/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:47:46,451 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:47:46,456 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:47:46,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:47:46,480 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:47:46,483 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:47:46,485 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:47:46,497 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:47:46,502 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:47:46,503 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:47:46,505 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:47:46,508 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:47:46,508 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:47:46,512 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:47:46,515 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:47:46,517 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:47:46,520 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:47:46,522 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:47:46,524 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:47:46,530 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:47:46,536 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:47:46,541 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:47:46,543 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:47:46,544 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:47:46,548 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:47:46,560 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:47:46,561 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:47:46,563 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:47:46,564 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:47:46,603 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:47:46,603 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:47:46,605 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:47:46,605 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:47:46,606 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:47:46,606 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:47:46,606 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:47:46,610 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:47:46,611 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:47:46,611 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:47:46,611 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:47:46,611 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:47:46,611 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:47:46,612 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:47:46,612 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:47:46,612 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:47:46,612 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:47:46,612 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:47:46,613 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:47:46,613 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:47:46,613 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:47:46,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:47:46,616 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:47:46,617 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:47:46,617 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:47:46,617 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:47:46,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:46,617 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:47:46,618 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:47:46,618 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:47:46,971 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:47:46,989 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:47:46,993 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:47:46,995 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:47:46,996 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:47:46,997 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c [2020-07-20 16:47:47,081 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94892dcd6/8498fce77c8d49d4b7884cf5fd25454b/FLAGa021e4154 [2020-07-20 16:47:47,644 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:47:47,645 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c [2020-07-20 16:47:47,657 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94892dcd6/8498fce77c8d49d4b7884cf5fd25454b/FLAGa021e4154 [2020-07-20 16:47:47,948 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94892dcd6/8498fce77c8d49d4b7884cf5fd25454b [2020-07-20 16:47:47,964 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:47:47,969 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:47:47,976 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:47:47,976 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:47:47,981 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:47:47,983 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:47:47" (1/1) ... [2020-07-20 16:47:47,987 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53b756ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:47, skipping insertion in model container [2020-07-20 16:47:47,988 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:47:47" (1/1) ... [2020-07-20 16:47:48,001 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:47:48,031 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:47:48,333 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:47:48,345 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:47:48,363 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:47:48,378 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:47:48,378 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48 WrapperNode [2020-07-20 16:47:48,378 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:47:48,379 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:47:48,379 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:47:48,379 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:47:48,392 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... [2020-07-20 16:47:48,392 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... [2020-07-20 16:47:48,488 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... [2020-07-20 16:47:48,489 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... [2020-07-20 16:47:48,493 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... [2020-07-20 16:47:48,496 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... [2020-07-20 16:47:48,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... [2020-07-20 16:47:48,512 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:47:48,513 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:47:48,513 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:47:48,513 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:47:48,515 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:47:48,590 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:47:48,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:47:48,591 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:47:48,591 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:47:48,591 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:47:48,591 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:47:48,592 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:47:48,592 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:47:48,592 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:47:48,592 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:47:48,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:47:48,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:47:48,813 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:47:48,813 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:47:48,818 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:47:48 BoogieIcfgContainer [2020-07-20 16:47:48,819 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:47:48,820 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:47:48,820 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:47:48,824 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:47:48,825 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:47:47" (1/3) ... [2020-07-20 16:47:48,826 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6189deaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:47:48, skipping insertion in model container [2020-07-20 16:47:48,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:47:48" (2/3) ... [2020-07-20 16:47:48,827 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6189deaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:47:48, skipping insertion in model container [2020-07-20 16:47:48,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:47:48" (3/3) ... [2020-07-20 16:47:48,829 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_25-2.c [2020-07-20 16:47:48,844 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:47:48,854 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:47:48,872 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:47:48,924 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:47:48,925 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:47:48,925 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:47:48,925 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:47:48,925 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:47:48,926 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:47:48,928 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:47:48,929 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:47:48,996 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:47:49,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:47:49,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:49,019 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:49,019 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:49,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:49,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:47:49,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:49,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024190029] [2020-07-20 16:47:49,048 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:49,142 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:49,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:49,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:47:49,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:49,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:47:49,264 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:47:49,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024190029] [2020-07-20 16:47:49,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:47:49,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:47:49,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606345772] [2020-07-20 16:47:49,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:47:49,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:49,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:47:49,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:47:49,291 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:47:49,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:49,438 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:47:49,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:47:49,441 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:47:49,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:49,455 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:47:49,455 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:47:49,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:47:49,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:47:49,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:47:49,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:47:49,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:47:49,526 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:47:49,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:49,527 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:47:49,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:47:49,527 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:47:49,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:47:49,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:49,530 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:49,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:49,747 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:49,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:49,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:47:49,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:49,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982935482] [2020-07-20 16:47:49,749 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:49,781 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:49,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:49,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:47:49,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:49,826 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:47:49,826 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:47:49,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982935482] [2020-07-20 16:47:49,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:47:49,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:47:49,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109540699] [2020-07-20 16:47:49,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:47:49,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:49,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:47:49,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:47:49,832 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:47:49,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:49,918 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:47:49,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:47:49,919 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:47:49,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:49,921 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:47:49,922 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:47:49,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:47:49,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:47:49,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:47:49,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:47:49,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:47:49,935 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:47:49,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:49,935 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:47:49,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:47:49,936 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:47:49,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:47:49,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:49,938 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:50,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:50,154 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:50,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:50,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:47:50,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:50,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388766332] [2020-07-20 16:47:50,158 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:50,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:50,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:50,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:47:50,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:50,286 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:47:50,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:50,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:50,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:50,574 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:47:50,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388766332] [2020-07-20 16:47:50,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:50,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:47:50,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93726215] [2020-07-20 16:47:50,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:47:50,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:50,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:47:50,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:47:50,593 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:47:50,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:50,747 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:47:50,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:47:50,748 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:47:50,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:50,751 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:47:50,751 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:47:50,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:47:50,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:47:50,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:47:50,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:47:50,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:47:50,764 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:47:50,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:50,765 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:47:50,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:47:50,765 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:47:50,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:47:50,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:50,767 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:50,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:50,984 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:50,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:50,985 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:47:50,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:50,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653760265] [2020-07-20 16:47:50,987 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:51,033 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:51,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:51,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:47:51,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:51,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:47:51,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:51,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,286 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:47:51,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653760265] [2020-07-20 16:47:51,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:51,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:47:51,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690488200] [2020-07-20 16:47:51,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:47:51,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:51,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:47:51,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:47:51,289 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:47:51,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:51,434 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:47:51,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:47:51,434 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:47:51,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:51,437 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:47:51,437 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:47:51,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:47:51,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:47:51,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:47:51,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:47:51,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:47:51,447 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:47:51,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:51,447 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:47:51,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:47:51,448 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:47:51,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:47:51,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:51,450 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:51,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:51,665 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:51,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:51,666 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:47:51,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:51,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174462411] [2020-07-20 16:47:51,666 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:51,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:51,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:51,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:47:51,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:51,764 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:47:51,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:52,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,118 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:47:52,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174462411] [2020-07-20 16:47:52,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:52,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:47:52,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329746722] [2020-07-20 16:47:52,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:47:52,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:52,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:47:52,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:47:52,121 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:47:52,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:52,295 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:47:52,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:47:52,296 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:47:52,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:52,298 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:47:52,298 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:47:52,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:47:52,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:47:52,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:47:52,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:47:52,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:47:52,317 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:47:52,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:52,317 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:47:52,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:47:52,317 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:47:52,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:47:52,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:52,320 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:52,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:52,534 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:52,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:52,535 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:47:52,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:52,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1315831566] [2020-07-20 16:47:52,537 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:52,577 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:52,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:52,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:47:52,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:52,641 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:47:52,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:52,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,943 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:47:52,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1315831566] [2020-07-20 16:47:52,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:52,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:47:52,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896876274] [2020-07-20 16:47:52,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:47:52,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:52,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:47:52,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:47:52,948 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:47:53,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:53,249 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:47:53,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:47:53,250 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:47:53,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:53,257 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:47:53,258 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:47:53,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:47:53,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:47:53,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:47:53,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:47:53,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:47:53,284 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:47:53,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:53,285 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:47:53,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:47:53,285 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:47:53,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:47:53,295 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:53,295 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:53,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:53,511 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:53,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:53,512 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:47:53,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:53,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892871738] [2020-07-20 16:47:53,513 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:53,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:53,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:53,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:47:53,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:53,614 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:47:53,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:53,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:53,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:53,925 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:47:53,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892871738] [2020-07-20 16:47:53,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:53,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:47:53,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423481451] [2020-07-20 16:47:53,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:47:53,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:53,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:47:53,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:47:53,927 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:47:54,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:54,075 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:47:54,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:47:54,076 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:47:54,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:54,078 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:47:54,078 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:47:54,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:47:54,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:47:54,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:47:54,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:47:54,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:47:54,091 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:47:54,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:54,092 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:47:54,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:47:54,092 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:47:54,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:47:54,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:54,095 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:54,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:54,309 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:54,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:54,309 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:47:54,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:54,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35135758] [2020-07-20 16:47:54,311 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:54,353 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:54,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:54,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:47:54,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:54,422 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:47:54,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:54,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:54,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:54,645 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:47:54,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35135758] [2020-07-20 16:47:54,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:54,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:47:54,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964739620] [2020-07-20 16:47:54,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:47:54,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:54,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:47:54,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:47:54,648 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:47:54,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:54,766 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:47:54,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:47:54,767 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:47:54,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:54,769 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:47:54,769 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:47:54,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:47:54,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:47:54,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:47:54,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:47:54,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:47:54,782 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:47:54,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:54,782 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:47:54,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:47:54,783 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:47:54,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:47:54,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:54,785 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:54,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:54,996 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:54,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:54,996 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:47:54,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:54,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535643968] [2020-07-20 16:47:54,998 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:55,043 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:55,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:55,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:47:55,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:55,115 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:47:55,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:55,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,715 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:47:55,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535643968] [2020-07-20 16:47:55,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:55,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:47:55,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364854906] [2020-07-20 16:47:55,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:47:55,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:55,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:47:55,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:47:55,718 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:47:55,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:55,929 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:47:55,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:47:55,931 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:47:55,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:55,933 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:47:55,933 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:47:55,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:47:55,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:47:55,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:47:55,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:47:55,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:47:55,949 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:47:55,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:55,949 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:47:55,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:47:55,949 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:47:55,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:47:55,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:55,951 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:56,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:56,166 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:56,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:56,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:47:56,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:56,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1975584932] [2020-07-20 16:47:56,169 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:56,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:56,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:56,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:47:56,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:56,304 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:47:56,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:56,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,701 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:47:56,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1975584932] [2020-07-20 16:47:56,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:56,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:47:56,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604314789] [2020-07-20 16:47:56,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:47:56,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:56,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:47:56,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:47:56,704 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:47:56,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:56,913 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:47:56,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:47:56,914 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:47:56,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:56,916 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:47:56,916 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:47:56,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:47:56,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:47:56,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:47:56,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:47:56,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:47:56,931 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:47:56,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:56,931 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:47:56,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:47:56,931 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:47:56,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:47:56,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:56,934 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:57,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:57,149 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:57,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:57,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:47:57,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:57,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473398840] [2020-07-20 16:47:57,151 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:57,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:57,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:57,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:47:57,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:57,347 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:47:57,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:57,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:57,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:57,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:57,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:58,023 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:47:58,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473398840] [2020-07-20 16:47:58,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:58,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:47:58,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261846932] [2020-07-20 16:47:58,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:47:58,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:58,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:47:58,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:47:58,028 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:47:58,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:58,468 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:47:58,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:47:58,469 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:47:58,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:58,471 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:47:58,472 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:47:58,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:47:58,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:47:58,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:47:58,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:47:58,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:47:58,500 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:47:58,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:58,501 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:47:58,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:47:58,501 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:47:58,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:47:58,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:58,507 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:58,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:58,709 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:58,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:58,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:47:58,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:58,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932275755] [2020-07-20 16:47:58,711 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:58,774 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:58,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:58,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:47:58,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:58,925 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:47:58,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:59,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:59,822 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:47:59,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932275755] [2020-07-20 16:47:59,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:59,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:47:59,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904228579] [2020-07-20 16:47:59,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:47:59,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:59,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:47:59,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:47:59,825 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:48:00,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:00,872 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:48:00,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:48:00,873 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:48:00,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:00,877 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:48:00,877 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:48:00,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:48:00,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:48:00,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:48:00,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:48:00,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:48:00,898 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:48:00,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:00,898 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:48:00,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:48:00,899 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:48:00,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:48:00,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:00,900 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:01,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:01,115 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:01,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:01,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:48:01,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:01,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024778860] [2020-07-20 16:48:01,117 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:01,175 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:01,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:01,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:48:01,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:01,234 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 16:48:01,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:01,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:01,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:01,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:01,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:01,803 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:48:01,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024778860] [2020-07-20 16:48:01,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:01,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:48:01,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66778850] [2020-07-20 16:48:01,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:48:01,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:01,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:48:01,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:48:01,806 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-20 16:48:01,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:01,982 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:48:01,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:48:01,983 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-20 16:48:01,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:01,986 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:48:01,987 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:48:01,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:48:01,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:48:02,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:48:02,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:48:02,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:48:02,013 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:48:02,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:02,014 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:48:02,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:48:02,014 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:48:02,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:48:02,016 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:02,016 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:02,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:02,231 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:02,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:02,232 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:48:02,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:02,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [369248460] [2020-07-20 16:48:02,232 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:02,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:02,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:02,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:48:02,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:02,385 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-20 16:48:02,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:02,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:03,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:03,066 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-20 16:48:03,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [369248460] [2020-07-20 16:48:03,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:03,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:48:03,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127552442] [2020-07-20 16:48:03,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:48:03,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:03,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:48:03,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:48:03,068 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:48:03,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:03,577 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:48:03,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:48:03,578 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:48:03,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:03,580 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:48:03,581 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:48:03,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:48:03,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:48:03,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:48:03,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:48:03,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:48:03,609 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:48:03,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:03,610 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:48:03,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:48:03,611 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:48:03,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:48:03,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:03,613 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:03,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:03,827 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:03,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:03,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:48:03,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:03,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380206492] [2020-07-20 16:48:03,829 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:03,925 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:03,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:03,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:48:03,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:03,985 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-20 16:48:03,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:04,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:04,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:04,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:04,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:04,357 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:48:04,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380206492] [2020-07-20 16:48:04,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:04,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:48:04,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415734879] [2020-07-20 16:48:04,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:48:04,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:04,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:48:04,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:48:04,359 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-20 16:48:04,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:04,503 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:48:04,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:48:04,503 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-20 16:48:04,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:04,507 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:48:04,507 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:48:04,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:48:04,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:48:04,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:48:04,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:48:04,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:48:04,528 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:48:04,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:04,529 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:48:04,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:48:04,529 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:48:04,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:48:04,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:04,534 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:04,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:04,749 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:04,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:04,750 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:48:04,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:04,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [985878754] [2020-07-20 16:48:04,751 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:04,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:04,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:04,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:48:04,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:04,945 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-20 16:48:04,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:05,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:05,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:05,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:06,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:06,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:06,198 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 16:48:06,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [985878754] [2020-07-20 16:48:06,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:06,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:48:06,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055307] [2020-07-20 16:48:06,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:48:06,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:06,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:48:06,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:48:06,201 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:48:06,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:06,789 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:48:06,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:48:06,790 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:48:06,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:06,795 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:48:06,795 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:48:06,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:48:06,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:48:06,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:48:06,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:48:06,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:48:06,821 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:48:06,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:06,821 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:48:06,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:48:06,822 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:48:06,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:48:06,824 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:06,824 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:07,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:07,039 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:07,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:07,039 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:48:07,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:07,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965432758] [2020-07-20 16:48:07,040 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:07,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:07,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:07,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:48:07,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:07,162 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:48:07,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:07,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:07,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:07,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:07,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:07,545 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 16:48:07,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965432758] [2020-07-20 16:48:07,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:07,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:48:07,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726014932] [2020-07-20 16:48:07,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:48:07,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:07,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:48:07,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:48:07,547 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-20 16:48:07,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:07,704 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:48:07,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:48:07,704 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-20 16:48:07,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:07,707 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:48:07,708 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:48:07,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:48:07,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:48:07,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:48:07,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:48:07,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:48:07,726 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:48:07,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:07,729 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:48:07,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:48:07,729 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:48:07,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-20 16:48:07,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:07,732 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:07,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:07,946 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:07,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:07,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1156827333, now seen corresponding path program 2 times [2020-07-20 16:48:07,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:07,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386704822] [2020-07-20 16:48:07,947 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:08,023 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:08,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:08,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:48:08,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:08,139 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 110 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-20 16:48:08,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:08,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:08,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:08,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,385 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 116 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-20 16:48:09,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386704822] [2020-07-20 16:48:09,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:09,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-20 16:48:09,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841737014] [2020-07-20 16:48:09,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:48:09,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:09,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:48:09,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:48:09,388 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 23 states. [2020-07-20 16:48:10,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:10,181 INFO L93 Difference]: Finished difference Result 393 states and 799 transitions. [2020-07-20 16:48:10,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:48:10,182 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 118 [2020-07-20 16:48:10,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:10,185 INFO L225 Difference]: With dead ends: 393 [2020-07-20 16:48:10,185 INFO L226 Difference]: Without dead ends: 222 [2020-07-20 16:48:10,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 207 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=261, Invalid=1221, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:48:10,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-07-20 16:48:10,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 183. [2020-07-20 16:48:10,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:48:10,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 321 transitions. [2020-07-20 16:48:10,204 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 321 transitions. Word has length 118 [2020-07-20 16:48:10,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:10,205 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 321 transitions. [2020-07-20 16:48:10,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:48:10,205 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 321 transitions. [2020-07-20 16:48:10,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 16:48:10,208 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:10,208 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:10,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:10,420 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:10,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:10,421 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-20 16:48:10,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:10,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595524886] [2020-07-20 16:48:10,422 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:10,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:10,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:10,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:48:10,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:10,586 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 16:48:10,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:11,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,585 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 16:48:11,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595524886] [2020-07-20 16:48:11,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:11,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:48:11,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232764327] [2020-07-20 16:48:11,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:48:11,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:11,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:48:11,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:48:11,588 INFO L87 Difference]: Start difference. First operand 183 states and 321 transitions. Second operand 16 states. [2020-07-20 16:48:11,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:11,839 INFO L93 Difference]: Finished difference Result 203 states and 360 transitions. [2020-07-20 16:48:11,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:48:11,839 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-20 16:48:11,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:11,843 INFO L225 Difference]: With dead ends: 203 [2020-07-20 16:48:11,843 INFO L226 Difference]: Without dead ends: 199 [2020-07-20 16:48:11,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:48:11,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-07-20 16:48:11,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 188. [2020-07-20 16:48:11,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 16:48:11,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 333 transitions. [2020-07-20 16:48:11,863 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 333 transitions. Word has length 117 [2020-07-20 16:48:11,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:11,863 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 333 transitions. [2020-07-20 16:48:11,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:48:11,864 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 333 transitions. [2020-07-20 16:48:11,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 16:48:11,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:11,867 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:12,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:12,083 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:12,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:12,083 INFO L82 PathProgramCache]: Analyzing trace with hash -293061936, now seen corresponding path program 5 times [2020-07-20 16:48:12,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:12,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [432631324] [2020-07-20 16:48:12,084 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:12,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:12,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:12,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:48:12,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:12,314 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 165 proven. 31 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2020-07-20 16:48:12,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:12,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:12,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:13,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:13,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:13,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:13,309 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 50 proven. 100 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2020-07-20 16:48:13,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [432631324] [2020-07-20 16:48:13,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:13,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:48:13,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652328399] [2020-07-20 16:48:13,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:48:13,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:13,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:48:13,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:48:13,312 INFO L87 Difference]: Start difference. First operand 188 states and 333 transitions. Second operand 17 states. [2020-07-20 16:48:13,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:13,692 INFO L93 Difference]: Finished difference Result 374 states and 685 transitions. [2020-07-20 16:48:13,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:48:13,695 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 108 [2020-07-20 16:48:13,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:13,698 INFO L225 Difference]: With dead ends: 374 [2020-07-20 16:48:13,698 INFO L226 Difference]: Without dead ends: 192 [2020-07-20 16:48:13,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 189 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:48:13,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-20 16:48:13,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-20 16:48:13,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 16:48:13,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 327 transitions. [2020-07-20 16:48:13,716 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 327 transitions. Word has length 108 [2020-07-20 16:48:13,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:13,716 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 327 transitions. [2020-07-20 16:48:13,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:48:13,717 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 327 transitions. [2020-07-20 16:48:13,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:48:13,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:13,720 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:13,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:13,933 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:13,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:13,934 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 6 times [2020-07-20 16:48:13,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:13,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752788849] [2020-07-20 16:48:13,936 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:14,058 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:14,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:14,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:48:14,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:14,127 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 21 proven. 126 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2020-07-20 16:48:14,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:14,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:14,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:15,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:15,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:15,115 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 21 proven. 136 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2020-07-20 16:48:15,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752788849] [2020-07-20 16:48:15,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:15,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:48:15,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645062958] [2020-07-20 16:48:15,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:48:15,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:15,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:48:15,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:48:15,118 INFO L87 Difference]: Start difference. First operand 190 states and 327 transitions. Second operand 16 states. [2020-07-20 16:48:15,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:15,360 INFO L93 Difference]: Finished difference Result 219 states and 399 transitions. [2020-07-20 16:48:15,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:48:15,361 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-20 16:48:15,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:15,366 INFO L225 Difference]: With dead ends: 219 [2020-07-20 16:48:15,366 INFO L226 Difference]: Without dead ends: 215 [2020-07-20 16:48:15,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 218 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:48:15,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2020-07-20 16:48:15,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 207. [2020-07-20 16:48:15,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:48:15,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 375 transitions. [2020-07-20 16:48:15,388 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 375 transitions. Word has length 121 [2020-07-20 16:48:15,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:15,388 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 375 transitions. [2020-07-20 16:48:15,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:48:15,388 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 375 transitions. [2020-07-20 16:48:15,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-07-20 16:48:15,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:15,392 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:15,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:15,607 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:15,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:15,608 INFO L82 PathProgramCache]: Analyzing trace with hash -60942306, now seen corresponding path program 3 times [2020-07-20 16:48:15,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:15,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176421005] [2020-07-20 16:48:15,608 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:15,731 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:15,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:15,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:48:15,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:15,881 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 120 proven. 107 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2020-07-20 16:48:15,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:16,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:16,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:16,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:16,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:16,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:16,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:17,006 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 120 proven. 110 refuted. 0 times theorem prover too weak. 215 trivial. 0 not checked. [2020-07-20 16:48:17,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176421005] [2020-07-20 16:48:17,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:17,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:48:17,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021238132] [2020-07-20 16:48:17,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:48:17,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:17,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:48:17,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:48:17,009 INFO L87 Difference]: Start difference. First operand 207 states and 375 transitions. Second operand 19 states. [2020-07-20 16:48:17,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:17,464 INFO L93 Difference]: Finished difference Result 435 states and 816 transitions. [2020-07-20 16:48:17,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:48:17,466 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 132 [2020-07-20 16:48:17,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:17,471 INFO L225 Difference]: With dead ends: 435 [2020-07-20 16:48:17,471 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 16:48:17,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 234 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-20 16:48:17,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 16:48:17,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 212. [2020-07-20 16:48:17,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-20 16:48:17,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 371 transitions. [2020-07-20 16:48:17,510 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 371 transitions. Word has length 132 [2020-07-20 16:48:17,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:17,511 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 371 transitions. [2020-07-20 16:48:17,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:48:17,511 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 371 transitions. [2020-07-20 16:48:17,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:48:17,517 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:17,518 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:17,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:17,734 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:17,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:17,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 7 times [2020-07-20 16:48:17,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:17,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645162401] [2020-07-20 16:48:17,735 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:17,879 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:17,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:17,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:48:17,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:17,992 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-20 16:48:17,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:18,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:18,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:18,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:18,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:18,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:18,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:18,693 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 16:48:18,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645162401] [2020-07-20 16:48:18,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:18,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:48:18,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003459940] [2020-07-20 16:48:18,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:48:18,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:18,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:48:18,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:48:18,695 INFO L87 Difference]: Start difference. First operand 212 states and 371 transitions. Second operand 14 states. [2020-07-20 16:48:18,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:18,897 INFO L93 Difference]: Finished difference Result 242 states and 431 transitions. [2020-07-20 16:48:18,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:48:18,898 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 16:48:18,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:18,902 INFO L225 Difference]: With dead ends: 242 [2020-07-20 16:48:18,903 INFO L226 Difference]: Without dead ends: 238 [2020-07-20 16:48:18,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:48:18,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2020-07-20 16:48:18,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 212. [2020-07-20 16:48:18,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-20 16:48:18,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 371 transitions. [2020-07-20 16:48:18,926 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 371 transitions. Word has length 121 [2020-07-20 16:48:18,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:18,926 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 371 transitions. [2020-07-20 16:48:18,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:48:18,927 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 371 transitions. [2020-07-20 16:48:18,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 16:48:18,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:18,930 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:19,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:19,145 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:19,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:19,146 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 8 times [2020-07-20 16:48:19,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:19,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1766979920] [2020-07-20 16:48:19,148 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:19,338 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:19,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:19,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:48:19,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:19,430 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 73 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-07-20 16:48:19,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:20,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,405 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-07-20 16:48:20,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1766979920] [2020-07-20 16:48:20,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:20,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:48:20,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353871222] [2020-07-20 16:48:20,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:48:20,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:20,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:48:20,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:48:20,409 INFO L87 Difference]: Start difference. First operand 212 states and 371 transitions. Second operand 14 states. [2020-07-20 16:48:20,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:20,609 INFO L93 Difference]: Finished difference Result 232 states and 409 transitions. [2020-07-20 16:48:20,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:48:20,609 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-20 16:48:20,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:20,613 INFO L225 Difference]: With dead ends: 232 [2020-07-20 16:48:20,613 INFO L226 Difference]: Without dead ends: 228 [2020-07-20 16:48:20,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 245 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:48:20,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2020-07-20 16:48:20,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 212. [2020-07-20 16:48:20,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-20 16:48:20,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 371 transitions. [2020-07-20 16:48:20,637 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 371 transitions. Word has length 133 [2020-07-20 16:48:20,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:20,638 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 371 transitions. [2020-07-20 16:48:20,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:48:20,638 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 371 transitions. [2020-07-20 16:48:20,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-07-20 16:48:20,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:20,642 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:20,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:20,856 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:20,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:20,857 INFO L82 PathProgramCache]: Analyzing trace with hash -142919899, now seen corresponding path program 9 times [2020-07-20 16:48:20,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:20,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852514071] [2020-07-20 16:48:20,859 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:21,002 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:21,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:21,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:48:21,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:21,125 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 306 proven. 32 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-20 16:48:21,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:22,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,440 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 80 proven. 173 refuted. 0 times theorem prover too weak. 263 trivial. 0 not checked. [2020-07-20 16:48:22,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852514071] [2020-07-20 16:48:22,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:22,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:48:22,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190755726] [2020-07-20 16:48:22,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:48:22,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:22,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:48:22,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:48:22,443 INFO L87 Difference]: Start difference. First operand 212 states and 371 transitions. Second operand 17 states. [2020-07-20 16:48:22,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:22,923 INFO L93 Difference]: Finished difference Result 418 states and 774 transitions. [2020-07-20 16:48:22,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:48:22,924 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 146 [2020-07-20 16:48:22,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:22,929 INFO L225 Difference]: With dead ends: 418 [2020-07-20 16:48:22,929 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 16:48:22,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 265 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:48:22,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 16:48:22,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 183. [2020-07-20 16:48:22,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:48:22,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 288 transitions. [2020-07-20 16:48:22,949 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 288 transitions. Word has length 146 [2020-07-20 16:48:22,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:22,949 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 288 transitions. [2020-07-20 16:48:22,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:48:22,949 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 288 transitions. [2020-07-20 16:48:22,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:48:22,952 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:22,953 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:23,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:23,168 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:23,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:23,169 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 10 times [2020-07-20 16:48:23,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:23,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242096442] [2020-07-20 16:48:23,170 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:48:23,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:23,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:23,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:48:23,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:23,401 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 134 proven. 31 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 16:48:23,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:23,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:23,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:23,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:23,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:23,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:24,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:24,185 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 34 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 16:48:24,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242096442] [2020-07-20 16:48:24,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:24,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:48:24,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300836619] [2020-07-20 16:48:24,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:48:24,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:24,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:48:24,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:48:24,189 INFO L87 Difference]: Start difference. First operand 183 states and 288 transitions. Second operand 14 states. [2020-07-20 16:48:24,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:24,410 INFO L93 Difference]: Finished difference Result 190 states and 298 transitions. [2020-07-20 16:48:24,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:48:24,411 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 145 [2020-07-20 16:48:24,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:24,415 INFO L225 Difference]: With dead ends: 190 [2020-07-20 16:48:24,415 INFO L226 Difference]: Without dead ends: 186 [2020-07-20 16:48:24,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:48:24,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-20 16:48:24,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 166. [2020-07-20 16:48:24,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 16:48:24,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 255 transitions. [2020-07-20 16:48:24,436 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 255 transitions. Word has length 145 [2020-07-20 16:48:24,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:24,437 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 255 transitions. [2020-07-20 16:48:24,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:48:24,437 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 255 transitions. [2020-07-20 16:48:24,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-20 16:48:24,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:24,442 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 14, 14, 12, 11, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:24,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:24,658 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:24,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:24,659 INFO L82 PathProgramCache]: Analyzing trace with hash 889994812, now seen corresponding path program 11 times [2020-07-20 16:48:24,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:24,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452915090] [2020-07-20 16:48:24,660 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:48:24,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:24,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:24,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:48:24,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:25,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 702 proven. 136 refuted. 0 times theorem prover too weak. 387 trivial. 0 not checked. [2020-07-20 16:48:25,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:26,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:26,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:26,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:26,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:26,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:26,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:26,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:26,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 207 proven. 320 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2020-07-20 16:48:26,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452915090] [2020-07-20 16:48:26,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:26,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:48:26,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755520245] [2020-07-20 16:48:26,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:48:26,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:26,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:48:26,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:48:26,966 INFO L87 Difference]: Start difference. First operand 166 states and 255 transitions. Second operand 21 states. [2020-07-20 16:48:27,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:27,907 INFO L93 Difference]: Finished difference Result 406 states and 689 transitions. [2020-07-20 16:48:27,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:48:27,908 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 216 [2020-07-20 16:48:27,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:27,912 INFO L225 Difference]: With dead ends: 406 [2020-07-20 16:48:27,912 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 16:48:27,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 397 SyntacticMatches, 15 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=229, Invalid=1031, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 16:48:27,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 16:48:27,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 172. [2020-07-20 16:48:27,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-20 16:48:27,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 275 transitions. [2020-07-20 16:48:27,935 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 275 transitions. Word has length 216 [2020-07-20 16:48:27,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:27,935 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 275 transitions. [2020-07-20 16:48:27,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:48:27,936 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 275 transitions. [2020-07-20 16:48:27,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 16:48:27,939 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:27,939 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 16, 16, 11, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:28,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:28,153 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:28,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:28,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1901580408, now seen corresponding path program 5 times [2020-07-20 16:48:28,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:28,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737891670] [2020-07-20 16:48:28,154 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:48:28,327 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:28,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:28,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:48:28,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:28,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1511 backedges. 768 proven. 129 refuted. 0 times theorem prover too weak. 614 trivial. 0 not checked. [2020-07-20 16:48:28,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:29,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:29,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:29,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:29,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,575 INFO L134 CoverageAnalysis]: Checked inductivity of 1511 backedges. 284 proven. 249 refuted. 0 times theorem prover too weak. 978 trivial. 0 not checked. [2020-07-20 16:48:30,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737891670] [2020-07-20 16:48:30,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:30,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:48:30,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400343553] [2020-07-20 16:48:30,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:48:30,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:30,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:48:30,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:48:30,577 INFO L87 Difference]: Start difference. First operand 172 states and 275 transitions. Second operand 19 states. [2020-07-20 16:48:31,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:31,337 INFO L93 Difference]: Finished difference Result 438 states and 811 transitions. [2020-07-20 16:48:31,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:48:31,338 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 237 [2020-07-20 16:48:31,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:31,344 INFO L225 Difference]: With dead ends: 438 [2020-07-20 16:48:31,344 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 16:48:31,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 444 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2020-07-20 16:48:31,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 16:48:31,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 205. [2020-07-20 16:48:31,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 16:48:31,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 348 transitions. [2020-07-20 16:48:31,368 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 348 transitions. Word has length 237 [2020-07-20 16:48:31,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:31,369 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 348 transitions. [2020-07-20 16:48:31,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:48:31,369 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 348 transitions. [2020-07-20 16:48:31,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2020-07-20 16:48:31,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:31,373 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 16, 16, 12, 11, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:31,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:31,587 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:31,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:31,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1135329032, now seen corresponding path program 12 times [2020-07-20 16:48:31,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:31,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1514099289] [2020-07-20 16:48:31,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:48:31,792 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:31,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:31,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:48:31,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:32,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1541 backedges. 304 proven. 317 refuted. 0 times theorem prover too weak. 920 trivial. 0 not checked. [2020-07-20 16:48:32,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:33,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:33,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:33,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:33,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:33,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:33,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:33,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:33,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1541 backedges. 306 proven. 325 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2020-07-20 16:48:34,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1514099289] [2020-07-20 16:48:34,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:34,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:48:34,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719387072] [2020-07-20 16:48:34,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:48:34,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:34,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:48:34,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:48:34,252 INFO L87 Difference]: Start difference. First operand 205 states and 348 transitions. Second operand 23 states. [2020-07-20 16:48:35,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:35,255 INFO L93 Difference]: Finished difference Result 474 states and 893 transitions. [2020-07-20 16:48:35,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 16:48:35,257 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 240 [2020-07-20 16:48:35,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:35,260 INFO L225 Difference]: With dead ends: 474 [2020-07-20 16:48:35,261 INFO L226 Difference]: Without dead ends: 263 [2020-07-20 16:48:35,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 441 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:48:35,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2020-07-20 16:48:35,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 233. [2020-07-20 16:48:35,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-20 16:48:35,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 398 transitions. [2020-07-20 16:48:35,284 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 398 transitions. Word has length 240 [2020-07-20 16:48:35,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:35,284 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 398 transitions. [2020-07-20 16:48:35,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:48:35,285 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 398 transitions. [2020-07-20 16:48:35,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2020-07-20 16:48:35,289 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:35,290 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 21, 21, 15, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 10, 10, 10, 10, 10, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:35,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:35,504 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:35,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:35,504 INFO L82 PathProgramCache]: Analyzing trace with hash 2011831736, now seen corresponding path program 13 times [2020-07-20 16:48:35,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:35,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523618108] [2020-07-20 16:48:35,505 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:35,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:35,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:35,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:48:35,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:35,953 INFO L134 CoverageAnalysis]: Checked inductivity of 2815 backedges. 1597 proven. 290 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-20 16:48:35,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:37,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:37,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:38,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:38,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:38,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:38,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:38,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:38,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:39,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:39,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:39,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:39,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:39,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2815 backedges. 247 proven. 775 refuted. 0 times theorem prover too weak. 1793 trivial. 0 not checked. [2020-07-20 16:48:39,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523618108] [2020-07-20 16:48:39,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:39,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:48:39,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189007934] [2020-07-20 16:48:39,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:48:39,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:39,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:48:39,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:48:39,393 INFO L87 Difference]: Start difference. First operand 233 states and 398 transitions. Second operand 25 states. [2020-07-20 16:48:40,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:40,622 INFO L93 Difference]: Finished difference Result 514 states and 979 transitions. [2020-07-20 16:48:40,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:48:40,623 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 317 [2020-07-20 16:48:40,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:40,631 INFO L225 Difference]: With dead ends: 514 [2020-07-20 16:48:40,631 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 16:48:40,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 651 GetRequests, 591 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=308, Invalid=1498, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 16:48:40,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 16:48:40,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 197. [2020-07-20 16:48:40,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 16:48:40,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 316 transitions. [2020-07-20 16:48:40,657 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 316 transitions. Word has length 317 [2020-07-20 16:48:40,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:40,658 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 316 transitions. [2020-07-20 16:48:40,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:48:40,658 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 316 transitions. [2020-07-20 16:48:40,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 16:48:40,661 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:40,661 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:40,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:40,875 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:40,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:40,876 INFO L82 PathProgramCache]: Analyzing trace with hash -1711365749, now seen corresponding path program 14 times [2020-07-20 16:48:40,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:40,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024111039] [2020-07-20 16:48:40,877 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:41,087 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:41,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:41,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:48:41,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:41,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 200 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2020-07-20 16:48:41,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:42,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:42,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:42,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:42,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:42,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:42,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:42,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:42,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 210 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-07-20 16:48:42,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024111039] [2020-07-20 16:48:42,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:42,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:48:42,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155567346] [2020-07-20 16:48:42,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:48:42,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:42,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:48:42,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:48:42,611 INFO L87 Difference]: Start difference. First operand 197 states and 316 transitions. Second operand 16 states. [2020-07-20 16:48:42,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:42,882 INFO L93 Difference]: Finished difference Result 257 states and 444 transitions. [2020-07-20 16:48:42,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:48:42,883 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-20 16:48:42,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:42,886 INFO L225 Difference]: With dead ends: 257 [2020-07-20 16:48:42,886 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 16:48:42,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 377 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:48:42,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 16:48:42,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 237. [2020-07-20 16:48:42,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2020-07-20 16:48:42,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 410 transitions. [2020-07-20 16:48:42,905 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 410 transitions. Word has length 201 [2020-07-20 16:48:42,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:42,906 INFO L479 AbstractCegarLoop]: Abstraction has 237 states and 410 transitions. [2020-07-20 16:48:42,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:48:42,907 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 410 transitions. [2020-07-20 16:48:42,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2020-07-20 16:48:42,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:42,911 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 12, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:43,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:43,124 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:43,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:43,124 INFO L82 PathProgramCache]: Analyzing trace with hash -11538049, now seen corresponding path program 15 times [2020-07-20 16:48:43,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:43,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53702893] [2020-07-20 16:48:43,125 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:43,345 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:43,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:43,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:48:43,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:43,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 405 proven. 251 refuted. 0 times theorem prover too weak. 1049 trivial. 0 not checked. [2020-07-20 16:48:43,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:44,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:44,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:44,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:44,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:44,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:45,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:45,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:45,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:45,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:45,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:45,932 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 409 proven. 257 refuted. 0 times theorem prover too weak. 1039 trivial. 0 not checked. [2020-07-20 16:48:45,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53702893] [2020-07-20 16:48:45,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:45,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:48:45,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348531784] [2020-07-20 16:48:45,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:48:45,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:45,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:48:45,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:48:45,934 INFO L87 Difference]: Start difference. First operand 237 states and 410 transitions. Second operand 23 states. [2020-07-20 16:48:47,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:47,048 INFO L93 Difference]: Finished difference Result 587 states and 1205 transitions. [2020-07-20 16:48:47,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:48:47,050 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 252 [2020-07-20 16:48:47,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:47,058 INFO L225 Difference]: With dead ends: 587 [2020-07-20 16:48:47,058 INFO L226 Difference]: Without dead ends: 314 [2020-07-20 16:48:47,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 465 SyntacticMatches, 17 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=257, Invalid=1225, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:48:47,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-20 16:48:47,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 256. [2020-07-20 16:48:47,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-20 16:48:47,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 461 transitions. [2020-07-20 16:48:47,106 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 461 transitions. Word has length 252 [2020-07-20 16:48:47,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:47,107 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 461 transitions. [2020-07-20 16:48:47,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:48:47,107 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 461 transitions. [2020-07-20 16:48:47,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2020-07-20 16:48:47,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:47,114 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 17, 17, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 8, 8, 8, 8, 8, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:47,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:47,328 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:47,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:47,330 INFO L82 PathProgramCache]: Analyzing trace with hash -2034321800, now seen corresponding path program 16 times [2020-07-20 16:48:47,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:47,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638465122] [2020-07-20 16:48:47,331 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:47,580 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:47,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:47,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:48:47,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:47,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1921 backedges. 463 proven. 242 refuted. 0 times theorem prover too weak. 1216 trivial. 0 not checked. [2020-07-20 16:48:47,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:49,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:50,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:50,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:50,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:50,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1921 backedges. 463 proven. 254 refuted. 0 times theorem prover too weak. 1204 trivial. 0 not checked. [2020-07-20 16:48:50,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638465122] [2020-07-20 16:48:50,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:50,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:48:50,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093896233] [2020-07-20 16:48:50,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:48:50,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:50,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:48:50,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:48:50,358 INFO L87 Difference]: Start difference. First operand 256 states and 461 transitions. Second operand 23 states. [2020-07-20 16:48:51,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:51,752 INFO L93 Difference]: Finished difference Result 641 states and 1419 transitions. [2020-07-20 16:48:51,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:48:51,754 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 264 [2020-07-20 16:48:51,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:51,761 INFO L225 Difference]: With dead ends: 641 [2020-07-20 16:48:51,761 INFO L226 Difference]: Without dead ends: 350 [2020-07-20 16:48:51,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 489 SyntacticMatches, 17 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=302, Invalid=1420, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 16:48:51,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2020-07-20 16:48:51,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 258. [2020-07-20 16:48:51,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2020-07-20 16:48:51,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 480 transitions. [2020-07-20 16:48:51,794 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 480 transitions. Word has length 264 [2020-07-20 16:48:51,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:51,795 INFO L479 AbstractCegarLoop]: Abstraction has 258 states and 480 transitions. [2020-07-20 16:48:51,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:48:51,795 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 480 transitions. [2020-07-20 16:48:51,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2020-07-20 16:48:51,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:51,800 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:52,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:52,014 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:52,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:52,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1834385714, now seen corresponding path program 17 times [2020-07-20 16:48:52,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:52,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174159412] [2020-07-20 16:48:52,015 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:52,283 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:52,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:52,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:48:52,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:52,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2744 backedges. 100 proven. 614 refuted. 0 times theorem prover too weak. 2030 trivial. 0 not checked. [2020-07-20 16:48:52,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:54,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:55,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2744 backedges. 100 proven. 635 refuted. 0 times theorem prover too weak. 2009 trivial. 0 not checked. [2020-07-20 16:48:55,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174159412] [2020-07-20 16:48:55,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:55,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:48:55,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855716105] [2020-07-20 16:48:55,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:48:55,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:55,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:48:55,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:48:55,951 INFO L87 Difference]: Start difference. First operand 258 states and 480 transitions. Second operand 20 states. [2020-07-20 16:48:56,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:56,372 INFO L93 Difference]: Finished difference Result 275 states and 527 transitions. [2020-07-20 16:48:56,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:48:56,374 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 314 [2020-07-20 16:48:56,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:56,378 INFO L225 Difference]: With dead ends: 275 [2020-07-20 16:48:56,378 INFO L226 Difference]: Without dead ends: 271 [2020-07-20 16:48:56,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 634 GetRequests, 595 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:48:56,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-20 16:48:56,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 228. [2020-07-20 16:48:56,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2020-07-20 16:48:56,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 409 transitions. [2020-07-20 16:48:56,401 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 409 transitions. Word has length 314 [2020-07-20 16:48:56,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:56,402 INFO L479 AbstractCegarLoop]: Abstraction has 228 states and 409 transitions. [2020-07-20 16:48:56,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:48:56,402 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 409 transitions. [2020-07-20 16:48:56,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-07-20 16:48:56,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:56,408 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 29, 29, 23, 23, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14, 9, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:56,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:56,622 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:56,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:56,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1289570985, now seen corresponding path program 18 times [2020-07-20 16:48:56,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:56,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12150303] [2020-07-20 16:48:56,623 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:56,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:48:56,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:56,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:48:56,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:57,276 INFO L134 CoverageAnalysis]: Checked inductivity of 4958 backedges. 2548 proven. 665 refuted. 0 times theorem prover too weak. 1745 trivial. 0 not checked. [2020-07-20 16:48:57,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:00,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:02,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:02,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:02,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:02,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:03,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:03,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:03,209 INFO L134 CoverageAnalysis]: Checked inductivity of 4958 backedges. 418 proven. 1290 refuted. 0 times theorem prover too weak. 3250 trivial. 0 not checked. [2020-07-20 16:49:03,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12150303] [2020-07-20 16:49:03,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:03,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-20 16:49:03,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882130822] [2020-07-20 16:49:03,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:49:03,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:03,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:49:03,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:49:03,212 INFO L87 Difference]: Start difference. First operand 228 states and 409 transitions. Second operand 31 states. [2020-07-20 16:49:05,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:05,513 INFO L93 Difference]: Finished difference Result 573 states and 1188 transitions. [2020-07-20 16:49:05,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 16:49:05,514 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 419 [2020-07-20 16:49:05,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:05,519 INFO L225 Difference]: With dead ends: 573 [2020-07-20 16:49:05,519 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 16:49:05,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 787 SyntacticMatches, 21 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=496, Invalid=2696, Unknown=0, NotChecked=0, Total=3192 [2020-07-20 16:49:05,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 16:49:05,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 308. [2020-07-20 16:49:05,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-20 16:49:05,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 575 transitions. [2020-07-20 16:49:05,550 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 575 transitions. Word has length 419 [2020-07-20 16:49:05,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:05,551 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 575 transitions. [2020-07-20 16:49:05,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:49:05,551 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 575 transitions. [2020-07-20 16:49:05,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2020-07-20 16:49:05,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:05,556 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 15, 15, 13, 12, 10, 10, 10, 10, 10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:05,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:05,770 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:05,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:05,771 INFO L82 PathProgramCache]: Analyzing trace with hash -208490348, now seen corresponding path program 19 times [2020-07-20 16:49:05,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:05,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706371108] [2020-07-20 16:49:05,772 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:06,058 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:49:06,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:06,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:49:06,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:06,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 864 proven. 164 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2020-07-20 16:49:06,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:07,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:07,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:07,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:08,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:08,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:08,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:08,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:08,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:08,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 259 proven. 346 refuted. 0 times theorem prover too weak. 983 trivial. 0 not checked. [2020-07-20 16:49:08,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706371108] [2020-07-20 16:49:08,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:08,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:49:08,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391503076] [2020-07-20 16:49:08,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:49:08,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:08,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:49:08,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:49:08,781 INFO L87 Difference]: Start difference. First operand 308 states and 575 transitions. Second operand 21 states. [2020-07-20 16:49:09,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:09,700 INFO L93 Difference]: Finished difference Result 651 states and 1259 transitions. [2020-07-20 16:49:09,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 16:49:09,702 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 242 [2020-07-20 16:49:09,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:09,707 INFO L225 Difference]: With dead ends: 651 [2020-07-20 16:49:09,708 INFO L226 Difference]: Without dead ends: 335 [2020-07-20 16:49:09,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 449 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=193, Invalid=929, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 16:49:09,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2020-07-20 16:49:09,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 312. [2020-07-20 16:49:09,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2020-07-20 16:49:09,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 576 transitions. [2020-07-20 16:49:09,738 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 576 transitions. Word has length 242 [2020-07-20 16:49:09,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:09,739 INFO L479 AbstractCegarLoop]: Abstraction has 312 states and 576 transitions. [2020-07-20 16:49:09,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:49:09,739 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 576 transitions. [2020-07-20 16:49:09,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-20 16:49:09,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:09,744 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 19, 19, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:09,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:09,958 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:09,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:09,959 INFO L82 PathProgramCache]: Analyzing trace with hash -421882859, now seen corresponding path program 20 times [2020-07-20 16:49:09,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:09,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481339539] [2020-07-20 16:49:09,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:10,270 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:49:10,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:10,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:49:10,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:10,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 515 proven. 495 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2020-07-20 16:49:10,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:12,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:14,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:14,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:14,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:14,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:14,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:14,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:14,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 517 proven. 511 refuted. 0 times theorem prover too weak. 1594 trivial. 0 not checked. [2020-07-20 16:49:14,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481339539] [2020-07-20 16:49:14,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:14,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-20 16:49:14,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957499148] [2020-07-20 16:49:14,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:49:14,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:14,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:49:14,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:49:14,766 INFO L87 Difference]: Start difference. First operand 312 states and 576 transitions. Second operand 27 states. [2020-07-20 16:49:16,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:16,377 INFO L93 Difference]: Finished difference Result 653 states and 1247 transitions. [2020-07-20 16:49:16,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:49:16,378 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 305 [2020-07-20 16:49:16,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:16,384 INFO L225 Difference]: With dead ends: 653 [2020-07-20 16:49:16,384 INFO L226 Difference]: Without dead ends: 331 [2020-07-20 16:49:16,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 563 SyntacticMatches, 21 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=305, Invalid=1587, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 16:49:16,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-20 16:49:16,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 304. [2020-07-20 16:49:16,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 16:49:16,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 547 transitions. [2020-07-20 16:49:16,414 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 547 transitions. Word has length 305 [2020-07-20 16:49:16,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:16,414 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 547 transitions. [2020-07-20 16:49:16,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:49:16,415 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 547 transitions. [2020-07-20 16:49:16,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-07-20 16:49:16,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:16,421 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 24, 22, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 12, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:16,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:16,635 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:16,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:16,636 INFO L82 PathProgramCache]: Analyzing trace with hash -162370002, now seen corresponding path program 21 times [2020-07-20 16:49:16,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:16,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74260761] [2020-07-20 16:49:16,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:17,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:49:17,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:17,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:49:17,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:17,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5887 backedges. 703 proven. 1068 refuted. 0 times theorem prover too weak. 4116 trivial. 0 not checked. [2020-07-20 16:49:17,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:20,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:20,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:20,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:20,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:21,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:21,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:21,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:21,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:21,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:23,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:23,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:23,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:23,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:23,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5887 backedges. 705 proven. 1092 refuted. 0 times theorem prover too weak. 4090 trivial. 0 not checked. [2020-07-20 16:49:23,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74260761] [2020-07-20 16:49:23,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:23,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-20 16:49:23,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721962124] [2020-07-20 16:49:23,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:49:23,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:23,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:49:23,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:49:23,310 INFO L87 Difference]: Start difference. First operand 304 states and 547 transitions. Second operand 31 states. [2020-07-20 16:49:25,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:25,882 INFO L93 Difference]: Finished difference Result 803 states and 1580 transitions. [2020-07-20 16:49:25,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-20 16:49:25,884 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 455 [2020-07-20 16:49:25,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:25,892 INFO L225 Difference]: With dead ends: 803 [2020-07-20 16:49:25,893 INFO L226 Difference]: Without dead ends: 485 [2020-07-20 16:49:25,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 859 SyntacticMatches, 21 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 723 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=536, Invalid=3004, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 16:49:25,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2020-07-20 16:49:25,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 441. [2020-07-20 16:49:25,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 441 states. [2020-07-20 16:49:25,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 850 transitions. [2020-07-20 16:49:25,937 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 850 transitions. Word has length 455 [2020-07-20 16:49:25,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:25,938 INFO L479 AbstractCegarLoop]: Abstraction has 441 states and 850 transitions. [2020-07-20 16:49:25,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:49:25,938 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 850 transitions. [2020-07-20 16:49:25,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-20 16:49:25,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:25,945 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 23, 23, 16, 15, 14, 14, 14, 14, 14, 14, 14, 13, 11, 11, 11, 11, 11, 11, 11, 7, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:26,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:26,160 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:26,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:26,161 INFO L82 PathProgramCache]: Analyzing trace with hash 512947792, now seen corresponding path program 22 times [2020-07-20 16:49:26,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:26,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109544247] [2020-07-20 16:49:26,162 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:26,543 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:49:26,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:26,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:49:26,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:26,731 INFO L134 CoverageAnalysis]: Checked inductivity of 3333 backedges. 153 proven. 555 refuted. 0 times theorem prover too weak. 2625 trivial. 0 not checked. [2020-07-20 16:49:26,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:28,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:28,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,803 INFO L134 CoverageAnalysis]: Checked inductivity of 3333 backedges. 153 proven. 571 refuted. 0 times theorem prover too weak. 2609 trivial. 0 not checked. [2020-07-20 16:49:29,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109544247] [2020-07-20 16:49:29,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:29,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:49:29,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226849008] [2020-07-20 16:49:29,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:49:29,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:29,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:49:29,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:49:29,805 INFO L87 Difference]: Start difference. First operand 441 states and 850 transitions. Second operand 18 states. [2020-07-20 16:49:30,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:30,212 INFO L93 Difference]: Finished difference Result 481 states and 923 transitions. [2020-07-20 16:49:30,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:49:30,213 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 344 [2020-07-20 16:49:30,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:30,220 INFO L225 Difference]: With dead ends: 481 [2020-07-20 16:49:30,220 INFO L226 Difference]: Without dead ends: 477 [2020-07-20 16:49:30,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 659 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:49:30,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2020-07-20 16:49:30,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 474. [2020-07-20 16:49:30,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 474 states. [2020-07-20 16:49:30,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 913 transitions. [2020-07-20 16:49:30,259 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 913 transitions. Word has length 344 [2020-07-20 16:49:30,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:30,259 INFO L479 AbstractCegarLoop]: Abstraction has 474 states and 913 transitions. [2020-07-20 16:49:30,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:49:30,259 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 913 transitions. [2020-07-20 16:49:30,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-07-20 16:49:30,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:30,268 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 27, 27, 21, 20, 17, 17, 17, 17, 17, 17, 17, 14, 13, 13, 13, 13, 13, 13, 13, 7, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:30,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:30,482 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:30,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:30,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1913743513, now seen corresponding path program 23 times [2020-07-20 16:49:30,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:30,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386318609] [2020-07-20 16:49:30,483 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:30,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:49:30,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:30,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:49:30,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:31,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4904 backedges. 605 proven. 1075 refuted. 0 times theorem prover too weak. 3224 trivial. 0 not checked. [2020-07-20 16:49:31,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:33,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:33,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:34,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:34,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:34,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:35,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:36,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:38,016 INFO L134 CoverageAnalysis]: Checked inductivity of 4904 backedges. 605 proven. 1107 refuted. 0 times theorem prover too weak. 3192 trivial. 0 not checked. [2020-07-20 16:49:38,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386318609] [2020-07-20 16:49:38,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:38,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:49:38,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350823432] [2020-07-20 16:49:38,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:49:38,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:38,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:49:38,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:49:38,021 INFO L87 Difference]: Start difference. First operand 474 states and 913 transitions. Second operand 31 states. [2020-07-20 16:49:41,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:41,091 INFO L93 Difference]: Finished difference Result 1091 states and 2196 transitions. [2020-07-20 16:49:41,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 16:49:41,093 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 414 [2020-07-20 16:49:41,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:41,101 INFO L225 Difference]: With dead ends: 1091 [2020-07-20 16:49:41,101 INFO L226 Difference]: Without dead ends: 616 [2020-07-20 16:49:41,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 773 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 16:49:41,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-20 16:49:41,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 510. [2020-07-20 16:49:41,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 510 states. [2020-07-20 16:49:41,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 983 transitions. [2020-07-20 16:49:41,151 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 983 transitions. Word has length 414 [2020-07-20 16:49:41,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:41,151 INFO L479 AbstractCegarLoop]: Abstraction has 510 states and 983 transitions. [2020-07-20 16:49:41,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:49:41,152 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 983 transitions. [2020-07-20 16:49:41,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 16:49:41,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:41,159 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 23, 23, 16, 15, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 11, 11, 11, 11, 11, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:41,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:41,373 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:41,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:41,374 INFO L82 PathProgramCache]: Analyzing trace with hash -2112342521, now seen corresponding path program 24 times [2020-07-20 16:49:41,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:41,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638148853] [2020-07-20 16:49:41,374 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:41,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:49:41,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:41,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:49:41,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:42,095 INFO L134 CoverageAnalysis]: Checked inductivity of 3069 backedges. 128 proven. 643 refuted. 0 times theorem prover too weak. 2298 trivial. 0 not checked. [2020-07-20 16:49:42,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:44,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:45,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:45,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:45,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:46,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:46,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:46,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:46,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:46,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:46,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:46,596 INFO L134 CoverageAnalysis]: Checked inductivity of 3069 backedges. 128 proven. 667 refuted. 0 times theorem prover too weak. 2274 trivial. 0 not checked. [2020-07-20 16:49:46,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638148853] [2020-07-20 16:49:46,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:46,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:49:46,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891491033] [2020-07-20 16:49:46,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:49:46,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:46,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:49:46,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:49:46,598 INFO L87 Difference]: Start difference. First operand 510 states and 983 transitions. Second operand 20 states. [2020-07-20 16:49:47,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:47,143 INFO L93 Difference]: Finished difference Result 523 states and 1003 transitions. [2020-07-20 16:49:47,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:49:47,145 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 332 [2020-07-20 16:49:47,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:47,153 INFO L225 Difference]: With dead ends: 523 [2020-07-20 16:49:47,154 INFO L226 Difference]: Without dead ends: 519 [2020-07-20 16:49:47,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 670 GetRequests, 631 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:49:47,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2020-07-20 16:49:47,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 508. [2020-07-20 16:49:47,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 508 states. [2020-07-20 16:49:47,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 975 transitions. [2020-07-20 16:49:47,199 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 975 transitions. Word has length 332 [2020-07-20 16:49:47,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:47,199 INFO L479 AbstractCegarLoop]: Abstraction has 508 states and 975 transitions. [2020-07-20 16:49:47,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:49:47,199 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 975 transitions. [2020-07-20 16:49:47,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-07-20 16:49:47,204 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:47,205 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 23, 23, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:47,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:47,406 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:47,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:47,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1020301094, now seen corresponding path program 25 times [2020-07-20 16:49:47,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:47,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257862002] [2020-07-20 16:49:47,408 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:47,851 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:49:47,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:47,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:49:47,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:48,210 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 3348 proven. 365 refuted. 0 times theorem prover too weak. 2173 trivial. 0 not checked. [2020-07-20 16:49:48,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:51,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:51,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:52,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:52,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:52,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:52,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:52,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:52,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:53,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:53,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:53,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:53,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:53,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:53,809 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 473 proven. 1121 refuted. 0 times theorem prover too weak. 4292 trivial. 0 not checked. [2020-07-20 16:49:53,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257862002] [2020-07-20 16:49:53,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:53,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:49:53,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613325339] [2020-07-20 16:49:53,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:49:53,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:53,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:49:53,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:49:53,813 INFO L87 Difference]: Start difference. First operand 508 states and 975 transitions. Second operand 25 states. [2020-07-20 16:49:55,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:55,931 INFO L93 Difference]: Finished difference Result 1250 states and 2468 transitions. [2020-07-20 16:49:55,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:49:55,932 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 455 [2020-07-20 16:49:55,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:55,941 INFO L225 Difference]: With dead ends: 1250 [2020-07-20 16:49:55,942 INFO L226 Difference]: Without dead ends: 716 [2020-07-20 16:49:55,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 930 GetRequests, 867 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=344, Invalid=1726, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:49:55,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2020-07-20 16:49:55,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 550. [2020-07-20 16:49:55,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 550 states. [2020-07-20 16:49:56,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 1072 transitions. [2020-07-20 16:49:56,005 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 1072 transitions. Word has length 455 [2020-07-20 16:49:56,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:56,006 INFO L479 AbstractCegarLoop]: Abstraction has 550 states and 1072 transitions. [2020-07-20 16:49:56,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:49:56,006 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 1072 transitions. [2020-07-20 16:49:56,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-20 16:49:56,016 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:56,017 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 35, 35, 23, 23, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 17, 12, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:56,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:56,231 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:56,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:56,232 INFO L82 PathProgramCache]: Analyzing trace with hash -119206550, now seen corresponding path program 26 times [2020-07-20 16:49:56,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:56,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2000206394] [2020-07-20 16:49:56,233 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:56,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:49:56,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:56,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:49:56,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:57,083 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 4140 proven. 377 refuted. 0 times theorem prover too weak. 2793 trivial. 0 not checked. [2020-07-20 16:49:57,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:00,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:00,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:01,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:01,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:01,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:01,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:01,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:01,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:02,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:02,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:02,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:02,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:02,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:02,848 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 607 proven. 1177 refuted. 0 times theorem prover too weak. 5526 trivial. 0 not checked. [2020-07-20 16:50:02,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2000206394] [2020-07-20 16:50:02,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:02,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:50:02,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574699129] [2020-07-20 16:50:02,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:50:02,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:02,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:50:02,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:50:02,852 INFO L87 Difference]: Start difference. First operand 550 states and 1072 transitions. Second operand 25 states. [2020-07-20 16:50:04,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:04,691 INFO L93 Difference]: Finished difference Result 1171 states and 2304 transitions. [2020-07-20 16:50:04,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:50:04,693 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 503 [2020-07-20 16:50:04,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:04,703 INFO L225 Difference]: With dead ends: 1171 [2020-07-20 16:50:04,703 INFO L226 Difference]: Without dead ends: 591 [2020-07-20 16:50:04,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1026 GetRequests, 963 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=340, Invalid=1730, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:50:04,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2020-07-20 16:50:04,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 536. [2020-07-20 16:50:04,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 536 states. [2020-07-20 16:50:04,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 1038 transitions. [2020-07-20 16:50:04,755 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 1038 transitions. Word has length 503 [2020-07-20 16:50:04,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:04,756 INFO L479 AbstractCegarLoop]: Abstraction has 536 states and 1038 transitions. [2020-07-20 16:50:04,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:50:04,757 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 1038 transitions. [2020-07-20 16:50:04,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-20 16:50:04,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:04,764 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 17, 16, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:04,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:04,978 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:04,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:04,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1699852801, now seen corresponding path program 27 times [2020-07-20 16:50:04,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:04,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215390779] [2020-07-20 16:50:04,980 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:05,444 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:50:05,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:05,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:50:05,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:05,595 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 169 proven. 455 refuted. 0 times theorem prover too weak. 2008 trivial. 0 not checked. [2020-07-20 16:50:05,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:07,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:08,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:08,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:08,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:08,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:08,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:08,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:08,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:09,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:09,160 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 169 proven. 471 refuted. 0 times theorem prover too weak. 1992 trivial. 0 not checked. [2020-07-20 16:50:09,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215390779] [2020-07-20 16:50:09,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:09,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:50:09,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170836556] [2020-07-20 16:50:09,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:50:09,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:09,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:50:09,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:50:09,162 INFO L87 Difference]: Start difference. First operand 536 states and 1038 transitions. Second operand 18 states. [2020-07-20 16:50:09,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:09,633 INFO L93 Difference]: Finished difference Result 613 states and 1217 transitions. [2020-07-20 16:50:09,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:50:09,634 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 310 [2020-07-20 16:50:09,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:09,642 INFO L225 Difference]: With dead ends: 613 [2020-07-20 16:50:09,642 INFO L226 Difference]: Without dead ends: 609 [2020-07-20 16:50:09,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 591 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:50:09,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2020-07-20 16:50:09,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 539. [2020-07-20 16:50:09,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2020-07-20 16:50:09,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 1044 transitions. [2020-07-20 16:50:09,689 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 1044 transitions. Word has length 310 [2020-07-20 16:50:09,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:09,690 INFO L479 AbstractCegarLoop]: Abstraction has 539 states and 1044 transitions. [2020-07-20 16:50:09,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:50:09,690 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 1044 transitions. [2020-07-20 16:50:09,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-20 16:50:09,697 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:09,697 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 17, 16, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 12, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:09,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:09,898 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:09,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:09,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1477326013, now seen corresponding path program 28 times [2020-07-20 16:50:09,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:09,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631824158] [2020-07-20 16:50:09,900 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:10,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:50:10,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:10,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 693 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:50:10,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:10,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3596 backedges. 254 proven. 486 refuted. 0 times theorem prover too weak. 2856 trivial. 0 not checked. [2020-07-20 16:50:10,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:12,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:12,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:13,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:13,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:13,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:14,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:14,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:14,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:14,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:14,551 INFO L134 CoverageAnalysis]: Checked inductivity of 3596 backedges. 256 proven. 500 refuted. 0 times theorem prover too weak. 2840 trivial. 0 not checked. [2020-07-20 16:50:14,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631824158] [2020-07-20 16:50:14,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:14,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:50:14,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681034394] [2020-07-20 16:50:14,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:50:14,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:14,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:50:14,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:50:14,553 INFO L87 Difference]: Start difference. First operand 539 states and 1044 transitions. Second operand 18 states. [2020-07-20 16:50:15,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:15,049 INFO L93 Difference]: Finished difference Result 554 states and 1078 transitions. [2020-07-20 16:50:15,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:50:15,051 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 358 [2020-07-20 16:50:15,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:15,058 INFO L225 Difference]: With dead ends: 554 [2020-07-20 16:50:15,058 INFO L226 Difference]: Without dead ends: 550 [2020-07-20 16:50:15,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:50:15,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2020-07-20 16:50:15,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 539. [2020-07-20 16:50:15,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2020-07-20 16:50:15,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 1044 transitions. [2020-07-20 16:50:15,093 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 1044 transitions. Word has length 358 [2020-07-20 16:50:15,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:15,095 INFO L479 AbstractCegarLoop]: Abstraction has 539 states and 1044 transitions. [2020-07-20 16:50:15,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:50:15,095 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 1044 transitions. [2020-07-20 16:50:15,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 381 [2020-07-20 16:50:15,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:15,104 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 26, 26, 22, 21, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 9, 7, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:15,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:15,319 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:15,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:15,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1188361054, now seen corresponding path program 29 times [2020-07-20 16:50:15,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:15,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171466013] [2020-07-20 16:50:15,320 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:15,781 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:50:15,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:15,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:50:15,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:16,087 INFO L134 CoverageAnalysis]: Checked inductivity of 4041 backedges. 2221 proven. 206 refuted. 0 times theorem prover too weak. 1614 trivial. 0 not checked. [2020-07-20 16:50:16,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:20,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:20,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:20,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:21,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:21,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:21,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:22,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:22,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:22,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:22,407 INFO L134 CoverageAnalysis]: Checked inductivity of 4041 backedges. 332 proven. 1006 refuted. 0 times theorem prover too weak. 2703 trivial. 0 not checked. [2020-07-20 16:50:22,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171466013] [2020-07-20 16:50:22,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:22,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:50:22,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222724396] [2020-07-20 16:50:22,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:50:22,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:22,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:50:22,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:50:22,409 INFO L87 Difference]: Start difference. First operand 539 states and 1044 transitions. Second operand 25 states. [2020-07-20 16:50:23,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:23,957 INFO L93 Difference]: Finished difference Result 1041 states and 2061 transitions. [2020-07-20 16:50:23,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:50:23,958 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 380 [2020-07-20 16:50:23,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:23,967 INFO L225 Difference]: With dead ends: 1041 [2020-07-20 16:50:23,967 INFO L226 Difference]: Without dead ends: 508 [2020-07-20 16:50:23,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 717 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:50:23,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2020-07-20 16:50:23,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 476. [2020-07-20 16:50:23,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 476 states. [2020-07-20 16:50:24,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 845 transitions. [2020-07-20 16:50:24,001 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 845 transitions. Word has length 380 [2020-07-20 16:50:24,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:24,002 INFO L479 AbstractCegarLoop]: Abstraction has 476 states and 845 transitions. [2020-07-20 16:50:24,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:50:24,002 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 845 transitions. [2020-07-20 16:50:24,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-20 16:50:24,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:24,008 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 27, 27, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 11, 10, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:24,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:24,209 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:24,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:24,210 INFO L82 PathProgramCache]: Analyzing trace with hash -543124688, now seen corresponding path program 30 times [2020-07-20 16:50:24,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:24,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302498843] [2020-07-20 16:50:24,211 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:24,830 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:50:24,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:24,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:50:24,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:25,102 INFO L134 CoverageAnalysis]: Checked inductivity of 7474 backedges. 211 proven. 1248 refuted. 0 times theorem prover too weak. 6015 trivial. 0 not checked. [2020-07-20 16:50:25,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:29,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:29,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:30,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:30,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:31,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:32,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:32,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:32,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:32,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:32,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:32,957 INFO L134 CoverageAnalysis]: Checked inductivity of 7474 backedges. 211 proven. 1281 refuted. 0 times theorem prover too weak. 5982 trivial. 0 not checked. [2020-07-20 16:50:32,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302498843] [2020-07-20 16:50:32,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:32,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 16:50:32,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372916885] [2020-07-20 16:50:32,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:50:32,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:32,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:50:32,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:50:32,959 INFO L87 Difference]: Start difference. First operand 476 states and 845 transitions. Second operand 22 states. [2020-07-20 16:50:33,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:33,694 INFO L93 Difference]: Finished difference Result 522 states and 1000 transitions. [2020-07-20 16:50:33,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:50:33,696 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 511 [2020-07-20 16:50:33,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:33,702 INFO L225 Difference]: With dead ends: 522 [2020-07-20 16:50:33,703 INFO L226 Difference]: Without dead ends: 518 [2020-07-20 16:50:33,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1029 GetRequests, 985 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:50:33,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2020-07-20 16:50:33,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 510. [2020-07-20 16:50:33,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 510 states. [2020-07-20 16:50:33,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 972 transitions. [2020-07-20 16:50:33,747 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 972 transitions. Word has length 511 [2020-07-20 16:50:33,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:33,748 INFO L479 AbstractCegarLoop]: Abstraction has 510 states and 972 transitions. [2020-07-20 16:50:33,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:50:33,748 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 972 transitions. [2020-07-20 16:50:33,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 16:50:33,757 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:33,757 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 34, 34, 27, 27, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 12, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:33,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:33,973 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:33,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:33,974 INFO L82 PathProgramCache]: Analyzing trace with hash 472687227, now seen corresponding path program 31 times [2020-07-20 16:50:33,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:33,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873770085] [2020-07-20 16:50:33,975 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:34,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:50:34,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:34,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:50:34,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:34,871 INFO L134 CoverageAnalysis]: Checked inductivity of 7138 backedges. 234 proven. 1025 refuted. 0 times theorem prover too weak. 5879 trivial. 0 not checked. [2020-07-20 16:50:34,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:38,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:39,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:39,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:39,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7138 backedges. 234 proven. 1049 refuted. 0 times theorem prover too weak. 5855 trivial. 0 not checked. [2020-07-20 16:50:40,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873770085] [2020-07-20 16:50:40,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:40,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:50:40,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85434816] [2020-07-20 16:50:40,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:50:40,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:40,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:50:40,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:50:40,967 INFO L87 Difference]: Start difference. First operand 510 states and 972 transitions. Second operand 20 states. [2020-07-20 16:50:41,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:41,661 INFO L93 Difference]: Finished difference Result 560 states and 1168 transitions. [2020-07-20 16:50:41,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:50:41,662 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 499 [2020-07-20 16:50:41,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:41,670 INFO L225 Difference]: With dead ends: 560 [2020-07-20 16:50:41,670 INFO L226 Difference]: Without dead ends: 556 [2020-07-20 16:50:41,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1004 GetRequests, 965 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:50:41,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2020-07-20 16:50:41,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 496. [2020-07-20 16:50:41,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 496 states. [2020-07-20 16:50:41,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 919 transitions. [2020-07-20 16:50:41,702 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 919 transitions. Word has length 499 [2020-07-20 16:50:41,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:41,702 INFO L479 AbstractCegarLoop]: Abstraction has 496 states and 919 transitions. [2020-07-20 16:50:41,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:50:41,702 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 919 transitions. [2020-07-20 16:50:41,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-20 16:50:41,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:41,709 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 39, 39, 27, 27, 22, 22, 22, 22, 22, 22, 22, 19, 19, 19, 19, 19, 19, 19, 17, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:41,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:41,910 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:41,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:41,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1050418, now seen corresponding path program 32 times [2020-07-20 16:50:41,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:41,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003250197] [2020-07-20 16:50:41,912 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:42,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:50:42,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:42,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:50:42,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:42,824 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 296 proven. 1113 refuted. 0 times theorem prover too weak. 7649 trivial. 0 not checked. [2020-07-20 16:50:42,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:46,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:48,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:48,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:48,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:49,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:49,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:49,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:50,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:50,287 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 296 proven. 1137 refuted. 0 times theorem prover too weak. 7625 trivial. 0 not checked. [2020-07-20 16:50:50,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003250197] [2020-07-20 16:50:50,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:50,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:50:50,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293724110] [2020-07-20 16:50:50,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:50:50,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:50,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:50:50,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:50:50,290 INFO L87 Difference]: Start difference. First operand 496 states and 919 transitions. Second operand 20 states. [2020-07-20 16:50:51,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:51,182 INFO L93 Difference]: Finished difference Result 581 states and 1297 transitions. [2020-07-20 16:50:51,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:50:51,185 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 559 [2020-07-20 16:50:51,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:51,194 INFO L225 Difference]: With dead ends: 581 [2020-07-20 16:50:51,194 INFO L226 Difference]: Without dead ends: 577 [2020-07-20 16:50:51,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1124 GetRequests, 1085 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:50:51,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2020-07-20 16:50:51,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 506. [2020-07-20 16:50:51,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 506 states. [2020-07-20 16:50:51,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 969 transitions. [2020-07-20 16:50:51,232 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 969 transitions. Word has length 559 [2020-07-20 16:50:51,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:51,234 INFO L479 AbstractCegarLoop]: Abstraction has 506 states and 969 transitions. [2020-07-20 16:50:51,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:50:51,234 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 969 transitions. [2020-07-20 16:50:51,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 516 [2020-07-20 16:50:51,242 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:51,242 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 37, 37, 23, 23, 20, 20, 20, 20, 20, 20, 20, 18, 18, 18, 18, 18, 18, 18, 17, 14, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:51,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:51,450 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:51,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:51,451 INFO L82 PathProgramCache]: Analyzing trace with hash 451142961, now seen corresponding path program 33 times [2020-07-20 16:50:51,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:51,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947435748] [2020-07-20 16:50:51,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:52,066 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:50:52,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:52,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:50:52,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:52,600 INFO L134 CoverageAnalysis]: Checked inductivity of 7662 backedges. 1292 proven. 888 refuted. 0 times theorem prover too weak. 5482 trivial. 0 not checked. [2020-07-20 16:50:52,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:56,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:57,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:57,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:57,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:58,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:58,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:58,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:58,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:01,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:01,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:01,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:03,476 INFO L134 CoverageAnalysis]: Checked inductivity of 7662 backedges. 1292 proven. 918 refuted. 0 times theorem prover too weak. 5452 trivial. 0 not checked. [2020-07-20 16:51:03,476 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947435748] [2020-07-20 16:51:03,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:03,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:51:03,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468269629] [2020-07-20 16:51:03,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:51:03,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:03,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:51:03,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:51:03,479 INFO L87 Difference]: Start difference. First operand 506 states and 969 transitions. Second operand 31 states. [2020-07-20 16:51:06,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:06,868 INFO L93 Difference]: Finished difference Result 1064 states and 2114 transitions. [2020-07-20 16:51:06,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:51:06,871 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 515 [2020-07-20 16:51:06,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:06,888 INFO L225 Difference]: With dead ends: 1064 [2020-07-20 16:51:06,888 INFO L226 Difference]: Without dead ends: 552 [2020-07-20 16:51:06,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1048 GetRequests, 975 SyntacticMatches, 25 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=377, Invalid=2073, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 16:51:06,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2020-07-20 16:51:06,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 511. [2020-07-20 16:51:06,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 511 states. [2020-07-20 16:51:06,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 919 transitions. [2020-07-20 16:51:06,962 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 919 transitions. Word has length 515 [2020-07-20 16:51:06,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:06,964 INFO L479 AbstractCegarLoop]: Abstraction has 511 states and 919 transitions. [2020-07-20 16:51:06,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:51:06,964 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 919 transitions. [2020-07-20 16:51:06,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-20 16:51:06,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:06,981 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 39, 27, 27, 20, 20, 20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 19, 13, 12, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:07,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:07,289 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:07,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:07,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1275836484, now seen corresponding path program 34 times [2020-07-20 16:51:07,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:07,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289036086] [2020-07-20 16:51:07,291 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:07,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:07,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:07,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:51:08,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:08,224 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 342 proven. 1007 refuted. 0 times theorem prover too weak. 6881 trivial. 0 not checked. [2020-07-20 16:51:08,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:10,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:10,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:11,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:12,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:12,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:12,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:12,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:12,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:12,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:12,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:13,130 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 344 proven. 1029 refuted. 0 times theorem prover too weak. 6857 trivial. 0 not checked. [2020-07-20 16:51:13,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289036086] [2020-07-20 16:51:13,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:13,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:51:13,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765461094] [2020-07-20 16:51:13,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:51:13,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:13,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:51:13,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:51:13,132 INFO L87 Difference]: Start difference. First operand 511 states and 919 transitions. Second operand 20 states. [2020-07-20 16:51:13,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:13,540 INFO L93 Difference]: Finished difference Result 576 states and 1125 transitions. [2020-07-20 16:51:13,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:51:13,541 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 535 [2020-07-20 16:51:13,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:13,548 INFO L225 Difference]: With dead ends: 576 [2020-07-20 16:51:13,548 INFO L226 Difference]: Without dead ends: 572 [2020-07-20 16:51:13,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1076 GetRequests, 1037 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:51:13,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-20 16:51:13,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 511. [2020-07-20 16:51:13,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 511 states. [2020-07-20 16:51:13,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 919 transitions. [2020-07-20 16:51:13,572 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 919 transitions. Word has length 535 [2020-07-20 16:51:13,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:13,573 INFO L479 AbstractCegarLoop]: Abstraction has 511 states and 919 transitions. [2020-07-20 16:51:13,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:51:13,573 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 919 transitions. [2020-07-20 16:51:13,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 572 [2020-07-20 16:51:13,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:13,578 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 40, 40, 27, 27, 22, 22, 22, 22, 22, 22, 22, 20, 20, 20, 20, 20, 20, 20, 18, 13, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:13,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:13,779 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:13,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:13,779 INFO L82 PathProgramCache]: Analyzing trace with hash 988558219, now seen corresponding path program 35 times [2020-07-20 16:51:13,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:13,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979789139] [2020-07-20 16:51:13,780 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:14,482 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:14,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:14,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:51:14,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:14,774 INFO L134 CoverageAnalysis]: Checked inductivity of 9466 backedges. 506 proven. 951 refuted. 0 times theorem prover too weak. 8009 trivial. 0 not checked. [2020-07-20 16:51:14,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:17,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:17,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:18,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:18,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:18,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:18,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:19,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:19,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:19,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:19,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:20,179 INFO L134 CoverageAnalysis]: Checked inductivity of 9466 backedges. 508 proven. 973 refuted. 0 times theorem prover too weak. 7985 trivial. 0 not checked. [2020-07-20 16:51:20,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979789139] [2020-07-20 16:51:20,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:20,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:51:20,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073920203] [2020-07-20 16:51:20,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:51:20,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:20,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:51:20,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:51:20,181 INFO L87 Difference]: Start difference. First operand 511 states and 919 transitions. Second operand 20 states. [2020-07-20 16:51:20,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:20,605 INFO L93 Difference]: Finished difference Result 546 states and 1007 transitions. [2020-07-20 16:51:20,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:51:20,606 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 571 [2020-07-20 16:51:20,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:20,614 INFO L225 Difference]: With dead ends: 546 [2020-07-20 16:51:20,614 INFO L226 Difference]: Without dead ends: 542 [2020-07-20 16:51:20,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1148 GetRequests, 1109 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:51:20,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2020-07-20 16:51:20,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 506. [2020-07-20 16:51:20,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 506 states. [2020-07-20 16:51:20,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 906 transitions. [2020-07-20 16:51:20,640 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 906 transitions. Word has length 571 [2020-07-20 16:51:20,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:20,641 INFO L479 AbstractCegarLoop]: Abstraction has 506 states and 906 transitions. [2020-07-20 16:51:20,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:51:20,641 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 906 transitions. [2020-07-20 16:51:20,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 584 [2020-07-20 16:51:20,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:20,647 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 41, 41, 27, 27, 23, 23, 23, 23, 23, 23, 23, 20, 20, 20, 20, 20, 20, 20, 19, 14, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:20,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:20,848 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:20,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:20,849 INFO L82 PathProgramCache]: Analyzing trace with hash 296170694, now seen corresponding path program 36 times [2020-07-20 16:51:20,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:20,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456628479] [2020-07-20 16:51:20,850 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:21,613 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:21,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:21,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 1127 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:51:21,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:21,896 INFO L134 CoverageAnalysis]: Checked inductivity of 9894 backedges. 368 proven. 913 refuted. 0 times theorem prover too weak. 8613 trivial. 0 not checked. [2020-07-20 16:51:21,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:24,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:25,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:25,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:26,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:26,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:26,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:26,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:26,715 INFO L134 CoverageAnalysis]: Checked inductivity of 9894 backedges. 368 proven. 929 refuted. 0 times theorem prover too weak. 8597 trivial. 0 not checked. [2020-07-20 16:51:26,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456628479] [2020-07-20 16:51:26,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:26,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:51:26,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084679141] [2020-07-20 16:51:26,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:51:26,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:26,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:51:26,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:51:26,718 INFO L87 Difference]: Start difference. First operand 506 states and 906 transitions. Second operand 18 states. [2020-07-20 16:51:27,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:27,104 INFO L93 Difference]: Finished difference Result 561 states and 1079 transitions. [2020-07-20 16:51:27,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:51:27,106 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 583 [2020-07-20 16:51:27,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:27,113 INFO L225 Difference]: With dead ends: 561 [2020-07-20 16:51:27,113 INFO L226 Difference]: Without dead ends: 557 [2020-07-20 16:51:27,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1171 GetRequests, 1137 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:51:27,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 557 states. [2020-07-20 16:51:27,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 557 to 501. [2020-07-20 16:51:27,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 501 states. [2020-07-20 16:51:27,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 890 transitions. [2020-07-20 16:51:27,141 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 890 transitions. Word has length 583 [2020-07-20 16:51:27,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:27,141 INFO L479 AbstractCegarLoop]: Abstraction has 501 states and 890 transitions. [2020-07-20 16:51:27,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:51:27,142 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 890 transitions. [2020-07-20 16:51:27,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 572 [2020-07-20 16:51:27,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:27,147 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 27, 27, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 16, 15, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:27,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:27,349 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:27,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:27,350 INFO L82 PathProgramCache]: Analyzing trace with hash -164628019, now seen corresponding path program 37 times [2020-07-20 16:51:27,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:27,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985190168] [2020-07-20 16:51:27,351 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:28,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:28,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:28,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:51:28,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:28,487 INFO L134 CoverageAnalysis]: Checked inductivity of 9438 backedges. 491 proven. 756 refuted. 0 times theorem prover too weak. 8191 trivial. 0 not checked. [2020-07-20 16:51:28,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:31,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:31,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:32,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:33,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:33,663 INFO L134 CoverageAnalysis]: Checked inductivity of 9438 backedges. 493 proven. 770 refuted. 0 times theorem prover too weak. 8175 trivial. 0 not checked. [2020-07-20 16:51:33,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1985190168] [2020-07-20 16:51:33,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:33,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:51:33,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352169258] [2020-07-20 16:51:33,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:51:33,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:33,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:51:33,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:51:33,665 INFO L87 Difference]: Start difference. First operand 501 states and 890 transitions. Second operand 18 states. [2020-07-20 16:51:34,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:34,026 INFO L93 Difference]: Finished difference Result 571 states and 1081 transitions. [2020-07-20 16:51:34,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:51:34,028 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 571 [2020-07-20 16:51:34,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:34,035 INFO L225 Difference]: With dead ends: 571 [2020-07-20 16:51:34,036 INFO L226 Difference]: Without dead ends: 567 [2020-07-20 16:51:34,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1147 GetRequests, 1113 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:51:34,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2020-07-20 16:51:34,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 501. [2020-07-20 16:51:34,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 501 states. [2020-07-20 16:51:34,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 890 transitions. [2020-07-20 16:51:34,060 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 890 transitions. Word has length 571 [2020-07-20 16:51:34,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:34,061 INFO L479 AbstractCegarLoop]: Abstraction has 501 states and 890 transitions. [2020-07-20 16:51:34,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:51:34,061 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 890 transitions. [2020-07-20 16:51:34,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 748 [2020-07-20 16:51:34,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:34,067 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 55, 55, 31, 31, 29, 29, 29, 29, 29, 29, 29, 27, 27, 27, 27, 27, 27, 27, 27, 24, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:34,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:34,268 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:34,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:34,269 INFO L82 PathProgramCache]: Analyzing trace with hash -531425849, now seen corresponding path program 38 times [2020-07-20 16:51:34,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:34,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674164464] [2020-07-20 16:51:34,270 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:34,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:51:34,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:34,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 1097 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:51:34,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:35,428 INFO L134 CoverageAnalysis]: Checked inductivity of 16510 backedges. 7775 proven. 1462 refuted. 0 times theorem prover too weak. 7273 trivial. 0 not checked. [2020-07-20 16:51:35,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:40,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:40,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:40,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:40,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:40,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:41,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:41,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:43,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:43,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:44,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:44,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:44,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:44,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:45,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:45,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:45,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:45,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:45,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:45,561 INFO L134 CoverageAnalysis]: Checked inductivity of 16510 backedges. 954 proven. 2577 refuted. 0 times theorem prover too weak. 12979 trivial. 0 not checked. [2020-07-20 16:51:45,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674164464] [2020-07-20 16:51:45,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:45,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:51:45,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947516395] [2020-07-20 16:51:45,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:51:45,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:45,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:51:45,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:51:45,564 INFO L87 Difference]: Start difference. First operand 501 states and 890 transitions. Second operand 31 states. [2020-07-20 16:51:47,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:47,785 INFO L93 Difference]: Finished difference Result 1059 states and 2054 transitions. [2020-07-20 16:51:47,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 16:51:47,787 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 747 [2020-07-20 16:51:47,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:47,794 INFO L225 Difference]: With dead ends: 1059 [2020-07-20 16:51:47,794 INFO L226 Difference]: Without dead ends: 554 [2020-07-20 16:51:47,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1518 GetRequests, 1439 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=484, Invalid=2596, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 16:51:47,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2020-07-20 16:51:47,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 481. [2020-07-20 16:51:47,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 481 states. [2020-07-20 16:51:47,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 792 transitions. [2020-07-20 16:51:47,818 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 792 transitions. Word has length 747 [2020-07-20 16:51:47,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:47,819 INFO L479 AbstractCegarLoop]: Abstraction has 481 states and 792 transitions. [2020-07-20 16:51:47,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:51:47,819 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 792 transitions. [2020-07-20 16:51:47,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 777 [2020-07-20 16:51:47,825 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:47,825 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 58, 58, 34, 33, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 26, 24, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:48,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:48,026 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:48,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:48,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1088947007, now seen corresponding path program 39 times [2020-07-20 16:51:48,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:48,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901364056] [2020-07-20 16:51:48,028 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:48,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:51:48,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:48,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 1136 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:51:48,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:49,410 INFO L134 CoverageAnalysis]: Checked inductivity of 17793 backedges. 2098 proven. 1152 refuted. 0 times theorem prover too weak. 14543 trivial. 0 not checked. [2020-07-20 16:51:49,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:53,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:54,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:55,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:58,116 INFO L134 CoverageAnalysis]: Checked inductivity of 17793 backedges. 2102 proven. 1174 refuted. 0 times theorem prover too weak. 14517 trivial. 0 not checked. [2020-07-20 16:51:58,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901364056] [2020-07-20 16:51:58,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:58,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:51:58,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972299238] [2020-07-20 16:51:58,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:51:58,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:58,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:51:58,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:51:58,118 INFO L87 Difference]: Start difference. First operand 481 states and 792 transitions. Second operand 29 states. [2020-07-20 16:52:00,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:00,383 INFO L93 Difference]: Finished difference Result 1141 states and 2007 transitions. [2020-07-20 16:52:00,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 16:52:00,385 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 776 [2020-07-20 16:52:00,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:00,392 INFO L225 Difference]: With dead ends: 1141 [2020-07-20 16:52:00,392 INFO L226 Difference]: Without dead ends: 539 [2020-07-20 16:52:00,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1577 GetRequests, 1501 SyntacticMatches, 23 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=462, Invalid=2508, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 16:52:00,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2020-07-20 16:52:00,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 490. [2020-07-20 16:52:00,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-20 16:52:00,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 809 transitions. [2020-07-20 16:52:00,419 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 809 transitions. Word has length 776 [2020-07-20 16:52:00,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:00,419 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 809 transitions. [2020-07-20 16:52:00,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:52:00,419 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 809 transitions. [2020-07-20 16:52:00,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-20 16:52:00,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:00,423 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 43, 43, 27, 27, 23, 23, 23, 23, 23, 23, 23, 21, 21, 21, 21, 21, 21, 21, 19, 16, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:00,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:00,625 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:00,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:00,625 INFO L82 PathProgramCache]: Analyzing trace with hash 826258093, now seen corresponding path program 40 times [2020-07-20 16:52:00,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:00,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207172458] [2020-07-20 16:52:00,626 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:01,409 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:01,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:01,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:52:01,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:01,739 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 475 proven. 830 refuted. 0 times theorem prover too weak. 9001 trivial. 0 not checked. [2020-07-20 16:52:01,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:04,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:05,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:05,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:05,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:05,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:05,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,819 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 475 proven. 848 refuted. 0 times theorem prover too weak. 8983 trivial. 0 not checked. [2020-07-20 16:52:06,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207172458] [2020-07-20 16:52:06,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:06,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:52:06,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97327240] [2020-07-20 16:52:06,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:52:06,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:06,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:52:06,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:52:06,821 INFO L87 Difference]: Start difference. First operand 490 states and 809 transitions. Second operand 18 states. [2020-07-20 16:52:07,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:07,191 INFO L93 Difference]: Finished difference Result 535 states and 907 transitions. [2020-07-20 16:52:07,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:52:07,193 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2020-07-20 16:52:07,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:07,199 INFO L225 Difference]: With dead ends: 535 [2020-07-20 16:52:07,199 INFO L226 Difference]: Without dead ends: 531 [2020-07-20 16:52:07,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1195 GetRequests, 1161 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:52:07,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2020-07-20 16:52:07,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 490. [2020-07-20 16:52:07,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-20 16:52:07,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 809 transitions. [2020-07-20 16:52:07,221 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 809 transitions. Word has length 595 [2020-07-20 16:52:07,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:07,221 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 809 transitions. [2020-07-20 16:52:07,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:52:07,222 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 809 transitions. [2020-07-20 16:52:07,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 620 [2020-07-20 16:52:07,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:07,226 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 27, 27, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 20, 19, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:07,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:07,427 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:07,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:07,428 INFO L82 PathProgramCache]: Analyzing trace with hash 686196571, now seen corresponding path program 41 times [2020-07-20 16:52:07,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:07,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413776968] [2020-07-20 16:52:07,429 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:08,307 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:08,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:08,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 1196 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:52:08,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:08,567 INFO L134 CoverageAnalysis]: Checked inductivity of 11190 backedges. 764 proven. 819 refuted. 0 times theorem prover too weak. 9607 trivial. 0 not checked. [2020-07-20 16:52:08,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:11,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:12,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:12,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:12,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:12,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:12,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:12,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:13,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:13,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:13,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:14,667 INFO L134 CoverageAnalysis]: Checked inductivity of 11190 backedges. 768 proven. 839 refuted. 0 times theorem prover too weak. 9583 trivial. 0 not checked. [2020-07-20 16:52:14,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413776968] [2020-07-20 16:52:14,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:14,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:52:14,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674718885] [2020-07-20 16:52:14,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:52:14,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:14,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:52:14,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:52:14,669 INFO L87 Difference]: Start difference. First operand 490 states and 809 transitions. Second operand 20 states. [2020-07-20 16:52:15,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:15,117 INFO L93 Difference]: Finished difference Result 530 states and 882 transitions. [2020-07-20 16:52:15,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:52:15,119 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 619 [2020-07-20 16:52:15,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:15,124 INFO L225 Difference]: With dead ends: 530 [2020-07-20 16:52:15,124 INFO L226 Difference]: Without dead ends: 526 [2020-07-20 16:52:15,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1244 GetRequests, 1205 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:52:15,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2020-07-20 16:52:15,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 490. [2020-07-20 16:52:15,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-20 16:52:15,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 809 transitions. [2020-07-20 16:52:15,148 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 809 transitions. Word has length 619 [2020-07-20 16:52:15,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:15,148 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 809 transitions. [2020-07-20 16:52:15,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:52:15,148 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 809 transitions. [2020-07-20 16:52:15,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-20 16:52:15,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:15,154 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 43, 43, 27, 27, 23, 23, 23, 23, 23, 23, 23, 21, 21, 21, 21, 21, 21, 21, 19, 16, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:15,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:15,364 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:15,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:15,365 INFO L82 PathProgramCache]: Analyzing trace with hash -484967059, now seen corresponding path program 42 times [2020-07-20 16:52:15,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:15,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760985331] [2020-07-20 16:52:15,366 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:16,170 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:16,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:16,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:52:16,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:16,394 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 667 proven. 640 refuted. 0 times theorem prover too weak. 8999 trivial. 0 not checked. [2020-07-20 16:52:16,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:19,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:19,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:19,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:19,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:19,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:19,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:21,575 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 669 proven. 654 refuted. 0 times theorem prover too weak. 8983 trivial. 0 not checked. [2020-07-20 16:52:21,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760985331] [2020-07-20 16:52:21,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:21,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:52:21,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612298745] [2020-07-20 16:52:21,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:52:21,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:21,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:52:21,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:52:21,577 INFO L87 Difference]: Start difference. First operand 490 states and 809 transitions. Second operand 18 states. [2020-07-20 16:52:21,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:21,970 INFO L93 Difference]: Finished difference Result 500 states and 825 transitions. [2020-07-20 16:52:21,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:52:21,972 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2020-07-20 16:52:21,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:21,977 INFO L225 Difference]: With dead ends: 500 [2020-07-20 16:52:21,978 INFO L226 Difference]: Without dead ends: 496 [2020-07-20 16:52:21,978 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1195 GetRequests, 1161 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:52:21,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-20 16:52:21,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 485. [2020-07-20 16:52:21,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 485 states. [2020-07-20 16:52:21,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 799 transitions. [2020-07-20 16:52:21,999 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 799 transitions. Word has length 595 [2020-07-20 16:52:22,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:22,000 INFO L479 AbstractCegarLoop]: Abstraction has 485 states and 799 transitions. [2020-07-20 16:52:22,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:52:22,000 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 799 transitions. [2020-07-20 16:52:22,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 608 [2020-07-20 16:52:22,005 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:22,006 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 45, 45, 27, 27, 23, 23, 23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 22, 22, 19, 18, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:22,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:22,216 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:22,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:22,216 INFO L82 PathProgramCache]: Analyzing trace with hash 1456470758, now seen corresponding path program 43 times [2020-07-20 16:52:22,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:22,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805919694] [2020-07-20 16:52:22,217 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:23,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:23,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:23,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:52:23,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:23,317 INFO L134 CoverageAnalysis]: Checked inductivity of 10738 backedges. 701 proven. 630 refuted. 0 times theorem prover too weak. 9407 trivial. 0 not checked. [2020-07-20 16:52:23,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:26,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:26,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:26,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:27,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:27,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:27,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:27,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:27,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:28,916 INFO L134 CoverageAnalysis]: Checked inductivity of 10738 backedges. 701 proven. 648 refuted. 0 times theorem prover too weak. 9389 trivial. 0 not checked. [2020-07-20 16:52:28,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805919694] [2020-07-20 16:52:28,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:28,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:52:28,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935035220] [2020-07-20 16:52:28,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:52:28,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:28,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:52:28,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:52:28,918 INFO L87 Difference]: Start difference. First operand 485 states and 799 transitions. Second operand 18 states. [2020-07-20 16:52:29,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:29,295 INFO L93 Difference]: Finished difference Result 556 states and 934 transitions. [2020-07-20 16:52:29,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:52:29,297 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 607 [2020-07-20 16:52:29,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:29,302 INFO L225 Difference]: With dead ends: 556 [2020-07-20 16:52:29,302 INFO L226 Difference]: Without dead ends: 552 [2020-07-20 16:52:29,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1219 GetRequests, 1185 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:52:29,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2020-07-20 16:52:29,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 485. [2020-07-20 16:52:29,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 485 states. [2020-07-20 16:52:29,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 799 transitions. [2020-07-20 16:52:29,326 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 799 transitions. Word has length 607 [2020-07-20 16:52:29,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:29,327 INFO L479 AbstractCegarLoop]: Abstraction has 485 states and 799 transitions. [2020-07-20 16:52:29,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:52:29,327 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 799 transitions. [2020-07-20 16:52:29,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 632 [2020-07-20 16:52:29,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:29,332 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 46, 46, 27, 27, 24, 24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 22, 19, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:29,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:29,533 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:29,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:29,534 INFO L82 PathProgramCache]: Analyzing trace with hash 590121926, now seen corresponding path program 44 times [2020-07-20 16:52:29,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:29,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557232816] [2020-07-20 16:52:29,535 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:30,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:30,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:30,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 1220 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:52:30,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 11662 backedges. 768 proven. 617 refuted. 0 times theorem prover too weak. 10277 trivial. 0 not checked. [2020-07-20 16:52:30,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:33,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:33,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:34,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:34,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:34,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:34,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:34,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:34,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:34,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:35,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:35,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:36,694 INFO L134 CoverageAnalysis]: Checked inductivity of 11662 backedges. 772 proven. 629 refuted. 0 times theorem prover too weak. 10261 trivial. 0 not checked. [2020-07-20 16:52:36,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557232816] [2020-07-20 16:52:36,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:36,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:52:36,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703392492] [2020-07-20 16:52:36,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:52:36,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:36,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:52:36,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:52:36,696 INFO L87 Difference]: Start difference. First operand 485 states and 799 transitions. Second operand 18 states. [2020-07-20 16:52:37,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:37,123 INFO L93 Difference]: Finished difference Result 494 states and 813 transitions. [2020-07-20 16:52:37,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:52:37,125 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 631 [2020-07-20 16:52:37,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:37,129 INFO L225 Difference]: With dead ends: 494 [2020-07-20 16:52:37,130 INFO L226 Difference]: Without dead ends: 490 [2020-07-20 16:52:37,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1267 GetRequests, 1233 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:52:37,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-20 16:52:37,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 460. [2020-07-20 16:52:37,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 460 states. [2020-07-20 16:52:37,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 728 transitions. [2020-07-20 16:52:37,149 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 728 transitions. Word has length 631 [2020-07-20 16:52:37,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:37,150 INFO L479 AbstractCegarLoop]: Abstraction has 460 states and 728 transitions. [2020-07-20 16:52:37,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:52:37,150 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 728 transitions. [2020-07-20 16:52:37,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 725 [2020-07-20 16:52:37,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:37,157 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 50, 50, 38, 37, 28, 28, 28, 28, 28, 28, 28, 25, 25, 25, 25, 25, 25, 25, 19, 13, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:37,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:37,370 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:37,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:37,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1927816774, now seen corresponding path program 45 times [2020-07-20 16:52:37,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:37,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1619184460] [2020-07-20 16:52:37,372 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:38,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:38,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:38,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 1074 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:52:38,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:38,870 INFO L134 CoverageAnalysis]: Checked inductivity of 15365 backedges. 1694 proven. 2266 refuted. 0 times theorem prover too weak. 11405 trivial. 0 not checked. [2020-07-20 16:52:38,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:43,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:43,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:44,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:44,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:44,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:44,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:44,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:44,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:45,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:45,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:45,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:49,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:49,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:51,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:53,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:53,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:53,417 INFO L134 CoverageAnalysis]: Checked inductivity of 15365 backedges. 1694 proven. 2320 refuted. 0 times theorem prover too weak. 11351 trivial. 0 not checked. [2020-07-20 16:52:53,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1619184460] [2020-07-20 16:52:53,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:53,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 37 [2020-07-20 16:52:53,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458172916] [2020-07-20 16:52:53,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:52:53,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:53,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:52:53,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:52:53,419 INFO L87 Difference]: Start difference. First operand 460 states and 728 transitions. Second operand 37 states. [2020-07-20 16:52:56,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:56,581 INFO L93 Difference]: Finished difference Result 971 states and 1645 transitions. [2020-07-20 16:52:56,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 16:52:56,582 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 724 [2020-07-20 16:52:56,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:56,587 INFO L225 Difference]: With dead ends: 971 [2020-07-20 16:52:56,587 INFO L226 Difference]: Without dead ends: 516 [2020-07-20 16:52:56,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1478 GetRequests, 1381 SyntacticMatches, 31 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=665, Invalid=3891, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 16:52:56,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2020-07-20 16:52:56,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 413. [2020-07-20 16:52:56,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-07-20 16:52:56,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 647 transitions. [2020-07-20 16:52:56,611 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 647 transitions. Word has length 724 [2020-07-20 16:52:56,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:56,611 INFO L479 AbstractCegarLoop]: Abstraction has 413 states and 647 transitions. [2020-07-20 16:52:56,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:52:56,612 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 647 transitions. [2020-07-20 16:52:56,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1373 [2020-07-20 16:52:56,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:56,625 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 96, 96, 69, 66, 54, 54, 54, 54, 54, 54, 54, 48, 48, 48, 48, 48, 48, 48, 40, 30, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:56,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:56,826 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:56,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:56,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1026963961, now seen corresponding path program 46 times [2020-07-20 16:52:56,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:56,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040574398] [2020-07-20 16:52:56,828 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:57,845 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:52:57,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:57,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 1079 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:52:57,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:58,852 INFO L134 CoverageAnalysis]: Checked inductivity of 56511 backedges. 29579 proven. 2175 refuted. 0 times theorem prover too weak. 24757 trivial. 0 not checked. [2020-07-20 16:52:58,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:10,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:14,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:15,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:15,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:16,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:16,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:16,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:16,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:16,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:16,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,584 INFO L134 CoverageAnalysis]: Checked inductivity of 56511 backedges. 1427 proven. 6008 refuted. 0 times theorem prover too weak. 49076 trivial. 0 not checked. [2020-07-20 16:53:17,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040574398] [2020-07-20 16:53:17,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:17,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 16:53:17,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682882921] [2020-07-20 16:53:17,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:53:17,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:17,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:53:17,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:53:17,587 INFO L87 Difference]: Start difference. First operand 413 states and 647 transitions. Second operand 33 states. [2020-07-20 16:53:20,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:20,894 INFO L93 Difference]: Finished difference Result 991 states and 1658 transitions. [2020-07-20 16:53:20,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 16:53:20,896 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1372 [2020-07-20 16:53:20,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:20,902 INFO L225 Difference]: With dead ends: 991 [2020-07-20 16:53:20,902 INFO L226 Difference]: Without dead ends: 506 [2020-07-20 16:53:20,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2773 GetRequests, 2685 SyntacticMatches, 27 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 846 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=595, Invalid=3311, Unknown=0, NotChecked=0, Total=3906 [2020-07-20 16:53:20,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2020-07-20 16:53:20,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 422. [2020-07-20 16:53:20,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 422 states. [2020-07-20 16:53:20,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 663 transitions. [2020-07-20 16:53:20,927 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 663 transitions. Word has length 1372 [2020-07-20 16:53:20,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:20,927 INFO L479 AbstractCegarLoop]: Abstraction has 422 states and 663 transitions. [2020-07-20 16:53:20,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:53:20,927 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 663 transitions. [2020-07-20 16:53:20,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1155 [2020-07-20 16:53:20,936 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:20,937 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 78, 78, 55, 54, 47, 47, 47, 47, 47, 47, 47, 40, 39, 39, 39, 39, 39, 39, 39, 24, 16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:21,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:21,139 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:21,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:21,141 INFO L82 PathProgramCache]: Analyzing trace with hash 845693623, now seen corresponding path program 47 times [2020-07-20 16:53:21,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:21,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880557725] [2020-07-20 16:53:21,142 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:22,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:22,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:22,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 1707 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-20 16:53:22,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:23,242 INFO L134 CoverageAnalysis]: Checked inductivity of 40076 backedges. 2390 proven. 4760 refuted. 0 times theorem prover too weak. 32926 trivial. 0 not checked. [2020-07-20 16:53:23,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:31,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:31,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:33,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:33,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:34,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:34,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:41,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:41,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:42,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:43,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:44,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:44,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:44,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,856 INFO L134 CoverageAnalysis]: Checked inductivity of 40076 backedges. 2390 proven. 4826 refuted. 0 times theorem prover too weak. 32860 trivial. 0 not checked. [2020-07-20 16:53:45,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880557725] [2020-07-20 16:53:45,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:45,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 35] total 39 [2020-07-20 16:53:45,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800238166] [2020-07-20 16:53:45,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 16:53:45,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:45,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 16:53:45,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:53:45,859 INFO L87 Difference]: Start difference. First operand 422 states and 663 transitions. Second operand 39 states. [2020-07-20 16:53:51,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:51,112 INFO L93 Difference]: Finished difference Result 965 states and 1700 transitions. [2020-07-20 16:53:51,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 16:53:51,115 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1154 [2020-07-20 16:53:51,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:51,123 INFO L225 Difference]: With dead ends: 965 [2020-07-20 16:53:51,123 INFO L226 Difference]: Without dead ends: 543 [2020-07-20 16:53:51,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2348 GetRequests, 2237 SyntacticMatches, 33 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1529 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=911, Invalid=5409, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 16:53:51,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2020-07-20 16:53:51,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 459. [2020-07-20 16:53:51,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 459 states. [2020-07-20 16:53:51,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 723 transitions. [2020-07-20 16:53:51,156 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 723 transitions. Word has length 1154 [2020-07-20 16:53:51,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:51,157 INFO L479 AbstractCegarLoop]: Abstraction has 459 states and 723 transitions. [2020-07-20 16:53:51,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 16:53:51,157 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 723 transitions. [2020-07-20 16:53:51,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 894 [2020-07-20 16:53:51,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:51,167 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 66, 66, 44, 44, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 23, 22, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:51,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:51,376 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:51,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:51,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1687938849, now seen corresponding path program 48 times [2020-07-20 16:53:51,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:51,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103258173] [2020-07-20 16:53:51,379 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:52,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:52,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:52,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 1725 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:53:52,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:53,010 INFO L134 CoverageAnalysis]: Checked inductivity of 23540 backedges. 407 proven. 2618 refuted. 0 times theorem prover too weak. 20515 trivial. 0 not checked. [2020-07-20 16:53:53,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:00,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:00,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:04,084 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:54:04,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:04,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:05,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:05,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:06,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:06,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:08,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:08,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:08,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:08,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:08,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:08,827 INFO L134 CoverageAnalysis]: Checked inductivity of 23540 backedges. 407 proven. 2662 refuted. 0 times theorem prover too weak. 20471 trivial. 0 not checked. [2020-07-20 16:54:08,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2103258173] [2020-07-20 16:54:08,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:08,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 16:54:08,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611302369] [2020-07-20 16:54:08,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 16:54:08,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:08,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 16:54:08,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:54:08,830 INFO L87 Difference]: Start difference. First operand 459 states and 723 transitions. Second operand 24 states. [2020-07-20 16:54:09,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:09,646 INFO L93 Difference]: Finished difference Result 484 states and 760 transitions. [2020-07-20 16:54:09,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:54:09,648 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 893 [2020-07-20 16:54:09,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:09,653 INFO L225 Difference]: With dead ends: 484 [2020-07-20 16:54:09,653 INFO L226 Difference]: Without dead ends: 480 [2020-07-20 16:54:09,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1794 GetRequests, 1745 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:54:09,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 480 states. [2020-07-20 16:54:09,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 480 to 459. [2020-07-20 16:54:09,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 459 states. [2020-07-20 16:54:09,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 723 transitions. [2020-07-20 16:54:09,673 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 723 transitions. Word has length 893 [2020-07-20 16:54:09,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:09,674 INFO L479 AbstractCegarLoop]: Abstraction has 459 states and 723 transitions. [2020-07-20 16:54:09,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 16:54:09,675 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 723 transitions. [2020-07-20 16:54:09,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1289 [2020-07-20 16:54:09,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:09,687 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 94, 94, 69, 66, 48, 48, 48, 48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 47, 28, 28, 22, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:09,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:09,888 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:09,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:09,889 INFO L82 PathProgramCache]: Analyzing trace with hash -146641730, now seen corresponding path program 49 times [2020-07-20 16:54:09,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:09,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970249637] [2020-07-20 16:54:09,889 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:10,999 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:54:10,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:11,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 1017 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:54:11,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:12,107 INFO L134 CoverageAnalysis]: Checked inductivity of 49435 backedges. 26106 proven. 1907 refuted. 0 times theorem prover too weak. 21422 trivial. 0 not checked. [2020-07-20 16:54:12,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:26,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:27,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:27,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:31,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:31,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:34,194 INFO L134 CoverageAnalysis]: Checked inductivity of 49435 backedges. 1473 proven. 5481 refuted. 0 times theorem prover too weak. 42481 trivial. 0 not checked. [2020-07-20 16:54:34,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970249637] [2020-07-20 16:54:34,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:34,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 16:54:34,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490505638] [2020-07-20 16:54:34,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:54:34,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:34,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:54:34,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:54:34,197 INFO L87 Difference]: Start difference. First operand 459 states and 723 transitions. Second operand 33 states. [2020-07-20 16:54:38,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:38,553 INFO L93 Difference]: Finished difference Result 1148 states and 1889 transitions. [2020-07-20 16:54:38,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-20 16:54:38,557 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1288 [2020-07-20 16:54:38,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:38,563 INFO L225 Difference]: With dead ends: 1148 [2020-07-20 16:54:38,563 INFO L226 Difference]: Without dead ends: 609 [2020-07-20 16:54:38,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2607 GetRequests, 2517 SyntacticMatches, 27 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=635, Invalid=3525, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 16:54:38,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2020-07-20 16:54:38,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 512. [2020-07-20 16:54:38,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-07-20 16:54:38,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 807 transitions. [2020-07-20 16:54:38,587 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 807 transitions. Word has length 1288 [2020-07-20 16:54:38,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:38,587 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 807 transitions. [2020-07-20 16:54:38,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:54:38,587 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 807 transitions. [2020-07-20 16:54:38,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1337 [2020-07-20 16:54:38,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:38,602 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 98, 98, 69, 66, 50, 50, 50, 50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 49, 32, 32, 20, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:38,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:38,803 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:38,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:38,805 INFO L82 PathProgramCache]: Analyzing trace with hash -446214978, now seen corresponding path program 50 times [2020-07-20 16:54:38,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:38,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1801150382] [2020-07-20 16:54:38,806 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:39,937 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:54:39,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:39,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:54:39,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:41,019 INFO L134 CoverageAnalysis]: Checked inductivity of 53307 backedges. 28060 proven. 1798 refuted. 0 times theorem prover too weak. 23449 trivial. 0 not checked. [2020-07-20 16:54:41,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:55,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:55,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:00,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:00,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:02,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:02,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:02,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:02,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:03,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,005 INFO L134 CoverageAnalysis]: Checked inductivity of 53307 backedges. 1498 proven. 5209 refuted. 0 times theorem prover too weak. 46600 trivial. 0 not checked. [2020-07-20 16:55:04,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1801150382] [2020-07-20 16:55:04,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:04,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:55:04,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924165449] [2020-07-20 16:55:04,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:55:04,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:04,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:55:04,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:55:04,008 INFO L87 Difference]: Start difference. First operand 512 states and 807 transitions. Second operand 31 states. [2020-07-20 16:55:08,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:08,338 INFO L93 Difference]: Finished difference Result 1326 states and 2278 transitions. [2020-07-20 16:55:08,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 16:55:08,342 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1336 [2020-07-20 16:55:08,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:08,350 INFO L225 Difference]: With dead ends: 1326 [2020-07-20 16:55:08,351 INFO L226 Difference]: Without dead ends: 794 [2020-07-20 16:55:08,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2700 GetRequests, 2617 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 16:55:08,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2020-07-20 16:55:08,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 525. [2020-07-20 16:55:08,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 525 states. [2020-07-20 16:55:08,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 833 transitions. [2020-07-20 16:55:08,381 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 833 transitions. Word has length 1336 [2020-07-20 16:55:08,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:08,381 INFO L479 AbstractCegarLoop]: Abstraction has 525 states and 833 transitions. [2020-07-20 16:55:08,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:55:08,381 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 833 transitions. [2020-07-20 16:55:08,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 987 [2020-07-20 16:55:08,389 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:08,390 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 72, 72, 55, 54, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:08,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:08,591 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:08,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:08,591 INFO L82 PathProgramCache]: Analyzing trace with hash -33521835, now seen corresponding path program 51 times [2020-07-20 16:55:08,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:08,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216442201] [2020-07-20 16:55:08,592 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:09,779 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:09,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:09,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 1471 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:55:09,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 28692 backedges. 2239 proven. 3419 refuted. 0 times theorem prover too weak. 23034 trivial. 0 not checked. [2020-07-20 16:55:10,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:20,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:20,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:22,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:25,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:25,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:30,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:30,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:32,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:33,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:33,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:33,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:35,480 INFO L134 CoverageAnalysis]: Checked inductivity of 28692 backedges. 2241 proven. 3474 refuted. 0 times theorem prover too weak. 22977 trivial. 0 not checked. [2020-07-20 16:55:35,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216442201] [2020-07-20 16:55:35,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:35,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 37 [2020-07-20 16:55:35,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532353553] [2020-07-20 16:55:35,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:55:35,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:35,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:55:35,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:55:35,483 INFO L87 Difference]: Start difference. First operand 525 states and 833 transitions. Second operand 37 states. [2020-07-20 16:55:42,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:42,069 INFO L93 Difference]: Finished difference Result 1180 states and 2106 transitions. [2020-07-20 16:55:42,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 16:55:42,073 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 986 [2020-07-20 16:55:42,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:42,083 INFO L225 Difference]: With dead ends: 1180 [2020-07-20 16:55:42,083 INFO L226 Difference]: Without dead ends: 624 [2020-07-20 16:55:42,087 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2009 GetRequests, 1905 SyntacticMatches, 31 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1320 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=797, Invalid=4753, Unknown=0, NotChecked=0, Total=5550 [2020-07-20 16:55:42,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2020-07-20 16:55:42,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 534. [2020-07-20 16:55:42,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 534 states. [2020-07-20 16:55:42,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 837 transitions. [2020-07-20 16:55:42,112 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 837 transitions. Word has length 986 [2020-07-20 16:55:42,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:42,112 INFO L479 AbstractCegarLoop]: Abstraction has 534 states and 837 transitions. [2020-07-20 16:55:42,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:55:42,113 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 837 transitions. [2020-07-20 16:55:42,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 762 [2020-07-20 16:55:42,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:42,121 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 44, 44, 28, 28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 27, 17, 16, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:42,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:42,334 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:42,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:42,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1244461962, now seen corresponding path program 52 times [2020-07-20 16:55:42,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:42,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023539267] [2020-07-20 16:55:42,336 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:43,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:43,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:43,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 1470 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:55:43,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:44,044 INFO L134 CoverageAnalysis]: Checked inductivity of 16908 backedges. 379 proven. 1900 refuted. 0 times theorem prover too weak. 14629 trivial. 0 not checked. [2020-07-20 16:55:44,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:47,136 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:55:52,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:52,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:59,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:59,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:59,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:59,894 INFO L134 CoverageAnalysis]: Checked inductivity of 16908 backedges. 379 proven. 1933 refuted. 0 times theorem prover too weak. 14596 trivial. 0 not checked. [2020-07-20 16:55:59,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023539267] [2020-07-20 16:55:59,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:59,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 16:55:59,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106578352] [2020-07-20 16:55:59,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:55:59,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:59,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:55:59,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:55:59,897 INFO L87 Difference]: Start difference. First operand 534 states and 837 transitions. Second operand 22 states. [2020-07-20 16:56:00,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:00,816 INFO L93 Difference]: Finished difference Result 568 states and 903 transitions. [2020-07-20 16:56:00,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:56:00,821 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 761 [2020-07-20 16:56:00,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:00,826 INFO L225 Difference]: With dead ends: 568 [2020-07-20 16:56:00,826 INFO L226 Difference]: Without dead ends: 564 [2020-07-20 16:56:00,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1529 GetRequests, 1485 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:56:00,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2020-07-20 16:56:00,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 546. [2020-07-20 16:56:00,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 546 states. [2020-07-20 16:56:00,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 546 states to 546 states and 861 transitions. [2020-07-20 16:56:00,851 INFO L78 Accepts]: Start accepts. Automaton has 546 states and 861 transitions. Word has length 761 [2020-07-20 16:56:00,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:00,852 INFO L479 AbstractCegarLoop]: Abstraction has 546 states and 861 transitions. [2020-07-20 16:56:00,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:56:00,852 INFO L276 IsEmpty]: Start isEmpty. Operand 546 states and 861 transitions. [2020-07-20 16:56:00,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 846 [2020-07-20 16:56:00,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:00,859 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 57, 57, 44, 44, 34, 34, 34, 34, 34, 34, 34, 28, 28, 28, 28, 28, 28, 28, 24, 16, 13, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:01,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:01,059 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:01,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:01,060 INFO L82 PathProgramCache]: Analyzing trace with hash 2071418211, now seen corresponding path program 53 times [2020-07-20 16:56:01,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:01,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569515690] [2020-07-20 16:56:01,062 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:02,350 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:02,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:02,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 1632 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:02,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:02,937 INFO L134 CoverageAnalysis]: Checked inductivity of 21144 backedges. 447 proven. 2108 refuted. 0 times theorem prover too weak. 18589 trivial. 0 not checked. [2020-07-20 16:56:02,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:11,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:14,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:14,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,992 INFO L134 CoverageAnalysis]: Checked inductivity of 21144 backedges. 447 proven. 2141 refuted. 0 times theorem prover too weak. 18556 trivial. 0 not checked. [2020-07-20 16:56:18,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569515690] [2020-07-20 16:56:18,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:18,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 16:56:18,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966309676] [2020-07-20 16:56:18,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:56:18,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:18,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:56:18,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:56:18,994 INFO L87 Difference]: Start difference. First operand 546 states and 861 transitions. Second operand 22 states. [2020-07-20 16:56:19,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:19,795 INFO L93 Difference]: Finished difference Result 658 states and 1069 transitions. [2020-07-20 16:56:19,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:56:19,799 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 845 [2020-07-20 16:56:19,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:19,805 INFO L225 Difference]: With dead ends: 658 [2020-07-20 16:56:19,805 INFO L226 Difference]: Without dead ends: 654 [2020-07-20 16:56:19,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1697 GetRequests, 1653 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:56:19,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2020-07-20 16:56:19,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 544. [2020-07-20 16:56:19,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-20 16:56:19,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 858 transitions. [2020-07-20 16:56:19,841 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 858 transitions. Word has length 845 [2020-07-20 16:56:19,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:19,842 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 858 transitions. [2020-07-20 16:56:19,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:56:19,842 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 858 transitions. [2020-07-20 16:56:19,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 846 [2020-07-20 16:56:19,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:19,852 INFO L422 BasicCegarLoop]: trace histogram [63, 63, 62, 62, 44, 44, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 19, 18, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:20,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:20,067 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:20,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:20,067 INFO L82 PathProgramCache]: Analyzing trace with hash 999986035, now seen corresponding path program 54 times [2020-07-20 16:56:20,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:20,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813286976] [2020-07-20 16:56:20,068 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:22,089 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:22,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:22,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 1633 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:22,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:22,596 INFO L134 CoverageAnalysis]: Checked inductivity of 20988 backedges. 519 proven. 2024 refuted. 0 times theorem prover too weak. 18445 trivial. 0 not checked. [2020-07-20 16:56:22,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:30,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:36,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:37,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:37,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:37,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:37,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:37,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:37,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,687 INFO L134 CoverageAnalysis]: Checked inductivity of 20988 backedges. 521 proven. 2055 refuted. 0 times theorem prover too weak. 18412 trivial. 0 not checked. [2020-07-20 16:56:38,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813286976] [2020-07-20 16:56:38,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:38,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 16:56:38,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983679880] [2020-07-20 16:56:38,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:56:38,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:38,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:56:38,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:56:38,689 INFO L87 Difference]: Start difference. First operand 544 states and 858 transitions. Second operand 22 states. [2020-07-20 16:56:39,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:39,581 INFO L93 Difference]: Finished difference Result 553 states and 873 transitions. [2020-07-20 16:56:39,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:56:39,585 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 845 [2020-07-20 16:56:39,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:39,590 INFO L225 Difference]: With dead ends: 553 [2020-07-20 16:56:39,590 INFO L226 Difference]: Without dead ends: 549 [2020-07-20 16:56:39,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1697 GetRequests, 1653 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:56:39,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2020-07-20 16:56:39,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 534. [2020-07-20 16:56:39,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 534 states. [2020-07-20 16:56:39,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 837 transitions. [2020-07-20 16:56:39,611 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 837 transitions. Word has length 845 [2020-07-20 16:56:39,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:39,611 INFO L479 AbstractCegarLoop]: Abstraction has 534 states and 837 transitions. [2020-07-20 16:56:39,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:56:39,611 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 837 transitions. [2020-07-20 16:56:39,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1916 [2020-07-20 16:56:39,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:39,633 INFO L422 BasicCegarLoop]: trace histogram [159, 159, 126, 126, 99, 99, 79, 79, 79, 79, 79, 79, 79, 63, 63, 63, 63, 63, 63, 63, 60, 36, 27, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:39,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:39,834 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:39,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:39,836 INFO L82 PathProgramCache]: Analyzing trace with hash -554218495, now seen corresponding path program 55 times [2020-07-20 16:56:39,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:39,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582018593] [2020-07-20 16:56:39,837 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:41,200 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:56:41,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:41,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 1514 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 16:56:41,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:43,135 INFO L134 CoverageAnalysis]: Checked inductivity of 111582 backedges. 48351 proven. 6580 refuted. 0 times theorem prover too weak. 56651 trivial. 0 not checked. [2020-07-20 16:56:43,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:09,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:12,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:12,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:16,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:16,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:26,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:26,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:27,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:27,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:27,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:27,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:28,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:28,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:28,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,729 INFO L134 CoverageAnalysis]: Checked inductivity of 111582 backedges. 2996 proven. 10559 refuted. 0 times theorem prover too weak. 98027 trivial. 0 not checked. [2020-07-20 16:57:29,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582018593] [2020-07-20 16:57:29,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:29,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 37] total 43 [2020-07-20 16:57:29,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351219069] [2020-07-20 16:57:29,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 16:57:29,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:29,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 16:57:29,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1627, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 16:57:29,732 INFO L87 Difference]: Start difference. First operand 534 states and 837 transitions. Second operand 43 states. [2020-07-20 16:57:37,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:37,753 INFO L93 Difference]: Finished difference Result 1307 states and 2313 transitions. [2020-07-20 16:57:37,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-07-20 16:57:37,757 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 1915 [2020-07-20 16:57:37,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:37,765 INFO L225 Difference]: With dead ends: 1307 [2020-07-20 16:57:37,765 INFO L226 Difference]: Without dead ends: 771 [2020-07-20 16:57:37,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3873 GetRequests, 3755 SyntacticMatches, 33 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1831 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1038, Invalid=6444, Unknown=0, NotChecked=0, Total=7482 [2020-07-20 16:57:37,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2020-07-20 16:57:37,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 644. [2020-07-20 16:57:37,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 644 states. [2020-07-20 16:57:37,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 1115 transitions. [2020-07-20 16:57:37,811 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 1115 transitions. Word has length 1915 [2020-07-20 16:57:37,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:37,812 INFO L479 AbstractCegarLoop]: Abstraction has 644 states and 1115 transitions. [2020-07-20 16:57:37,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 16:57:37,812 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 1115 transitions. [2020-07-20 16:57:37,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1341 [2020-07-20 16:57:37,834 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:37,835 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 96, 96, 76, 75, 50, 50, 50, 50, 50, 50, 50, 48, 48, 48, 48, 48, 48, 48, 27, 26, 26, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:38,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:38,049 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:38,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:38,049 INFO L82 PathProgramCache]: Analyzing trace with hash -714395499, now seen corresponding path program 56 times [2020-07-20 16:57:38,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:38,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673293335] [2020-07-20 16:57:38,050 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:39,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:39,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:39,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 1996 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:57:39,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:40,668 INFO L134 CoverageAnalysis]: Checked inductivity of 53477 backedges. 28439 proven. 1998 refuted. 0 times theorem prover too weak. 23040 trivial. 0 not checked. [2020-07-20 16:57:40,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:59,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:02,343 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 16:58:04,013 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:58:08,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:10,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:14,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:14,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:14,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:15,015 INFO L134 CoverageAnalysis]: Checked inductivity of 53477 backedges. 1788 proven. 5968 refuted. 0 times theorem prover too weak. 45721 trivial. 0 not checked. [2020-07-20 16:58:15,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673293335] [2020-07-20 16:58:15,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:15,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-20 16:58:15,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725907309] [2020-07-20 16:58:15,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 16:58:15,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:15,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 16:58:15,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1056, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:58:15,018 INFO L87 Difference]: Start difference. First operand 644 states and 1115 transitions. Second operand 35 states. [2020-07-20 16:58:21,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:21,302 INFO L93 Difference]: Finished difference Result 1366 states and 2475 transitions. [2020-07-20 16:58:21,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 16:58:21,307 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1340 [2020-07-20 16:58:21,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:21,315 INFO L225 Difference]: With dead ends: 1366 [2020-07-20 16:58:21,315 INFO L226 Difference]: Without dead ends: 728 [2020-07-20 16:58:21,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2709 GetRequests, 2617 SyntacticMatches, 29 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=622, Invalid=3538, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 16:58:21,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 728 states. [2020-07-20 16:58:21,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 728 to 680. [2020-07-20 16:58:21,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-07-20 16:58:21,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 1235 transitions. [2020-07-20 16:58:21,347 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 1235 transitions. Word has length 1340 [2020-07-20 16:58:21,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:21,348 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 1235 transitions. [2020-07-20 16:58:21,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 16:58:21,348 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 1235 transitions. [2020-07-20 16:58:21,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-20 16:58:21,359 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:21,359 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 92, 92, 65, 65, 47, 47, 47, 47, 47, 47, 47, 46, 46, 46, 46, 46, 46, 46, 30, 27, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:21,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:21,560 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:21,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:21,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1020862412, now seen corresponding path program 57 times [2020-07-20 16:58:21,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:21,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [693005935] [2020-07-20 16:58:21,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:23,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:23,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:23,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 1865 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:58:23,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:24,330 INFO L134 CoverageAnalysis]: Checked inductivity of 47228 backedges. 24798 proven. 2305 refuted. 0 times theorem prover too weak. 20125 trivial. 0 not checked. [2020-07-20 16:58:24,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:45,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:45,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:46,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:46,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:47,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:51,971 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:58:57,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:00,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:00,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:02,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:02,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:03,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:03,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:04,185 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 16:59:04,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:04,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:04,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:04,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,774 INFO L134 CoverageAnalysis]: Checked inductivity of 47228 backedges. 2115 proven. 5553 refuted. 0 times theorem prover too weak. 39560 trivial. 0 not checked. [2020-07-20 16:59:05,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [693005935] [2020-07-20 16:59:05,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:05,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 37 [2020-07-20 16:59:05,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686304483] [2020-07-20 16:59:05,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:59:05,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:05,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:59:05,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:59:05,777 INFO L87 Difference]: Start difference. First operand 680 states and 1235 transitions. Second operand 37 states. [2020-07-20 16:59:12,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:12,467 INFO L93 Difference]: Finished difference Result 1384 states and 2533 transitions. [2020-07-20 16:59:12,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 16:59:12,472 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 1259 [2020-07-20 16:59:12,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:12,480 INFO L225 Difference]: With dead ends: 1384 [2020-07-20 16:59:12,480 INFO L226 Difference]: Without dead ends: 710 [2020-07-20 16:59:12,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2548 GetRequests, 2451 SyntacticMatches, 31 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=665, Invalid=3891, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 16:59:12,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 710 states. [2020-07-20 16:59:12,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 710 to 680. [2020-07-20 16:59:12,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-07-20 16:59:12,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 1220 transitions. [2020-07-20 16:59:12,515 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 1220 transitions. Word has length 1259 [2020-07-20 16:59:12,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:12,516 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 1220 transitions. [2020-07-20 16:59:12,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:59:12,516 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 1220 transitions. [2020-07-20 16:59:12,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1132 [2020-07-20 16:59:12,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:12,526 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 61, 61, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 27, 22, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:12,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:12,727 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:12,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:12,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1720425702, now seen corresponding path program 58 times [2020-07-20 16:59:12,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:12,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268073576] [2020-07-20 16:59:12,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:14,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:59:14,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:14,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 1680 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-20 16:59:14,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:15,653 INFO L134 CoverageAnalysis]: Checked inductivity of 38044 backedges. 2923 proven. 4078 refuted. 0 times theorem prover too weak. 31043 trivial. 0 not checked. [2020-07-20 16:59:15,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:18,395 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:59:18,504 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:59:18,612 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:59:19,534 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:59:19,648 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:59:19,766 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:59:19,890 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:59:26,523 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 16:59:27,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:29,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:29,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:31,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:31,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:31,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:31,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:32,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:32,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:32,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:32,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:35,657 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:59:35,767 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:59:35,885 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:59:36,001 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:59:37,009 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:59:37,128 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:59:37,260 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:59:37,391 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:59:37,520 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:59:37,636 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:59:37,748 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:59:37,851 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:59:44,860 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:59:44,962 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:59:45,575 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:59:45,686 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:59:45,805 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:59:45,923 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:59:46,035 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:59:46,144 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:59:46,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:46,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:51,339 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:59:51,446 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:59:52,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:52,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:55,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:55,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:58,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:58,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:59,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:00,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:00,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:00,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:00,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:00,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:00,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:01,788 INFO L134 CoverageAnalysis]: Checked inductivity of 38044 backedges. 2923 proven. 4146 refuted. 0 times theorem prover too weak. 30975 trivial. 0 not checked. [2020-07-20 17:00:01,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268073576] [2020-07-20 17:00:01,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:01,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 35] total 39 [2020-07-20 17:00:01,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519385437] [2020-07-20 17:00:01,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 17:00:01,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:01,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 17:00:01,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1322, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 17:00:01,790 INFO L87 Difference]: Start difference. First operand 680 states and 1220 transitions. Second operand 39 states. [2020-07-20 17:00:12,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:12,541 INFO L93 Difference]: Finished difference Result 1439 states and 2622 transitions. [2020-07-20 17:00:12,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-20 17:00:12,547 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1131 [2020-07-20 17:00:12,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:12,560 INFO L225 Difference]: With dead ends: 1439 [2020-07-20 17:00:12,560 INFO L226 Difference]: Without dead ends: 765 [2020-07-20 17:00:12,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2297 GetRequests, 2191 SyntacticMatches, 33 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=802, Invalid=4748, Unknown=0, NotChecked=0, Total=5550 [2020-07-20 17:00:12,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 765 states. [2020-07-20 17:00:12,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 765 to 689. [2020-07-20 17:00:12,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 689 states. [2020-07-20 17:00:12,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 689 states to 689 states and 1247 transitions. [2020-07-20 17:00:12,614 INFO L78 Accepts]: Start accepts. Automaton has 689 states and 1247 transitions. Word has length 1131 [2020-07-20 17:00:12,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:12,614 INFO L479 AbstractCegarLoop]: Abstraction has 689 states and 1247 transitions. [2020-07-20 17:00:12,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 17:00:12,615 INFO L276 IsEmpty]: Start isEmpty. Operand 689 states and 1247 transitions. [2020-07-20 17:00:12,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1120 [2020-07-20 17:00:12,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:12,626 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 78, 78, 61, 61, 43, 43, 43, 43, 43, 43, 43, 39, 39, 39, 39, 39, 39, 39, 26, 22, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:12,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:12,827 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:12,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:12,828 INFO L82 PathProgramCache]: Analyzing trace with hash -229021515, now seen corresponding path program 59 times [2020-07-20 17:00:12,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:12,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189682390] [2020-07-20 17:00:12,829 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:14,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:00:14,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:14,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 1663 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 17:00:14,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:16,198 INFO L134 CoverageAnalysis]: Checked inductivity of 37212 backedges. 3188 proven. 4053 refuted. 0 times theorem prover too weak. 29971 trivial. 0 not checked. [2020-07-20 17:00:16,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:19,130 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:19,254 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:19,385 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:00:19,514 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:00:20,610 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:00:20,744 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:00:20,886 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:00:21,030 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:00:22,949 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:00:23,053 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:00:23,163 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:23,274 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:23,712 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:23,826 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:23,951 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 17:00:24,082 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 17:00:26,216 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:26,320 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:26,763 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:26,880 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:27,005 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 17:00:27,154 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 17:00:27,287 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 17:00:27,427 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 17:00:27,530 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 17:00:31,096 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:31,304 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 17:00:31,413 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 17:00:31,516 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:00:31,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:31,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:34,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:34,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:36,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:37,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:37,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:38,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:38,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:38,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:38,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:38,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:41,579 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:00:41,684 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:00:41,794 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:41,909 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:42,612 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:42,735 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:42,863 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:00:42,990 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:00:44,096 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:00:44,239 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:00:44,389 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:00:44,540 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:00:44,691 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 17:00:44,830 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 17:00:44,960 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 17:00:45,085 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 17:00:45,200 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 17:00:45,304 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 17:00:52,224 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 17:00:52,353 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 17:00:52,482 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 17:00:52,980 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:00:53,095 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:00:53,215 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:53,333 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:00:54,092 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:54,220 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:00:54,367 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:00:54,498 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:00:54,630 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 17:00:54,747 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 17:00:54,860 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 17:00:54,964 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 17:00:55,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:55,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:59,360 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 17:01:00,216 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 17:01:00,823 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:01:00,937 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:01:01,052 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:01:01,171 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:01:01,283 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 17:01:01,388 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 17:01:01,494 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 17:01:01,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:01,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:05,264 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 17:01:05,373 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 17:01:05,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:05,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts