/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:43:37,577 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:43:37,580 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:43:37,599 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:43:37,599 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:43:37,601 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:43:37,603 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:43:37,613 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:43:37,616 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:43:37,617 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:43:37,617 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:43:37,618 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:43:37,618 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:43:37,619 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:43:37,620 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:43:37,622 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:43:37,624 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:43:37,628 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:43:37,629 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:43:37,633 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:43:37,637 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:43:37,638 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:43:37,640 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:43:37,641 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:43:37,646 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:43:37,660 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:43:37,661 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:43:37,662 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:43:37,663 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:43:37,686 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:43:37,686 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:43:37,688 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:43:37,689 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:43:37,689 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:43:37,689 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:43:37,689 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:43:37,689 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:43:37,690 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:43:37,690 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:43:37,691 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:43:37,691 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:43:37,691 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:43:37,692 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:43:37,692 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:43:37,692 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:43:37,692 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:43:37,693 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:43:37,693 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:43:37,693 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:43:37,693 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:43:37,693 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:37,694 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:43:37,694 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:43:37,694 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:43:37,694 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:43:37,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:37,695 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:43:37,695 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:43:37,695 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:43:37,996 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:43:38,008 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:43:38,011 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:43:38,013 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:43:38,013 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:43:38,014 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-21 19:43:38,073 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a32ed59e8/29e2ac2eb1b546ca9460f9e67365faac/FLAGb20573099 [2020-07-21 19:43:38,525 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:43:38,525 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-21 19:43:38,532 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a32ed59e8/29e2ac2eb1b546ca9460f9e67365faac/FLAGb20573099 [2020-07-21 19:43:38,925 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a32ed59e8/29e2ac2eb1b546ca9460f9e67365faac [2020-07-21 19:43:38,934 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:43:38,937 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:43:38,939 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:38,939 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:43:38,942 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:43:38,943 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:38" (1/1) ... [2020-07-21 19:43:38,946 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c580c07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:38, skipping insertion in model container [2020-07-21 19:43:38,947 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:38" (1/1) ... [2020-07-21 19:43:38,955 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:43:38,974 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:43:39,144 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:39,148 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:43:39,164 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:39,178 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:43:39,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39 WrapperNode [2020-07-21 19:43:39,179 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:39,180 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:43:39,180 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:43:39,180 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:43:39,190 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... [2020-07-21 19:43:39,191 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... [2020-07-21 19:43:39,195 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... [2020-07-21 19:43:39,195 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... [2020-07-21 19:43:39,198 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... [2020-07-21 19:43:39,201 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... [2020-07-21 19:43:39,202 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... [2020-07-21 19:43:39,203 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:43:39,204 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:43:39,204 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:43:39,204 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:43:39,205 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:39,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:43:39,362 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:43:39,362 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 19:43:39,362 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:43:39,362 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:43:39,362 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:43:39,363 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 19:43:39,363 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:43:39,363 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:43:39,363 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:43:39,536 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:43:39,536 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:43:39,540 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:39 BoogieIcfgContainer [2020-07-21 19:43:39,540 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:43:39,541 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:43:39,542 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:43:39,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:43:39,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:43:38" (1/3) ... [2020-07-21 19:43:39,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f63a3d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:39, skipping insertion in model container [2020-07-21 19:43:39,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:39" (2/3) ... [2020-07-21 19:43:39,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f63a3d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:39, skipping insertion in model container [2020-07-21 19:43:39,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:39" (3/3) ... [2020-07-21 19:43:39,550 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-1.c [2020-07-21 19:43:39,564 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:43:39,572 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:43:39,587 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:43:39,656 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:43:39,656 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:43:39,658 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:43:39,659 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:43:39,659 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:43:39,659 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:43:39,659 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:43:39,659 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:43:39,691 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:43:39,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:43:39,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:39,704 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:39,705 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:39,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:39,712 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 19:43:39,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:39,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435047737] [2020-07-21 19:43:39,722 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:39,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:39,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:39,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:39,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:39,890 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:39,890 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:39,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435047737] [2020-07-21 19:43:39,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:39,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:39,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180137728] [2020-07-21 19:43:39,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:39,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:39,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:39,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:39,911 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 19:43:40,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:40,026 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 19:43:40,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:40,029 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:43:40,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:40,041 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:43:40,042 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:43:40,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:43:40,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:43:40,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:43:40,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:43:40,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:43:40,092 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 19:43:40,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:40,093 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:43:40,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:40,093 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:43:40,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:43:40,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:40,096 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:40,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:40,311 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:40,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:40,312 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 19:43:40,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:40,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84156397] [2020-07-21 19:43:40,314 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:40,336 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:40,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:40,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:40,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:40,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:40,384 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:40,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84156397] [2020-07-21 19:43:40,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:40,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:40,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768441364] [2020-07-21 19:43:40,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:40,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:40,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:40,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:40,390 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 19:43:40,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:40,457 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 19:43:40,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:40,460 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:43:40,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:40,461 INFO L225 Difference]: With dead ends: 27 [2020-07-21 19:43:40,464 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:43:40,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:43:40,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:43:40,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 19:43:40,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:43:40,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:43:40,482 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 19:43:40,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:40,482 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:43:40,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:40,483 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:43:40,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:43:40,487 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:40,488 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:40,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:40,703 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:40,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:40,704 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 19:43:40,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:40,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204788548] [2020-07-21 19:43:40,705 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:40,738 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:40,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:40,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:40,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:40,790 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:43:40,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:40,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:41,008 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:43:41,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204788548] [2020-07-21 19:43:41,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:41,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:43:41,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638263846] [2020-07-21 19:43:41,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:43:41,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:41,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:43:41,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:41,011 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 19:43:41,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:41,124 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 19:43:41,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:43:41,125 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 19:43:41,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:41,127 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:43:41,127 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:43:41,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:41,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:43:41,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:43:41,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:43:41,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:43:41,138 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 19:43:41,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:41,139 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:43:41,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:43:41,139 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:43:41,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:43:41,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:41,141 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:41,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:41,355 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:41,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:41,356 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 19:43:41,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:41,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718810416] [2020-07-21 19:43:41,357 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:41,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:41,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:41,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:41,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:41,446 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:43:41,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:41,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:41,646 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:43:41,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718810416] [2020-07-21 19:43:41,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:41,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:43:41,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203833937] [2020-07-21 19:43:41,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:43:41,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:41,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:43:41,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:41,651 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 19:43:41,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:41,767 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 19:43:41,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:43:41,768 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:43:41,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:41,773 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:43:41,773 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:43:41,774 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 [2020-07-21 19:43:41,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:43:41,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 19:43:41,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:43:41,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:43:41,787 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 19:43:41,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:41,788 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:43:41,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:43:41,788 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:43:41,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:43:41,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:41,790 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:42,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:42,004 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:42,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:42,005 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 19:43:42,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:42,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903128380] [2020-07-21 19:43:42,006 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:42,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:42,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:42,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:42,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:42,096 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:43:42,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:42,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:42,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:42,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:42,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:42,426 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:43:42,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903128380] [2020-07-21 19:43:42,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:42,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:43:42,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008674307] [2020-07-21 19:43:42,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:43:42,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:42,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:43:42,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:42,430 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 19:43:42,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:42,593 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 19:43:42,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:42,594 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 19:43:42,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:42,597 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:43:42,597 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 19:43:42,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:42,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 19:43:42,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 19:43:42,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:43:42,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:43:42,609 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 19:43:42,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:42,609 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:43:42,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:43:42,610 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:43:42,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:43:42,612 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:42,612 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:42,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:42,815 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:42,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:42,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 19:43:42,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:42,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897651015] [2020-07-21 19:43:42,817 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:42,851 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:42,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:42,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:42,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:42,903 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 19:43:42,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:43,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,236 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:43:43,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897651015] [2020-07-21 19:43:43,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:43,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:43:43,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2536647] [2020-07-21 19:43:43,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:43:43,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:43,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:43:43,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:43,239 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 19:43:43,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:43,393 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 19:43:43,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:43,394 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:43:43,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:43,399 INFO L225 Difference]: With dead ends: 47 [2020-07-21 19:43:43,399 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 19:43:43,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:43,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 19:43:43,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 19:43:43,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:43:43,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:43:43,425 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 19:43:43,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:43,426 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:43:43,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:43:43,427 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:43:43,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 19:43:43,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:43,433 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:43,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:43,649 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:43,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:43,650 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 19:43:43,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:43,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584488881] [2020-07-21 19:43:43,652 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:43,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:43,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:43,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:43,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:43,777 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 19:43:43,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:44,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,385 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 19:43:44,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584488881] [2020-07-21 19:43:44,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:44,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:43:44,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44151047] [2020-07-21 19:43:44,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:43:44,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:44,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:43:44,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:43:44,388 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 19:43:44,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:44,583 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 19:43:44,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:44,583 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 19:43:44,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:44,586 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:43:44,586 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:43:44,587 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 [2020-07-21 19:43:44,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:43:44,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 19:43:44,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:43:44,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:43:44,599 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 19:43:44,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:44,599 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:43:44,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:43:44,600 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:43:44,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:43:44,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:44,603 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:44,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:44,818 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:44,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:44,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 19:43:44,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:44,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062788616] [2020-07-21 19:43:44,820 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:44,886 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:44,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:44,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:44,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:44,967 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 19:43:44,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:45,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:45,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:45,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:45,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:45,598 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 19:43:45,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062788616] [2020-07-21 19:43:45,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:45,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:43:45,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119689805] [2020-07-21 19:43:45,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:43:45,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:45,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:43:45,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:43:45,601 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 19:43:45,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:45,747 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 19:43:45,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:45,748 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 19:43:45,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:45,750 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:43:45,751 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:43:45,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:43:45,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:43:45,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 19:43:45,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:43:45,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:43:45,765 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 19:43:45,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:45,765 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:43:45,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:43:45,766 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:43:45,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 19:43:45,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:45,768 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:45,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:45,979 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:45,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:45,980 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 19:43:45,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:45,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926717450] [2020-07-21 19:43:45,982 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:46,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:46,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:46,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:46,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:46,137 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 19:43:46,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:46,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,218 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 19:43:47,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926717450] [2020-07-21 19:43:47,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:47,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:43:47,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808882909] [2020-07-21 19:43:47,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:43:47,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:47,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:43:47,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:43:47,221 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 19:43:47,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:47,528 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 19:43:47,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:47,529 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 19:43:47,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:47,531 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:43:47,532 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:43:47,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:43:47,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:43:47,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 19:43:47,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:43:47,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:43:47,546 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 19:43:47,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:47,547 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:43:47,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:43:47,547 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:43:47,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 19:43:47,550 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:47,551 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:47,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,766 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:47,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:47,767 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 19:43:47,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:47,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533452146] [2020-07-21 19:43:47,768 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:47,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:47,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:47,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:47,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 19:43:47,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:48,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 19:43:49,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533452146] [2020-07-21 19:43:49,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:49,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:43:49,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818421181] [2020-07-21 19:43:49,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:43:49,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:49,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:43:49,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:43:49,056 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 19:43:49,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:49,220 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 19:43:49,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:49,225 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 19:43:49,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:49,227 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:43:49,228 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 19:43:49,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:43:49,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 19:43:49,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 19:43:49,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:43:49,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:43:49,241 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 19:43:49,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:49,241 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:43:49,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:43:49,242 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:43:49,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:43:49,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:49,246 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:49,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:49,459 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:49,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:49,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 19:43:49,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:49,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761922940] [2020-07-21 19:43:49,461 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:49,583 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:49,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:49,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:49,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:49,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 19:43:49,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:50,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,640 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 19:43:51,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761922940] [2020-07-21 19:43:51,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:51,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:43:51,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135826958] [2020-07-21 19:43:51,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:43:51,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:51,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:43:51,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:43:51,646 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 19:43:51,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:51,855 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 19:43:51,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:43:51,856 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 19:43:51,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:51,861 INFO L225 Difference]: With dead ends: 72 [2020-07-21 19:43:51,861 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 19:43:51,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:43:51,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 19:43:51,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 19:43:51,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:43:51,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:43:51,887 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 19:43:51,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:51,888 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:43:51,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:43:51,888 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:43:51,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 19:43:51,896 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:51,896 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:52,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:52,111 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:52,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:52,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 19:43:52,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:52,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187107713] [2020-07-21 19:43:52,113 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:52,247 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:52,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:52,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:52,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:52,405 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 19:43:52,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:53,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 19:43:54,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187107713] [2020-07-21 19:43:54,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:54,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 19:43:54,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528985038] [2020-07-21 19:43:54,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:43:54,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:54,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:43:54,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:43:54,336 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 16 states. [2020-07-21 19:43:54,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:54,574 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 19:43:54,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:43:54,575 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 300 [2020-07-21 19:43:54,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:54,583 INFO L225 Difference]: With dead ends: 77 [2020-07-21 19:43:54,583 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:43:54,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:43:54,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:43:54,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 19:43:54,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:43:54,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:43:54,609 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 19:43:54,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:54,610 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:43:54,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:43:54,610 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:43:54,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-21 19:43:54,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:54,618 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 26, 25, 25, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:54,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:54,822 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:54,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:54,822 INFO L82 PathProgramCache]: Analyzing trace with hash -2028798950, now seen corresponding path program 6 times [2020-07-21 19:43:54,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:54,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477038562] [2020-07-21 19:43:54,823 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:54,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:54,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:54,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 755 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:43:54,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:55,145 INFO L134 CoverageAnalysis]: Checked inductivity of 6600 backedges. 256 proven. 1325 refuted. 0 times theorem prover too weak. 5019 trivial. 0 not checked. [2020-07-21 19:43:55,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:56,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,915 INFO L134 CoverageAnalysis]: Checked inductivity of 6600 backedges. 256 proven. 1376 refuted. 0 times theorem prover too weak. 4968 trivial. 0 not checked. [2020-07-21 19:43:57,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477038562] [2020-07-21 19:43:57,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:57,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:43:57,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143772817] [2020-07-21 19:43:57,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:43:57,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:57,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:43:57,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:57,917 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 18 states. [2020-07-21 19:43:58,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:58,191 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 19:43:58,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:43:58,192 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 338 [2020-07-21 19:43:58,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:58,195 INFO L225 Difference]: With dead ends: 82 [2020-07-21 19:43:58,195 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:43:58,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 645 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:43:58,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:43:58,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 19:43:58,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:43:58,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:43:58,215 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 338 [2020-07-21 19:43:58,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:58,216 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:43:58,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:43:58,216 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:43:58,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 19:43:58,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:58,221 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 52, 32, 32, 32, 32, 32, 32, 32, 20, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:58,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:58,436 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:58,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:58,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1773208677, now seen corresponding path program 6 times [2020-07-21 19:43:58,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:58,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436753207] [2020-07-21 19:43:58,438 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:58,647 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:58,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:58,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:43:58,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:58,823 INFO L134 CoverageAnalysis]: Checked inductivity of 11630 backedges. 648 proven. 1702 refuted. 0 times theorem prover too weak. 9280 trivial. 0 not checked. [2020-07-21 19:43:58,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:00,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:00,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:02,044 INFO L134 CoverageAnalysis]: Checked inductivity of 11630 backedges. 652 proven. 1749 refuted. 0 times theorem prover too weak. 9229 trivial. 0 not checked. [2020-07-21 19:44:02,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436753207] [2020-07-21 19:44:02,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:02,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:44:02,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383145352] [2020-07-21 19:44:02,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:02,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:02,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:02,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:02,049 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 18 states. [2020-07-21 19:44:02,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:02,371 INFO L93 Difference]: Finished difference Result 147 states and 749 transitions. [2020-07-21 19:44:02,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:02,372 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 449 [2020-07-21 19:44:02,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:02,375 INFO L225 Difference]: With dead ends: 147 [2020-07-21 19:44:02,375 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 19:44:02,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 904 GetRequests, 866 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:02,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 19:44:02,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 19:44:02,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 19:44:02,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 122 transitions. [2020-07-21 19:44:02,401 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 122 transitions. Word has length 449 [2020-07-21 19:44:02,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:02,403 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 122 transitions. [2020-07-21 19:44:02,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:02,404 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 122 transitions. [2020-07-21 19:44:02,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 19:44:02,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:02,408 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 36, 20, 20, 20, 20, 20, 20, 20, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:02,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:02,621 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:02,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:02,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1606827399, now seen corresponding path program 7 times [2020-07-21 19:44:02,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:02,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069830490] [2020-07-21 19:44:02,623 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:02,859 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:02,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:02,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:02,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:03,036 INFO L134 CoverageAnalysis]: Checked inductivity of 4670 backedges. 303 proven. 865 refuted. 0 times theorem prover too weak. 3502 trivial. 0 not checked. [2020-07-21 19:44:03,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:04,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,950 INFO L134 CoverageAnalysis]: Checked inductivity of 4670 backedges. 315 proven. 895 refuted. 0 times theorem prover too weak. 3460 trivial. 0 not checked. [2020-07-21 19:44:04,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069830490] [2020-07-21 19:44:04,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:04,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 19:44:04,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041147159] [2020-07-21 19:44:04,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:44:04,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:04,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:44:04,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:44:04,953 INFO L87 Difference]: Start difference. First operand 70 states and 122 transitions. Second operand 16 states. [2020-07-21 19:44:05,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:05,201 INFO L93 Difference]: Finished difference Result 165 states and 347 transitions. [2020-07-21 19:44:05,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:05,201 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 289 [2020-07-21 19:44:05,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:05,204 INFO L225 Difference]: With dead ends: 165 [2020-07-21 19:44:05,205 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:44:05,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 550 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:44:05,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:44:05,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 67. [2020-07-21 19:44:05,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 19:44:05,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 99 transitions. [2020-07-21 19:44:05,228 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 99 transitions. Word has length 289 [2020-07-21 19:44:05,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:05,229 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 99 transitions. [2020-07-21 19:44:05,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:44:05,229 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 99 transitions. [2020-07-21 19:44:05,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:44:05,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:05,233 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:05,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:05,447 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:05,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:05,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-21 19:44:05,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:05,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1456605200] [2020-07-21 19:44:05,449 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:05,643 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:05,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:05,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 167 conjunts are in the unsatisfiable core [2020-07-21 19:44:05,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:06,024 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-21 19:44:06,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:09,238 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-21 19:44:09,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1456605200] [2020-07-21 19:44:09,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:09,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-21 19:44:09,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474751814] [2020-07-21 19:44:09,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 19:44:09,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:09,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 19:44:09,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-21 19:44:09,242 INFO L87 Difference]: Start difference. First operand 67 states and 99 transitions. Second operand 28 states. [2020-07-21 19:44:09,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:09,680 INFO L93 Difference]: Finished difference Result 140 states and 257 transitions. [2020-07-21 19:44:09,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 19:44:09,681 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 286 [2020-07-21 19:44:09,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:09,685 INFO L225 Difference]: With dead ends: 140 [2020-07-21 19:44:09,685 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 19:44:09,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 573 GetRequests, 534 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=797, Unknown=0, NotChecked=0, Total=870 [2020-07-21 19:44:09,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 19:44:09,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 107. [2020-07-21 19:44:09,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 19:44:09,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 203 transitions. [2020-07-21 19:44:09,710 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 203 transitions. Word has length 286 [2020-07-21 19:44:09,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:09,710 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 203 transitions. [2020-07-21 19:44:09,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 19:44:09,711 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 203 transitions. [2020-07-21 19:44:09,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-21 19:44:09,716 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:09,717 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 36, 25, 25, 25, 25, 25, 25, 25, 15, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:09,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:09,930 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:09,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:09,931 INFO L82 PathProgramCache]: Analyzing trace with hash -710310728, now seen corresponding path program 9 times [2020-07-21 19:44:09,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:09,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629196152] [2020-07-21 19:44:09,932 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:10,149 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:10,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:10,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:10,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:10,352 INFO L134 CoverageAnalysis]: Checked inductivity of 6930 backedges. 464 proven. 1284 refuted. 0 times theorem prover too weak. 5182 trivial. 0 not checked. [2020-07-21 19:44:10,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:11,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6930 backedges. 470 proven. 1329 refuted. 0 times theorem prover too weak. 5131 trivial. 0 not checked. [2020-07-21 19:44:13,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629196152] [2020-07-21 19:44:13,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:13,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:44:13,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494244892] [2020-07-21 19:44:13,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:13,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:13,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:13,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:13,175 INFO L87 Difference]: Start difference. First operand 107 states and 203 transitions. Second operand 18 states. [2020-07-21 19:44:13,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:13,462 INFO L93 Difference]: Finished difference Result 227 states and 486 transitions. [2020-07-21 19:44:13,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:13,463 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 349 [2020-07-21 19:44:13,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:13,467 INFO L225 Difference]: With dead ends: 227 [2020-07-21 19:44:13,467 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 19:44:13,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 704 GetRequests, 666 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:13,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 19:44:13,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 101. [2020-07-21 19:44:13,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 19:44:13,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-21 19:44:13,501 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 349 [2020-07-21 19:44:13,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:13,502 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-21 19:44:13,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:13,502 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-21 19:44:13,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 19:44:13,508 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:13,509 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 34, 25, 25, 25, 25, 25, 25, 25, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:13,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:13,722 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:13,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:13,723 INFO L82 PathProgramCache]: Analyzing trace with hash 399875470, now seen corresponding path program 10 times [2020-07-21 19:44:13,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:13,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983043819] [2020-07-21 19:44:13,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:13,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:13,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:13,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:13,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:14,072 INFO L134 CoverageAnalysis]: Checked inductivity of 6861 backedges. 669 proven. 767 refuted. 0 times theorem prover too weak. 5425 trivial. 0 not checked. [2020-07-21 19:44:14,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:15,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:15,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:15,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:15,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:15,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:15,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:15,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:15,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,288 INFO L134 CoverageAnalysis]: Checked inductivity of 6861 backedges. 677 proven. 801 refuted. 0 times theorem prover too weak. 5383 trivial. 0 not checked. [2020-07-21 19:44:16,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983043819] [2020-07-21 19:44:16,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:16,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 19:44:16,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350640142] [2020-07-21 19:44:16,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:44:16,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:16,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:44:16,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:44:16,291 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 16 states. [2020-07-21 19:44:16,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:16,496 INFO L93 Difference]: Finished difference Result 137 states and 227 transitions. [2020-07-21 19:44:16,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:16,497 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 347 [2020-07-21 19:44:16,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:16,501 INFO L225 Difference]: With dead ends: 137 [2020-07-21 19:44:16,501 INFO L226 Difference]: Without dead ends: 125 [2020-07-21 19:44:16,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 666 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:44:16,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-21 19:44:16,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 114. [2020-07-21 19:44:16,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-07-21 19:44:16,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 196 transitions. [2020-07-21 19:44:16,521 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 196 transitions. Word has length 347 [2020-07-21 19:44:16,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:16,522 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 196 transitions. [2020-07-21 19:44:16,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:44:16,522 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 196 transitions. [2020-07-21 19:44:16,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 19:44:16,528 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:16,528 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 33, 22, 22, 22, 22, 22, 22, 22, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:16,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:16,743 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:16,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:16,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1638198847, now seen corresponding path program 11 times [2020-07-21 19:44:16,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:16,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [809499224] [2020-07-21 19:44:16,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:16,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:16,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:16,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:44:16,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:17,107 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 531 proven. 605 refuted. 0 times theorem prover too weak. 4276 trivial. 0 not checked. [2020-07-21 19:44:17,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:18,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:18,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 533 proven. 627 refuted. 0 times theorem prover too weak. 4252 trivial. 0 not checked. [2020-07-21 19:44:18,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [809499224] [2020-07-21 19:44:18,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:18,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 19:44:18,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183283806] [2020-07-21 19:44:18,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:44:18,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:18,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:44:18,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:44:18,758 INFO L87 Difference]: Start difference. First operand 114 states and 196 transitions. Second operand 16 states. [2020-07-21 19:44:18,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:18,942 INFO L93 Difference]: Finished difference Result 174 states and 289 transitions. [2020-07-21 19:44:18,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:18,943 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 310 [2020-07-21 19:44:18,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:18,948 INFO L225 Difference]: With dead ends: 174 [2020-07-21 19:44:18,948 INFO L226 Difference]: Without dead ends: 157 [2020-07-21 19:44:18,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 624 GetRequests, 594 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:44:18,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-07-21 19:44:18,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 125. [2020-07-21 19:44:18,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-21 19:44:18,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 214 transitions. [2020-07-21 19:44:18,977 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 214 transitions. Word has length 310 [2020-07-21 19:44:18,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:18,978 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 214 transitions. [2020-07-21 19:44:18,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:44:18,978 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 214 transitions. [2020-07-21 19:44:19,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 19:44:19,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:19,015 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 33, 23, 23, 23, 23, 23, 23, 23, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:19,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:19,225 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:19,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:19,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1301108288, now seen corresponding path program 12 times [2020-07-21 19:44:19,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:19,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292111292] [2020-07-21 19:44:19,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:19,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:19,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:19,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 19:44:19,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:19,597 INFO L134 CoverageAnalysis]: Checked inductivity of 5864 backedges. 379 proven. 1014 refuted. 0 times theorem prover too weak. 4471 trivial. 0 not checked. [2020-07-21 19:44:19,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:20,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,884 INFO L134 CoverageAnalysis]: Checked inductivity of 5864 backedges. 380 proven. 1048 refuted. 0 times theorem prover too weak. 4436 trivial. 0 not checked. [2020-07-21 19:44:21,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292111292] [2020-07-21 19:44:21,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:21,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 19:44:21,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294674140] [2020-07-21 19:44:21,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:21,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:21,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:21,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:21,887 INFO L87 Difference]: Start difference. First operand 125 states and 214 transitions. Second operand 18 states. [2020-07-21 19:44:22,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:22,158 INFO L93 Difference]: Finished difference Result 215 states and 381 transitions. [2020-07-21 19:44:22,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:22,159 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 322 [2020-07-21 19:44:22,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:22,162 INFO L225 Difference]: With dead ends: 215 [2020-07-21 19:44:22,162 INFO L226 Difference]: Without dead ends: 125 [2020-07-21 19:44:22,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 614 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:44:22,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-21 19:44:22,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2020-07-21 19:44:22,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-21 19:44:22,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 199 transitions. [2020-07-21 19:44:22,190 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 199 transitions. Word has length 322 [2020-07-21 19:44:22,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:22,190 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 199 transitions. [2020-07-21 19:44:22,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:22,190 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 199 transitions. [2020-07-21 19:44:22,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 19:44:22,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:22,198 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 33, 22, 22, 22, 22, 22, 22, 22, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:22,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:22,414 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:22,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:22,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1885637449, now seen corresponding path program 13 times [2020-07-21 19:44:22,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:22,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318352129] [2020-07-21 19:44:22,415 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:22,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:22,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:22,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:44:22,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:22,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 424 proven. 712 refuted. 0 times theorem prover too weak. 4276 trivial. 0 not checked. [2020-07-21 19:44:22,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:23,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 428 proven. 732 refuted. 0 times theorem prover too weak. 4252 trivial. 0 not checked. [2020-07-21 19:44:24,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318352129] [2020-07-21 19:44:24,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:24,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 19:44:24,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993649940] [2020-07-21 19:44:24,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:44:24,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:24,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:44:24,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:44:24,514 INFO L87 Difference]: Start difference. First operand 125 states and 199 transitions. Second operand 16 states. [2020-07-21 19:44:24,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:24,693 INFO L93 Difference]: Finished difference Result 157 states and 249 transitions. [2020-07-21 19:44:24,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:24,694 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 310 [2020-07-21 19:44:24,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:24,697 INFO L225 Difference]: With dead ends: 157 [2020-07-21 19:44:24,697 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 19:44:24,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 624 GetRequests, 594 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:44:24,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 19:44:24,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 122. [2020-07-21 19:44:24,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-21 19:44:24,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 194 transitions. [2020-07-21 19:44:24,717 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 194 transitions. Word has length 310 [2020-07-21 19:44:24,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:24,718 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 194 transitions. [2020-07-21 19:44:24,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:44:24,718 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 194 transitions. [2020-07-21 19:44:24,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 19:44:24,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:24,725 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:24,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:24,938 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:24,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:24,938 INFO L82 PathProgramCache]: Analyzing trace with hash -994777342, now seen corresponding path program 14 times [2020-07-21 19:44:24,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:24,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896256517] [2020-07-21 19:44:24,939 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:25,195 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:25,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:25,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:25,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:25,316 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 921 proven. 291 refuted. 0 times theorem prover too weak. 3801 trivial. 0 not checked. [2020-07-21 19:44:25,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:26,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:27,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 927 proven. 327 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 19:44:27,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896256517] [2020-07-21 19:44:27,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:27,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 19:44:27,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011033328] [2020-07-21 19:44:27,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:44:27,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:27,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:44:27,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:44:27,233 INFO L87 Difference]: Start difference. First operand 122 states and 194 transitions. Second operand 16 states. [2020-07-21 19:44:27,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:27,439 INFO L93 Difference]: Finished difference Result 166 states and 261 transitions. [2020-07-21 19:44:27,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:27,439 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 299 [2020-07-21 19:44:27,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:27,443 INFO L225 Difference]: With dead ends: 166 [2020-07-21 19:44:27,444 INFO L226 Difference]: Without dead ends: 159 [2020-07-21 19:44:27,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:44:27,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2020-07-21 19:44:27,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 135. [2020-07-21 19:44:27,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2020-07-21 19:44:27,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 217 transitions. [2020-07-21 19:44:27,467 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 217 transitions. Word has length 299 [2020-07-21 19:44:27,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:27,467 INFO L479 AbstractCegarLoop]: Abstraction has 135 states and 217 transitions. [2020-07-21 19:44:27,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:44:27,468 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 217 transitions. [2020-07-21 19:44:27,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 19:44:27,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:27,475 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 33, 22, 22, 22, 22, 22, 22, 22, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:27,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:27,690 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:27,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:27,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1565266763, now seen corresponding path program 15 times [2020-07-21 19:44:27,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:27,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1078711131] [2020-07-21 19:44:27,691 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:27,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:27,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:27,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:44:27,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:28,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 861 proven. 275 refuted. 0 times theorem prover too weak. 4276 trivial. 0 not checked. [2020-07-21 19:44:28,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:28,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 861 proven. 299 refuted. 0 times theorem prover too weak. 4252 trivial. 0 not checked. [2020-07-21 19:44:29,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1078711131] [2020-07-21 19:44:29,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:29,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 19:44:29,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221980401] [2020-07-21 19:44:29,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:44:29,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:29,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:44:29,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:44:29,899 INFO L87 Difference]: Start difference. First operand 135 states and 217 transitions. Second operand 16 states. [2020-07-21 19:44:30,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:30,076 INFO L93 Difference]: Finished difference Result 194 states and 316 transitions. [2020-07-21 19:44:30,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:30,077 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 310 [2020-07-21 19:44:30,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:30,081 INFO L225 Difference]: With dead ends: 194 [2020-07-21 19:44:30,082 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 19:44:30,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 624 GetRequests, 594 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:44:30,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 19:44:30,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 132. [2020-07-21 19:44:30,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-21 19:44:30,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 216 transitions. [2020-07-21 19:44:30,107 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 216 transitions. Word has length 310 [2020-07-21 19:44:30,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:30,108 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 216 transitions. [2020-07-21 19:44:30,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:44:30,108 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 216 transitions. [2020-07-21 19:44:30,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 19:44:30,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:30,121 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:30,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:30,336 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:30,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:30,336 INFO L82 PathProgramCache]: Analyzing trace with hash -1448945942, now seen corresponding path program 16 times [2020-07-21 19:44:30,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:30,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460085693] [2020-07-21 19:44:30,337 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:30,638 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:30,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:30,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 19:44:30,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:30,753 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 960 proven. 313 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 19:44:30,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:31,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,047 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 955 proven. 353 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 19:44:33,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460085693] [2020-07-21 19:44:33,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:33,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 19:44:33,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808787999] [2020-07-21 19:44:33,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:33,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:33,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:33,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:33,053 INFO L87 Difference]: Start difference. First operand 132 states and 216 transitions. Second operand 18 states. [2020-07-21 19:44:33,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:33,333 INFO L93 Difference]: Finished difference Result 239 states and 383 transitions. [2020-07-21 19:44:33,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:33,334 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 19:44:33,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:33,339 INFO L225 Difference]: With dead ends: 239 [2020-07-21 19:44:33,339 INFO L226 Difference]: Without dead ends: 217 [2020-07-21 19:44:33,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:44:33,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-07-21 19:44:33,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 124. [2020-07-21 19:44:33,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 19:44:33,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 204 transitions. [2020-07-21 19:44:33,364 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 204 transitions. Word has length 298 [2020-07-21 19:44:33,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:33,365 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 204 transitions. [2020-07-21 19:44:33,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:33,365 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 204 transitions. [2020-07-21 19:44:33,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 19:44:33,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:33,373 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:33,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:33,586 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:33,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:33,588 INFO L82 PathProgramCache]: Analyzing trace with hash -606289430, now seen corresponding path program 17 times [2020-07-21 19:44:33,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:33,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332813160] [2020-07-21 19:44:33,588 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:33,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:33,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:33,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 19:44:33,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:34,001 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 614 proven. 659 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 19:44:34,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:35,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:35,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:35,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:35,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:35,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:35,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 611 proven. 697 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 19:44:36,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332813160] [2020-07-21 19:44:36,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:36,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 19:44:36,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970500377] [2020-07-21 19:44:36,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:36,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:36,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:36,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:36,285 INFO L87 Difference]: Start difference. First operand 124 states and 204 transitions. Second operand 18 states. [2020-07-21 19:44:36,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:36,540 INFO L93 Difference]: Finished difference Result 158 states and 246 transitions. [2020-07-21 19:44:36,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:36,540 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 19:44:36,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:36,543 INFO L225 Difference]: With dead ends: 158 [2020-07-21 19:44:36,543 INFO L226 Difference]: Without dead ends: 141 [2020-07-21 19:44:36,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:44:36,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-07-21 19:44:36,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 101. [2020-07-21 19:44:36,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 19:44:36,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 164 transitions. [2020-07-21 19:44:36,558 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 164 transitions. Word has length 298 [2020-07-21 19:44:36,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:36,558 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 164 transitions. [2020-07-21 19:44:36,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:36,559 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 164 transitions. [2020-07-21 19:44:36,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 19:44:36,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:36,563 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:36,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:36,779 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:36,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:36,780 INFO L82 PathProgramCache]: Analyzing trace with hash 264460084, now seen corresponding path program 18 times [2020-07-21 19:44:36,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:36,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946689952] [2020-07-21 19:44:36,781 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:37,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:37,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:37,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 19:44:37,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:37,202 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 441 proven. 832 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 19:44:37,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:38,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:38,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:38,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,518 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 440 proven. 868 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 19:44:39,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946689952] [2020-07-21 19:44:39,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:39,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 19:44:39,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663661571] [2020-07-21 19:44:39,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:39,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:39,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:39,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:39,520 INFO L87 Difference]: Start difference. First operand 101 states and 164 transitions. Second operand 18 states. [2020-07-21 19:44:39,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:39,744 INFO L93 Difference]: Finished difference Result 127 states and 191 transitions. [2020-07-21 19:44:39,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:39,745 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 19:44:39,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:39,749 INFO L225 Difference]: With dead ends: 127 [2020-07-21 19:44:39,749 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 19:44:39,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:44:39,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 19:44:39,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 81. [2020-07-21 19:44:39,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 19:44:39,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 125 transitions. [2020-07-21 19:44:39,760 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 125 transitions. Word has length 298 [2020-07-21 19:44:39,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:39,761 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 125 transitions. [2020-07-21 19:44:39,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:39,761 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 125 transitions. [2020-07-21 19:44:39,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 19:44:39,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:39,764 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 20, 20, 20, 20, 20, 20, 20, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:39,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:39,979 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:39,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:39,980 INFO L82 PathProgramCache]: Analyzing trace with hash -258866501, now seen corresponding path program 19 times [2020-07-21 19:44:39,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:39,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572264999] [2020-07-21 19:44:39,981 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:40,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:40,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:40,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:40,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:40,427 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 270 proven. 1056 refuted. 0 times theorem prover too weak. 3275 trivial. 0 not checked. [2020-07-21 19:44:40,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:41,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:41,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:42,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:42,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:42,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:42,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:42,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:42,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:43,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:43,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:43,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:43,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 280 proven. 1103 refuted. 0 times theorem prover too weak. 3218 trivial. 0 not checked. [2020-07-21 19:44:43,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572264999] [2020-07-21 19:44:43,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:43,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:44:43,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977935232] [2020-07-21 19:44:43,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:43,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:43,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:43,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:43,086 INFO L87 Difference]: Start difference. First operand 81 states and 125 transitions. Second operand 18 states. [2020-07-21 19:44:43,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:43,373 INFO L93 Difference]: Finished difference Result 180 states and 281 transitions. [2020-07-21 19:44:43,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:43,374 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 287 [2020-07-21 19:44:43,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:43,377 INFO L225 Difference]: With dead ends: 180 [2020-07-21 19:44:43,377 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:44:43,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 542 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:43,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:44:43,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2020-07-21 19:44:43,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 19:44:43,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 96 transitions. [2020-07-21 19:44:43,389 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 96 transitions. Word has length 287 [2020-07-21 19:44:43,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:43,389 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 96 transitions. [2020-07-21 19:44:43,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:43,389 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 96 transitions. [2020-07-21 19:44:43,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 19:44:43,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:43,393 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:43,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:43,607 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:43,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:43,608 INFO L82 PathProgramCache]: Analyzing trace with hash -551621334, now seen corresponding path program 20 times [2020-07-21 19:44:43,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:43,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054945574] [2020-07-21 19:44:43,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:43,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:43,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:43,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 19:44:43,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:44,068 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 321 proven. 952 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 19:44:44,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:45,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:45,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:45,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:46,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:46,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:46,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:46,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:46,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:46,405 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 324 proven. 984 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 19:44:46,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054945574] [2020-07-21 19:44:46,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:46,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 19:44:46,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462313835] [2020-07-21 19:44:46,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:46,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:46,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:46,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:46,407 INFO L87 Difference]: Start difference. First operand 78 states and 96 transitions. Second operand 18 states. [2020-07-21 19:44:46,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:46,661 INFO L93 Difference]: Finished difference Result 105 states and 126 transitions. [2020-07-21 19:44:46,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:46,662 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 19:44:46,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:46,664 INFO L225 Difference]: With dead ends: 105 [2020-07-21 19:44:46,666 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:44:46,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:44:46,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:44:46,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-07-21 19:44:46,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 19:44:46,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 85 transitions. [2020-07-21 19:44:46,675 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 85 transitions. Word has length 298 [2020-07-21 19:44:46,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:46,675 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 85 transitions. [2020-07-21 19:44:46,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:46,676 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 85 transitions. [2020-07-21 19:44:46,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 19:44:46,678 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:46,679 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:46,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:46,892 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:46,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:46,893 INFO L82 PathProgramCache]: Analyzing trace with hash -2133540566, now seen corresponding path program 21 times [2020-07-21 19:44:46,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:46,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190607294] [2020-07-21 19:44:46,894 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:47,216 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:47,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:47,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 19:44:47,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:47,395 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 328 proven. 1119 refuted. 0 times theorem prover too weak. 3533 trivial. 0 not checked. [2020-07-21 19:44:47,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:49,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,705 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 322 proven. 1176 refuted. 0 times theorem prover too weak. 3482 trivial. 0 not checked. [2020-07-21 19:44:50,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190607294] [2020-07-21 19:44:50,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:50,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 18] total 20 [2020-07-21 19:44:50,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497969654] [2020-07-21 19:44:50,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 19:44:50,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:50,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 19:44:50,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:44:50,707 INFO L87 Difference]: Start difference. First operand 73 states and 85 transitions. Second operand 20 states. [2020-07-21 19:44:51,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:51,008 INFO L93 Difference]: Finished difference Result 138 states and 164 transitions. [2020-07-21 19:44:51,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:44:51,009 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 298 [2020-07-21 19:44:51,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:51,011 INFO L225 Difference]: With dead ends: 138 [2020-07-21 19:44:51,011 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:44:51,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 562 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:44:51,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:44:51,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:44:51,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:44:51,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:44:51,020 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 298 [2020-07-21 19:44:51,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:51,021 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:44:51,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 19:44:51,021 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:44:51,021 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:44:51,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:51,236 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:44:53,538 WARN L193 SmtUtils]: Spent 2.22 s on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:44:53,744 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:44:54,678 WARN L193 SmtUtils]: Spent 932.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:44:55,557 WARN L193 SmtUtils]: Spent 876.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:44:55,690 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:44:56,557 WARN L193 SmtUtils]: Spent 865.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 138 [2020-07-21 19:44:57,413 WARN L193 SmtUtils]: Spent 853.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:44:58,051 WARN L193 SmtUtils]: Spent 635.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 134 [2020-07-21 19:44:58,816 WARN L193 SmtUtils]: Spent 764.00 ms on a formula simplification. DAG size of input: 336 DAG size of output: 138 [2020-07-21 19:44:58,953 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:44:59,770 WARN L193 SmtUtils]: Spent 815.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:00,596 WARN L193 SmtUtils]: Spent 824.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:00,712 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:01,333 WARN L193 SmtUtils]: Spent 620.00 ms on a formula simplification. DAG size of input: 309 DAG size of output: 139 [2020-07-21 19:45:02,207 WARN L193 SmtUtils]: Spent 871.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:03,066 WARN L193 SmtUtils]: Spent 857.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:03,197 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:04,154 WARN L193 SmtUtils]: Spent 955.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:04,977 WARN L193 SmtUtils]: Spent 820.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 138 [2020-07-21 19:45:05,099 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:06,037 WARN L193 SmtUtils]: Spent 935.00 ms on a formula simplification. DAG size of input: 351 DAG size of output: 139 [2020-07-21 19:45:06,806 WARN L193 SmtUtils]: Spent 768.00 ms on a formula simplification. DAG size of input: 336 DAG size of output: 138 [2020-07-21 19:45:06,920 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:07,808 WARN L193 SmtUtils]: Spent 886.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:08,057 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 92 [2020-07-21 19:45:08,308 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 92 [2020-07-21 19:45:09,132 WARN L193 SmtUtils]: Spent 822.00 ms on a formula simplification. DAG size of input: 336 DAG size of output: 138 [2020-07-21 19:45:09,788 WARN L193 SmtUtils]: Spent 654.00 ms on a formula simplification. DAG size of input: 315 DAG size of output: 135 [2020-07-21 19:45:10,663 WARN L193 SmtUtils]: Spent 873.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:11,419 WARN L193 SmtUtils]: Spent 754.00 ms on a formula simplification. DAG size of input: 341 DAG size of output: 138 [2020-07-21 19:45:12,303 WARN L193 SmtUtils]: Spent 882.00 ms on a formula simplification. DAG size of input: 351 DAG size of output: 139 [2020-07-21 19:45:12,418 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:13,150 WARN L193 SmtUtils]: Spent 730.00 ms on a formula simplification. DAG size of input: 334 DAG size of output: 138 [2020-07-21 19:45:14,013 WARN L193 SmtUtils]: Spent 861.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:14,688 WARN L193 SmtUtils]: Spent 672.00 ms on a formula simplification. DAG size of input: 319 DAG size of output: 138 [2020-07-21 19:45:14,807 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:15,638 WARN L193 SmtUtils]: Spent 829.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 139 [2020-07-21 19:45:16,484 WARN L193 SmtUtils]: Spent 843.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:17,268 WARN L193 SmtUtils]: Spent 783.00 ms on a formula simplification. DAG size of input: 334 DAG size of output: 138 [2020-07-21 19:45:17,392 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:18,225 WARN L193 SmtUtils]: Spent 832.00 ms on a formula simplification. DAG size of input: 351 DAG size of output: 139 [2020-07-21 19:45:18,471 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 92 [2020-07-21 19:45:19,299 WARN L193 SmtUtils]: Spent 826.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 143 [2020-07-21 19:45:20,093 WARN L193 SmtUtils]: Spent 791.00 ms on a formula simplification. DAG size of input: 343 DAG size of output: 143 [2020-07-21 19:45:20,353 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 92 [2020-07-21 19:45:20,462 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 64 [2020-07-21 19:45:21,305 WARN L193 SmtUtils]: Spent 841.00 ms on a formula simplification. DAG size of input: 351 DAG size of output: 139 [2020-07-21 19:45:22,122 WARN L193 SmtUtils]: Spent 814.00 ms on a formula simplification. DAG size of input: 349 DAG size of output: 139 [2020-07-21 19:45:22,237 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 64 [2020-07-21 19:45:23,087 WARN L193 SmtUtils]: Spent 848.00 ms on a formula simplification. DAG size of input: 349 DAG size of output: 139 [2020-07-21 19:45:23,198 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 64 [2020-07-21 19:45:23,443 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 247 DAG size of output: 93 [2020-07-21 19:45:23,748 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 92 [2020-07-21 19:45:24,610 WARN L193 SmtUtils]: Spent 860.00 ms on a formula simplification. DAG size of input: 353 DAG size of output: 144 [2020-07-21 19:45:24,726 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 64 [2020-07-21 19:45:24,986 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 92 [2020-07-21 19:45:25,107 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 67 [2020-07-21 19:45:25,354 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 92 [2020-07-21 19:45:25,678 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 97 [2020-07-21 19:45:25,898 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 67 [2020-07-21 19:45:26,147 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 92 [2020-07-21 19:45:26,458 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 226 DAG size of output: 88 [2020-07-21 19:45:26,779 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 226 DAG size of output: 88 [2020-07-21 19:45:27,029 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 92 [2020-07-21 19:45:27,544 WARN L193 SmtUtils]: Spent 513.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 128 [2020-07-21 19:45:27,965 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 92 [2020-07-21 19:45:28,462 WARN L193 SmtUtils]: Spent 495.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 128 [2020-07-21 19:45:29,243 WARN L193 SmtUtils]: Spent 779.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:29,750 WARN L193 SmtUtils]: Spent 505.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 128 [2020-07-21 19:45:30,029 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 91 [2020-07-21 19:45:30,961 WARN L193 SmtUtils]: Spent 821.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:31,247 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 91 [2020-07-21 19:45:32,213 WARN L193 SmtUtils]: Spent 793.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:32,942 WARN L193 SmtUtils]: Spent 728.00 ms on a formula simplification. DAG size of input: 359 DAG size of output: 66 [2020-07-21 19:45:33,260 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 95 [2020-07-21 19:45:33,386 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:33,511 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:34,331 WARN L193 SmtUtils]: Spent 818.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:34,711 WARN L193 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 310 DAG size of output: 125 [2020-07-21 19:45:34,997 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 74 [2020-07-21 19:45:35,880 WARN L193 SmtUtils]: Spent 881.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:36,820 WARN L193 SmtUtils]: Spent 870.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:37,615 WARN L193 SmtUtils]: Spent 792.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:38,507 WARN L193 SmtUtils]: Spent 848.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:38,626 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 66 [2020-07-21 19:45:39,449 WARN L193 SmtUtils]: Spent 821.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:40,315 WARN L193 SmtUtils]: Spent 864.00 ms on a formula simplification. DAG size of input: 354 DAG size of output: 139 [2020-07-21 19:45:41,143 WARN L193 SmtUtils]: Spent 826.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 138 [2020-07-21 19:45:44,692 WARN L193 SmtUtils]: Spent 3.35 s on a formula simplification. DAG size of input: 286 DAG size of output: 40 [2020-07-21 19:45:44,731 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:45:44,731 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:45:44,731 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:45:44,731 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:45:44,732 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:45:44,732 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:45:44,732 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 19:45:44,732 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 19:45:44,732 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 19:45:44,732 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 19:45:44,732 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= 7 main_~x~0) (<= main_~x~0 7)) [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse1 (<= fibo_~n |fibo_#in~n|)) (.cse2 (<= |fibo_#in~n| fibo_~n))) (let ((.cse3 (and .cse1 .cse2 (= 5 |fibo_#t~ret0|) (<= 6 |fibo_#in~n|))) (.cse4 (and .cse1 .cse2 (<= 7 |fibo_#in~n|)))) (and (let ((.cse0 (= |fibo_#t~ret0| 1))) (or (and .cse0 .cse1 .cse2 (<= 3 |fibo_#in~n|) (<= |fibo_#in~n| 3)) (and (<= 5 |fibo_#in~n|) .cse1 .cse2 (<= |fibo_#in~n| 5)) .cse3 .cse4 (and (<= 4 |fibo_#in~n|) .cse1 (= |fibo_#t~ret0| 2) .cse2) (and .cse0 .cse1 (<= |fibo_#in~n| 2) .cse2 (<= 2 |fibo_#in~n|)))) (or (<= |fibo_#in~n| 6) (<= 8 |fibo_#in~n|) (= |fibo_#t~ret0| 8)) (or .cse3 (<= |fibo_#in~n| 4) .cse4 (= |fibo_#t~ret0| 3))))) [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 19:45:44,733 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 19:45:44,734 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 19:45:44,734 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 19:45:44,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:45:44 BoogieIcfgContainer [2020-07-21 19:45:44,740 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:45:44,742 INFO L168 Benchmark]: Toolchain (without parser) took 125805.90 ms. Allocated memory was 136.3 MB in the beginning and 1.6 GB in the end (delta: 1.5 GB). Free memory was 101.2 MB in the beginning and 969.3 MB in the end (delta: -868.1 MB). Peak memory consumption was 1.5 GB. Max. memory is 7.1 GB. [2020-07-21 19:45:44,742 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 136.3 MB. Free memory is still 119.0 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 19:45:44,743 INFO L168 Benchmark]: CACSL2BoogieTranslator took 241.10 ms. Allocated memory is still 136.3 MB. Free memory was 100.8 MB in the beginning and 91.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:45:44,743 INFO L168 Benchmark]: Boogie Preprocessor took 23.31 ms. Allocated memory is still 136.3 MB. Free memory was 91.3 MB in the beginning and 90.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:45:44,743 INFO L168 Benchmark]: RCFGBuilder took 336.78 ms. Allocated memory was 136.3 MB in the beginning and 201.3 MB in the end (delta: 65.0 MB). Free memory was 90.0 MB in the beginning and 168.8 MB in the end (delta: -78.8 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:45:44,744 INFO L168 Benchmark]: TraceAbstraction took 125198.56 ms. Allocated memory was 201.3 MB in the beginning and 1.6 GB in the end (delta: 1.4 GB). Free memory was 168.8 MB in the beginning and 969.3 MB in the end (delta: -800.5 MB). Peak memory consumption was 1.5 GB. Max. memory is 7.1 GB. [2020-07-21 19:45:44,746 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 136.3 MB. Free memory is still 119.0 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 241.10 ms. Allocated memory is still 136.3 MB. Free memory was 100.8 MB in the beginning and 91.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.31 ms. Allocated memory is still 136.3 MB. Free memory was 91.3 MB in the beginning and 90.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 336.78 ms. Allocated memory was 136.3 MB in the beginning and 201.3 MB in the end (delta: 65.0 MB). Free memory was 90.0 MB in the beginning and 168.8 MB in the end (delta: -78.8 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 125198.56 ms. Allocated memory was 201.3 MB in the beginning and 1.6 GB in the end (delta: 1.4 GB). Free memory was 168.8 MB in the beginning and 969.3 MB in the end (delta: -800.5 MB). Peak memory consumption was 1.5 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 71.5s, OverallIterations: 29, TraceHistogramMax: 65, AutomataDifference: 6.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 53.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 762 SDtfs, 843 SDslu, 3410 SDs, 0 SdLazy, 3997 SolverSat, 1064 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13297 GetRequests, 12464 SyntacticMatches, 304 SemanticMatches, 529 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2441 ImplicationChecksByTransitivity, 7.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=135occurred in iteration=22, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 29 MinimizatonAttempts, 519 StatesRemovedByMinimization, 23 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 341 PreInvPairs, 14278 NumberOfFragments, 145 HoareAnnotationTreeSize, 341 FomulaSimplifications, 6547470753 FormulaSimplificationTreeSizeReduction, 50.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 1387803 FormulaSimplificationTreeSizeReductionInter, 3.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.7s SatisfiabilityAnalysisTime, 52.7s InterpolantComputationTime, 6600 NumberOfCodeBlocks, 6587 NumberOfCodeBlocksAsserted, 56 NumberOfCheckSat, 13117 ConstructedInterpolants, 0 QuantifiedInterpolants, 5770942 SizeOfPredicates, 168 NumberOfNonLiveVariables, 14677 ConjunctsInSsa, 512 ConjunctsInUnsatCore, 56 InterpolantComputations, 2 PerfectInterpolantSequences, 184366/221826 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...