/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:00:44,432 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:00:44,437 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:00:44,463 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:00:44,464 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:00:44,467 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:00:44,470 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:00:44,485 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:00:44,489 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:00:44,491 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:00:44,493 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:00:44,495 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:00:44,496 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:00:44,501 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:00:44,505 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:00:44,507 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:00:44,510 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:00:44,513 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:00:44,515 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:00:44,523 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:00:44,530 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:00:44,535 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:00:44,536 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:00:44,537 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:00:44,541 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:00:44,558 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:00:44,559 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:00:44,561 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:00:44,562 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:00:44,603 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:00:44,603 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:00:44,609 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:00:44,609 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:00:44,610 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:00:44,610 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:00:44,610 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:00:44,610 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:00:44,610 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:00:44,611 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:00:44,611 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:00:44,611 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:00:44,614 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:00:44,614 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:00:44,615 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:00:44,615 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:00:44,615 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:00:44,615 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:00:44,616 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:00:44,616 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:00:44,616 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:00:44,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:44,616 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:00:44,617 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:00:44,617 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:00:44,617 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:00:44,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,618 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:00:44,618 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:00:44,618 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 -> 2 [2020-07-21 16:00:44,959 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:00:44,976 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:00:44,981 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:00:44,983 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:00:44,984 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:00:44,985 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c [2020-07-21 16:00:45,066 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5afdcd16b/04699dea754e4e66ab9d474cbdadeb0c/FLAG4623101f3 [2020-07-21 16:00:45,644 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:00:45,644 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c [2020-07-21 16:00:45,658 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5afdcd16b/04699dea754e4e66ab9d474cbdadeb0c/FLAG4623101f3 [2020-07-21 16:00:45,959 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5afdcd16b/04699dea754e4e66ab9d474cbdadeb0c [2020-07-21 16:00:45,971 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:00:45,974 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:00:45,975 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:45,975 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:00:45,980 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:00:45,981 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:45" (1/1) ... [2020-07-21 16:00:45,985 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f5380f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:45, skipping insertion in model container [2020-07-21 16:00:45,986 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:45" (1/1) ... [2020-07-21 16:00:45,995 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:00:46,019 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:00:46,218 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:46,224 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:00:46,245 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:46,261 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:00:46,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46 WrapperNode [2020-07-21 16:00:46,262 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:46,263 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:00:46,263 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:00:46,263 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:00:46,276 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... [2020-07-21 16:00:46,277 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... [2020-07-21 16:00:46,283 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... [2020-07-21 16:00:46,283 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... [2020-07-21 16:00:46,288 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... [2020-07-21 16:00:46,292 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... [2020-07-21 16:00:46,293 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... [2020-07-21 16:00:46,295 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:00:46,296 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:00:46,296 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:00:46,296 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:00:46,297 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:46,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:00:46,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:00:46,486 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 16:00:46,486 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 16:00:46,486 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:00:46,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:00:46,487 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:00:46,487 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 16:00:46,487 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 16:00:46,487 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:00:46,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:00:46,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:00:46,752 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:00:46,752 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:00:46,756 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:46 BoogieIcfgContainer [2020-07-21 16:00:46,757 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:00:46,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:00:46,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:00:46,761 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:00:46,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:00:45" (1/3) ... [2020-07-21 16:00:46,763 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53645ede and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:46, skipping insertion in model container [2020-07-21 16:00:46,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:46" (2/3) ... [2020-07-21 16:00:46,763 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53645ede and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:46, skipping insertion in model container [2020-07-21 16:00:46,764 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:46" (3/3) ... [2020-07-21 16:00:46,765 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-1.c [2020-07-21 16:00:46,779 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:00:46,792 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:00:46,805 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:00:46,840 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:00:46,840 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:00:46,840 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:00:46,840 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:00:46,841 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:00:46,841 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:00:46,841 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:00:46,841 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:00:46,864 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 16:00:46,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:00:46,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:46,874 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:46,875 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:46,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:46,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 16:00:46,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:46,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321486688] [2020-07-21 16:00:46,895 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:46,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:46,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:46,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:46,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:47,124 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:47,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321486688] [2020-07-21 16:00:47,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:47,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:47,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590925460] [2020-07-21 16:00:47,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:47,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:47,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:47,160 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 16:00:47,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:47,327 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 16:00:47,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:47,330 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:00:47,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:47,343 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:00:47,343 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:00:47,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:00:47,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:00:47,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 16:00:47,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:47,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:47,414 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 16:00:47,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:47,415 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:47,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:47,415 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:47,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:00:47,418 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:47,418 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:47,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,633 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:47,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:47,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 16:00:47,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:47,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037565895] [2020-07-21 16:00:47,636 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:47,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:47,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:47,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:47,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:47,746 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:47,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037565895] [2020-07-21 16:00:47,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:47,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:47,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659446443] [2020-07-21 16:00:47,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:47,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:47,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:47,753 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 16:00:47,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:47,883 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 16:00:47,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:47,884 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:00:47,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:47,886 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:00:47,887 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:00:47,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:00:47,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:00:47,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:00:47,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:47,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:47,900 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 16:00:47,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:47,901 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:47,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:47,901 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:47,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:00:47,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:47,903 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] [2020-07-21 16:00:48,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,120 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:48,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:48,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 16:00:48,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:48,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737583403] [2020-07-21 16:00:48,123 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:48,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:48,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:48,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,257 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:48,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:48,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,568 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:48,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737583403] [2020-07-21 16:00:48,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:48,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:48,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121887269] [2020-07-21 16:00:48,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:48,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:48,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:48,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:48,572 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 16:00:48,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:48,737 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 16:00:48,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:48,738 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 16:00:48,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:48,740 INFO L225 Difference]: With dead ends: 41 [2020-07-21 16:00:48,741 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 16:00:48,742 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 [2020-07-21 16:00:48,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 16:00:48,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 16:00:48,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:48,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:48,753 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 16:00:48,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:48,754 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:48,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:48,754 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:48,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:00:48,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:48,757 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] [2020-07-21 16:00:48,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,972 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:48,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:48,973 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 16:00:48,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:48,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006062526] [2020-07-21 16:00:48,974 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:49,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:49,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:49,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:49,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:49,070 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:49,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:49,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,348 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:49,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006062526] [2020-07-21 16:00:49,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:49,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:49,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907506142] [2020-07-21 16:00:49,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:49,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:49,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:49,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:49,357 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 16:00:49,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:49,537 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 16:00:49,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:49,538 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 16:00:49,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:49,544 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:00:49,545 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:00:49,548 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 [2020-07-21 16:00:49,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:00:49,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 16:00:49,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:49,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:49,576 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 16:00:49,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:49,576 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:49,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:49,577 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:49,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:00:49,582 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:49,582 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] [2020-07-21 16:00:49,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:49,800 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:49,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:49,801 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 16:00:49,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:49,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531054977] [2020-07-21 16:00:49,802 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:49,849 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:49,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:49,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:49,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:49,924 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:49,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:50,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,328 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:50,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531054977] [2020-07-21 16:00:50,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:50,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:50,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132382147] [2020-07-21 16:00:50,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:50,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:50,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:50,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:50,332 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 16:00:50,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:50,536 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 16:00:50,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:50,537 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 16:00:50,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:50,539 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:00:50,539 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 16:00:50,540 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 [2020-07-21 16:00:50,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 16:00:50,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 16:00:50,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:00:50,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 16:00:50,552 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 16:00:50,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:50,553 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 16:00:50,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:50,553 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 16:00:50,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:00:50,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:50,556 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] [2020-07-21 16:00:50,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,760 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:50,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:50,761 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 16:00:50,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:50,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [580519201] [2020-07-21 16:00:50,763 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,788 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:50,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:50,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:50,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:50,852 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:50,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:51,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,142 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:51,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [580519201] [2020-07-21 16:00:51,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:51,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:51,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424009344] [2020-07-21 16:00:51,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:51,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:51,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:51,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:51,145 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 16:00:51,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:51,431 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 16:00:51,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:51,431 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 16:00:51,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:51,433 INFO L225 Difference]: With dead ends: 84 [2020-07-21 16:00:51,433 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:00:51,436 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 [2020-07-21 16:00:51,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:00:51,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 16:00:51,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 16:00:51,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 16:00:51,449 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 16:00:51,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:51,454 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 16:00:51,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:51,455 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 16:00:51,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:00:51,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:51,457 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] [2020-07-21 16:00:51,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,676 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:51,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:51,676 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 16:00:51,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:51,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544255312] [2020-07-21 16:00:51,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,715 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:51,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:51,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:51,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:51,762 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:00:51,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:51,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,091 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:52,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544255312] [2020-07-21 16:00:52,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:52,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424708652] [2020-07-21 16:00:52,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:52,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:52,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:52,096 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 16:00:52,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:52,274 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:00:52,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:52,275 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 16:00:52,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:52,279 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:00:52,279 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 16:00:52,283 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 [2020-07-21 16:00:52,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 16:00:52,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 16:00:52,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:00:52,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 16:00:52,309 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 16:00:52,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:52,311 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 16:00:52,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:52,311 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 16:00:52,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 16:00:52,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:52,321 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] [2020-07-21 16:00:52,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:52,533 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:52,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:52,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 16:00:52,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:52,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596163886] [2020-07-21 16:00:52,536 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:52,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:52,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:52,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:52,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:52,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:52,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,922 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:52,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596163886] [2020-07-21 16:00:52,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:52,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635790214] [2020-07-21 16:00:52,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:52,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:52,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:52,934 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 16:00:53,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:53,086 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 16:00:53,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:53,087 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 16:00:53,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:53,089 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:00:53,089 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:00:53,090 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 [2020-07-21 16:00:53,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:00:53,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 16:00:53,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 16:00:53,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 16:00:53,108 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 16:00:53,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:53,109 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 16:00:53,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:53,109 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 16:00:53,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:00:53,111 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:53,112 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] [2020-07-21 16:00:53,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,326 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:53,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:53,327 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 16:00:53,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:53,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862632960] [2020-07-21 16:00:53,329 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,378 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:53,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:53,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:53,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:53,462 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 16:00:53,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:53,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:53,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,195 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:00:54,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862632960] [2020-07-21 16:00:54,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:54,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:54,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123686089] [2020-07-21 16:00:54,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:54,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:54,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:54,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:54,201 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 16:00:54,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:54,415 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 16:00:54,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:54,416 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 16:00:54,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:54,418 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:00:54,419 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 16:00:54,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:54,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 16:00:54,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 16:00:54,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:00:54,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 16:00:54,440 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 16:00:54,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:54,441 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 16:00:54,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:54,441 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 16:00:54,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:54,443 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:54,443 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] [2020-07-21 16:00:54,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:54,659 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:54,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:54,660 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 16:00:54,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:54,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527562579] [2020-07-21 16:00:54,662 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:54,704 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:54,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:54,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:54,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:54,800 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:00:54,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:55,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,238 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:55,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527562579] [2020-07-21 16:00:55,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:55,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:55,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72510839] [2020-07-21 16:00:55,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:55,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:55,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:55,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:55,240 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 16:00:55,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:55,498 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 16:00:55,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:55,500 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 16:00:55,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:55,501 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:55,501 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:00:55,505 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 [2020-07-21 16:00:55,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:00:55,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:00:55,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:00:55,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 16:00:55,518 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 16:00:55,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:55,518 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 16:00:55,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:55,519 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 16:00:55,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:55,520 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:55,521 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] [2020-07-21 16:00:55,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:55,735 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:55,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:55,736 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 16:00:55,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:55,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911147491] [2020-07-21 16:00:55,737 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:55,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:55,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:55,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:55,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:55,895 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 16:00:55,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:56,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,593 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 16:00:56,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911147491] [2020-07-21 16:00:56,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:56,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:56,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748339678] [2020-07-21 16:00:56,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:56,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:56,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:56,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:56,597 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 16:00:57,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:57,099 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 16:00:57,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:57,101 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 16:00:57,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:57,104 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:00:57,104 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:00:57,106 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 [2020-07-21 16:00:57,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:00:57,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 16:00:57,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 16:00:57,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 16:00:57,134 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 16:00:57,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:57,134 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 16:00:57,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:57,135 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 16:00:57,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 16:00:57,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:57,139 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] [2020-07-21 16:00:57,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:57,355 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:57,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:57,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 16:00:57,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:57,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [193363007] [2020-07-21 16:00:57,357 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:57,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:57,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:57,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:57,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:57,521 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:00:57,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:58,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,456 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 16:00:58,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [193363007] [2020-07-21 16:00:58,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:58,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:58,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072278532] [2020-07-21 16:00:58,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:58,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:58,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:58,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:58,460 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 16:00:59,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:59,501 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 16:00:59,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:59,502 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 16:00:59,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:59,507 INFO L225 Difference]: With dead ends: 186 [2020-07-21 16:00:59,508 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 16:00:59,510 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 [2020-07-21 16:00:59,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 16:00:59,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 16:00:59,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 16:00:59,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 16:00:59,535 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 16:00:59,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:59,536 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 16:00:59,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:59,536 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 16:00:59,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:59,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:59,538 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] [2020-07-21 16:00:59,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:59,753 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:59,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:59,754 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 16:00:59,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:59,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009785332] [2020-07-21 16:00:59,756 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:59,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:59,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:59,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:59,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:59,906 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 16:00:59,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:00,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,449 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:01:00,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009785332] [2020-07-21 16:01:00,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:00,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:01:00,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829866031] [2020-07-21 16:01:00,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:01:00,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:00,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:01:00,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:00,451 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-21 16:01:00,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:00,654 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 16:01:00,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:00,655 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-21 16:01:00,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:00,657 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:01:00,657 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 16:01:00,659 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 [2020-07-21 16:01:00,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 16:01:00,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 16:01:00,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 16:01:00,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 16:01:00,675 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 16:01:00,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:00,676 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 16:01:00,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:01:00,677 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 16:01:00,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 16:01:00,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:00,679 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] [2020-07-21 16:01:00,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:00,885 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:00,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:00,886 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 16:01:00,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:00,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012504182] [2020-07-21 16:01:00,887 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:00,941 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:00,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:00,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:00,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:01,019 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 16:01:01,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:01,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,735 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 16:01:01,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012504182] [2020-07-21 16:01:01,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:01,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 16:01:01,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288144858] [2020-07-21 16:01:01,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:01,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:01,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:01,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:01,738 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 16:01:02,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:02,245 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 16:01:02,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:01:02,246 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 16:01:02,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:02,250 INFO L225 Difference]: With dead ends: 269 [2020-07-21 16:01:02,250 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 16:01:02,253 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 [2020-07-21 16:01:02,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 16:01:02,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 16:01:02,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 16:01:02,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 16:01:02,276 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 16:01:02,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:02,277 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 16:01:02,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:02,277 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 16:01:02,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 16:01:02,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:02,280 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] [2020-07-21 16:01:02,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:02,495 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:02,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:02,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 16:01:02,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:02,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301496180] [2020-07-21 16:01:02,496 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:02,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:02,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:02,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:01:02,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:02,639 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 16:01:02,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:02,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,037 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 16:01:03,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301496180] [2020-07-21 16:01:03,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:03,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:01:03,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24664923] [2020-07-21 16:01:03,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:01:03,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:03,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:01:03,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:01:03,040 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-21 16:01:03,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:03,224 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 16:01:03,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:01:03,225 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-21 16:01:03,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:03,229 INFO L225 Difference]: With dead ends: 167 [2020-07-21 16:01:03,230 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 16:01:03,234 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 [2020-07-21 16:01:03,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 16:01:03,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 16:01:03,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 16:01:03,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 16:01:03,263 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 16:01:03,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:03,264 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 16:01:03,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:01:03,265 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 16:01:03,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:01:03,270 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:03,270 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] [2020-07-21 16:01:03,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:03,486 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:03,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:03,486 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 16:01:03,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:03,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367117193] [2020-07-21 16:01:03,487 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:03,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:03,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:03,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:03,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:03,665 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 16:01:03,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:04,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,981 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 16:01:04,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367117193] [2020-07-21 16:01:04,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:04,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:01:04,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110077438] [2020-07-21 16:01:04,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:04,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:04,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:04,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:04,985 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 16:01:05,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:05,644 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 16:01:05,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:01:05,645 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 16:01:05,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:05,650 INFO L225 Difference]: With dead ends: 369 [2020-07-21 16:01:05,651 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 16:01:05,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:05,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 16:01:05,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 16:01:05,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 16:01:05,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 16:01:05,683 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 16:01:05,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:05,684 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 16:01:05,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:05,684 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 16:01:05,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 16:01:05,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:05,688 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] [2020-07-21 16:01:05,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:05,902 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:05,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:05,903 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 16:01:05,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:05,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360248578] [2020-07-21 16:01:05,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:06,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:06,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:01:06,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:06,060 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 16:01:06,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:06,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,470 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 16:01:06,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360248578] [2020-07-21 16:01:06,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:06,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:01:06,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500758290] [2020-07-21 16:01:06,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:01:06,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:06,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:01:06,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:01:06,473 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-21 16:01:06,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:06,646 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 16:01:06,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:01:06,647 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-21 16:01:06,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:06,652 INFO L225 Difference]: With dead ends: 191 [2020-07-21 16:01:06,652 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 16:01:06,653 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 [2020-07-21 16:01:06,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 16:01:06,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 16:01:06,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:01:06,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 16:01:06,671 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 16:01:06,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:06,671 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 16:01:06,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:01:06,672 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 16:01:06,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 16:01:06,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:06,675 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] [2020-07-21 16:01:06,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,889 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:06,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:06,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 16:01:06,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:06,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944557246] [2020-07-21 16:01:06,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,984 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:06,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:06,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:06,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:07,070 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 16:01:07,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:07,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,144 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 16:01:08,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944557246] [2020-07-21 16:01:08,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:08,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:01:08,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285403087] [2020-07-21 16:01:08,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:01:08,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:08,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:01:08,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:01:08,147 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-21 16:01:08,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:08,404 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-21 16:01:08,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:08,405 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-21 16:01:08,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:08,409 INFO L225 Difference]: With dead ends: 206 [2020-07-21 16:01:08,410 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 16:01:08,411 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 [2020-07-21 16:01:08,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 16:01:08,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-21 16:01:08,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-21 16:01:08,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-21 16:01:08,437 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-21 16:01:08,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:08,437 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-21 16:01:08,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:01:08,438 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-21 16:01:08,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2020-07-21 16:01:08,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:08,442 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:08,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,656 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:08,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:08,657 INFO L82 PathProgramCache]: Analyzing trace with hash 44883240, now seen corresponding path program 5 times [2020-07-21 16:01:08,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:08,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368457668] [2020-07-21 16:01:08,658 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:08,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:08,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:08,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:08,874 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 260 proven. 31 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-21 16:01:08,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:09,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,956 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 55 proven. 155 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2020-07-21 16:01:09,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368457668] [2020-07-21 16:01:09,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:09,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:01:09,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927895845] [2020-07-21 16:01:09,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:09,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:09,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:09,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:09,958 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-21 16:01:10,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:10,361 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-21 16:01:10,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:01:10,362 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 134 [2020-07-21 16:01:10,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:10,365 INFO L225 Difference]: With dead ends: 376 [2020-07-21 16:01:10,365 INFO L226 Difference]: Without dead ends: 192 [2020-07-21 16:01:10,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 241 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:01:10,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-21 16:01:10,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-21 16:01:10,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 16:01:10,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-21 16:01:10,384 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 134 [2020-07-21 16:01:10,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:10,385 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-21 16:01:10,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:10,385 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-21 16:01:10,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-21 16:01:10,389 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:10,389 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:10,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:10,604 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:10,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:10,605 INFO L82 PathProgramCache]: Analyzing trace with hash -400360989, now seen corresponding path program 6 times [2020-07-21 16:01:10,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:10,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751154691] [2020-07-21 16:01:10,606 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:10,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:10,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:10,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:10,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:10,889 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2020-07-21 16:01:10,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:11,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,086 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 131 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2020-07-21 16:01:12,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751154691] [2020-07-21 16:01:12,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:12,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:12,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523720063] [2020-07-21 16:01:12,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:12,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:12,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:12,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:12,089 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 21 states. [2020-07-21 16:01:12,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:12,885 INFO L93 Difference]: Finished difference Result 474 states and 946 transitions. [2020-07-21 16:01:12,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:01:12,888 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 122 [2020-07-21 16:01:12,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:12,892 INFO L225 Difference]: With dead ends: 474 [2020-07-21 16:01:12,893 INFO L226 Difference]: Without dead ends: 272 [2020-07-21 16:01:12,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 209 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:12,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-07-21 16:01:12,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 239. [2020-07-21 16:01:12,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-21 16:01:12,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 425 transitions. [2020-07-21 16:01:12,920 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 425 transitions. Word has length 122 [2020-07-21 16:01:12,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:12,921 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 425 transitions. [2020-07-21 16:01:12,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:12,921 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 425 transitions. [2020-07-21 16:01:12,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:01:12,926 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:12,926 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 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] [2020-07-21 16:01:13,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:13,141 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:13,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:13,142 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 7 times [2020-07-21 16:01:13,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:13,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885504375] [2020-07-21 16:01:13,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:13,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:13,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:13,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:13,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:13,325 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 107 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 16:01:13,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:14,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,446 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 117 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 16:01:14,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885504375] [2020-07-21 16:01:14,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:14,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:01:14,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638379473] [2020-07-21 16:01:14,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:01:14,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:14,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:01:14,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:01:14,449 INFO L87 Difference]: Start difference. First operand 239 states and 425 transitions. Second operand 16 states. [2020-07-21 16:01:14,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:14,721 INFO L93 Difference]: Finished difference Result 246 states and 435 transitions. [2020-07-21 16:01:14,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:14,722 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 16:01:14,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:14,726 INFO L225 Difference]: With dead ends: 246 [2020-07-21 16:01:14,726 INFO L226 Difference]: Without dead ends: 242 [2020-07-21 16:01:14,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:14,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-07-21 16:01:14,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 234. [2020-07-21 16:01:14,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2020-07-21 16:01:14,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 411 transitions. [2020-07-21 16:01:14,750 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 411 transitions. Word has length 109 [2020-07-21 16:01:14,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:14,751 INFO L479 AbstractCegarLoop]: Abstraction has 234 states and 411 transitions. [2020-07-21 16:01:14,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:01:14,751 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 411 transitions. [2020-07-21 16:01:14,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:01:14,755 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:14,755 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:14,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:14,969 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:14,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:14,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1996526584, now seen corresponding path program 2 times [2020-07-21 16:01:14,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:14,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434310746] [2020-07-21 16:01:14,971 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,101 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:15,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:15,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:15,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:15,175 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 105 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2020-07-21 16:01:15,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:15,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,054 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 110 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2020-07-21 16:01:16,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434310746] [2020-07-21 16:01:16,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:16,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:01:16,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509227714] [2020-07-21 16:01:16,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:01:16,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:16,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:01:16,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:16,057 INFO L87 Difference]: Start difference. First operand 234 states and 411 transitions. Second operand 14 states. [2020-07-21 16:01:16,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:16,288 INFO L93 Difference]: Finished difference Result 272 states and 497 transitions. [2020-07-21 16:01:16,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:16,296 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 16:01:16,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:16,300 INFO L225 Difference]: With dead ends: 272 [2020-07-21 16:01:16,301 INFO L226 Difference]: Without dead ends: 268 [2020-07-21 16:01:16,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 246 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:16,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-07-21 16:01:16,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 247. [2020-07-21 16:01:16,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2020-07-21 16:01:16,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 443 transitions. [2020-07-21 16:01:16,333 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 443 transitions. Word has length 133 [2020-07-21 16:01:16,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:16,334 INFO L479 AbstractCegarLoop]: Abstraction has 247 states and 443 transitions. [2020-07-21 16:01:16,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:01:16,334 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 443 transitions. [2020-07-21 16:01:16,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2020-07-21 16:01:16,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:16,341 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:16,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:16,555 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:16,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:16,556 INFO L82 PathProgramCache]: Analyzing trace with hash -2113921298, now seen corresponding path program 8 times [2020-07-21 16:01:16,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:16,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100897795] [2020-07-21 16:01:16,557 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:16,714 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:16,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:16,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:16,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:16,916 INFO L134 CoverageAnalysis]: Checked inductivity of 1168 backedges. 276 proven. 192 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2020-07-21 16:01:16,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:17,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1168 backedges. 276 proven. 199 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2020-07-21 16:01:18,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100897795] [2020-07-21 16:01:18,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:18,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-21 16:01:18,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375768434] [2020-07-21 16:01:18,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:18,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:18,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:18,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:18,624 INFO L87 Difference]: Start difference. First operand 247 states and 443 transitions. Second operand 23 states. [2020-07-21 16:01:19,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:19,673 INFO L93 Difference]: Finished difference Result 616 states and 1227 transitions. [2020-07-21 16:01:19,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:01:19,674 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 211 [2020-07-21 16:01:19,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:19,681 INFO L225 Difference]: With dead ends: 616 [2020-07-21 16:01:19,681 INFO L226 Difference]: Without dead ends: 366 [2020-07-21 16:01:19,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 388 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=229, Invalid=1103, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:19,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2020-07-21 16:01:19,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 335. [2020-07-21 16:01:19,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 335 states. [2020-07-21 16:01:19,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 670 transitions. [2020-07-21 16:01:19,731 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 670 transitions. Word has length 211 [2020-07-21 16:01:19,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:19,733 INFO L479 AbstractCegarLoop]: Abstraction has 335 states and 670 transitions. [2020-07-21 16:01:19,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:19,734 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 670 transitions. [2020-07-21 16:01:19,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 16:01:19,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:19,741 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] [2020-07-21 16:01:19,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:19,956 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:19,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:19,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1204244367, now seen corresponding path program 9 times [2020-07-21 16:01:19,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:19,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480740592] [2020-07-21 16:01:19,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:20,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:20,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:20,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:20,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:20,151 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 80 proven. 85 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 16:01:20,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:20,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,011 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 80 proven. 90 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-21 16:01:21,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480740592] [2020-07-21 16:01:21,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:21,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:01:21,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653547039] [2020-07-21 16:01:21,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:01:21,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:21,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:01:21,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:21,015 INFO L87 Difference]: Start difference. First operand 335 states and 670 transitions. Second operand 14 states. [2020-07-21 16:01:21,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:21,234 INFO L93 Difference]: Finished difference Result 357 states and 707 transitions. [2020-07-21 16:01:21,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:21,235 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 145 [2020-07-21 16:01:21,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:21,241 INFO L225 Difference]: With dead ends: 357 [2020-07-21 16:01:21,241 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 16:01:21,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:21,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 16:01:21,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 334. [2020-07-21 16:01:21,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-21 16:01:21,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 653 transitions. [2020-07-21 16:01:21,277 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 653 transitions. Word has length 145 [2020-07-21 16:01:21,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:21,277 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 653 transitions. [2020-07-21 16:01:21,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:01:21,278 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 653 transitions. [2020-07-21 16:01:21,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-21 16:01:21,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:21,284 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 14, 14, 12, 10, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:21,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:21,499 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:21,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:21,499 INFO L82 PathProgramCache]: Analyzing trace with hash -604576971, now seen corresponding path program 10 times [2020-07-21 16:01:21,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:21,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250150938] [2020-07-21 16:01:21,501 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:21,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:21,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:21,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:21,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:21,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 252 proven. 370 refuted. 0 times theorem prover too weak. 765 trivial. 0 not checked. [2020-07-21 16:01:21,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:23,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 252 proven. 385 refuted. 0 times theorem prover too weak. 750 trivial. 0 not checked. [2020-07-21 16:01:24,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250150938] [2020-07-21 16:01:24,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:24,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:01:24,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436026879] [2020-07-21 16:01:24,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:24,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:24,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:24,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:24,549 INFO L87 Difference]: Start difference. First operand 334 states and 653 transitions. Second operand 25 states. [2020-07-21 16:01:25,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:25,938 INFO L93 Difference]: Finished difference Result 780 states and 1579 transitions. [2020-07-21 16:01:25,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:01:25,945 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 227 [2020-07-21 16:01:25,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:25,950 INFO L225 Difference]: With dead ends: 780 [2020-07-21 16:01:25,950 INFO L226 Difference]: Without dead ends: 361 [2020-07-21 16:01:25,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 412 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=348, Invalid=1722, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:01:25,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2020-07-21 16:01:25,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 345. [2020-07-21 16:01:25,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 345 states. [2020-07-21 16:01:25,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 661 transitions. [2020-07-21 16:01:25,991 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 661 transitions. Word has length 227 [2020-07-21 16:01:25,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:25,992 INFO L479 AbstractCegarLoop]: Abstraction has 345 states and 661 transitions. [2020-07-21 16:01:25,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:25,992 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 661 transitions. [2020-07-21 16:01:25,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2020-07-21 16:01:25,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:25,997 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:26,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:26,211 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:26,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:26,212 INFO L82 PathProgramCache]: Analyzing trace with hash -713059513, now seen corresponding path program 3 times [2020-07-21 16:01:26,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:26,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1645849584] [2020-07-21 16:01:26,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:26,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:26,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:26,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:26,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:26,463 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 434 proven. 86 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 16:01:26,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:27,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,946 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 99 proven. 235 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2020-07-21 16:01:27,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1645849584] [2020-07-21 16:01:27,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:27,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:01:27,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97622505] [2020-07-21 16:01:27,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:27,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:27,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:27,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:27,948 INFO L87 Difference]: Start difference. First operand 345 states and 661 transitions. Second operand 19 states. [2020-07-21 16:01:28,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:28,459 INFO L93 Difference]: Finished difference Result 738 states and 1451 transitions. [2020-07-21 16:01:28,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:01:28,460 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 171 [2020-07-21 16:01:28,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:28,464 INFO L225 Difference]: With dead ends: 738 [2020-07-21 16:01:28,465 INFO L226 Difference]: Without dead ends: 397 [2020-07-21 16:01:28,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 312 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:01:28,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2020-07-21 16:01:28,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 351. [2020-07-21 16:01:28,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-07-21 16:01:28,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 666 transitions. [2020-07-21 16:01:28,496 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 666 transitions. Word has length 171 [2020-07-21 16:01:28,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:28,497 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 666 transitions. [2020-07-21 16:01:28,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:28,497 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 666 transitions. [2020-07-21 16:01:28,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2020-07-21 16:01:28,502 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:28,502 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 13, 13, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:28,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,718 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:28,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:28,719 INFO L82 PathProgramCache]: Analyzing trace with hash -481896747, now seen corresponding path program 4 times [2020-07-21 16:01:28,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:28,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518545880] [2020-07-21 16:01:28,720 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:28,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:28,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:28,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:29,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1020 backedges. 47 proven. 303 refuted. 0 times theorem prover too weak. 670 trivial. 0 not checked. [2020-07-21 16:01:29,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:30,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1020 backedges. 47 proven. 317 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2020-07-21 16:01:30,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518545880] [2020-07-21 16:01:30,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:30,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:30,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674394401] [2020-07-21 16:01:30,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:30,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:30,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:30,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:30,927 INFO L87 Difference]: Start difference. First operand 351 states and 666 transitions. Second operand 18 states. [2020-07-21 16:01:31,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:31,300 INFO L93 Difference]: Finished difference Result 363 states and 694 transitions. [2020-07-21 16:01:31,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:31,301 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 197 [2020-07-21 16:01:31,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:31,306 INFO L225 Difference]: With dead ends: 363 [2020-07-21 16:01:31,306 INFO L226 Difference]: Without dead ends: 359 [2020-07-21 16:01:31,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 366 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:31,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2020-07-21 16:01:31,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 346. [2020-07-21 16:01:31,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2020-07-21 16:01:31,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 650 transitions. [2020-07-21 16:01:31,339 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 650 transitions. Word has length 197 [2020-07-21 16:01:31,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:31,340 INFO L479 AbstractCegarLoop]: Abstraction has 346 states and 650 transitions. [2020-07-21 16:01:31,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:31,340 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 650 transitions. [2020-07-21 16:01:31,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2020-07-21 16:01:31,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:31,346 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 8, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:31,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:31,559 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:31,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:31,559 INFO L82 PathProgramCache]: Analyzing trace with hash -2020033490, now seen corresponding path program 11 times [2020-07-21 16:01:31,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:31,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720964318] [2020-07-21 16:01:31,560 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:31,750 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:31,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:31,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:31,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:31,919 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 369 proven. 91 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-21 16:01:31,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:33,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,763 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 114 proven. 227 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2020-07-21 16:01:33,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720964318] [2020-07-21 16:01:33,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:33,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:33,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224236188] [2020-07-21 16:01:33,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:33,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:33,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:33,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:33,766 INFO L87 Difference]: Start difference. First operand 346 states and 650 transitions. Second operand 21 states. [2020-07-21 16:01:34,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:34,653 INFO L93 Difference]: Finished difference Result 701 states and 1363 transitions. [2020-07-21 16:01:34,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:01:34,654 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 160 [2020-07-21 16:01:34,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:34,661 INFO L225 Difference]: With dead ends: 701 [2020-07-21 16:01:34,661 INFO L226 Difference]: Without dead ends: 359 [2020-07-21 16:01:34,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 285 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:34,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2020-07-21 16:01:34,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 351. [2020-07-21 16:01:34,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-07-21 16:01:34,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 658 transitions. [2020-07-21 16:01:34,712 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 658 transitions. Word has length 160 [2020-07-21 16:01:34,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:34,712 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 658 transitions. [2020-07-21 16:01:34,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:34,713 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 658 transitions. [2020-07-21 16:01:34,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2020-07-21 16:01:34,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:34,718 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 11, 10, 9, 9, 9, 9, 9, 9, 9, 8, 6, 6, 6, 6, 6, 6, 6, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:34,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:34,933 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:34,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:34,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1726791822, now seen corresponding path program 12 times [2020-07-21 16:01:34,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:34,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216168955] [2020-07-21 16:01:34,934 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:35,139 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:35,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:35,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:35,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:35,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1228 backedges. 60 proven. 338 refuted. 0 times theorem prover too weak. 830 trivial. 0 not checked. [2020-07-21 16:01:35,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:36,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1228 backedges. 60 proven. 354 refuted. 0 times theorem prover too weak. 814 trivial. 0 not checked. [2020-07-21 16:01:37,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216168955] [2020-07-21 16:01:37,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:37,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:37,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919080229] [2020-07-21 16:01:37,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:37,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:37,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:37,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:37,363 INFO L87 Difference]: Start difference. First operand 351 states and 658 transitions. Second operand 18 states. [2020-07-21 16:01:37,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:37,687 INFO L93 Difference]: Finished difference Result 358 states and 667 transitions. [2020-07-21 16:01:37,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:37,690 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 214 [2020-07-21 16:01:37,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:37,694 INFO L225 Difference]: With dead ends: 358 [2020-07-21 16:01:37,694 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 16:01:37,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 399 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:37,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 16:01:37,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 346. [2020-07-21 16:01:37,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2020-07-21 16:01:37,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 639 transitions. [2020-07-21 16:01:37,728 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 639 transitions. Word has length 214 [2020-07-21 16:01:37,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:37,728 INFO L479 AbstractCegarLoop]: Abstraction has 346 states and 639 transitions. [2020-07-21 16:01:37,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:37,729 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 639 transitions. [2020-07-21 16:01:37,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2020-07-21 16:01:37,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:37,735 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 23, 22, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 13, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:37,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:37,949 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:37,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:37,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1110735127, now seen corresponding path program 13 times [2020-07-21 16:01:37,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:37,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56270890] [2020-07-21 16:01:37,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:38,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:38,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:38,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 691 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:38,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:38,535 INFO L134 CoverageAnalysis]: Checked inductivity of 6196 backedges. 3275 proven. 233 refuted. 0 times theorem prover too weak. 2688 trivial. 0 not checked. [2020-07-21 16:01:38,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:40,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:40,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:40,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:40,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:40,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,657 INFO L134 CoverageAnalysis]: Checked inductivity of 6196 backedges. 310 proven. 1014 refuted. 0 times theorem prover too weak. 4872 trivial. 0 not checked. [2020-07-21 16:01:41,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56270890] [2020-07-21 16:01:41,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:41,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-21 16:01:41,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975960754] [2020-07-21 16:01:41,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:41,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:41,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:41,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:41,660 INFO L87 Difference]: Start difference. First operand 346 states and 639 transitions. Second operand 23 states. [2020-07-21 16:01:42,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:42,898 INFO L93 Difference]: Finished difference Result 868 states and 1688 transitions. [2020-07-21 16:01:42,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:01:42,900 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 466 [2020-07-21 16:01:42,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:42,909 INFO L225 Difference]: With dead ends: 868 [2020-07-21 16:01:42,909 INFO L226 Difference]: Without dead ends: 528 [2020-07-21 16:01:42,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 897 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=257, Invalid=1225, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:01:42,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2020-07-21 16:01:42,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 447. [2020-07-21 16:01:42,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 447 states. [2020-07-21 16:01:42,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 838 transitions. [2020-07-21 16:01:42,953 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 838 transitions. Word has length 466 [2020-07-21 16:01:42,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:42,954 INFO L479 AbstractCegarLoop]: Abstraction has 447 states and 838 transitions. [2020-07-21 16:01:42,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:42,954 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 838 transitions. [2020-07-21 16:01:42,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-21 16:01:42,961 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:42,961 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 31, 31, 22, 21, 18, 18, 18, 18, 18, 18, 18, 15, 15, 15, 15, 15, 15, 15, 15, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:43,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:43,176 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:43,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:43,177 INFO L82 PathProgramCache]: Analyzing trace with hash -589404338, now seen corresponding path program 14 times [2020-07-21 16:01:43,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:43,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025002120] [2020-07-21 16:01:43,178 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:43,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:43,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:43,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 672 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:43,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:43,643 INFO L134 CoverageAnalysis]: Checked inductivity of 5853 backedges. 2425 proven. 98 refuted. 0 times theorem prover too weak. 3330 trivial. 0 not checked. [2020-07-21 16:01:43,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:45,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,336 INFO L134 CoverageAnalysis]: Checked inductivity of 5853 backedges. 230 proven. 875 refuted. 0 times theorem prover too weak. 4748 trivial. 0 not checked. [2020-07-21 16:01:46,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2025002120] [2020-07-21 16:01:46,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:46,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:01:46,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332344521] [2020-07-21 16:01:46,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:46,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:46,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:46,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:46,339 INFO L87 Difference]: Start difference. First operand 447 states and 838 transitions. Second operand 19 states. [2020-07-21 16:01:47,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:47,078 INFO L93 Difference]: Finished difference Result 984 states and 1957 transitions. [2020-07-21 16:01:47,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:01:47,079 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 452 [2020-07-21 16:01:47,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:47,087 INFO L225 Difference]: With dead ends: 984 [2020-07-21 16:01:47,087 INFO L226 Difference]: Without dead ends: 533 [2020-07-21 16:01:47,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 916 GetRequests, 873 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:01:47,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2020-07-21 16:01:47,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 455. [2020-07-21 16:01:47,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 455 states. [2020-07-21 16:01:47,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 852 transitions. [2020-07-21 16:01:47,144 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 852 transitions. Word has length 452 [2020-07-21 16:01:47,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:47,145 INFO L479 AbstractCegarLoop]: Abstraction has 455 states and 852 transitions. [2020-07-21 16:01:47,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:47,145 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 852 transitions. [2020-07-21 16:01:47,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 402 [2020-07-21 16:01:47,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:47,153 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 27, 27, 20, 20, 16, 16, 16, 16, 16, 16, 16, 13, 13, 13, 13, 13, 13, 13, 12, 7, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:47,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:47,371 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:47,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:47,372 INFO L82 PathProgramCache]: Analyzing trace with hash 141460050, now seen corresponding path program 15 times [2020-07-21 16:01:47,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:47,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36260506] [2020-07-21 16:01:47,373 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:47,632 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:47,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:47,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:47,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:47,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 404 proven. 881 refuted. 0 times theorem prover too weak. 3275 trivial. 0 not checked. [2020-07-21 16:01:47,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:49,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,326 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 406 proven. 894 refuted. 0 times theorem prover too weak. 3260 trivial. 0 not checked. [2020-07-21 16:01:51,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36260506] [2020-07-21 16:01:51,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:51,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 27 [2020-07-21 16:01:51,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506690579] [2020-07-21 16:01:51,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:01:51,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:51,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:01:51,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:51,330 INFO L87 Difference]: Start difference. First operand 455 states and 852 transitions. Second operand 27 states. [2020-07-21 16:01:53,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:53,075 INFO L93 Difference]: Finished difference Result 1252 states and 2599 transitions. [2020-07-21 16:01:53,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 16:01:53,077 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 401 [2020-07-21 16:01:53,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:53,092 INFO L225 Difference]: With dead ends: 1252 [2020-07-21 16:01:53,092 INFO L226 Difference]: Without dead ends: 803 [2020-07-21 16:01:53,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 824 GetRequests, 759 SyntacticMatches, 17 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=397, Invalid=2053, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:01:53,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 803 states. [2020-07-21 16:01:53,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 803 to 717. [2020-07-21 16:01:53,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 717 states. [2020-07-21 16:01:53,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 717 states to 717 states and 1448 transitions. [2020-07-21 16:01:53,174 INFO L78 Accepts]: Start accepts. Automaton has 717 states and 1448 transitions. Word has length 401 [2020-07-21 16:01:53,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:53,175 INFO L479 AbstractCegarLoop]: Abstraction has 717 states and 1448 transitions. [2020-07-21 16:01:53,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:01:53,175 INFO L276 IsEmpty]: Start isEmpty. Operand 717 states and 1448 transitions. [2020-07-21 16:01:53,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2020-07-21 16:01:53,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:53,185 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 31, 31, 20, 19, 17, 17, 17, 17, 17, 17, 17, 15, 15, 15, 15, 15, 15, 15, 15, 11, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:53,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:53,400 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:53,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:53,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1135549823, now seen corresponding path program 16 times [2020-07-21 16:01:53,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:53,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1599177276] [2020-07-21 16:01:53,403 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:53,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:53,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:53,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:53,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:54,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5429 backedges. 2270 proven. 124 refuted. 0 times theorem prover too weak. 3035 trivial. 0 not checked. [2020-07-21 16:01:54,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:56,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5429 backedges. 240 proven. 1057 refuted. 0 times theorem prover too weak. 4132 trivial. 0 not checked. [2020-07-21 16:01:57,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1599177276] [2020-07-21 16:01:57,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:57,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:57,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589487082] [2020-07-21 16:01:57,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:57,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:57,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:57,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:57,188 INFO L87 Difference]: Start difference. First operand 717 states and 1448 transitions. Second operand 21 states. [2020-07-21 16:01:57,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:57,913 INFO L93 Difference]: Finished difference Result 1436 states and 3024 transitions. [2020-07-21 16:01:57,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:01:57,914 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 436 [2020-07-21 16:01:57,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:57,925 INFO L225 Difference]: With dead ends: 1436 [2020-07-21 16:01:57,925 INFO L226 Difference]: Without dead ends: 720 [2020-07-21 16:01:57,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 837 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:01:57,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2020-07-21 16:01:57,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 606. [2020-07-21 16:01:57,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 606 states. [2020-07-21 16:01:57,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 606 states to 606 states and 1189 transitions. [2020-07-21 16:01:57,990 INFO L78 Accepts]: Start accepts. Automaton has 606 states and 1189 transitions. Word has length 436 [2020-07-21 16:01:57,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:57,991 INFO L479 AbstractCegarLoop]: Abstraction has 606 states and 1189 transitions. [2020-07-21 16:01:57,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:57,991 INFO L276 IsEmpty]: Start isEmpty. Operand 606 states and 1189 transitions. [2020-07-21 16:01:57,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2020-07-21 16:01:57,998 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:57,999 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 26, 26, 19, 15, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 11, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:58,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:58,258 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:58,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:58,259 INFO L82 PathProgramCache]: Analyzing trace with hash 1421719648, now seen corresponding path program 17 times [2020-07-21 16:01:58,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:58,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613359607] [2020-07-21 16:01:58,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:58,553 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:58,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:58,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:01:58,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:58,873 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 2105 proven. 460 refuted. 0 times theorem prover too weak. 1311 trivial. 0 not checked. [2020-07-21 16:01:58,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:01,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:01,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:01,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:01,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:01,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:01,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 350 proven. 1010 refuted. 0 times theorem prover too weak. 2516 trivial. 0 not checked. [2020-07-21 16:02:03,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613359607] [2020-07-21 16:02:03,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:03,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-21 16:02:03,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702296944] [2020-07-21 16:02:03,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:02:03,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:03,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:02:03,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:02:03,638 INFO L87 Difference]: Start difference. First operand 606 states and 1189 transitions. Second operand 29 states. [2020-07-21 16:02:05,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:05,328 INFO L93 Difference]: Finished difference Result 1291 states and 2657 transitions. [2020-07-21 16:02:05,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:02:05,329 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 371 [2020-07-21 16:02:05,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:05,342 INFO L225 Difference]: With dead ends: 1291 [2020-07-21 16:02:05,343 INFO L226 Difference]: Without dead ends: 687 [2020-07-21 16:02:05,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 759 GetRequests, 695 SyntacticMatches, 19 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=341, Invalid=1821, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 16:02:05,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2020-07-21 16:02:05,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 584. [2020-07-21 16:02:05,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-21 16:02:05,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 1128 transitions. [2020-07-21 16:02:05,406 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 1128 transitions. Word has length 371 [2020-07-21 16:02:05,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:05,407 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 1128 transitions. [2020-07-21 16:02:05,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:02:05,407 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 1128 transitions. [2020-07-21 16:02:05,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 16:02:05,413 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:05,414 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:05,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:05,629 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:05,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:05,630 INFO L82 PathProgramCache]: Analyzing trace with hash 1134286378, now seen corresponding path program 18 times [2020-07-21 16:02:05,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:05,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918533253] [2020-07-21 16:02:05,631 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:05,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:05,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:05,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:02:05,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:06,005 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 546 proven. 30 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-21 16:02:06,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:06,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,278 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 140 proven. 178 refuted. 0 times theorem prover too weak. 583 trivial. 0 not checked. [2020-07-21 16:02:07,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918533253] [2020-07-21 16:02:07,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:07,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-21 16:02:07,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22805290] [2020-07-21 16:02:07,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:02:07,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:07,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:02:07,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:02:07,280 INFO L87 Difference]: Start difference. First operand 584 states and 1128 transitions. Second operand 15 states. [2020-07-21 16:02:07,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:07,809 INFO L93 Difference]: Finished difference Result 1184 states and 2431 transitions. [2020-07-21 16:02:07,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:02:07,811 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 187 [2020-07-21 16:02:07,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:07,821 INFO L225 Difference]: With dead ends: 1184 [2020-07-21 16:02:07,821 INFO L226 Difference]: Without dead ends: 603 [2020-07-21 16:02:07,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 351 SyntacticMatches, 9 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:07,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2020-07-21 16:02:07,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 596. [2020-07-21 16:02:07,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 596 states. [2020-07-21 16:02:07,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 596 states to 596 states and 1209 transitions. [2020-07-21 16:02:07,879 INFO L78 Accepts]: Start accepts. Automaton has 596 states and 1209 transitions. Word has length 187 [2020-07-21 16:02:07,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:07,880 INFO L479 AbstractCegarLoop]: Abstraction has 596 states and 1209 transitions. [2020-07-21 16:02:07,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:02:07,880 INFO L276 IsEmpty]: Start isEmpty. Operand 596 states and 1209 transitions. [2020-07-21 16:02:07,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2020-07-21 16:02:07,886 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:07,887 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:08,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:08,101 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:08,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:08,102 INFO L82 PathProgramCache]: Analyzing trace with hash 795536642, now seen corresponding path program 19 times [2020-07-21 16:02:08,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:08,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335022979] [2020-07-21 16:02:08,103 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:08,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:08,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:08,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:08,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:08,622 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 228 proven. 207 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-21 16:02:08,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:09,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,903 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 230 proven. 214 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2020-07-21 16:02:10,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335022979] [2020-07-21 16:02:10,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:10,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:02:10,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64308909] [2020-07-21 16:02:10,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:02:10,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:10,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:02:10,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:02:10,906 INFO L87 Difference]: Start difference. First operand 596 states and 1209 transitions. Second operand 23 states. [2020-07-21 16:02:11,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:11,988 INFO L93 Difference]: Finished difference Result 1211 states and 2590 transitions. [2020-07-21 16:02:11,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:02:11,991 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 186 [2020-07-21 16:02:11,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:12,001 INFO L225 Difference]: With dead ends: 1211 [2020-07-21 16:02:12,001 INFO L226 Difference]: Without dead ends: 603 [2020-07-21 16:02:12,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 333 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:02:12,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2020-07-21 16:02:12,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 557. [2020-07-21 16:02:12,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 557 states. [2020-07-21 16:02:12,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 557 states to 557 states and 1049 transitions. [2020-07-21 16:02:12,064 INFO L78 Accepts]: Start accepts. Automaton has 557 states and 1049 transitions. Word has length 186 [2020-07-21 16:02:12,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:12,065 INFO L479 AbstractCegarLoop]: Abstraction has 557 states and 1049 transitions. [2020-07-21 16:02:12,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:02:12,065 INFO L276 IsEmpty]: Start isEmpty. Operand 557 states and 1049 transitions. [2020-07-21 16:02:12,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2020-07-21 16:02:12,072 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:12,072 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 16, 16, 11, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:12,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:12,286 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:12,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:12,287 INFO L82 PathProgramCache]: Analyzing trace with hash -968563142, now seen corresponding path program 20 times [2020-07-21 16:02:12,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:12,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103796207] [2020-07-21 16:02:12,288 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:12,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:12,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:12,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:12,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:12,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 313 proven. 300 refuted. 0 times theorem prover too weak. 907 trivial. 0 not checked. [2020-07-21 16:02:12,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:14,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 313 proven. 310 refuted. 0 times theorem prover too weak. 897 trivial. 0 not checked. [2020-07-21 16:02:15,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103796207] [2020-07-21 16:02:15,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:15,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:02:15,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621121083] [2020-07-21 16:02:15,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:02:15,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:15,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:02:15,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:02:15,357 INFO L87 Difference]: Start difference. First operand 557 states and 1049 transitions. Second operand 23 states. [2020-07-21 16:02:16,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:16,724 INFO L93 Difference]: Finished difference Result 1209 states and 2327 transitions. [2020-07-21 16:02:16,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:02:16,725 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 238 [2020-07-21 16:02:16,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:16,732 INFO L225 Difference]: With dead ends: 1209 [2020-07-21 16:02:16,732 INFO L226 Difference]: Without dead ends: 653 [2020-07-21 16:02:16,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 437 SyntacticMatches, 17 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=315, Invalid=1491, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:02:16,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2020-07-21 16:02:16,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 588. [2020-07-21 16:02:16,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 588 states. [2020-07-21 16:02:16,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 588 states to 588 states and 1106 transitions. [2020-07-21 16:02:16,787 INFO L78 Accepts]: Start accepts. Automaton has 588 states and 1106 transitions. Word has length 238 [2020-07-21 16:02:16,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:16,787 INFO L479 AbstractCegarLoop]: Abstraction has 588 states and 1106 transitions. [2020-07-21 16:02:16,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:02:16,788 INFO L276 IsEmpty]: Start isEmpty. Operand 588 states and 1106 transitions. [2020-07-21 16:02:16,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 16:02:16,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:16,794 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:17,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:17,010 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:17,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:17,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1294656923, now seen corresponding path program 21 times [2020-07-21 16:02:17,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:17,010 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079606204] [2020-07-21 16:02:17,010 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:17,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:17,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:17,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:17,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:17,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 83 proven. 234 refuted. 0 times theorem prover too weak. 753 trivial. 0 not checked. [2020-07-21 16:02:17,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:18,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 83 proven. 244 refuted. 0 times theorem prover too weak. 743 trivial. 0 not checked. [2020-07-21 16:02:18,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079606204] [2020-07-21 16:02:18,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:18,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:18,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162998928] [2020-07-21 16:02:18,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:18,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:18,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:18,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:18,987 INFO L87 Difference]: Start difference. First operand 588 states and 1106 transitions. Second operand 16 states. [2020-07-21 16:02:19,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:19,320 INFO L93 Difference]: Finished difference Result 598 states and 1120 transitions. [2020-07-21 16:02:19,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:19,322 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-21 16:02:19,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:19,331 INFO L225 Difference]: With dead ends: 598 [2020-07-21 16:02:19,331 INFO L226 Difference]: Without dead ends: 594 [2020-07-21 16:02:19,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 377 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:19,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2020-07-21 16:02:19,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 588. [2020-07-21 16:02:19,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 588 states. [2020-07-21 16:02:19,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 588 states to 588 states and 1106 transitions. [2020-07-21 16:02:19,395 INFO L78 Accepts]: Start accepts. Automaton has 588 states and 1106 transitions. Word has length 201 [2020-07-21 16:02:19,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:19,396 INFO L479 AbstractCegarLoop]: Abstraction has 588 states and 1106 transitions. [2020-07-21 16:02:19,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:19,397 INFO L276 IsEmpty]: Start isEmpty. Operand 588 states and 1106 transitions. [2020-07-21 16:02:19,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 422 [2020-07-21 16:02:19,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:19,407 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 27, 27, 20, 20, 18, 18, 18, 18, 18, 18, 18, 16, 13, 13, 13, 13, 13, 13, 13, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:19,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:19,621 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:19,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:19,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1193129646, now seen corresponding path program 22 times [2020-07-21 16:02:19,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:19,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622944236] [2020-07-21 16:02:19,622 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:20,020 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:20,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:20,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:02:20,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:20,285 INFO L134 CoverageAnalysis]: Checked inductivity of 5158 backedges. 2837 proven. 305 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2020-07-21 16:02:20,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:22,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,772 INFO L134 CoverageAnalysis]: Checked inductivity of 5158 backedges. 299 proven. 1137 refuted. 0 times theorem prover too weak. 3722 trivial. 0 not checked. [2020-07-21 16:02:24,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622944236] [2020-07-21 16:02:24,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:24,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:02:24,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827361374] [2020-07-21 16:02:24,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:02:24,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:24,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:02:24,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:02:24,775 INFO L87 Difference]: Start difference. First operand 588 states and 1106 transitions. Second operand 25 states. [2020-07-21 16:02:26,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:26,107 INFO L93 Difference]: Finished difference Result 1225 states and 2310 transitions. [2020-07-21 16:02:26,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:02:26,108 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 421 [2020-07-21 16:02:26,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:26,119 INFO L225 Difference]: With dead ends: 1225 [2020-07-21 16:02:26,119 INFO L226 Difference]: Without dead ends: 630 [2020-07-21 16:02:26,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 859 GetRequests, 799 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=308, Invalid=1498, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:02:26,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2020-07-21 16:02:26,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 576. [2020-07-21 16:02:26,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 16:02:26,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 1051 transitions. [2020-07-21 16:02:26,160 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 1051 transitions. Word has length 421 [2020-07-21 16:02:26,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:26,161 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 1051 transitions. [2020-07-21 16:02:26,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:02:26,162 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 1051 transitions. [2020-07-21 16:02:26,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2020-07-21 16:02:26,169 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:26,169 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 25, 25, 21, 19, 17, 17, 17, 17, 17, 17, 17, 15, 12, 12, 12, 12, 12, 12, 12, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:26,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:26,385 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:26,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:26,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1093245140, now seen corresponding path program 23 times [2020-07-21 16:02:26,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:26,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179322740] [2020-07-21 16:02:26,387 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:26,756 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:26,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:26,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 587 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:26,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:27,036 INFO L134 CoverageAnalysis]: Checked inductivity of 4567 backedges. 2529 proven. 293 refuted. 0 times theorem prover too weak. 1745 trivial. 0 not checked. [2020-07-21 16:02:27,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:29,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:29,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:29,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:29,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:29,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,032 INFO L134 CoverageAnalysis]: Checked inductivity of 4567 backedges. 289 proven. 903 refuted. 0 times theorem prover too weak. 3375 trivial. 0 not checked. [2020-07-21 16:02:31,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179322740] [2020-07-21 16:02:31,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:31,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 16:02:31,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814190073] [2020-07-21 16:02:31,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:02:31,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:31,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:02:31,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:02:31,035 INFO L87 Difference]: Start difference. First operand 576 states and 1051 transitions. Second operand 25 states. [2020-07-21 16:02:32,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:32,317 INFO L93 Difference]: Finished difference Result 1139 states and 2120 transitions. [2020-07-21 16:02:32,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:02:32,318 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 397 [2020-07-21 16:02:32,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:32,324 INFO L225 Difference]: With dead ends: 1139 [2020-07-21 16:02:32,324 INFO L226 Difference]: Without dead ends: 566 [2020-07-21 16:02:32,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 813 GetRequests, 755 SyntacticMatches, 15 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=335, Invalid=1645, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 16:02:32,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 566 states. [2020-07-21 16:02:32,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 566 to 528. [2020-07-21 16:02:32,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 528 states. [2020-07-21 16:02:32,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 528 states to 528 states and 929 transitions. [2020-07-21 16:02:32,364 INFO L78 Accepts]: Start accepts. Automaton has 528 states and 929 transitions. Word has length 397 [2020-07-21 16:02:32,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:32,365 INFO L479 AbstractCegarLoop]: Abstraction has 528 states and 929 transitions. [2020-07-21 16:02:32,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:02:32,365 INFO L276 IsEmpty]: Start isEmpty. Operand 528 states and 929 transitions. [2020-07-21 16:02:32,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 16:02:32,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:32,371 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 10, 10, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:32,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:32,584 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:32,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:32,585 INFO L82 PathProgramCache]: Analyzing trace with hash -2003809235, now seen corresponding path program 24 times [2020-07-21 16:02:32,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:32,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100047789] [2020-07-21 16:02:32,586 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:32,948 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:32,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:32,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:32,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:33,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1338 backedges. 176 proven. 181 refuted. 0 times theorem prover too weak. 981 trivial. 0 not checked. [2020-07-21 16:02:33,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:34,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1338 backedges. 178 proven. 189 refuted. 0 times theorem prover too weak. 971 trivial. 0 not checked. [2020-07-21 16:02:34,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100047789] [2020-07-21 16:02:34,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:34,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:34,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350847380] [2020-07-21 16:02:34,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:34,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:34,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:34,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:34,810 INFO L87 Difference]: Start difference. First operand 528 states and 929 transitions. Second operand 16 states. [2020-07-21 16:02:35,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:35,180 INFO L93 Difference]: Finished difference Result 564 states and 1007 transitions. [2020-07-21 16:02:35,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:35,182 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 225 [2020-07-21 16:02:35,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:35,188 INFO L225 Difference]: With dead ends: 564 [2020-07-21 16:02:35,188 INFO L226 Difference]: Without dead ends: 560 [2020-07-21 16:02:35,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 425 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:35,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2020-07-21 16:02:35,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 536. [2020-07-21 16:02:35,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 536 states. [2020-07-21 16:02:35,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 952 transitions. [2020-07-21 16:02:35,234 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 952 transitions. Word has length 225 [2020-07-21 16:02:35,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:35,235 INFO L479 AbstractCegarLoop]: Abstraction has 536 states and 952 transitions. [2020-07-21 16:02:35,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:35,235 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 952 transitions. [2020-07-21 16:02:35,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:02:35,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:35,241 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:35,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:35,457 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:35,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:35,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1655485988, now seen corresponding path program 25 times [2020-07-21 16:02:35,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:35,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544180185] [2020-07-21 16:02:35,459 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:35,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:35,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:35,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:02:35,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:35,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 164 proven. 145 refuted. 0 times theorem prover too weak. 1193 trivial. 0 not checked. [2020-07-21 16:02:35,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:36,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:37,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 164 proven. 150 refuted. 0 times theorem prover too weak. 1188 trivial. 0 not checked. [2020-07-21 16:02:37,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544180185] [2020-07-21 16:02:37,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:37,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:02:37,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824728407] [2020-07-21 16:02:37,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:02:37,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:37,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:02:37,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:02:37,203 INFO L87 Difference]: Start difference. First operand 536 states and 952 transitions. Second operand 14 states. [2020-07-21 16:02:37,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:37,495 INFO L93 Difference]: Finished difference Result 588 states and 1099 transitions. [2020-07-21 16:02:37,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:02:37,496 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 237 [2020-07-21 16:02:37,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:37,505 INFO L225 Difference]: With dead ends: 588 [2020-07-21 16:02:37,505 INFO L226 Difference]: Without dead ends: 584 [2020-07-21 16:02:37,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 453 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:37,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2020-07-21 16:02:37,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 539. [2020-07-21 16:02:37,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2020-07-21 16:02:37,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 971 transitions. [2020-07-21 16:02:37,553 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 971 transitions. Word has length 237 [2020-07-21 16:02:37,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:37,554 INFO L479 AbstractCegarLoop]: Abstraction has 539 states and 971 transitions. [2020-07-21 16:02:37,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:02:37,554 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 971 transitions. [2020-07-21 16:02:37,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2020-07-21 16:02:37,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:37,562 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 11, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:37,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:37,777 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:37,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:37,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1358177980, now seen corresponding path program 26 times [2020-07-21 16:02:37,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:37,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1424291168] [2020-07-21 16:02:37,779 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:38,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:38,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:38,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:38,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:38,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 799 proven. 223 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2020-07-21 16:02:38,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:40,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:40,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:40,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:40,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 215 proven. 430 refuted. 0 times theorem prover too weak. 867 trivial. 0 not checked. [2020-07-21 16:02:41,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1424291168] [2020-07-21 16:02:41,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:41,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:02:41,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692376098] [2020-07-21 16:02:41,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:02:41,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:41,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:02:41,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:02:41,563 INFO L87 Difference]: Start difference. First operand 539 states and 971 transitions. Second operand 23 states. [2020-07-21 16:02:42,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:42,556 INFO L93 Difference]: Finished difference Result 1094 states and 1988 transitions. [2020-07-21 16:02:42,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:02:42,558 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 238 [2020-07-21 16:02:42,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:42,565 INFO L225 Difference]: With dead ends: 1094 [2020-07-21 16:02:42,565 INFO L226 Difference]: Without dead ends: 536 [2020-07-21 16:02:42,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 437 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:02:42,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2020-07-21 16:02:42,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 484. [2020-07-21 16:02:42,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 484 states. [2020-07-21 16:02:42,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 875 transitions. [2020-07-21 16:02:42,602 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 875 transitions. Word has length 238 [2020-07-21 16:02:42,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:42,603 INFO L479 AbstractCegarLoop]: Abstraction has 484 states and 875 transitions. [2020-07-21 16:02:42,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:02:42,603 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 875 transitions. [2020-07-21 16:02:42,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2020-07-21 16:02:42,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:42,608 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 18, 18, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:42,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:42,822 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:42,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:42,823 INFO L82 PathProgramCache]: Analyzing trace with hash -989295126, now seen corresponding path program 5 times [2020-07-21 16:02:42,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:42,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1315937256] [2020-07-21 16:02:42,824 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:43,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:43,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:43,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:02:43,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:43,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1876 backedges. 793 proven. 21 refuted. 0 times theorem prover too weak. 1062 trivial. 0 not checked. [2020-07-21 16:02:43,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:44,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:44,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:44,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:44,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:44,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1876 backedges. 395 proven. 74 refuted. 0 times theorem prover too weak. 1407 trivial. 0 not checked. [2020-07-21 16:02:44,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1315937256] [2020-07-21 16:02:44,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:44,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-21 16:02:44,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084301461] [2020-07-21 16:02:44,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:02:44,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:44,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:02:44,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:02:44,737 INFO L87 Difference]: Start difference. First operand 484 states and 875 transitions. Second operand 15 states. [2020-07-21 16:02:45,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:45,173 INFO L93 Difference]: Finished difference Result 942 states and 1746 transitions. [2020-07-21 16:02:45,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:02:45,179 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 262 [2020-07-21 16:02:45,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:45,185 INFO L225 Difference]: With dead ends: 942 [2020-07-21 16:02:45,186 INFO L226 Difference]: Without dead ends: 461 [2020-07-21 16:02:45,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 503 SyntacticMatches, 9 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:45,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2020-07-21 16:02:45,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 433. [2020-07-21 16:02:45,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 433 states. [2020-07-21 16:02:45,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 780 transitions. [2020-07-21 16:02:45,221 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 780 transitions. Word has length 262 [2020-07-21 16:02:45,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:45,222 INFO L479 AbstractCegarLoop]: Abstraction has 433 states and 780 transitions. [2020-07-21 16:02:45,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:02:45,222 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 780 transitions. [2020-07-21 16:02:45,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 16:02:45,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:45,227 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:45,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:45,442 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:45,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:45,443 INFO L82 PathProgramCache]: Analyzing trace with hash -40877557, now seen corresponding path program 27 times [2020-07-21 16:02:45,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:45,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098388399] [2020-07-21 16:02:45,444 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:45,926 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:45,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:45,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:45,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:46,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1674 backedges. 306 proven. 97 refuted. 0 times theorem prover too weak. 1271 trivial. 0 not checked. [2020-07-21 16:02:46,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:47,198 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 16:02:47,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1674 backedges. 308 proven. 105 refuted. 0 times theorem prover too weak. 1261 trivial. 0 not checked. [2020-07-21 16:02:48,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098388399] [2020-07-21 16:02:48,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:48,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:48,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677214509] [2020-07-21 16:02:48,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:48,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:48,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:48,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:48,293 INFO L87 Difference]: Start difference. First operand 433 states and 780 transitions. Second operand 16 states. [2020-07-21 16:02:48,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:48,616 INFO L93 Difference]: Finished difference Result 446 states and 797 transitions. [2020-07-21 16:02:48,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:48,618 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 249 [2020-07-21 16:02:48,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:48,623 INFO L225 Difference]: With dead ends: 446 [2020-07-21 16:02:48,624 INFO L226 Difference]: Without dead ends: 442 [2020-07-21 16:02:48,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 474 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:48,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-21 16:02:48,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 433. [2020-07-21 16:02:48,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 433 states. [2020-07-21 16:02:48,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 780 transitions. [2020-07-21 16:02:48,651 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 780 transitions. Word has length 249 [2020-07-21 16:02:48,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:48,652 INFO L479 AbstractCegarLoop]: Abstraction has 433 states and 780 transitions. [2020-07-21 16:02:48,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:48,652 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 780 transitions. [2020-07-21 16:02:48,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-21 16:02:48,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:48,657 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:48,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:48,858 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:48,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:48,859 INFO L82 PathProgramCache]: Analyzing trace with hash 621318324, now seen corresponding path program 5 times [2020-07-21 16:02:48,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:48,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140026868] [2020-07-21 16:02:48,860 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:49,270 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:49,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:49,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:02:49,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:49,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1858 backedges. 90 proven. 477 refuted. 0 times theorem prover too weak. 1291 trivial. 0 not checked. [2020-07-21 16:02:49,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:51,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:52,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:52,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:52,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:52,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:52,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:53,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:53,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:53,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1858 backedges. 90 proven. 498 refuted. 0 times theorem prover too weak. 1270 trivial. 0 not checked. [2020-07-21 16:02:53,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140026868] [2020-07-21 16:02:53,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:53,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:02:53,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90237639] [2020-07-21 16:02:53,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:02:53,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:53,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:02:53,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:02:53,235 INFO L87 Difference]: Start difference. First operand 433 states and 780 transitions. Second operand 20 states. [2020-07-21 16:02:53,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:53,678 INFO L93 Difference]: Finished difference Result 453 states and 824 transitions. [2020-07-21 16:02:53,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:02:53,679 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 261 [2020-07-21 16:02:53,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:53,687 INFO L225 Difference]: With dead ends: 453 [2020-07-21 16:02:53,687 INFO L226 Difference]: Without dead ends: 449 [2020-07-21 16:02:53,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 490 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:02:53,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-21 16:02:53,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 433. [2020-07-21 16:02:53,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 433 states. [2020-07-21 16:02:53,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 780 transitions. [2020-07-21 16:02:53,721 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 780 transitions. Word has length 261 [2020-07-21 16:02:53,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:53,722 INFO L479 AbstractCegarLoop]: Abstraction has 433 states and 780 transitions. [2020-07-21 16:02:53,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:02:53,722 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 780 transitions. [2020-07-21 16:02:53,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2020-07-21 16:02:53,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:53,727 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 14, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 9, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:53,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:53,935 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:53,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:53,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1378272583, now seen corresponding path program 28 times [2020-07-21 16:02:53,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:53,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498319147] [2020-07-21 16:02:53,937 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:54,352 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:54,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:54,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:54,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:54,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2545 backedges. 1288 proven. 51 refuted. 0 times theorem prover too weak. 1206 trivial. 0 not checked. [2020-07-21 16:02:54,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:56,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2545 backedges. 206 proven. 463 refuted. 0 times theorem prover too weak. 1876 trivial. 0 not checked. [2020-07-21 16:02:56,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498319147] [2020-07-21 16:02:56,980 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:56,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:02:56,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263667681] [2020-07-21 16:02:56,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:02:56,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:56,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:02:56,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:02:56,981 INFO L87 Difference]: Start difference. First operand 433 states and 780 transitions. Second operand 17 states. [2020-07-21 16:02:57,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:57,565 INFO L93 Difference]: Finished difference Result 862 states and 1574 transitions. [2020-07-21 16:02:57,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:02:57,566 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 304 [2020-07-21 16:02:57,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:57,573 INFO L225 Difference]: With dead ends: 862 [2020-07-21 16:02:57,573 INFO L226 Difference]: Without dead ends: 435 [2020-07-21 16:02:57,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 581 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:02:57,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2020-07-21 16:02:57,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 433. [2020-07-21 16:02:57,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 433 states. [2020-07-21 16:02:57,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 774 transitions. [2020-07-21 16:02:57,599 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 774 transitions. Word has length 304 [2020-07-21 16:02:57,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:57,599 INFO L479 AbstractCegarLoop]: Abstraction has 433 states and 774 transitions. [2020-07-21 16:02:57,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:02:57,599 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 774 transitions. [2020-07-21 16:02:57,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-21 16:02:57,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:57,603 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 16, 15, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 10, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:57,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:57,804 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:57,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:57,804 INFO L82 PathProgramCache]: Analyzing trace with hash -835872643, now seen corresponding path program 29 times [2020-07-21 16:02:57,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:57,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328083741] [2020-07-21 16:02:57,805 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:02:58,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:58,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:58,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:02:58,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:58,439 INFO L134 CoverageAnalysis]: Checked inductivity of 3057 backedges. 1768 proven. 174 refuted. 0 times theorem prover too weak. 1115 trivial. 0 not checked. [2020-07-21 16:02:58,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:01,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3057 backedges. 323 proven. 631 refuted. 0 times theorem prover too weak. 2103 trivial. 0 not checked. [2020-07-21 16:03:02,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328083741] [2020-07-21 16:03:02,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:02,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:03:02,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721958240] [2020-07-21 16:03:02,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:03:02,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:02,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:03:02,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:03:02,157 INFO L87 Difference]: Start difference. First operand 433 states and 774 transitions. Second operand 21 states. [2020-07-21 16:03:03,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:03,396 INFO L93 Difference]: Finished difference Result 982 states and 1837 transitions. [2020-07-21 16:03:03,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:03:03,397 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 332 [2020-07-21 16:03:03,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:03,404 INFO L225 Difference]: With dead ends: 982 [2020-07-21 16:03:03,404 INFO L226 Difference]: Without dead ends: 535 [2020-07-21 16:03:03,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 629 SyntacticMatches, 15 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=229, Invalid=1031, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 16:03:03,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2020-07-21 16:03:03,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 453. [2020-07-21 16:03:03,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 453 states. [2020-07-21 16:03:03,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 829 transitions. [2020-07-21 16:03:03,433 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 829 transitions. Word has length 332 [2020-07-21 16:03:03,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:03,433 INFO L479 AbstractCegarLoop]: Abstraction has 453 states and 829 transitions. [2020-07-21 16:03:03,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:03:03,434 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 829 transitions. [2020-07-21 16:03:03,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2020-07-21 16:03:03,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:03,438 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 19, 19, 14, 13, 12, 12, 12, 12, 12, 12, 12, 11, 9, 9, 9, 9, 9, 9, 9, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:03,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:03,653 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:03,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:03,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1805972250, now seen corresponding path program 30 times [2020-07-21 16:03:03,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:03,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100111198] [2020-07-21 16:03:03,655 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:03:04,087 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:04,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:04,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:03:04,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:04,298 INFO L134 CoverageAnalysis]: Checked inductivity of 2365 backedges. 1331 proven. 107 refuted. 0 times theorem prover too weak. 927 trivial. 0 not checked. [2020-07-21 16:03:04,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:06,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:06,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:06,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:06,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2365 backedges. 238 proven. 493 refuted. 0 times theorem prover too weak. 1634 trivial. 0 not checked. [2020-07-21 16:03:07,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100111198] [2020-07-21 16:03:07,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:07,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:03:07,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950737947] [2020-07-21 16:03:07,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:03:07,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:07,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:03:07,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:03:07,207 INFO L87 Difference]: Start difference. First operand 453 states and 829 transitions. Second operand 19 states. [2020-07-21 16:03:07,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:07,924 INFO L93 Difference]: Finished difference Result 919 states and 1701 transitions. [2020-07-21 16:03:07,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:03:07,925 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 292 [2020-07-21 16:03:07,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:07,931 INFO L225 Difference]: With dead ends: 919 [2020-07-21 16:03:07,931 INFO L226 Difference]: Without dead ends: 470 [2020-07-21 16:03:07,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 553 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:03:07,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-21 16:03:07,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 447. [2020-07-21 16:03:07,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 447 states. [2020-07-21 16:03:07,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 801 transitions. [2020-07-21 16:03:07,959 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 801 transitions. Word has length 292 [2020-07-21 16:03:07,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:07,960 INFO L479 AbstractCegarLoop]: Abstraction has 447 states and 801 transitions. [2020-07-21 16:03:07,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:03:07,960 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 801 transitions. [2020-07-21 16:03:07,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2020-07-21 16:03:07,963 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:07,963 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 14, 14, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:08,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:08,164 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:08,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:08,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1432855548, now seen corresponding path program 31 times [2020-07-21 16:03:08,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:08,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618988354] [2020-07-21 16:03:08,165 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:03:08,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:08,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:08,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:03:08,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:08,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 422 proven. 591 refuted. 0 times theorem prover too weak. 1333 trivial. 0 not checked. [2020-07-21 16:03:08,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:11,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:11,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:11,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:11,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:11,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:11,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:13,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:13,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:13,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 422 proven. 615 refuted. 0 times theorem prover too weak. 1309 trivial. 0 not checked. [2020-07-21 16:03:14,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618988354] [2020-07-21 16:03:14,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:14,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:03:14,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619613362] [2020-07-21 16:03:14,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:03:14,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:14,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:03:14,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:03:14,253 INFO L87 Difference]: Start difference. First operand 447 states and 801 transitions. Second operand 29 states. [2020-07-21 16:03:16,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:16,331 INFO L93 Difference]: Finished difference Result 906 states and 1725 transitions. [2020-07-21 16:03:16,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:03:16,333 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 293 [2020-07-21 16:03:16,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:16,340 INFO L225 Difference]: With dead ends: 906 [2020-07-21 16:03:16,340 INFO L226 Difference]: Without dead ends: 455 [2020-07-21 16:03:16,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 535 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 16:03:16,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2020-07-21 16:03:16,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 399. [2020-07-21 16:03:16,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2020-07-21 16:03:16,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 687 transitions. [2020-07-21 16:03:16,366 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 687 transitions. Word has length 293 [2020-07-21 16:03:16,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:16,367 INFO L479 AbstractCegarLoop]: Abstraction has 399 states and 687 transitions. [2020-07-21 16:03:16,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:03:16,367 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 687 transitions. [2020-07-21 16:03:16,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-21 16:03:16,371 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:16,371 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 43, 43, 27, 25, 23, 23, 23, 23, 23, 23, 23, 21, 21, 21, 21, 21, 21, 21, 19, 18, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:16,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:16,574 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:16,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:16,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1884535859, now seen corresponding path program 32 times [2020-07-21 16:03:16,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:16,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [851865063] [2020-07-21 16:03:16,577 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:03:17,123 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:17,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:17,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 874 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:03:17,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:17,576 INFO L134 CoverageAnalysis]: Checked inductivity of 10255 backedges. 692 proven. 1714 refuted. 0 times theorem prover too weak. 7849 trivial. 0 not checked. [2020-07-21 16:03:17,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:20,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:23,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:23,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:24,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:24,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:24,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:24,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:24,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:24,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:25,001 INFO L134 CoverageAnalysis]: Checked inductivity of 10255 backedges. 694 proven. 1738 refuted. 0 times theorem prover too weak. 7823 trivial. 0 not checked. [2020-07-21 16:03:25,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [851865063] [2020-07-21 16:03:25,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:25,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:03:25,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423916157] [2020-07-21 16:03:25,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:03:25,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:25,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:03:25,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:03:25,004 INFO L87 Difference]: Start difference. First operand 399 states and 687 transitions. Second operand 29 states. [2020-07-21 16:03:27,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:27,146 INFO L93 Difference]: Finished difference Result 1008 states and 1893 transitions. [2020-07-21 16:03:27,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:03:27,148 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 593 [2020-07-21 16:03:27,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:27,156 INFO L225 Difference]: With dead ends: 1008 [2020-07-21 16:03:27,156 INFO L226 Difference]: Without dead ends: 533 [2020-07-21 16:03:27,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 1135 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:03:27,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2020-07-21 16:03:27,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 433. [2020-07-21 16:03:27,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 433 states. [2020-07-21 16:03:27,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 746 transitions. [2020-07-21 16:03:27,185 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 746 transitions. Word has length 593 [2020-07-21 16:03:27,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:27,186 INFO L479 AbstractCegarLoop]: Abstraction has 433 states and 746 transitions. [2020-07-21 16:03:27,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:03:27,186 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 746 transitions. [2020-07-21 16:03:27,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-21 16:03:27,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:27,190 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 17, 16, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 10, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:27,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:27,393 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:27,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:27,394 INFO L82 PathProgramCache]: Analyzing trace with hash -401495750, now seen corresponding path program 33 times [2020-07-21 16:03:27,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:27,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561340862] [2020-07-21 16:03:27,395 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:03:28,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:28,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:28,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:03:28,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:28,197 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 130 proven. 750 refuted. 0 times theorem prover too weak. 2968 trivial. 0 not checked. [2020-07-21 16:03:28,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:30,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:30,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:31,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:31,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,851 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 130 proven. 774 refuted. 0 times theorem prover too weak. 2944 trivial. 0 not checked. [2020-07-21 16:03:32,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561340862] [2020-07-21 16:03:32,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:32,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 16:03:32,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005626222] [2020-07-21 16:03:32,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:03:32,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:32,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:03:32,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:03:32,855 INFO L87 Difference]: Start difference. First operand 433 states and 746 transitions. Second operand 19 states. [2020-07-21 16:03:33,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:33,339 INFO L93 Difference]: Finished difference Result 443 states and 759 transitions. [2020-07-21 16:03:33,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:03:33,340 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 370 [2020-07-21 16:03:33,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:33,347 INFO L225 Difference]: With dead ends: 443 [2020-07-21 16:03:33,347 INFO L226 Difference]: Without dead ends: 439 [2020-07-21 16:03:33,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 707 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:03:33,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2020-07-21 16:03:33,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 433. [2020-07-21 16:03:33,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 433 states. [2020-07-21 16:03:33,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 746 transitions. [2020-07-21 16:03:33,370 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 746 transitions. Word has length 370 [2020-07-21 16:03:33,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:33,370 INFO L479 AbstractCegarLoop]: Abstraction has 433 states and 746 transitions. [2020-07-21 16:03:33,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:03:33,370 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 746 transitions. [2020-07-21 16:03:33,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 495 [2020-07-21 16:03:33,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:33,374 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 25, 24, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 12, 12, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:33,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:33,575 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:33,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:33,576 INFO L82 PathProgramCache]: Analyzing trace with hash -939523029, now seen corresponding path program 34 times [2020-07-21 16:03:33,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:33,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620426280] [2020-07-21 16:03:33,577 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:03:34,195 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:34,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:34,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 734 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:03:34,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:34,477 INFO L134 CoverageAnalysis]: Checked inductivity of 6984 backedges. 770 proven. 1181 refuted. 0 times theorem prover too weak. 5033 trivial. 0 not checked. [2020-07-21 16:03:34,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:37,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:37,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:37,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:38,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:38,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:38,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:38,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:38,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:38,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:40,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:40,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:40,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:40,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:41,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:41,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:41,283 INFO L134 CoverageAnalysis]: Checked inductivity of 6984 backedges. 774 proven. 1203 refuted. 0 times theorem prover too weak. 5007 trivial. 0 not checked. [2020-07-21 16:03:41,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620426280] [2020-07-21 16:03:41,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:41,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-21 16:03:41,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971901284] [2020-07-21 16:03:41,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:03:41,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:41,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:03:41,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:03:41,285 INFO L87 Difference]: Start difference. First operand 433 states and 746 transitions. Second operand 31 states. [2020-07-21 16:03:44,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:44,734 INFO L93 Difference]: Finished difference Result 1089 states and 2095 transitions. [2020-07-21 16:03:44,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 16:03:44,737 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 494 [2020-07-21 16:03:44,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:44,746 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 16:03:44,746 INFO L226 Difference]: Without dead ends: 662 [2020-07-21 16:03:44,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1014 GetRequests, 937 SyntacticMatches, 21 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=506, Invalid=2800, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 16:03:44,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2020-07-21 16:03:44,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 576. [2020-07-21 16:03:44,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 16:03:44,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 1116 transitions. [2020-07-21 16:03:44,787 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 1116 transitions. Word has length 494 [2020-07-21 16:03:44,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:44,788 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 1116 transitions. [2020-07-21 16:03:44,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:03:44,788 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 1116 transitions. [2020-07-21 16:03:44,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2020-07-21 16:03:44,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:44,792 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 23, 23, 17, 16, 14, 14, 14, 14, 14, 14, 14, 12, 11, 11, 11, 11, 11, 11, 11, 6, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:44,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:44,994 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:44,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:44,995 INFO L82 PathProgramCache]: Analyzing trace with hash -2030517624, now seen corresponding path program 35 times [2020-07-21 16:03:44,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:44,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926395394] [2020-07-21 16:03:44,996 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:03:45,584 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:45,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:45,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:03:45,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:45,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 154 proven. 560 refuted. 0 times theorem prover too weak. 2650 trivial. 0 not checked. [2020-07-21 16:03:45,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:48,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:48,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:48,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:48,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,751 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 154 proven. 576 refuted. 0 times theorem prover too weak. 2634 trivial. 0 not checked. [2020-07-21 16:03:49,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926395394] [2020-07-21 16:03:49,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:49,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:03:49,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539938843] [2020-07-21 16:03:49,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:03:49,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:49,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:03:49,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:03:49,753 INFO L87 Difference]: Start difference. First operand 576 states and 1116 transitions. Second operand 17 states. [2020-07-21 16:03:50,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:50,281 INFO L93 Difference]: Finished difference Result 644 states and 1247 transitions. [2020-07-21 16:03:50,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:03:50,283 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 346 [2020-07-21 16:03:50,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:50,294 INFO L225 Difference]: With dead ends: 644 [2020-07-21 16:03:50,294 INFO L226 Difference]: Without dead ends: 640 [2020-07-21 16:03:50,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 663 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:03:50,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-07-21 16:03:50,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 611. [2020-07-21 16:03:50,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 611 states. [2020-07-21 16:03:50,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 611 states to 611 states and 1185 transitions. [2020-07-21 16:03:50,335 INFO L78 Accepts]: Start accepts. Automaton has 611 states and 1185 transitions. Word has length 346 [2020-07-21 16:03:50,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:50,335 INFO L479 AbstractCegarLoop]: Abstraction has 611 states and 1185 transitions. [2020-07-21 16:03:50,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:03:50,335 INFO L276 IsEmpty]: Start isEmpty. Operand 611 states and 1185 transitions. [2020-07-21 16:03:50,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 727 [2020-07-21 16:03:50,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:50,342 INFO L422 BasicCegarLoop]: trace histogram [63, 63, 46, 46, 33, 32, 31, 31, 31, 31, 31, 31, 31, 31, 23, 23, 23, 23, 23, 23, 23, 13, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:50,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:50,543 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:50,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:50,544 INFO L82 PathProgramCache]: Analyzing trace with hash 398661753, now seen corresponding path program 36 times [2020-07-21 16:03:50,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:50,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328764113] [2020-07-21 16:03:50,545 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:03:51,201 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:51,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:51,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 1069 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:03:51,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:51,735 INFO L134 CoverageAnalysis]: Checked inductivity of 15848 backedges. 6528 proven. 323 refuted. 0 times theorem prover too weak. 8997 trivial. 0 not checked. [2020-07-21 16:03:51,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:56,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:56,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:57,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:57,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:57,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,762 INFO L134 CoverageAnalysis]: Checked inductivity of 15848 backedges. 457 proven. 2358 refuted. 0 times theorem prover too weak. 13033 trivial. 0 not checked. [2020-07-21 16:03:58,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328764113] [2020-07-21 16:03:58,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:58,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:03:58,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341158530] [2020-07-21 16:03:58,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:03:58,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:58,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:03:58,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:03:58,764 INFO L87 Difference]: Start difference. First operand 611 states and 1185 transitions. Second operand 25 states. [2020-07-21 16:03:59,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:59,936 INFO L93 Difference]: Finished difference Result 1241 states and 2413 transitions. [2020-07-21 16:03:59,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:03:59,938 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 726 [2020-07-21 16:03:59,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:59,945 INFO L225 Difference]: With dead ends: 1241 [2020-07-21 16:03:59,946 INFO L226 Difference]: Without dead ends: 602 [2020-07-21 16:03:59,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1469 GetRequests, 1409 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=308, Invalid=1498, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:03:59,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2020-07-21 16:03:59,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 471. [2020-07-21 16:03:59,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 471 states. [2020-07-21 16:03:59,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 832 transitions. [2020-07-21 16:03:59,975 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 832 transitions. Word has length 726 [2020-07-21 16:03:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:59,976 INFO L479 AbstractCegarLoop]: Abstraction has 471 states and 832 transitions. [2020-07-21 16:03:59,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:03:59,976 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 832 transitions. [2020-07-21 16:03:59,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 16:03:59,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:59,978 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 17, 16, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:00,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:00,179 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:00,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:00,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1775848680, now seen corresponding path program 37 times [2020-07-21 16:04:00,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:00,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659395295] [2020-07-21 16:04:00,181 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:00,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:00,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:00,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:04:00,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:00,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2856 backedges. 177 proven. 477 refuted. 0 times theorem prover too weak. 2202 trivial. 0 not checked. [2020-07-21 16:04:00,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:02,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:03,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2856 backedges. 177 proven. 493 refuted. 0 times theorem prover too weak. 2186 trivial. 0 not checked. [2020-07-21 16:04:03,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659395295] [2020-07-21 16:04:03,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:03,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:04:03,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386685212] [2020-07-21 16:04:03,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:04:03,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:03,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:04:03,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:04:03,801 INFO L87 Difference]: Start difference. First operand 471 states and 832 transitions. Second operand 17 states. [2020-07-21 16:04:04,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:04,153 INFO L93 Difference]: Finished difference Result 599 states and 1134 transitions. [2020-07-21 16:04:04,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:04:04,154 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 322 [2020-07-21 16:04:04,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:04,162 INFO L225 Difference]: With dead ends: 599 [2020-07-21 16:04:04,162 INFO L226 Difference]: Without dead ends: 595 [2020-07-21 16:04:04,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 615 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:04:04,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2020-07-21 16:04:04,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 492. [2020-07-21 16:04:04,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 492 states. [2020-07-21 16:04:04,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 879 transitions. [2020-07-21 16:04:04,209 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 879 transitions. Word has length 322 [2020-07-21 16:04:04,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:04,210 INFO L479 AbstractCegarLoop]: Abstraction has 492 states and 879 transitions. [2020-07-21 16:04:04,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:04:04,210 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 879 transitions. [2020-07-21 16:04:04,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:04:04,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:04,216 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 17, 16, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:04,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:04,432 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:04,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:04,432 INFO L82 PathProgramCache]: Analyzing trace with hash -2074182945, now seen corresponding path program 38 times [2020-07-21 16:04:04,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:04,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903531791] [2020-07-21 16:04:04,432 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:05,106 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:05,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:05,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:04:05,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:05,239 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 252 proven. 484 refuted. 0 times theorem prover too weak. 2848 trivial. 0 not checked. [2020-07-21 16:04:05,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:07,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 254 proven. 498 refuted. 0 times theorem prover too weak. 2832 trivial. 0 not checked. [2020-07-21 16:04:08,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903531791] [2020-07-21 16:04:08,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:08,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:04:08,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313745512] [2020-07-21 16:04:08,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:04:08,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:08,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:04:08,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:04:08,429 INFO L87 Difference]: Start difference. First operand 492 states and 879 transitions. Second operand 17 states. [2020-07-21 16:04:08,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:08,767 INFO L93 Difference]: Finished difference Result 626 states and 1195 transitions. [2020-07-21 16:04:08,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:04:08,768 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 358 [2020-07-21 16:04:08,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:08,776 INFO L225 Difference]: With dead ends: 626 [2020-07-21 16:04:08,776 INFO L226 Difference]: Without dead ends: 622 [2020-07-21 16:04:08,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:04:08,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2020-07-21 16:04:08,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 499. [2020-07-21 16:04:08,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 499 states. [2020-07-21 16:04:08,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 904 transitions. [2020-07-21 16:04:08,809 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 904 transitions. Word has length 358 [2020-07-21 16:04:08,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:08,809 INFO L479 AbstractCegarLoop]: Abstraction has 499 states and 904 transitions. [2020-07-21 16:04:08,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:04:08,809 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 904 transitions. [2020-07-21 16:04:08,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:04:08,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:08,812 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 24, 24, 17, 16, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 12, 8, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:09,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:09,013 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:09,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:09,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1502670847, now seen corresponding path program 39 times [2020-07-21 16:04:09,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:09,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446870882] [2020-07-21 16:04:09,014 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:09,646 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:09,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:09,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:04:09,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:09,854 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 374 proven. 358 refuted. 0 times theorem prover too weak. 2880 trivial. 0 not checked. [2020-07-21 16:04:09,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:11,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,842 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 376 proven. 372 refuted. 0 times theorem prover too weak. 2864 trivial. 0 not checked. [2020-07-21 16:04:12,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446870882] [2020-07-21 16:04:12,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:12,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:04:12,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412134855] [2020-07-21 16:04:12,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:04:12,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:12,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:04:12,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:04:12,844 INFO L87 Difference]: Start difference. First operand 499 states and 904 transitions. Second operand 17 states. [2020-07-21 16:04:13,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:13,230 INFO L93 Difference]: Finished difference Result 579 states and 1110 transitions. [2020-07-21 16:04:13,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:04:13,231 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 358 [2020-07-21 16:04:13,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:13,236 INFO L225 Difference]: With dead ends: 579 [2020-07-21 16:04:13,237 INFO L226 Difference]: Without dead ends: 575 [2020-07-21 16:04:13,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:04:13,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2020-07-21 16:04:13,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 512. [2020-07-21 16:04:13,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-07-21 16:04:13,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 947 transitions. [2020-07-21 16:04:13,264 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 947 transitions. Word has length 358 [2020-07-21 16:04:13,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:13,264 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 947 transitions. [2020-07-21 16:04:13,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:04:13,265 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 947 transitions. [2020-07-21 16:04:13,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-21 16:04:13,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:13,267 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 24, 24, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:13,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:13,468 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:13,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:13,469 INFO L82 PathProgramCache]: Analyzing trace with hash -978493208, now seen corresponding path program 40 times [2020-07-21 16:04:13,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:13,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441544894] [2020-07-21 16:04:13,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:14,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:14,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:14,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:04:14,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:14,325 INFO L134 CoverageAnalysis]: Checked inductivity of 3904 backedges. 340 proven. 310 refuted. 0 times theorem prover too weak. 3254 trivial. 0 not checked. [2020-07-21 16:04:14,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:15,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:15,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:16,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:16,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:16,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:16,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:16,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:16,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:16,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:17,050 INFO L134 CoverageAnalysis]: Checked inductivity of 3904 backedges. 340 proven. 322 refuted. 0 times theorem prover too weak. 3242 trivial. 0 not checked. [2020-07-21 16:04:17,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441544894] [2020-07-21 16:04:17,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:17,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:04:17,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837670282] [2020-07-21 16:04:17,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:04:17,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:17,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:04:17,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:04:17,052 INFO L87 Difference]: Start difference. First operand 512 states and 947 transitions. Second operand 15 states. [2020-07-21 16:04:17,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:17,323 INFO L93 Difference]: Finished difference Result 525 states and 969 transitions. [2020-07-21 16:04:17,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:04:17,324 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 370 [2020-07-21 16:04:17,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:17,329 INFO L225 Difference]: With dead ends: 525 [2020-07-21 16:04:17,329 INFO L226 Difference]: Without dead ends: 521 [2020-07-21 16:04:17,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 744 GetRequests, 715 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:04:17,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2020-07-21 16:04:17,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 502. [2020-07-21 16:04:17,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 502 states. [2020-07-21 16:04:17,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 909 transitions. [2020-07-21 16:04:17,351 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 909 transitions. Word has length 370 [2020-07-21 16:04:17,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:17,351 INFO L479 AbstractCegarLoop]: Abstraction has 502 states and 909 transitions. [2020-07-21 16:04:17,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:04:17,351 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 909 transitions. [2020-07-21 16:04:17,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2020-07-21 16:04:17,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:17,355 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 26, 26, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 13, 13, 13, 13, 13, 13, 13, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:17,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:17,558 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:17,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:17,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1978189279, now seen corresponding path program 41 times [2020-07-21 16:04:17,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:17,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250487476] [2020-07-21 16:04:17,559 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:18,221 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:18,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:18,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 852 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:04:18,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:18,363 INFO L134 CoverageAnalysis]: Checked inductivity of 4148 backedges. 372 proven. 300 refuted. 0 times theorem prover too weak. 3476 trivial. 0 not checked. [2020-07-21 16:04:18,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:19,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:20,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:20,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:20,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:20,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:20,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:20,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:20,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:21,306 INFO L134 CoverageAnalysis]: Checked inductivity of 4148 backedges. 374 proven. 308 refuted. 0 times theorem prover too weak. 3466 trivial. 0 not checked. [2020-07-21 16:04:21,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250487476] [2020-07-21 16:04:21,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:21,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:04:21,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916325797] [2020-07-21 16:04:21,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:04:21,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:21,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:04:21,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:04:21,308 INFO L87 Difference]: Start difference. First operand 502 states and 909 transitions. Second operand 15 states. [2020-07-21 16:04:21,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:21,593 INFO L93 Difference]: Finished difference Result 578 states and 1135 transitions. [2020-07-21 16:04:21,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:04:21,595 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 382 [2020-07-21 16:04:21,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:21,600 INFO L225 Difference]: With dead ends: 578 [2020-07-21 16:04:21,601 INFO L226 Difference]: Without dead ends: 574 [2020-07-21 16:04:21,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 739 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:04:21,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2020-07-21 16:04:21,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 505. [2020-07-21 16:04:21,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 505 states. [2020-07-21 16:04:21,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 924 transitions. [2020-07-21 16:04:21,636 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 924 transitions. Word has length 382 [2020-07-21 16:04:21,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:21,637 INFO L479 AbstractCegarLoop]: Abstraction has 505 states and 924 transitions. [2020-07-21 16:04:21,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:04:21,637 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 924 transitions. [2020-07-21 16:04:21,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 16:04:21,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:21,641 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:21,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:21,855 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:21,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:21,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1544961814, now seen corresponding path program 42 times [2020-07-21 16:04:21,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:21,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994473079] [2020-07-21 16:04:21,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:22,520 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:22,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:22,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:04:22,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:22,747 INFO L134 CoverageAnalysis]: Checked inductivity of 4412 backedges. 627 proven. 191 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2020-07-21 16:04:22,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:24,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:24,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:24,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:24,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:25,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:25,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:25,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:25,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:26,406 INFO L134 CoverageAnalysis]: Checked inductivity of 4412 backedges. 631 proven. 203 refuted. 0 times theorem prover too weak. 3578 trivial. 0 not checked. [2020-07-21 16:04:26,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994473079] [2020-07-21 16:04:26,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:26,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:04:26,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444198593] [2020-07-21 16:04:26,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:04:26,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:26,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:04:26,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:04:26,408 INFO L87 Difference]: Start difference. First operand 505 states and 924 transitions. Second operand 17 states. [2020-07-21 16:04:26,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:26,743 INFO L93 Difference]: Finished difference Result 543 states and 1028 transitions. [2020-07-21 16:04:26,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:04:26,745 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 394 [2020-07-21 16:04:26,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:26,749 INFO L225 Difference]: With dead ends: 543 [2020-07-21 16:04:26,749 INFO L226 Difference]: Without dead ends: 539 [2020-07-21 16:04:26,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 794 GetRequests, 760 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:04:26,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2020-07-21 16:04:26,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 515. [2020-07-21 16:04:26,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 515 states. [2020-07-21 16:04:26,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 515 states to 515 states and 970 transitions. [2020-07-21 16:04:26,775 INFO L78 Accepts]: Start accepts. Automaton has 515 states and 970 transitions. Word has length 394 [2020-07-21 16:04:26,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:26,776 INFO L479 AbstractCegarLoop]: Abstraction has 515 states and 970 transitions. [2020-07-21 16:04:26,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:04:26,776 INFO L276 IsEmpty]: Start isEmpty. Operand 515 states and 970 transitions. [2020-07-21 16:04:26,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-21 16:04:26,779 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:26,780 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 17, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:26,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:26,981 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:26,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:26,981 INFO L82 PathProgramCache]: Analyzing trace with hash -987653852, now seen corresponding path program 43 times [2020-07-21 16:04:26,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:26,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757688262] [2020-07-21 16:04:26,982 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:27,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:27,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:27,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 933 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:04:27,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:27,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 552 proven. 180 refuted. 0 times theorem prover too weak. 4268 trivial. 0 not checked. [2020-07-21 16:04:27,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:29,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:29,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:29,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:29,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:29,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:29,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:29,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:30,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:31,015 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 554 proven. 188 refuted. 0 times theorem prover too weak. 4258 trivial. 0 not checked. [2020-07-21 16:04:31,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757688262] [2020-07-21 16:04:31,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:31,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:04:31,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614307274] [2020-07-21 16:04:31,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:04:31,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:31,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:04:31,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:04:31,017 INFO L87 Difference]: Start difference. First operand 515 states and 970 transitions. Second operand 15 states. [2020-07-21 16:04:31,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:31,374 INFO L93 Difference]: Finished difference Result 527 states and 995 transitions. [2020-07-21 16:04:31,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:04:31,376 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 418 [2020-07-21 16:04:31,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:31,380 INFO L225 Difference]: With dead ends: 527 [2020-07-21 16:04:31,380 INFO L226 Difference]: Without dead ends: 523 [2020-07-21 16:04:31,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 812 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:04:31,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2020-07-21 16:04:31,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 505. [2020-07-21 16:04:31,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 505 states. [2020-07-21 16:04:31,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 924 transitions. [2020-07-21 16:04:31,407 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 924 transitions. Word has length 418 [2020-07-21 16:04:31,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:31,407 INFO L479 AbstractCegarLoop]: Abstraction has 505 states and 924 transitions. [2020-07-21 16:04:31,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:04:31,408 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 924 transitions. [2020-07-21 16:04:31,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 431 [2020-07-21 16:04:31,410 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:31,411 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 31, 31, 18, 17, 17, 17, 17, 17, 17, 17, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:31,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:31,612 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:31,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:31,612 INFO L82 PathProgramCache]: Analyzing trace with hash -1430194917, now seen corresponding path program 6 times [2020-07-21 16:04:31,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:31,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753701725] [2020-07-21 16:04:31,613 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:32,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:32,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:32,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 960 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:04:32,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:32,531 INFO L134 CoverageAnalysis]: Checked inductivity of 5324 backedges. 175 proven. 1003 refuted. 0 times theorem prover too weak. 4146 trivial. 0 not checked. [2020-07-21 16:04:32,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:35,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:36,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:36,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:37,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,779 INFO L134 CoverageAnalysis]: Checked inductivity of 5324 backedges. 175 proven. 1033 refuted. 0 times theorem prover too weak. 4116 trivial. 0 not checked. [2020-07-21 16:04:38,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753701725] [2020-07-21 16:04:38,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:38,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 16:04:38,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703072543] [2020-07-21 16:04:38,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:04:38,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:38,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:04:38,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:04:38,781 INFO L87 Difference]: Start difference. First operand 505 states and 924 transitions. Second operand 21 states. [2020-07-21 16:04:39,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:39,365 INFO L93 Difference]: Finished difference Result 530 states and 984 transitions. [2020-07-21 16:04:39,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:04:39,367 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 430 [2020-07-21 16:04:39,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:39,373 INFO L225 Difference]: With dead ends: 530 [2020-07-21 16:04:39,374 INFO L226 Difference]: Without dead ends: 526 [2020-07-21 16:04:39,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 868 GetRequests, 824 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:04:39,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2020-07-21 16:04:39,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 475. [2020-07-21 16:04:39,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 475 states. [2020-07-21 16:04:39,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 848 transitions. [2020-07-21 16:04:39,405 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 848 transitions. Word has length 430 [2020-07-21 16:04:39,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:39,405 INFO L479 AbstractCegarLoop]: Abstraction has 475 states and 848 transitions. [2020-07-21 16:04:39,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:04:39,406 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 848 transitions. [2020-07-21 16:04:39,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 16:04:39,410 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:39,410 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 31, 31, 23, 23, 19, 19, 19, 19, 19, 19, 19, 15, 15, 15, 15, 15, 15, 15, 15, 8, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:39,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:39,625 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:39,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:39,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1489981651, now seen corresponding path program 44 times [2020-07-21 16:04:39,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:39,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [371037023] [2020-07-21 16:04:39,627 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:40,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:40,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:40,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:04:40,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:40,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6282 backedges. 871 proven. 1216 refuted. 0 times theorem prover too weak. 4195 trivial. 0 not checked. [2020-07-21 16:04:40,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:44,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:45,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:45,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:47,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:48,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:48,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:49,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:49,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:49,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:49,651 INFO L134 CoverageAnalysis]: Checked inductivity of 6282 backedges. 871 proven. 1254 refuted. 0 times theorem prover too weak. 4157 trivial. 0 not checked. [2020-07-21 16:04:49,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [371037023] [2020-07-21 16:04:49,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:49,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:04:49,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289730537] [2020-07-21 16:04:49,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:04:49,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:49,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:04:49,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:04:49,654 INFO L87 Difference]: Start difference. First operand 475 states and 848 transitions. Second operand 33 states. [2020-07-21 16:04:51,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:51,908 INFO L93 Difference]: Finished difference Result 986 states and 1829 transitions. [2020-07-21 16:04:51,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 16:04:51,910 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 467 [2020-07-21 16:04:51,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:51,916 INFO L225 Difference]: With dead ends: 986 [2020-07-21 16:04:51,917 INFO L226 Difference]: Without dead ends: 511 [2020-07-21 16:04:51,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 958 GetRequests, 875 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=505, Invalid=2801, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 16:04:51,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2020-07-21 16:04:51,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 474. [2020-07-21 16:04:51,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 474 states. [2020-07-21 16:04:51,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 806 transitions. [2020-07-21 16:04:51,943 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 806 transitions. Word has length 467 [2020-07-21 16:04:51,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:51,943 INFO L479 AbstractCegarLoop]: Abstraction has 474 states and 806 transitions. [2020-07-21 16:04:51,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:04:51,943 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 806 transitions. [2020-07-21 16:04:51,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 729 [2020-07-21 16:04:51,949 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:51,949 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 51, 51, 34, 33, 29, 29, 29, 29, 29, 29, 29, 25, 25, 25, 25, 25, 25, 25, 24, 18, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:52,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:52,150 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:52,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:52,151 INFO L82 PathProgramCache]: Analyzing trace with hash -998507945, now seen corresponding path program 45 times [2020-07-21 16:04:52,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:52,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511647269] [2020-07-21 16:04:52,153 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:04:53,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:53,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:53,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 1073 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:04:53,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:53,525 INFO L134 CoverageAnalysis]: Checked inductivity of 15625 backedges. 1120 proven. 2179 refuted. 0 times theorem prover too weak. 12326 trivial. 0 not checked. [2020-07-21 16:04:53,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:57,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:02,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:02,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:02,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:03,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:03,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:03,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:03,554 INFO L134 CoverageAnalysis]: Checked inductivity of 15625 backedges. 1124 proven. 2209 refuted. 0 times theorem prover too weak. 12292 trivial. 0 not checked. [2020-07-21 16:05:03,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511647269] [2020-07-21 16:05:03,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:03,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:05:03,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692057016] [2020-07-21 16:05:03,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:05:03,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:03,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:05:03,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:05:03,557 INFO L87 Difference]: Start difference. First operand 474 states and 806 transitions. Second operand 31 states. [2020-07-21 16:05:06,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:06,090 INFO L93 Difference]: Finished difference Result 1111 states and 2130 transitions. [2020-07-21 16:05:06,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:05:06,092 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 728 [2020-07-21 16:05:06,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:06,099 INFO L225 Difference]: With dead ends: 1111 [2020-07-21 16:05:06,099 INFO L226 Difference]: Without dead ends: 636 [2020-07-21 16:05:06,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1481 GetRequests, 1401 SyntacticMatches, 25 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=510, Invalid=2682, Unknown=0, NotChecked=0, Total=3192 [2020-07-21 16:05:06,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2020-07-21 16:05:06,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 530. [2020-07-21 16:05:06,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 530 states. [2020-07-21 16:05:06,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 965 transitions. [2020-07-21 16:05:06,128 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 965 transitions. Word has length 728 [2020-07-21 16:05:06,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:06,129 INFO L479 AbstractCegarLoop]: Abstraction has 530 states and 965 transitions. [2020-07-21 16:05:06,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:05:06,129 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 965 transitions. [2020-07-21 16:05:06,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 572 [2020-07-21 16:05:06,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:06,133 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] [2020-07-21 16:05:06,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:06,334 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:06,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:06,335 INFO L82 PathProgramCache]: Analyzing trace with hash 550043721, now seen corresponding path program 46 times [2020-07-21 16:05:06,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:06,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541254827] [2020-07-21 16:05:06,336 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:05:07,190 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:07,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:07,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 1272 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:05:07,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:07,464 INFO L134 CoverageAnalysis]: Checked inductivity of 9438 backedges. 1852 proven. 17 refuted. 0 times theorem prover too weak. 7569 trivial. 0 not checked. [2020-07-21 16:05:07,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:12,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:12,325 INFO L134 CoverageAnalysis]: Checked inductivity of 9438 backedges. 294 proven. 1077 refuted. 0 times theorem prover too weak. 8067 trivial. 0 not checked. [2020-07-21 16:05:12,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541254827] [2020-07-21 16:05:12,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:12,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 16:05:12,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545384444] [2020-07-21 16:05:12,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:05:12,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:12,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:05:12,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:05:12,327 INFO L87 Difference]: Start difference. First operand 530 states and 965 transitions. Second operand 14 states. [2020-07-21 16:05:12,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:12,817 INFO L93 Difference]: Finished difference Result 1057 states and 2064 transitions. [2020-07-21 16:05:12,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:05:12,819 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 571 [2020-07-21 16:05:12,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:12,825 INFO L225 Difference]: With dead ends: 1057 [2020-07-21 16:05:12,825 INFO L226 Difference]: Without dead ends: 530 [2020-07-21 16:05:12,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1149 GetRequests, 1122 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:05:12,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2020-07-21 16:05:12,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 516. [2020-07-21 16:05:12,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 516 states. [2020-07-21 16:05:12,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 921 transitions. [2020-07-21 16:05:12,851 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 921 transitions. Word has length 571 [2020-07-21 16:05:12,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:12,851 INFO L479 AbstractCegarLoop]: Abstraction has 516 states and 921 transitions. [2020-07-21 16:05:12,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:05:12,851 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 921 transitions. [2020-07-21 16:05:12,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 572 [2020-07-21 16:05:12,854 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:12,855 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] [2020-07-21 16:05:13,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:13,055 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:13,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:13,056 INFO L82 PathProgramCache]: Analyzing trace with hash 2675671, now seen corresponding path program 47 times [2020-07-21 16:05:13,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:13,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302075791] [2020-07-21 16:05:13,057 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:05:13,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:13,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:13,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 1272 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:05:13,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:14,305 INFO L134 CoverageAnalysis]: Checked inductivity of 9438 backedges. 3591 proven. 154 refuted. 0 times theorem prover too weak. 5693 trivial. 0 not checked. [2020-07-21 16:05:14,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:19,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:19,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:20,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:20,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:20,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:21,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:21,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:21,329 INFO L134 CoverageAnalysis]: Checked inductivity of 9438 backedges. 361 proven. 1600 refuted. 0 times theorem prover too weak. 7477 trivial. 0 not checked. [2020-07-21 16:05:21,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302075791] [2020-07-21 16:05:21,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:21,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-21 16:05:21,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828013217] [2020-07-21 16:05:21,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:05:21,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:21,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:05:21,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:05:21,331 INFO L87 Difference]: Start difference. First operand 516 states and 921 transitions. Second operand 23 states. [2020-07-21 16:05:22,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:22,965 INFO L93 Difference]: Finished difference Result 1033 states and 1945 transitions. [2020-07-21 16:05:22,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:05:22,967 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 571 [2020-07-21 16:05:22,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:22,973 INFO L225 Difference]: With dead ends: 1033 [2020-07-21 16:05:22,974 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 16:05:22,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1158 GetRequests, 1105 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=291, Invalid=1269, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:05:22,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 16:05:23,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 498. [2020-07-21 16:05:23,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 498 states. [2020-07-21 16:05:23,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 498 states to 498 states and 842 transitions. [2020-07-21 16:05:23,017 INFO L78 Accepts]: Start accepts. Automaton has 498 states and 842 transitions. Word has length 571 [2020-07-21 16:05:23,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:23,018 INFO L479 AbstractCegarLoop]: Abstraction has 498 states and 842 transitions. [2020-07-21 16:05:23,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:05:23,018 INFO L276 IsEmpty]: Start isEmpty. Operand 498 states and 842 transitions. [2020-07-21 16:05:23,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-21 16:05:23,024 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:23,024 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] [2020-07-21 16:05:23,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:23,238 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:23,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:23,239 INFO L82 PathProgramCache]: Analyzing trace with hash -735451004, now seen corresponding path program 48 times [2020-07-21 16:05:23,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:23,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602859419] [2020-07-21 16:05:23,239 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:05:24,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:24,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:24,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 16:05:24,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:24,662 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 4395 proven. 796 refuted. 0 times theorem prover too weak. 3039 trivial. 0 not checked. [2020-07-21 16:05:24,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:30,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:30,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:35,072 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 574 proven. 1754 refuted. 0 times theorem prover too weak. 5902 trivial. 0 not checked. [2020-07-21 16:05:35,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602859419] [2020-07-21 16:05:35,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:35,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 26] total 31 [2020-07-21 16:05:35,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131442185] [2020-07-21 16:05:35,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:05:35,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:35,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:05:35,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:05:35,074 INFO L87 Difference]: Start difference. First operand 498 states and 842 transitions. Second operand 31 states. [2020-07-21 16:05:37,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:37,912 INFO L93 Difference]: Finished difference Result 1081 states and 1894 transitions. [2020-07-21 16:05:37,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:05:37,914 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 535 [2020-07-21 16:05:37,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:37,920 INFO L225 Difference]: With dead ends: 1081 [2020-07-21 16:05:37,921 INFO L226 Difference]: Without dead ends: 588 [2020-07-21 16:05:37,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1096 GetRequests, 1017 SyntacticMatches, 23 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=536, Invalid=2770, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 16:05:37,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2020-07-21 16:05:37,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 523. [2020-07-21 16:05:37,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 523 states. [2020-07-21 16:05:37,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 874 transitions. [2020-07-21 16:05:37,965 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 874 transitions. Word has length 535 [2020-07-21 16:05:37,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:37,965 INFO L479 AbstractCegarLoop]: Abstraction has 523 states and 874 transitions. [2020-07-21 16:05:37,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:05:37,966 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 874 transitions. [2020-07-21 16:05:37,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-21 16:05:37,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:37,973 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 36, 36, 27, 27, 23, 23, 23, 23, 23, 23, 23, 20, 18, 18, 18, 18, 18, 18, 18, 9, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:38,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:38,187 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:38,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:38,188 INFO L82 PathProgramCache]: Analyzing trace with hash 700363552, now seen corresponding path program 49 times [2020-07-21 16:05:38,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:38,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082930446] [2020-07-21 16:05:38,188 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:05:39,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:39,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:39,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:05:39,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:39,468 INFO L134 CoverageAnalysis]: Checked inductivity of 9170 backedges. 3320 proven. 116 refuted. 0 times theorem prover too weak. 5734 trivial. 0 not checked. [2020-07-21 16:05:39,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:45,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:45,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:46,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:46,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:46,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:46,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:46,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:46,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:47,068 INFO L134 CoverageAnalysis]: Checked inductivity of 9170 backedges. 331 proven. 1380 refuted. 0 times theorem prover too weak. 7459 trivial. 0 not checked. [2020-07-21 16:05:47,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082930446] [2020-07-21 16:05:47,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:47,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 21 [2020-07-21 16:05:47,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068016542] [2020-07-21 16:05:47,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:05:47,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:47,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:05:47,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:05:47,070 INFO L87 Difference]: Start difference. First operand 523 states and 874 transitions. Second operand 21 states. [2020-07-21 16:05:48,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:48,406 INFO L93 Difference]: Finished difference Result 1072 states and 1823 transitions. [2020-07-21 16:05:48,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:05:48,409 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 559 [2020-07-21 16:05:48,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:48,415 INFO L225 Difference]: With dead ends: 1072 [2020-07-21 16:05:48,416 INFO L226 Difference]: Without dead ends: 555 [2020-07-21 16:05:48,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1131 GetRequests, 1085 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:05:48,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2020-07-21 16:05:48,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 523. [2020-07-21 16:05:48,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 523 states. [2020-07-21 16:05:48,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 873 transitions. [2020-07-21 16:05:48,461 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 873 transitions. Word has length 559 [2020-07-21 16:05:48,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:48,462 INFO L479 AbstractCegarLoop]: Abstraction has 523 states and 873 transitions. [2020-07-21 16:05:48,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:05:48,462 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 873 transitions. [2020-07-21 16:05:48,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-21 16:05:48,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:48,468 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 38, 38, 27, 27, 22, 22, 22, 22, 22, 22, 22, 19, 19, 19, 19, 19, 19, 19, 18, 11, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:48,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:48,682 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:48,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:48,682 INFO L82 PathProgramCache]: Analyzing trace with hash -532899038, now seen corresponding path program 50 times [2020-07-21 16:05:48,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:48,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333902926] [2020-07-21 16:05:48,683 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:05:49,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:49,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:49,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:05:49,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:50,082 INFO L134 CoverageAnalysis]: Checked inductivity of 9082 backedges. 4316 proven. 281 refuted. 0 times theorem prover too weak. 4485 trivial. 0 not checked. [2020-07-21 16:05:50,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:55,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:55,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:55,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:56,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:58,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:58,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:58,382 INFO L134 CoverageAnalysis]: Checked inductivity of 9082 backedges. 384 proven. 1600 refuted. 0 times theorem prover too weak. 7098 trivial. 0 not checked. [2020-07-21 16:05:58,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333902926] [2020-07-21 16:05:58,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:58,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-21 16:05:58,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041908102] [2020-07-21 16:05:58,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:05:58,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:58,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:05:58,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:05:58,384 INFO L87 Difference]: Start difference. First operand 523 states and 873 transitions. Second operand 25 states. [2020-07-21 16:06:00,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:00,135 INFO L93 Difference]: Finished difference Result 1087 states and 1877 transitions. [2020-07-21 16:06:00,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 16:06:00,137 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 559 [2020-07-21 16:06:00,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:00,143 INFO L225 Difference]: With dead ends: 1087 [2020-07-21 16:06:00,144 INFO L226 Difference]: Without dead ends: 570 [2020-07-21 16:06:00,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1138 GetRequests, 1077 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:06:00,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2020-07-21 16:06:00,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 527. [2020-07-21 16:06:00,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 527 states. [2020-07-21 16:06:00,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 527 states to 527 states and 875 transitions. [2020-07-21 16:06:00,181 INFO L78 Accepts]: Start accepts. Automaton has 527 states and 875 transitions. Word has length 559 [2020-07-21 16:06:00,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:00,182 INFO L479 AbstractCegarLoop]: Abstraction has 527 states and 875 transitions. [2020-07-21 16:06:00,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:06:00,182 INFO L276 IsEmpty]: Start isEmpty. Operand 527 states and 875 transitions. [2020-07-21 16:06:00,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-21 16:06:00,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:00,187 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 34, 34, 27, 27, 22, 22, 22, 22, 22, 22, 22, 18, 17, 17, 17, 17, 17, 17, 17, 10, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:00,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:00,388 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:00,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:00,388 INFO L82 PathProgramCache]: Analyzing trace with hash 665300290, now seen corresponding path program 51 times [2020-07-21 16:06:00,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:00,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231307435] [2020-07-21 16:06:00,389 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:06:01,333 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:01,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:01,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 16:06:01,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:01,774 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 4494 proven. 714 refuted. 0 times theorem prover too weak. 3166 trivial. 0 not checked. [2020-07-21 16:06:01,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:01,939 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 16:06:07,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:07,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:07,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:07,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:07,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:09,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:10,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:10,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:10,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:10,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:10,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:10,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:11,167 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 518 proven. 1627 refuted. 0 times theorem prover too weak. 6229 trivial. 0 not checked. [2020-07-21 16:06:11,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231307435] [2020-07-21 16:06:11,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:11,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 24] total 29 [2020-07-21 16:06:11,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192872707] [2020-07-21 16:06:11,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:06:11,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:11,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:06:11,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=714, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:06:11,170 INFO L87 Difference]: Start difference. First operand 527 states and 875 transitions. Second operand 29 states. [2020-07-21 16:06:13,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:13,396 INFO L93 Difference]: Finished difference Result 1072 states and 1808 transitions. [2020-07-21 16:06:13,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 16:06:13,399 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 535 [2020-07-21 16:06:13,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:13,404 INFO L225 Difference]: With dead ends: 1072 [2020-07-21 16:06:13,404 INFO L226 Difference]: Without dead ends: 551 [2020-07-21 16:06:13,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1092 GetRequests, 1021 SyntacticMatches, 21 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=446, Invalid=2206, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 16:06:13,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2020-07-21 16:06:13,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 510. [2020-07-21 16:06:13,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 510 states. [2020-07-21 16:06:13,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 833 transitions. [2020-07-21 16:06:13,433 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 833 transitions. Word has length 535 [2020-07-21 16:06:13,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:13,433 INFO L479 AbstractCegarLoop]: Abstraction has 510 states and 833 transitions. [2020-07-21 16:06:13,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:06:13,434 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 833 transitions. [2020-07-21 16:06:13,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-21 16:06:13,440 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:13,440 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] [2020-07-21 16:06:13,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:13,654 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:13,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:13,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1117845504, now seen corresponding path program 52 times [2020-07-21 16:06:13,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:13,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916088698] [2020-07-21 16:06:13,656 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:06:14,700 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:14,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:14,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 16:06:14,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:15,165 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 4542 proven. 612 refuted. 0 times theorem prover too weak. 3076 trivial. 0 not checked. [2020-07-21 16:06:15,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:20,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:20,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:20,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:20,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:20,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:20,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:21,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:23,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:23,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:23,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:23,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:24,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:24,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:24,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:24,436 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 567 proven. 1590 refuted. 0 times theorem prover too weak. 6073 trivial. 0 not checked. [2020-07-21 16:06:24,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916088698] [2020-07-21 16:06:24,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:24,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 24] total 29 [2020-07-21 16:06:24,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127451822] [2020-07-21 16:06:24,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:06:24,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:24,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:06:24,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=714, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:06:24,438 INFO L87 Difference]: Start difference. First operand 510 states and 833 transitions. Second operand 29 states. [2020-07-21 16:06:26,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:26,684 INFO L93 Difference]: Finished difference Result 1051 states and 1739 transitions. [2020-07-21 16:06:26,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 16:06:26,687 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 535 [2020-07-21 16:06:26,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:26,693 INFO L225 Difference]: With dead ends: 1051 [2020-07-21 16:06:26,693 INFO L226 Difference]: Without dead ends: 547 [2020-07-21 16:06:26,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1092 GetRequests, 1021 SyntacticMatches, 21 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=451, Invalid=2201, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 16:06:26,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2020-07-21 16:06:26,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 513. [2020-07-21 16:06:26,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 513 states. [2020-07-21 16:06:26,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 841 transitions. [2020-07-21 16:06:26,723 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 841 transitions. Word has length 535 [2020-07-21 16:06:26,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:26,723 INFO L479 AbstractCegarLoop]: Abstraction has 513 states and 841 transitions. [2020-07-21 16:06:26,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:06:26,724 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 841 transitions. [2020-07-21 16:06:26,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 16:06:26,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:26,729 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 27, 27, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:26,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:26,931 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:26,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:26,932 INFO L82 PathProgramCache]: Analyzing trace with hash 377945707, now seen corresponding path program 53 times [2020-07-21 16:06:26,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:26,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509736017] [2020-07-21 16:06:26,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:06:27,933 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:27,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:27,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 16:06:27,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:28,488 INFO L134 CoverageAnalysis]: Checked inductivity of 7110 backedges. 833 proven. 1344 refuted. 0 times theorem prover too weak. 4933 trivial. 0 not checked. [2020-07-21 16:06:28,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:32,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:32,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:33,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:33,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:33,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:33,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:37,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:38,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:38,670 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 16:06:39,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:39,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:39,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:39,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:39,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:39,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:39,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:40,023 INFO L134 CoverageAnalysis]: Checked inductivity of 7110 backedges. 831 proven. 1378 refuted. 0 times theorem prover too weak. 4901 trivial. 0 not checked. [2020-07-21 16:06:40,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509736017] [2020-07-21 16:06:40,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:40,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 28] total 33 [2020-07-21 16:06:40,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080116594] [2020-07-21 16:06:40,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:06:40,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:40,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:06:40,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:06:40,025 INFO L87 Difference]: Start difference. First operand 513 states and 841 transitions. Second operand 33 states. [2020-07-21 16:06:44,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:44,071 INFO L93 Difference]: Finished difference Result 1073 states and 1806 transitions. [2020-07-21 16:06:44,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 16:06:44,074 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 499 [2020-07-21 16:06:44,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:44,080 INFO L225 Difference]: With dead ends: 1073 [2020-07-21 16:06:44,080 INFO L226 Difference]: Without dead ends: 565 [2020-07-21 16:06:44,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1030 GetRequests, 941 SyntacticMatches, 25 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=692, Invalid=3598, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 16:06:44,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2020-07-21 16:06:44,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 525. [2020-07-21 16:06:44,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 525 states. [2020-07-21 16:06:44,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 837 transitions. [2020-07-21 16:06:44,124 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 837 transitions. Word has length 499 [2020-07-21 16:06:44,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:44,124 INFO L479 AbstractCegarLoop]: Abstraction has 525 states and 837 transitions. [2020-07-21 16:06:44,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:06:44,125 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 837 transitions. [2020-07-21 16:06:44,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-21 16:06:44,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:44,133 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 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] [2020-07-21 16:06:44,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:44,348 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:44,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:44,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 54 times [2020-07-21 16:06:44,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:44,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115849472] [2020-07-21 16:06:44,350 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:06:45,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:45,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:45,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 271 conjunts are in the unsatisfiable core [2020-07-21 16:06:45,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:47,678 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2020-07-21 16:06:47,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2020-07-21 16:07:03,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115849472] [2020-07-21 16:07:03,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:03,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 52 [2020-07-21 16:07:03,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59473480] [2020-07-21 16:07:03,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 16:07:03,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:03,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 16:07:03,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 16:07:03,739 INFO L87 Difference]: Start difference. First operand 525 states and 837 transitions. Second operand 52 states. [2020-07-21 16:07:06,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:06,741 INFO L93 Difference]: Finished difference Result 561 states and 915 transitions. [2020-07-21 16:07:06,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 16:07:06,744 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 463 [2020-07-21 16:07:06,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:06,749 INFO L225 Difference]: With dead ends: 561 [2020-07-21 16:07:06,749 INFO L226 Difference]: Without dead ends: 557 [2020-07-21 16:07:06,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 925 GetRequests, 875 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 16:07:06,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 557 states. [2020-07-21 16:07:06,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 557 to 548. [2020-07-21 16:07:06,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 548 states. [2020-07-21 16:07:06,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 899 transitions. [2020-07-21 16:07:06,778 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 899 transitions. Word has length 463 [2020-07-21 16:07:06,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:06,778 INFO L479 AbstractCegarLoop]: Abstraction has 548 states and 899 transitions. [2020-07-21 16:07:06,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 16:07:06,778 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 899 transitions. [2020-07-21 16:07:06,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-21 16:07:06,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:06,784 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] [2020-07-21 16:07:06,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:06,998 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:06,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:06,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1438052642, now seen corresponding path program 55 times [2020-07-21 16:07:06,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:06,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398190881] [2020-07-21 16:07:07,000 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:07:08,045 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:08,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:08,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 16:07:08,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:08,774 INFO L134 CoverageAnalysis]: Checked inductivity of 7474 backedges. 786 proven. 1456 refuted. 0 times theorem prover too weak. 5232 trivial. 0 not checked. [2020-07-21 16:07:08,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:14,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:14,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:15,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:15,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:15,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:15,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:19,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:19,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:20,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:20,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:21,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:21,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,563 INFO L134 CoverageAnalysis]: Checked inductivity of 7474 backedges. 786 proven. 1488 refuted. 0 times theorem prover too weak. 5200 trivial. 0 not checked. [2020-07-21 16:07:22,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398190881] [2020-07-21 16:07:22,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:22,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 28] total 33 [2020-07-21 16:07:22,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224464486] [2020-07-21 16:07:22,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:07:22,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:22,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:07:22,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:07:22,565 INFO L87 Difference]: Start difference. First operand 548 states and 899 transitions. Second operand 33 states. [2020-07-21 16:07:24,090 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 9 [2020-07-21 16:07:26,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:26,789 INFO L93 Difference]: Finished difference Result 1117 states and 1899 transitions. [2020-07-21 16:07:26,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 16:07:26,794 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 511 [2020-07-21 16:07:26,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:26,801 INFO L225 Difference]: With dead ends: 1117 [2020-07-21 16:07:26,801 INFO L226 Difference]: Without dead ends: 575 [2020-07-21 16:07:26,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 965 SyntacticMatches, 25 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 794 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=604, Invalid=3178, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 16:07:26,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2020-07-21 16:07:26,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 542. [2020-07-21 16:07:26,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 542 states. [2020-07-21 16:07:26,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 875 transitions. [2020-07-21 16:07:26,832 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 875 transitions. Word has length 511 [2020-07-21 16:07:26,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:26,832 INFO L479 AbstractCegarLoop]: Abstraction has 542 states and 875 transitions. [2020-07-21 16:07:26,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:07:26,832 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 875 transitions. [2020-07-21 16:07:26,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 16:07:26,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:26,837 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 27, 27, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:27,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:27,038 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:27,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:27,039 INFO L82 PathProgramCache]: Analyzing trace with hash -460756800, now seen corresponding path program 56 times [2020-07-21 16:07:27,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:27,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867888081] [2020-07-21 16:07:27,040 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:07:28,128 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:28,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:28,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 16:07:28,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:28,798 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 913 proven. 1206 refuted. 0 times theorem prover too weak. 4639 trivial. 0 not checked. [2020-07-21 16:07:28,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:33,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:35,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:38,948 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 16:07:39,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:39,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:41,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:41,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:42,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:42,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:42,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:42,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:42,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:43,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:43,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 911 proven. 1240 refuted. 0 times theorem prover too weak. 4607 trivial. 0 not checked. [2020-07-21 16:07:43,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867888081] [2020-07-21 16:07:43,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:43,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 28] total 33 [2020-07-21 16:07:43,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910960946] [2020-07-21 16:07:43,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:07:43,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:43,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:07:43,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:07:43,355 INFO L87 Difference]: Start difference. First operand 542 states and 875 transitions. Second operand 33 states. [2020-07-21 16:07:47,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:47,605 INFO L93 Difference]: Finished difference Result 1089 states and 1772 transitions. [2020-07-21 16:07:47,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:07:47,609 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 487 [2020-07-21 16:07:47,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:47,615 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 16:07:47,615 INFO L226 Difference]: Without dead ends: 553 [2020-07-21 16:07:47,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1000 GetRequests, 917 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=585, Invalid=2955, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 16:07:47,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2020-07-21 16:07:47,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 539. [2020-07-21 16:07:47,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2020-07-21 16:07:47,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 860 transitions. [2020-07-21 16:07:47,661 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 860 transitions. Word has length 487 [2020-07-21 16:07:47,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:47,662 INFO L479 AbstractCegarLoop]: Abstraction has 539 states and 860 transitions. [2020-07-21 16:07:47,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:07:47,662 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 860 transitions. [2020-07-21 16:07:47,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 620 [2020-07-21 16:07:47,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:47,670 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 38, 38, 28, 27, 27, 27, 27, 27, 27, 27, 27, 27, 19, 19, 19, 19, 19, 19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:47,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:47,885 INFO L427 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:47,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:47,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1929628955, now seen corresponding path program 6 times [2020-07-21 16:07:47,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:47,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576396693] [2020-07-21 16:07:47,886 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:49,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:49,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:49,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 1380 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:07:49,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:49,444 INFO L134 CoverageAnalysis]: Checked inductivity of 11542 backedges. 2122 proven. 11 refuted. 0 times theorem prover too weak. 9409 trivial. 0 not checked. [2020-07-21 16:07:49,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:58,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:59,294 INFO L134 CoverageAnalysis]: Checked inductivity of 11542 backedges. 331 proven. 1204 refuted. 0 times theorem prover too weak. 10007 trivial. 0 not checked. [2020-07-21 16:07:59,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576396693] [2020-07-21 16:07:59,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:59,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 16:07:59,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597121958] [2020-07-21 16:07:59,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:07:59,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:59,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:07:59,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:07:59,297 INFO L87 Difference]: Start difference. First operand 539 states and 860 transitions. Second operand 14 states. [2020-07-21 16:07:59,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:59,944 INFO L93 Difference]: Finished difference Result 1006 states and 1655 transitions. [2020-07-21 16:07:59,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:07:59,949 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 619 [2020-07-21 16:07:59,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:59,954 INFO L225 Difference]: With dead ends: 1006 [2020-07-21 16:07:59,954 INFO L226 Difference]: Without dead ends: 473 [2020-07-21 16:07:59,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1242 GetRequests, 1218 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:07:59,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2020-07-21 16:07:59,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 473. [2020-07-21 16:07:59,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 473 states. [2020-07-21 16:07:59,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 708 transitions. [2020-07-21 16:07:59,981 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 708 transitions. Word has length 619 [2020-07-21 16:07:59,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:59,982 INFO L479 AbstractCegarLoop]: Abstraction has 473 states and 708 transitions. [2020-07-21 16:07:59,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:07:59,982 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 708 transitions. [2020-07-21 16:07:59,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1409 [2020-07-21 16:07:59,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:59,998 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 102, 102, 69, 66, 54, 54, 54, 54, 54, 54, 54, 51, 51, 51, 51, 51, 51, 51, 40, 36, 18, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:00,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:00,199 INFO L427 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:00,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:00,200 INFO L82 PathProgramCache]: Analyzing trace with hash 1190319710, now seen corresponding path program 57 times [2020-07-21 16:08:00,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:00,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751240226] [2020-07-21 16:08:00,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:01,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:08:01,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:01,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 2077 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:08:01,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:02,982 INFO L134 CoverageAnalysis]: Checked inductivity of 59463 backedges. 31125 proven. 2105 refuted. 0 times theorem prover too weak. 26233 trivial. 0 not checked. [2020-07-21 16:08:02,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:24,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:25,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:25,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:25,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:25,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:25,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:25,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:26,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:30,243 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:08:33,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:33,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:35,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:40,186 INFO L134 CoverageAnalysis]: Checked inductivity of 59463 backedges. 1643 proven. 5470 refuted. 0 times theorem prover too weak. 52350 trivial. 0 not checked. [2020-07-21 16:08:40,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751240226] [2020-07-21 16:08:40,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:08:40,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:08:40,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208926277] [2020-07-21 16:08:40,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:08:40,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:08:40,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:08:40,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:08:40,190 INFO L87 Difference]: Start difference. First operand 473 states and 708 transitions. Second operand 31 states. [2020-07-21 16:08:46,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:08:46,738 INFO L93 Difference]: Finished difference Result 1071 states and 1781 transitions. [2020-07-21 16:08:46,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 16:08:46,744 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1408 [2020-07-21 16:08:46,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:08:46,751 INFO L225 Difference]: With dead ends: 1071 [2020-07-21 16:08:46,751 INFO L226 Difference]: Without dead ends: 603 [2020-07-21 16:08:46,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2847 GetRequests, 2761 SyntacticMatches, 25 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 832 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=613, Invalid=3293, Unknown=0, NotChecked=0, Total=3906 [2020-07-21 16:08:46,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2020-07-21 16:08:46,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 514. [2020-07-21 16:08:46,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 16:08:46,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 787 transitions. [2020-07-21 16:08:46,784 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 787 transitions. Word has length 1408 [2020-07-21 16:08:46,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:08:46,784 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 787 transitions. [2020-07-21 16:08:46,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:08:46,784 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 787 transitions. [2020-07-21 16:08:46,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1079 [2020-07-21 16:08:46,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:08:46,795 INFO L422 BasicCegarLoop]: trace histogram [89, 89, 74, 74, 47, 46, 44, 44, 44, 44, 44, 44, 44, 42, 37, 37, 37, 37, 37, 37, 37, 28, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:46,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:46,996 INFO L427 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:46,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:46,997 INFO L82 PathProgramCache]: Analyzing trace with hash 39233844, now seen corresponding path program 58 times [2020-07-21 16:08:46,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:46,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1218075066] [2020-07-21 16:08:46,998 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:48,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:08:48,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:48,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 1581 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:08:48,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:49,382 INFO L134 CoverageAnalysis]: Checked inductivity of 35032 backedges. 18695 proven. 1348 refuted. 0 times theorem prover too weak. 14989 trivial. 0 not checked. [2020-07-21 16:08:49,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:51,699 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:08:51,803 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:09:09,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:09,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:10,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:10,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:13,267 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:09:17,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:17,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:19,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:19,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:22,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:22,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:22,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:22,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:23,234 INFO L134 CoverageAnalysis]: Checked inductivity of 35032 backedges. 1258 proven. 4113 refuted. 0 times theorem prover too weak. 29661 trivial. 0 not checked. [2020-07-21 16:09:23,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1218075066] [2020-07-21 16:09:23,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:09:23,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:09:23,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992056306] [2020-07-21 16:09:23,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:09:23,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:09:23,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:09:23,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:09:23,237 INFO L87 Difference]: Start difference. First operand 514 states and 787 transitions. Second operand 31 states. [2020-07-21 16:09:29,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:09:29,029 INFO L93 Difference]: Finished difference Result 1101 states and 1787 transitions. [2020-07-21 16:09:29,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 16:09:29,035 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1078 [2020-07-21 16:09:29,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:09:29,043 INFO L225 Difference]: With dead ends: 1101 [2020-07-21 16:09:29,044 INFO L226 Difference]: Without dead ends: 593 [2020-07-21 16:09:29,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2179 GetRequests, 2101 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=468, Invalid=2502, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 16:09:29,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2020-07-21 16:09:29,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 550. [2020-07-21 16:09:29,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 550 states. [2020-07-21 16:09:29,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 891 transitions. [2020-07-21 16:09:29,089 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 891 transitions. Word has length 1078 [2020-07-21 16:09:29,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:09:29,090 INFO L479 AbstractCegarLoop]: Abstraction has 550 states and 891 transitions. [2020-07-21 16:09:29,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:09:29,090 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 891 transitions. [2020-07-21 16:09:29,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1115 [2020-07-21 16:09:29,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:09:29,101 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 82, 82, 47, 46, 43, 43, 43, 43, 43, 43, 43, 41, 41, 41, 41, 41, 41, 41, 40, 36, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:09:29,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:09:29,303 INFO L427 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:09:29,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:09:29,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1883278187, now seen corresponding path program 59 times [2020-07-21 16:09:29,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:09:29,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174892057] [2020-07-21 16:09:29,305 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:09:30,645 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:09:30,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:09:30,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 1636 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:09:30,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:09:31,898 INFO L134 CoverageAnalysis]: Checked inductivity of 37256 backedges. 19944 proven. 1472 refuted. 0 times theorem prover too weak. 15840 trivial. 0 not checked. [2020-07-21 16:09:31,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:09:34,439 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:09:34,551 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:09:49,553 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:09:49,666 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:09:49,777 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:09:54,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:55,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:56,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:56,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:57,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:57,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:57,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:58,707 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 16:10:00,146 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:00,254 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:00,369 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:00,483 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:00,594 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:00,698 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:10:05,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:05,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:07,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:07,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:09,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:09,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:11,526 INFO L134 CoverageAnalysis]: Checked inductivity of 37256 backedges. 1402 proven. 4491 refuted. 0 times theorem prover too weak. 31363 trivial. 0 not checked. [2020-07-21 16:10:11,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174892057] [2020-07-21 16:10:11,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:11,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:10:11,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573226883] [2020-07-21 16:10:11,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:10:11,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:11,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:10:11,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:10:11,529 INFO L87 Difference]: Start difference. First operand 550 states and 891 transitions. Second operand 33 states. [2020-07-21 16:10:17,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:17,836 INFO L93 Difference]: Finished difference Result 1128 states and 1844 transitions. [2020-07-21 16:10:17,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 16:10:17,843 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1114 [2020-07-21 16:10:17,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:17,849 INFO L225 Difference]: With dead ends: 1128 [2020-07-21 16:10:17,849 INFO L226 Difference]: Without dead ends: 584 [2020-07-21 16:10:17,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2252 GetRequests, 2169 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=505, Invalid=2801, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 16:10:17,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2020-07-21 16:10:17,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 550. [2020-07-21 16:10:17,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 550 states. [2020-07-21 16:10:17,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 881 transitions. [2020-07-21 16:10:17,891 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 881 transitions. Word has length 1114 [2020-07-21 16:10:17,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:17,892 INFO L479 AbstractCegarLoop]: Abstraction has 550 states and 881 transitions. [2020-07-21 16:10:17,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:10:17,892 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 881 transitions. [2020-07-21 16:10:17,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1164 [2020-07-21 16:10:17,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:17,906 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 84, 84, 65, 65, 43, 43, 43, 43, 43, 43, 43, 42, 42, 42, 42, 42, 42, 42, 23, 22, 22, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:10:18,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:18,108 INFO L427 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:18,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:18,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1794802476, now seen corresponding path program 60 times [2020-07-21 16:10:18,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:18,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017476330] [2020-07-21 16:10:18,110 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:19,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:19,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:19,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 1731 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 16:10:19,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:21,334 INFO L134 CoverageAnalysis]: Checked inductivity of 40124 backedges. 2511 proven. 5103 refuted. 0 times theorem prover too weak. 32510 trivial. 0 not checked. [2020-07-21 16:10:21,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:23,754 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:23,861 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:23,979 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:24,094 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:24,672 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:24,787 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:24,916 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:25,043 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:27,479 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:27,589 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:28,222 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:28,340 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:28,468 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:28,593 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:29,235 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:29,368 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:29,514 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:29,656 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:32,799 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:32,910 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:33,419 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:33,536 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:33,657 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:33,780 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:33,898 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 16:10:38,879 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:38,995 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:39,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:43,362 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:43,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:43,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:45,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:45,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:48,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:48,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:49,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:49,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:49,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:49,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:49,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:49,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,667 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:52,775 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:52,887 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:53,005 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:53,114 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:10:58,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:58,729 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 16:11:00,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:02,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:02,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:04,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:04,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:04,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:05,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:05,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:05,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:06,224 INFO L134 CoverageAnalysis]: Checked inductivity of 40124 backedges. 2511 proven. 5180 refuted. 0 times theorem prover too weak. 32433 trivial. 0 not checked. [2020-07-21 16:11:06,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017476330] [2020-07-21 16:11:06,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:06,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 37] total 43 [2020-07-21 16:11:06,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874918751] [2020-07-21 16:11:06,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-21 16:11:06,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:06,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-21 16:11:06,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1627, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:11:06,227 INFO L87 Difference]: Start difference. First operand 550 states and 881 transitions. Second operand 43 states. [2020-07-21 16:11:18,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:18,020 INFO L93 Difference]: Finished difference Result 1291 states and 2364 transitions. [2020-07-21 16:11:18,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-07-21 16:11:18,025 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 1163 [2020-07-21 16:11:18,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:18,034 INFO L225 Difference]: With dead ends: 1291 [2020-07-21 16:11:18,034 INFO L226 Difference]: Without dead ends: 741 [2020-07-21 16:11:18,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2369 GetRequests, 2251 SyntacticMatches, 33 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1836 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1038, Invalid=6444, Unknown=0, NotChecked=0, Total=7482 [2020-07-21 16:11:18,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2020-07-21 16:11:18,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 660. [2020-07-21 16:11:18,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 660 states. [2020-07-21 16:11:18,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 660 states to 660 states and 1182 transitions. [2020-07-21 16:11:18,074 INFO L78 Accepts]: Start accepts. Automaton has 660 states and 1182 transitions. Word has length 1163 [2020-07-21 16:11:18,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:18,074 INFO L479 AbstractCegarLoop]: Abstraction has 660 states and 1182 transitions. [2020-07-21 16:11:18,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-21 16:11:18,075 INFO L276 IsEmpty]: Start isEmpty. Operand 660 states and 1182 transitions. [2020-07-21 16:11:18,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 608 [2020-07-21 16:11:18,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:18,081 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 44, 44, 27, 27, 23, 23, 23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 22, 22, 20, 17, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:18,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:18,282 INFO L427 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:18,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:18,283 INFO L82 PathProgramCache]: Analyzing trace with hash 648885874, now seen corresponding path program 61 times [2020-07-21 16:11:18,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:18,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073177920] [2020-07-21 16:11:18,284 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:19,679 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:19,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:19,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:11:19,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:20,526 INFO L134 CoverageAnalysis]: Checked inductivity of 10746 backedges. 3023 proven. 51 refuted. 0 times theorem prover too weak. 7672 trivial. 0 not checked. [2020-07-21 16:11:20,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:31,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:31,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:33,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:33,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:33,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:33,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:33,882 INFO L134 CoverageAnalysis]: Checked inductivity of 10746 backedges. 380 proven. 1415 refuted. 0 times theorem prover too weak. 8951 trivial. 0 not checked. [2020-07-21 16:11:33,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073177920] [2020-07-21 16:11:33,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:33,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-21 16:11:33,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560427555] [2020-07-21 16:11:33,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:11:33,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:33,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:11:33,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:11:33,885 INFO L87 Difference]: Start difference. First operand 660 states and 1182 transitions. Second operand 19 states. [2020-07-21 16:11:35,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:35,482 INFO L93 Difference]: Finished difference Result 1322 states and 2525 transitions. [2020-07-21 16:11:35,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:11:35,487 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 607 [2020-07-21 16:11:35,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:35,496 INFO L225 Difference]: With dead ends: 1322 [2020-07-21 16:11:35,496 INFO L226 Difference]: Without dead ends: 668 [2020-07-21 16:11:35,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1224 GetRequests, 1185 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:11:35,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2020-07-21 16:11:35,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 660. [2020-07-21 16:11:35,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 660 states. [2020-07-21 16:11:35,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 660 states to 660 states and 1179 transitions. [2020-07-21 16:11:35,536 INFO L78 Accepts]: Start accepts. Automaton has 660 states and 1179 transitions. Word has length 607 [2020-07-21 16:11:35,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:35,536 INFO L479 AbstractCegarLoop]: Abstraction has 660 states and 1179 transitions. [2020-07-21 16:11:35,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:11:35,536 INFO L276 IsEmpty]: Start isEmpty. Operand 660 states and 1179 transitions. [2020-07-21 16:11:35,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 797 [2020-07-21 16:11:35,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:35,545 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 58, 58, 38, 37, 30, 30, 30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 29, 23, 21, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:35,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:35,747 INFO L427 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:35,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:35,748 INFO L82 PathProgramCache]: Analyzing trace with hash 1774749218, now seen corresponding path program 62 times [2020-07-21 16:11:35,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:35,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688695966] [2020-07-21 16:11:35,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:37,149 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:11:37,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:37,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 1178 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:11:37,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:38,131 INFO L134 CoverageAnalysis]: Checked inductivity of 18665 backedges. 1722 proven. 2452 refuted. 0 times theorem prover too weak. 14491 trivial. 0 not checked. [2020-07-21 16:11:38,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:40,476 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:11:41,138 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:11:41,243 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:11:41,361 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:41,480 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:47,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:48,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:48,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:49,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:49,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:50,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:50,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:50,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:52,768 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:11:53,406 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:11:53,514 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:11:53,633 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:53,755 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:53,862 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:11:59,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:59,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:02,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:05,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:05,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:06,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:06,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:07,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:07,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:07,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:08,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:08,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:08,483 INFO L134 CoverageAnalysis]: Checked inductivity of 18665 backedges. 1722 proven. 2501 refuted. 0 times theorem prover too weak. 14442 trivial. 0 not checked. [2020-07-21 16:12:08,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688695966] [2020-07-21 16:12:08,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:12:08,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:12:08,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846581281] [2020-07-21 16:12:08,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:12:08,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:12:08,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:12:08,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1056, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:12:08,486 INFO L87 Difference]: Start difference. First operand 660 states and 1179 transitions. Second operand 35 states. [2020-07-21 16:12:15,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:12:15,949 INFO L93 Difference]: Finished difference Result 1406 states and 2595 transitions. [2020-07-21 16:12:15,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 16:12:15,957 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 796 [2020-07-21 16:12:15,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:12:15,976 INFO L225 Difference]: With dead ends: 1406 [2020-07-21 16:12:15,976 INFO L226 Difference]: Without dead ends: 752 [2020-07-21 16:12:15,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1621 GetRequests, 1529 SyntacticMatches, 29 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 960 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=622, Invalid=3538, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 16:12:15,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 752 states. [2020-07-21 16:12:16,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 752 to 684. [2020-07-21 16:12:16,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 684 states. [2020-07-21 16:12:16,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 684 states to 684 states and 1243 transitions. [2020-07-21 16:12:16,078 INFO L78 Accepts]: Start accepts. Automaton has 684 states and 1243 transitions. Word has length 796 [2020-07-21 16:12:16,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:12:16,079 INFO L479 AbstractCegarLoop]: Abstraction has 684 states and 1243 transitions. [2020-07-21 16:12:16,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:12:16,080 INFO L276 IsEmpty]: Start isEmpty. Operand 684 states and 1243 transitions. [2020-07-21 16:12:16,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-21 16:12:16,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:12:16,092 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 37, 37, 27, 27, 21, 21, 21, 21, 21, 21, 21, 18, 18, 18, 18, 18, 18, 18, 15, 10, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:12:16,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:16,307 INFO L427 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:12:16,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:12:16,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1281954690, now seen corresponding path program 63 times [2020-07-21 16:12:16,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:12:16,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099242761] [2020-07-21 16:12:16,309 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:18,353 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:12:18,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:12:18,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:12:18,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:12:19,605 INFO L134 CoverageAnalysis]: Checked inductivity of 8262 backedges. 3532 proven. 143 refuted. 0 times theorem prover too weak. 4587 trivial. 0 not checked. [2020-07-21 16:12:19,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:12:20,973 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 16:12:32,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:32,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:32,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:34,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:34,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:36,366 INFO L134 CoverageAnalysis]: Checked inductivity of 8262 backedges. 392 proven. 1423 refuted. 0 times theorem prover too weak. 6447 trivial. 0 not checked. [2020-07-21 16:12:36,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099242761] [2020-07-21 16:12:36,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:12:36,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-21 16:12:36,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220214620] [2020-07-21 16:12:36,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:12:36,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:12:36,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:12:36,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:12:36,368 INFO L87 Difference]: Start difference. First operand 684 states and 1243 transitions. Second operand 23 states. [2020-07-21 16:12:39,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:12:39,253 INFO L93 Difference]: Finished difference Result 1347 states and 2594 transitions. [2020-07-21 16:12:39,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:12:39,259 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 535 [2020-07-21 16:12:39,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:12:39,270 INFO L225 Difference]: With dead ends: 1347 [2020-07-21 16:12:39,270 INFO L226 Difference]: Without dead ends: 667 [2020-07-21 16:12:39,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1083 GetRequests, 1033 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=233, Invalid=1099, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:12:39,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2020-07-21 16:12:39,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 652. [2020-07-21 16:12:39,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 652 states. [2020-07-21 16:12:39,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 652 states to 652 states and 1157 transitions. [2020-07-21 16:12:39,328 INFO L78 Accepts]: Start accepts. Automaton has 652 states and 1157 transitions. Word has length 535 [2020-07-21 16:12:39,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:12:39,328 INFO L479 AbstractCegarLoop]: Abstraction has 652 states and 1157 transitions. [2020-07-21 16:12:39,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:12:39,329 INFO L276 IsEmpty]: Start isEmpty. Operand 652 states and 1157 transitions. [2020-07-21 16:12:39,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-21 16:12:39,333 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:12:39,334 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] [2020-07-21 16:12:39,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:39,535 INFO L427 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:12:39,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:12:39,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1189047008, now seen corresponding path program 64 times [2020-07-21 16:12:39,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:12:39,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012199692] [2020-07-21 16:12:39,537 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:40,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:12:40,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:12:40,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 16:12:41,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:12:41,676 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 4848 proven. 362 refuted. 0 times theorem prover too weak. 3848 trivial. 0 not checked. [2020-07-21 16:12:41,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:12:45,324 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 16:12:55,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:55,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:55,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:55,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:55,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:55,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:57,287 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:59,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:00,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:00,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:01,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:01,615 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 535 proven. 1647 refuted. 0 times theorem prover too weak. 6876 trivial. 0 not checked. [2020-07-21 16:13:01,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012199692] [2020-07-21 16:13:01,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:13:01,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 27 [2020-07-21 16:13:01,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073467571] [2020-07-21 16:13:01,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:13:01,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:13:01,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:13:01,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:13:01,618 INFO L87 Difference]: Start difference. First operand 652 states and 1157 transitions. Second operand 27 states. [2020-07-21 16:13:05,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:13:05,617 INFO L93 Difference]: Finished difference Result 1314 states and 2449 transitions. [2020-07-21 16:13:05,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:13:05,624 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 559 [2020-07-21 16:13:05,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:13:05,632 INFO L225 Difference]: With dead ends: 1314 [2020-07-21 16:13:05,632 INFO L226 Difference]: Without dead ends: 667 [2020-07-21 16:13:05,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1134 GetRequests, 1073 SyntacticMatches, 19 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=323, Invalid=1569, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 16:13:05,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2020-07-21 16:13:05,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 651. [2020-07-21 16:13:05,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 651 states. [2020-07-21 16:13:05,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 651 states to 651 states and 1140 transitions. [2020-07-21 16:13:05,674 INFO L78 Accepts]: Start accepts. Automaton has 651 states and 1140 transitions. Word has length 559 [2020-07-21 16:13:05,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:13:05,675 INFO L479 AbstractCegarLoop]: Abstraction has 651 states and 1140 transitions. [2020-07-21 16:13:05,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:13:05,675 INFO L276 IsEmpty]: Start isEmpty. Operand 651 states and 1140 transitions. [2020-07-21 16:13:05,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 644 [2020-07-21 16:13:05,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:13:05,681 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 47, 47, 27, 27, 25, 25, 25, 25, 25, 25, 25, 23, 23, 23, 23, 23, 23, 23, 23, 20, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:13:05,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:13:05,883 INFO L427 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:13:05,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:13:05,884 INFO L82 PathProgramCache]: Analyzing trace with hash -56036421, now seen corresponding path program 65 times [2020-07-21 16:13:05,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:13:05,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831698041] [2020-07-21 16:13:05,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:13:07,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:13:07,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:13:07,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 16:13:07,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:13:08,268 INFO L134 CoverageAnalysis]: Checked inductivity of 12138 backedges. 6424 proven. 904 refuted. 0 times theorem prover too weak. 4810 trivial. 0 not checked. [2020-07-21 16:13:08,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:13:10,335 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:13:10,439 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:13:11,065 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 16:13:21,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:21,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:22,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:22,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:22,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:22,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:23,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:23,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:25,933 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 33 [2020-07-21 16:13:28,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:28,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:30,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:31,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:31,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:32,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:32,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:32,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:33,190 INFO L134 CoverageAnalysis]: Checked inductivity of 12138 backedges. 832 proven. 2033 refuted. 0 times theorem prover too weak. 9273 trivial. 0 not checked. [2020-07-21 16:13:33,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831698041] [2020-07-21 16:13:33,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:13:33,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 26] total 31 [2020-07-21 16:13:33,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270403108] [2020-07-21 16:13:33,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:13:33,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:13:33,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:13:33,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=818, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:13:33,193 INFO L87 Difference]: Start difference. First operand 651 states and 1140 transitions. Second operand 31 states. [2020-07-21 16:13:39,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:13:39,407 INFO L93 Difference]: Finished difference Result 1271 states and 2316 transitions. [2020-07-21 16:13:39,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:13:39,413 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 643 [2020-07-21 16:13:39,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:13:39,421 INFO L225 Difference]: With dead ends: 1271 [2020-07-21 16:13:39,421 INFO L226 Difference]: Without dead ends: 625 [2020-07-21 16:13:39,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1308 GetRequests, 1233 SyntacticMatches, 23 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=457, Invalid=2405, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 16:13:39,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2020-07-21 16:13:39,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 593. [2020-07-21 16:13:39,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 593 states. [2020-07-21 16:13:39,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 593 states to 593 states and 1036 transitions. [2020-07-21 16:13:39,459 INFO L78 Accepts]: Start accepts. Automaton has 593 states and 1036 transitions. Word has length 643 [2020-07-21 16:13:39,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:13:39,460 INFO L479 AbstractCegarLoop]: Abstraction has 593 states and 1036 transitions. [2020-07-21 16:13:39,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:13:39,460 INFO L276 IsEmpty]: Start isEmpty. Operand 593 states and 1036 transitions. [2020-07-21 16:13:39,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-21 16:13:39,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:13:39,468 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 57, 57, 31, 31, 29, 29, 29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 28, 28, 27, 26, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:13:39,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:13:39,669 INFO L427 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:13:39,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:13:39,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1731449664, now seen corresponding path program 66 times [2020-07-21 16:13:39,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:13:39,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626774197] [2020-07-21 16:13:39,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:13:41,274 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:13:41,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:13:41,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 1693 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:13:41,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:13:42,475 INFO L134 CoverageAnalysis]: Checked inductivity of 17062 backedges. 2290 proven. 1485 refuted. 0 times theorem prover too weak. 13287 trivial. 0 not checked. [2020-07-21 16:13:42,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:13:45,385 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:13:45,596 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-21 16:13:45,705 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-21 16:13:45,820 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:13:45,938 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:13:47,899 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:13:52,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:52,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:54,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:54,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:54,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:55,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:55,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:13:55,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts