,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:42,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:42,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:42,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:42,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:42,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts