/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:25,584 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:21:25,587 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:21:25,600 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:21:25,600 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:25,601 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:25,603 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:25,605 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:25,606 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:25,607 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:25,608 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:25,609 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:25,610 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:25,611 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:25,612 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:25,613 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:25,614 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:25,615 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:25,616 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:25,619 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:25,620 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:25,621 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:25,623 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:25,623 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:25,626 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 13:21:25,626 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 13:21:25,627 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 13:21:25,627 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 13:21:25,628 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 13:21:25,629 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 13:21:25,629 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 13:21:25,630 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 13:21:25,630 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 13:21:25,631 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 13:21:25,632 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 13:21:25,632 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 13:21:25,633 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 13:21:25,633 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 13:21:25,633 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:21:25,634 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:21:25,635 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:21:25,636 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:21:25,651 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:25,652 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:25,653 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:25,653 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:25,653 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:25,654 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:25,654 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:25,654 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:25,654 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:25,654 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:25,655 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:25,655 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:25,655 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:25,655 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:25,655 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:25,656 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:25,656 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:25,656 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:25,656 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:25,656 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:25,657 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:25,657 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:25,657 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:25,657 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:25,658 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:25,658 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:25,658 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:25,658 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:25,658 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:25,659 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:21:25,930 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:25,950 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:25,955 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:25,957 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:25,957 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:25,958 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-20 13:21:26,052 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ddea0ec09/b7c88953f1fc4414bfadce49b47c04dd/FLAG5692cef11 [2020-07-20 13:21:26,543 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:26,545 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-20 13:21:26,553 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ddea0ec09/b7c88953f1fc4414bfadce49b47c04dd/FLAG5692cef11 [2020-07-20 13:21:26,944 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ddea0ec09/b7c88953f1fc4414bfadce49b47c04dd [2020-07-20 13:21:26,957 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:26,961 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:26,963 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:26,963 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:26,967 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:26,968 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:26" (1/1) ... [2020-07-20 13:21:26,971 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32a85603 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:26, skipping insertion in model container [2020-07-20 13:21:26,971 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:26" (1/1) ... [2020-07-20 13:21:26,981 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:27,001 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:27,163 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:27,167 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:27,181 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:27,192 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:27,193 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27 WrapperNode [2020-07-20 13:21:27,193 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:27,193 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:27,194 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:27,194 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:27,206 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... [2020-07-20 13:21:27,207 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... [2020-07-20 13:21:27,297 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... [2020-07-20 13:21:27,297 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... [2020-07-20 13:21:27,307 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... [2020-07-20 13:21:27,309 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... [2020-07-20 13:21:27,310 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... [2020-07-20 13:21:27,312 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:27,314 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:27,314 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:27,314 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:27,315 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:27,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:27,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:27,378 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 13:21:27,378 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 13:21:27,378 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:27,379 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:21:27,379 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:27,379 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 13:21:27,380 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 13:21:27,380 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:27,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:27,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:27,563 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:27,564 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:27,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:27 BoogieIcfgContainer [2020-07-20 13:21:27,569 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:27,570 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:27,570 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:27,574 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:27,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:26" (1/3) ... [2020-07-20 13:21:27,575 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f587457 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:27, skipping insertion in model container [2020-07-20 13:21:27,575 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:27" (2/3) ... [2020-07-20 13:21:27,575 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f587457 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:27, skipping insertion in model container [2020-07-20 13:21:27,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:27" (3/3) ... [2020-07-20 13:21:27,577 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-1.c [2020-07-20 13:21:27,589 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:27,598 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:21:27,621 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:21:27,651 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:27,651 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:27,652 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:27,652 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:27,652 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:27,652 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:27,653 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:27,653 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:27,685 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 13:21:27,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:27,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:27,700 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:27,701 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:27,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:27,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 13:21:27,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:27,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [410229092] [2020-07-20 13:21:27,721 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:27,792 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:27,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:27,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:27,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:27,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:27,904 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:27,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [410229092] [2020-07-20 13:21:27,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:27,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:27,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540436396] [2020-07-20 13:21:27,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:27,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:27,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:27,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:27,928 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 13:21:28,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:28,051 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 13:21:28,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:28,054 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:21:28,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:28,064 INFO L225 Difference]: With dead ends: 44 [2020-07-20 13:21:28,065 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:21:28,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:28,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:21:28,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 13:21:28,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:21:28,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:21:28,115 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 13:21:28,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:28,115 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:21:28,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:28,116 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:21:28,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:21:28,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:28,118 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:28,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:28,332 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:28,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:28,333 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 13:21:28,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:28,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064510716] [2020-07-20 13:21:28,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:28,362 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:28,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:28,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:28,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:28,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:28,407 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:28,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064510716] [2020-07-20 13:21:28,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:28,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:28,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109122734] [2020-07-20 13:21:28,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:28,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:28,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:28,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:28,418 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 13:21:28,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:28,528 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 13:21:28,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:28,530 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:21:28,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:28,532 INFO L225 Difference]: With dead ends: 36 [2020-07-20 13:21:28,534 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 13:21:28,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:28,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 13:21:28,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 13:21:28,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:21:28,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:21:28,558 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 13:21:28,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:28,558 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:21:28,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:28,559 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:21:28,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:21:28,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:28,564 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:28,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:28,780 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:28,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:28,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 13:21:28,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:28,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50793610] [2020-07-20 13:21:28,783 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:28,827 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:28,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:28,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:28,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:28,880 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:28,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:29,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:29,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:29,155 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:29,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50793610] [2020-07-20 13:21:29,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:29,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:21:29,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459335351] [2020-07-20 13:21:29,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:21:29,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:29,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:21:29,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:21:29,169 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 13:21:29,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:29,295 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 13:21:29,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:29,296 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 13:21:29,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:29,298 INFO L225 Difference]: With dead ends: 41 [2020-07-20 13:21:29,299 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 13:21:29,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:29,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 13:21:29,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 13:21:29,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:21:29,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:21:29,309 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 13:21:29,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:29,310 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:21:29,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:21:29,310 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:21:29,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:21:29,312 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:29,312 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:29,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:29,527 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:29,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:29,527 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 13:21:29,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:29,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [878619598] [2020-07-20 13:21:29,528 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:29,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:29,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:29,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:29,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:29,601 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:29,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:29,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:29,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:29,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:29,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [878619598] [2020-07-20 13:21:29,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:29,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:21:29,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305828443] [2020-07-20 13:21:29,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:21:29,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:29,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:21:29,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:21:29,780 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 13:21:29,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:29,883 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 13:21:29,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:29,884 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 13:21:29,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:29,886 INFO L225 Difference]: With dead ends: 46 [2020-07-20 13:21:29,887 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 13:21:29,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:29,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 13:21:29,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 13:21:29,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:21:29,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:21:29,897 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 13:21:29,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:29,897 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:21:29,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:21:29,898 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:21:29,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:21:29,899 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:29,900 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:30,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:30,114 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:30,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:30,115 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 13:21:30,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:30,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586440982] [2020-07-20 13:21:30,117 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:30,148 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:30,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:30,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:30,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:30,229 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:21:30,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:30,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,614 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:30,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586440982] [2020-07-20 13:21:30,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:30,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:21:30,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313731979] [2020-07-20 13:21:30,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:21:30,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:30,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:21:30,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:30,617 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 13:21:30,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:30,782 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 13:21:30,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:30,783 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 13:21:30,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:30,785 INFO L225 Difference]: With dead ends: 51 [2020-07-20 13:21:30,785 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 13:21:30,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:30,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 13:21:30,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 13:21:30,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:21:30,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:21:30,797 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 13:21:30,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:30,797 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:21:30,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:21:30,798 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:21:30,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 13:21:30,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:30,800 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:31,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:31,009 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:31,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:31,010 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 13:21:31,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:31,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164475763] [2020-07-20 13:21:31,012 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:31,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:31,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:31,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:31,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:31,087 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 13:21:31,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:31,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,422 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:31,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164475763] [2020-07-20 13:21:31,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:31,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:21:31,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084571456] [2020-07-20 13:21:31,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:21:31,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:31,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:21:31,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:31,424 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 13:21:31,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:31,591 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 13:21:31,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:31,591 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 13:21:31,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:31,593 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:21:31,594 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 13:21:31,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:31,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 13:21:31,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 13:21:31,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:21:31,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:21:31,605 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 13:21:31,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:31,606 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:21:31,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:21:31,606 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:21:31,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 13:21:31,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:31,609 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:31,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:31,823 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:31,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:31,824 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 13:21:31,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:31,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66525827] [2020-07-20 13:21:31,825 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:31,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:31,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:31,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:31,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:31,974 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 13:21:31,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:32,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,515 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:21:32,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66525827] [2020-07-20 13:21:32,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:32,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:21:32,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566890543] [2020-07-20 13:21:32,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:21:32,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:32,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:21:32,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:32,517 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 13:21:32,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:32,737 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 13:21:32,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:32,737 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 13:21:32,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:32,740 INFO L225 Difference]: With dead ends: 61 [2020-07-20 13:21:32,740 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 13:21:32,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:32,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 13:21:32,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 13:21:32,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:21:32,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:21:32,755 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 13:21:32,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:32,755 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:21:32,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:21:32,755 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:21:32,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 13:21:32,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:32,758 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:32,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:32,965 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:32,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:32,966 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 13:21:32,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:32,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860498294] [2020-07-20 13:21:32,968 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:33,011 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:33,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:33,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:33,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:33,078 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 13:21:33,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:33,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:33,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:33,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:33,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:33,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:33,587 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:21:33,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860498294] [2020-07-20 13:21:33,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:33,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:21:33,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384731507] [2020-07-20 13:21:33,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:21:33,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:33,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:21:33,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:33,592 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 13:21:33,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:33,775 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 13:21:33,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:33,776 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 13:21:33,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:33,779 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:21:33,779 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 13:21:33,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:33,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 13:21:33,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 13:21:33,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:21:33,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:21:33,791 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 13:21:33,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:33,792 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:21:33,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:21:33,792 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:21:33,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 13:21:33,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:33,795 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:34,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:34,003 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:34,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:34,003 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 13:21:34,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:34,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063451260] [2020-07-20 13:21:34,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:34,057 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:34,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:34,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:34,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:34,148 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 13:21:34,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:34,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:35,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:35,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:35,044 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 13:21:35,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063451260] [2020-07-20 13:21:35,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:35,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:21:35,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951988073] [2020-07-20 13:21:35,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:21:35,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:35,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:21:35,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:21:35,046 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 13:21:35,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:35,301 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 13:21:35,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:35,302 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 13:21:35,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:35,304 INFO L225 Difference]: With dead ends: 71 [2020-07-20 13:21:35,305 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 13:21:35,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:35,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 13:21:35,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 13:21:35,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:21:35,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:21:35,318 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 13:21:35,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:35,318 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:21:35,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:21:35,319 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:21:35,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 13:21:35,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:35,321 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:35,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:35,534 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:35,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:35,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 13:21:35,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:35,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680627024] [2020-07-20 13:21:35,536 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:35,598 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:35,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:35,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:35,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:35,692 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 13:21:35,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:36,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,636 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 13:21:36,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680627024] [2020-07-20 13:21:36,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:36,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:21:36,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308912831] [2020-07-20 13:21:36,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:21:36,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:36,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:21:36,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:21:36,639 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 13:21:36,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:36,879 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 13:21:36,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:36,879 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 13:21:36,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:36,881 INFO L225 Difference]: With dead ends: 76 [2020-07-20 13:21:36,881 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:21:36,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:36,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:21:36,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 13:21:36,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:21:36,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:21:36,910 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 13:21:36,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:36,912 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:21:36,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:21:36,913 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:21:36,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 13:21:36,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:36,919 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:37,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:37,134 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:37,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:37,135 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 13:21:37,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:37,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1203918490] [2020-07-20 13:21:37,136 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:37,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:37,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:37,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:37,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:37,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 13:21:37,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:38,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 13:21:38,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1203918490] [2020-07-20 13:21:38,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:38,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:21:38,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987225613] [2020-07-20 13:21:38,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:21:38,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:38,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:21:38,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:38,976 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 13:21:39,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:39,239 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 13:21:39,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:39,240 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 13:21:39,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:39,243 INFO L225 Difference]: With dead ends: 81 [2020-07-20 13:21:39,244 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 13:21:39,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:21:39,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 13:21:39,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 13:21:39,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:21:39,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:21:39,256 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 13:21:39,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:39,257 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:21:39,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:21:39,257 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:21:39,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:21:39,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:39,259 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:39,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:39,475 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:39,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:39,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 13:21:39,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:39,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266996098] [2020-07-20 13:21:39,478 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:39,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:39,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:39,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:39,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:39,639 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 13:21:39,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:40,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,026 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 13:21:41,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266996098] [2020-07-20 13:21:41,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:41,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:21:41,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996130209] [2020-07-20 13:21:41,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:21:41,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:41,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:21:41,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:41,029 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 13:21:41,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:41,302 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 13:21:41,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:41,302 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 13:21:41,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:41,305 INFO L225 Difference]: With dead ends: 86 [2020-07-20 13:21:41,305 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 13:21:41,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:21:41,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 13:21:41,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 13:21:41,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:21:41,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:21:41,316 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 13:21:41,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:41,317 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:21:41,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:21:41,317 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:21:41,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 13:21:41,319 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:41,320 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:41,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:41,532 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:41,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:41,533 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 13:21:41,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:41,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264522452] [2020-07-20 13:21:41,534 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:41,645 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:41,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:41,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:41,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:41,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 13:21:41,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:43,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 13:21:44,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264522452] [2020-07-20 13:21:44,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:44,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:21:44,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030175236] [2020-07-20 13:21:44,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:21:44,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:44,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:21:44,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:44,109 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 13:21:44,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:44,517 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 13:21:44,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:44,518 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 13:21:44,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:44,521 INFO L225 Difference]: With dead ends: 91 [2020-07-20 13:21:44,521 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 13:21:44,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:21:44,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 13:21:44,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 13:21:44,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:21:44,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:21:44,533 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 13:21:44,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:44,534 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:21:44,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:21:44,534 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:21:44,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 13:21:44,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:44,537 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:44,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:44,751 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:44,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:44,752 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 13:21:44,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:44,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066573752] [2020-07-20 13:21:44,753 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:44,881 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:44,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:44,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:44,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:45,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 13:21:45,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:46,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 13:21:47,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066573752] [2020-07-20 13:21:47,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:47,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:21:47,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173977100] [2020-07-20 13:21:47,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:21:47,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:47,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:21:47,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:47,312 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-20 13:21:47,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:47,667 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 13:21:47,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:47,668 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-20 13:21:47,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:47,671 INFO L225 Difference]: With dead ends: 96 [2020-07-20 13:21:47,671 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 13:21:47,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:21:47,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 13:21:47,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 13:21:47,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:21:47,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:21:47,683 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 13:21:47,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:47,684 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:21:47,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:21:47,685 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:21:47,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 13:21:47,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:47,691 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:47,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:47,905 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:47,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:47,905 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 13:21:47,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:47,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073597936] [2020-07-20 13:21:47,906 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:48,102 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:48,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:48,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:48,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:48,247 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 13:21:48,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:50,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:51,926 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 13:21:51,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073597936] [2020-07-20 13:21:51,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:51,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 13:21:51,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446581507] [2020-07-20 13:21:51,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:21:51,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:51,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:21:51,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:21:51,929 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-20 13:21:52,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:52,416 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 13:21:52,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:21:52,417 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-20 13:21:52,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:52,421 INFO L225 Difference]: With dead ends: 101 [2020-07-20 13:21:52,421 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 13:21:52,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:21:52,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 13:21:52,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 13:21:52,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:21:52,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:21:52,434 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 13:21:52,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:52,435 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:21:52,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:21:52,435 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:21:52,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 13:21:52,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:52,441 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:52,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:52,657 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:52,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:52,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-20 13:21:52,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:52,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1538622412] [2020-07-20 13:21:52,658 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:52,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:52,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:52,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:52,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:53,037 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-20 13:21:53,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:55,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:55,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:55,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,895 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-20 13:21:56,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1538622412] [2020-07-20 13:21:56,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:56,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 13:21:56,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465822754] [2020-07-20 13:21:56,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:21:56,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:56,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:21:56,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:21:56,900 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-20 13:21:57,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:57,361 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-20 13:21:57,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:21:57,362 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-20 13:21:57,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:57,365 INFO L225 Difference]: With dead ends: 106 [2020-07-20 13:21:57,365 INFO L226 Difference]: Without dead ends: 102 [2020-07-20 13:21:57,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:21:57,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-20 13:21:57,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-20 13:21:57,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:21:57,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:21:57,377 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-20 13:21:57,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:57,378 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:21:57,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:21:57,378 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:21:57,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 13:21:57,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:57,385 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:57,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:57,601 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:57,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:57,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-20 13:21:57,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:57,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250295474] [2020-07-20 13:21:57,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:57,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:57,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:57,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 1490 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:21:57,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:58,349 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-20 13:21:58,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:02,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:03,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:03,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:03,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:05,301 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-20 13:22:05,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250295474] [2020-07-20 13:22:05,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:05,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 13:22:05,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315581206] [2020-07-20 13:22:05,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:22:05,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:05,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:22:05,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:22:05,305 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-20 13:22:05,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:05,847 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-20 13:22:05,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:05,848 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-20 13:22:05,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:05,853 INFO L225 Difference]: With dead ends: 111 [2020-07-20 13:22:05,853 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 13:22:05,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:22:05,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 13:22:05,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-20 13:22:05,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:22:05,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 13:22:05,867 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-20 13:22:05,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:05,869 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 13:22:05,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:22:05,869 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 13:22:05,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-20 13:22:05,873 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:05,873 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:06,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:06,087 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:06,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:06,088 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-20 13:22:06,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:06,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373690956] [2020-07-20 13:22:06,089 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:06,395 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:06,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:06,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:06,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:06,594 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-20 13:22:06,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:09,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,018 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-20 13:22:12,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373690956] [2020-07-20 13:22:12,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:12,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:22:12,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548749610] [2020-07-20 13:22:12,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:12,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:12,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:12,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:12,020 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-20 13:22:12,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:12,539 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-20 13:22:12,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:12,540 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-20 13:22:12,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:12,545 INFO L225 Difference]: With dead ends: 116 [2020-07-20 13:22:12,545 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 13:22:12,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:12,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 13:22:12,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-20 13:22:12,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:22:12,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 13:22:12,562 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-20 13:22:12,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:12,563 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 13:22:12,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:12,563 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 13:22:12,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-20 13:22:12,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:12,568 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:12,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:12,783 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:12,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:12,783 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-20 13:22:12,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:12,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567381156] [2020-07-20 13:22:12,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:13,168 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:13,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:13,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 1230 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:13,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:13,514 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-20 13:22:13,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:17,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:17,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:18,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:18,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:19,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,824 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-20 13:22:21,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567381156] [2020-07-20 13:22:21,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:21,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:22:21,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039400062] [2020-07-20 13:22:21,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:22:21,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:21,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:22:21,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:22:21,828 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-20 13:22:22,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:22,426 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-20 13:22:22,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:22:22,428 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-20 13:22:22,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:22,431 INFO L225 Difference]: With dead ends: 121 [2020-07-20 13:22:22,432 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 13:22:22,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:22:22,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 13:22:22,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-20 13:22:22,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 13:22:22,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 13:22:22,446 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-20 13:22:22,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:22,447 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 13:22:22,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:22:22,447 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 13:22:22,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-20 13:22:22,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:22,454 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:22,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:22,668 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:22,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:22,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-20 13:22:22,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:22,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592540890] [2020-07-20 13:22:22,669 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:23,151 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:23,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:23,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 1368 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:23,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:23,518 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-20 13:22:23,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:26,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:26,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:28,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:29,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:29,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:29,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,693 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-20 13:22:30,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592540890] [2020-07-20 13:22:30,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:30,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:22:30,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125190390] [2020-07-20 13:22:30,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:30,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:30,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:30,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:30,696 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-20 13:22:31,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:31,285 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-20 13:22:31,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:31,286 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-20 13:22:31,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:31,290 INFO L225 Difference]: With dead ends: 159 [2020-07-20 13:22:31,290 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 13:22:31,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:31,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 13:22:31,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-20 13:22:31,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 13:22:31,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-20 13:22:31,309 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-20 13:22:31,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:31,310 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-20 13:22:31,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:31,310 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-20 13:22:31,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-20 13:22:31,316 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:31,317 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:31,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:31,530 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:31,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:31,531 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-20 13:22:31,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:31,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489196144] [2020-07-20 13:22:31,533 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:32,016 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:32,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:32,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 1387 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:22:32,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:32,341 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-20 13:22:32,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:35,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:35,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:36,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,367 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-20 13:22:38,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489196144] [2020-07-20 13:22:38,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:38,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:22:38,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756930875] [2020-07-20 13:22:38,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:22:38,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:38,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:22:38,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:22:38,370 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-20 13:22:38,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:38,866 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-20 13:22:38,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:38,867 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-20 13:22:38,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:38,872 INFO L225 Difference]: With dead ends: 179 [2020-07-20 13:22:38,872 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 13:22:38,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:22:38,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 13:22:38,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-20 13:22:38,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 13:22:38,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-20 13:22:38,895 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-20 13:22:38,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:38,896 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-20 13:22:38,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:22:38,896 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-20 13:22:38,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-20 13:22:38,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:38,907 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:39,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:39,121 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:39,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:39,122 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-20 13:22:39,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:39,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109143596] [2020-07-20 13:22:39,123 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:39,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:39,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:39,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 1954 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:39,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:40,280 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-20 13:22:40,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:44,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:46,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:46,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:48,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:48,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:48,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:48,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:48,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:48,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:49,860 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-20 13:22:49,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109143596] [2020-07-20 13:22:49,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:49,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:22:49,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298557828] [2020-07-20 13:22:49,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:49,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:49,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:49,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:49,863 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-20 13:22:50,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:50,485 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-20 13:22:50,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:50,489 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-20 13:22:50,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:50,493 INFO L225 Difference]: With dead ends: 156 [2020-07-20 13:22:50,494 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 13:22:50,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:50,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 13:22:50,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-20 13:22:50,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 13:22:50,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-20 13:22:50,512 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-20 13:22:50,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:50,513 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-20 13:22:50,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:50,513 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-20 13:22:50,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-20 13:22:50,521 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:50,522 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:50,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:50,737 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:50,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:50,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-20 13:22:50,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:50,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352822941] [2020-07-20 13:22:50,739 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:51,330 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:51,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:51,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 1771 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:22:51,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:51,872 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-20 13:22:51,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:55,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:57,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:57,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:58,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:59,420 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-20 13:22:59,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352822941] [2020-07-20 13:22:59,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:59,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:22:59,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035220729] [2020-07-20 13:22:59,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:22:59,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:59,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:22:59,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:22:59,423 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-20 13:22:59,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:59,979 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-20 13:22:59,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:59,980 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-20 13:22:59,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:59,985 INFO L225 Difference]: With dead ends: 174 [2020-07-20 13:22:59,985 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 13:22:59,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:22:59,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 13:23:00,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-20 13:23:00,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 13:23:00,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-20 13:23:00,007 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-20 13:23:00,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:00,007 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-20 13:23:00,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:23:00,008 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-20 13:23:00,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-20 13:23:00,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:00,019 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 65, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:00,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:00,235 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:00,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:00,236 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-20 13:23:00,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:00,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277075126] [2020-07-20 13:23:00,237 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:00,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:00,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:00,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 2055 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:23:00,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:01,990 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3594 refuted. 0 times theorem prover too weak. 33876 trivial. 0 not checked. [2020-07-20 13:23:01,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:07,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:09,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:11,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:12,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:12,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:12,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:13,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:14,024 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-20 13:23:14,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277075126] [2020-07-20 13:23:14,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:14,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:23:14,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481782193] [2020-07-20 13:23:14,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:23:14,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:14,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:23:14,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:23:14,027 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-20 13:23:14,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:14,941 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-20 13:23:14,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:23:14,943 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-20 13:23:14,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:14,947 INFO L225 Difference]: With dead ends: 263 [2020-07-20 13:23:14,948 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 13:23:14,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:23:14,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 13:23:14,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-20 13:23:14,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 13:23:14,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-20 13:23:14,983 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-20 13:23:14,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:14,984 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-20 13:23:14,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:23:14,984 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-20 13:23:14,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2020-07-20 13:23:14,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:14,998 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 68, 68, 55, 50, 39, 39, 39, 39, 39, 39, 39, 34, 34, 34, 34, 34, 34, 34, 24, 21, 18, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:15,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:15,211 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:15,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:15,212 INFO L82 PathProgramCache]: Analyzing trace with hash -472403876, now seen corresponding path program 4 times [2020-07-20 13:23:15,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:15,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33712312] [2020-07-20 13:23:15,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:15,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:15,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:15,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 1803 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:23:15,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:16,414 INFO L134 CoverageAnalysis]: Checked inductivity of 29354 backedges. 636 proven. 2738 refuted. 0 times theorem prover too weak. 25980 trivial. 0 not checked. [2020-07-20 13:23:16,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:20,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:22,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:22,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:24,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:25,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:25,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:25,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:25,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:25,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:25,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:25,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:26,076 INFO L134 CoverageAnalysis]: Checked inductivity of 29354 backedges. 638 proven. 2776 refuted. 0 times theorem prover too weak. 25940 trivial. 0 not checked. [2020-07-20 13:23:26,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33712312] [2020-07-20 13:23:26,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:26,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:23:26,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678859691] [2020-07-20 13:23:26,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:23:26,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:26,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:23:26,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:23:26,079 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 23 states. [2020-07-20 13:23:26,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:26,713 INFO L93 Difference]: Finished difference Result 253 states and 882 transitions. [2020-07-20 13:23:26,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:26,714 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 994 [2020-07-20 13:23:26,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:26,722 INFO L225 Difference]: With dead ends: 253 [2020-07-20 13:23:26,722 INFO L226 Difference]: Without dead ends: 239 [2020-07-20 13:23:26,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1996 GetRequests, 1947 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:23:26,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2020-07-20 13:23:26,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 140. [2020-07-20 13:23:26,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 13:23:26,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 319 transitions. [2020-07-20 13:23:26,755 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 319 transitions. Word has length 994 [2020-07-20 13:23:26,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:26,756 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 319 transitions. [2020-07-20 13:23:26,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:23:26,756 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 319 transitions. [2020-07-20 13:23:26,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1358 [2020-07-20 13:23:26,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:26,774 INFO L422 BasicCegarLoop]: trace histogram [108, 108, 91, 91, 81, 75, 54, 54, 54, 54, 54, 54, 54, 45, 45, 45, 45, 45, 45, 45, 33, 30, 27, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:26,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:26,988 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:26,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:26,989 INFO L82 PathProgramCache]: Analyzing trace with hash 190267374, now seen corresponding path program 5 times [2020-07-20 13:23:26,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:26,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373476433] [2020-07-20 13:23:26,991 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:27,769 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:27,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:27,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 2456 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:23:27,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:28,591 INFO L134 CoverageAnalysis]: Checked inductivity of 55191 backedges. 939 proven. 4350 refuted. 0 times theorem prover too weak. 49902 trivial. 0 not checked. [2020-07-20 13:23:28,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:34,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:34,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:37,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:37,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:38,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:40,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:41,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:41,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:41,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:41,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:41,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:42,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:42,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:42,881 INFO L134 CoverageAnalysis]: Checked inductivity of 55191 backedges. 943 proven. 4402 refuted. 0 times theorem prover too weak. 49846 trivial. 0 not checked. [2020-07-20 13:23:42,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373476433] [2020-07-20 13:23:42,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:42,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:23:42,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954921921] [2020-07-20 13:23:42,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:23:42,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:42,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:23:42,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:23:42,884 INFO L87 Difference]: Start difference. First operand 140 states and 319 transitions. Second operand 25 states. [2020-07-20 13:23:44,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:44,112 INFO L93 Difference]: Finished difference Result 403 states and 2104 transitions. [2020-07-20 13:23:44,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:23:44,113 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1357 [2020-07-20 13:23:44,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:44,119 INFO L225 Difference]: With dead ends: 403 [2020-07-20 13:23:44,119 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 13:23:44,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2723 GetRequests, 2669 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:23:44,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 13:23:44,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 150. [2020-07-20 13:23:44,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 13:23:44,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 13:23:44,156 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 1357 [2020-07-20 13:23:44,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:44,157 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 13:23:44,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:23:44,157 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 13:23:44,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 933 [2020-07-20 13:23:44,168 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:44,168 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 67, 67, 54, 49, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 21, 19, 16, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:44,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:44,383 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:44,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:44,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1865506251, now seen corresponding path program 6 times [2020-07-20 13:23:44,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:44,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972598336] [2020-07-20 13:23:44,385 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:45,103 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:45,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:45,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 1686 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:23:45,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:45,569 INFO L134 CoverageAnalysis]: Checked inductivity of 25603 backedges. 533 proven. 2260 refuted. 0 times theorem prover too weak. 22810 trivial. 0 not checked. [2020-07-20 13:23:45,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:49,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:51,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:51,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:52,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:52,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:54,060 INFO L134 CoverageAnalysis]: Checked inductivity of 25603 backedges. 533 proven. 2290 refuted. 0 times theorem prover too weak. 22780 trivial. 0 not checked. [2020-07-20 13:23:54,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972598336] [2020-07-20 13:23:54,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:54,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:23:54,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540165546] [2020-07-20 13:23:54,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:23:54,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:54,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:23:54,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:23:54,063 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 13:23:54,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:54,646 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-20 13:23:54,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:23:54,650 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 932 [2020-07-20 13:23:54,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:54,658 INFO L225 Difference]: With dead ends: 299 [2020-07-20 13:23:54,658 INFO L226 Difference]: Without dead ends: 285 [2020-07-20 13:23:54,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1871 GetRequests, 1827 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:23:54,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-20 13:23:54,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-20 13:23:54,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 13:23:54,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 13:23:54,700 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 932 [2020-07-20 13:23:54,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:54,701 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 13:23:54,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:23:54,701 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 13:23:54,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1253 [2020-07-20 13:23:54,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:54,719 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 90, 90, 75, 72, 46, 46, 46, 46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 45, 30, 26, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:54,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:54,935 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:54,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:54,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1965965054, now seen corresponding path program 7 times [2020-07-20 13:23:54,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:54,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139230662] [2020-07-20 13:23:54,936 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:55,761 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:55,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:55,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 2262 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:23:55,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:56,526 INFO L134 CoverageAnalysis]: Checked inductivity of 46563 backedges. 842 proven. 3998 refuted. 0 times theorem prover too weak. 41723 trivial. 0 not checked. [2020-07-20 13:23:56,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:58,039 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:24:04,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:04,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:06,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:06,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:07,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:08,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:08,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:10,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:10,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:11,020 INFO L134 CoverageAnalysis]: Checked inductivity of 46563 backedges. 846 proven. 4050 refuted. 0 times theorem prover too weak. 41667 trivial. 0 not checked. [2020-07-20 13:24:11,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139230662] [2020-07-20 13:24:11,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:11,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:24:11,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511413942] [2020-07-20 13:24:11,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:24:11,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:11,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:24:11,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:24:11,023 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 25 states. [2020-07-20 13:24:12,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:12,006 INFO L93 Difference]: Finished difference Result 238 states and 729 transitions. [2020-07-20 13:24:12,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:24:12,008 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1252 [2020-07-20 13:24:12,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:12,014 INFO L225 Difference]: With dead ends: 238 [2020-07-20 13:24:12,014 INFO L226 Difference]: Without dead ends: 180 [2020-07-20 13:24:12,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2513 GetRequests, 2459 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:24:12,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-20 13:24:12,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 158. [2020-07-20 13:24:12,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-20 13:24:12,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 384 transitions. [2020-07-20 13:24:12,057 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 384 transitions. Word has length 1252 [2020-07-20 13:24:12,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:12,059 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 384 transitions. [2020-07-20 13:24:12,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:24:12,059 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 384 transitions. [2020-07-20 13:24:12,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 951 [2020-07-20 13:24:12,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:12,082 INFO L422 BasicCegarLoop]: trace histogram [72, 72, 67, 67, 55, 54, 36, 36, 36, 36, 36, 36, 36, 33, 33, 33, 33, 33, 33, 33, 22, 18, 17, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:12,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:12,297 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:12,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:12,298 INFO L82 PathProgramCache]: Analyzing trace with hash 515809666, now seen corresponding path program 8 times [2020-07-20 13:24:12,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:12,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043031256] [2020-07-20 13:24:12,298 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:13,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:13,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:13,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 1721 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:24:13,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:13,600 INFO L134 CoverageAnalysis]: Checked inductivity of 26616 backedges. 572 proven. 2327 refuted. 0 times theorem prover too weak. 23717 trivial. 0 not checked. [2020-07-20 13:24:13,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:18,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:21,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:21,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:22,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:22,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:22,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:22,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:22,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:23,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:23,693 INFO L134 CoverageAnalysis]: Checked inductivity of 26616 backedges. 574 proven. 2358 refuted. 0 times theorem prover too weak. 23684 trivial. 0 not checked. [2020-07-20 13:24:23,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043031256] [2020-07-20 13:24:23,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:23,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:24:23,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812498210] [2020-07-20 13:24:23,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:24:23,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:23,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:24:23,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:24:23,695 INFO L87 Difference]: Start difference. First operand 158 states and 384 transitions. Second operand 21 states. [2020-07-20 13:24:24,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:24,290 INFO L93 Difference]: Finished difference Result 259 states and 851 transitions. [2020-07-20 13:24:24,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:24:24,292 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 950 [2020-07-20 13:24:24,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:24,299 INFO L225 Difference]: With dead ends: 259 [2020-07-20 13:24:24,299 INFO L226 Difference]: Without dead ends: 245 [2020-07-20 13:24:24,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1907 GetRequests, 1863 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:24:24,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2020-07-20 13:24:24,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 178. [2020-07-20 13:24:24,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2020-07-20 13:24:24,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 483 transitions. [2020-07-20 13:24:24,335 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 483 transitions. Word has length 950 [2020-07-20 13:24:24,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:24,336 INFO L479 AbstractCegarLoop]: Abstraction has 178 states and 483 transitions. [2020-07-20 13:24:24,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:24:24,336 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 483 transitions. [2020-07-20 13:24:24,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1022 [2020-07-20 13:24:24,351 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:24,352 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 70, 70, 54, 54, 40, 40, 40, 40, 40, 40, 40, 35, 35, 35, 35, 35, 35, 35, 27, 19, 16, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:24,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:24,565 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:24,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:24,566 INFO L82 PathProgramCache]: Analyzing trace with hash -977011164, now seen corresponding path program 9 times [2020-07-20 13:24:24,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:24,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795126565] [2020-07-20 13:24:24,567 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:25,484 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:25,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:25,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 1852 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:24:25,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:26,071 INFO L134 CoverageAnalysis]: Checked inductivity of 30982 backedges. 661 proven. 2811 refuted. 0 times theorem prover too weak. 27510 trivial. 0 not checked. [2020-07-20 13:24:26,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:31,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:34,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:34,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:36,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:36,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:37,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:37,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:37,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:37,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:37,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:37,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:38,574 INFO L134 CoverageAnalysis]: Checked inductivity of 30982 backedges. 663 proven. 2849 refuted. 0 times theorem prover too weak. 27470 trivial. 0 not checked. [2020-07-20 13:24:38,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795126565] [2020-07-20 13:24:38,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:38,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:24:38,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268397998] [2020-07-20 13:24:38,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:24:38,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:38,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:24:38,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:24:38,576 INFO L87 Difference]: Start difference. First operand 178 states and 483 transitions. Second operand 23 states. [2020-07-20 13:24:39,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:39,243 INFO L93 Difference]: Finished difference Result 267 states and 914 transitions. [2020-07-20 13:24:39,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:24:39,244 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1021 [2020-07-20 13:24:39,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:39,251 INFO L225 Difference]: With dead ends: 267 [2020-07-20 13:24:39,251 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 13:24:39,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2050 GetRequests, 2001 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:24:39,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 13:24:39,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 179. [2020-07-20 13:24:39,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 13:24:39,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 489 transitions. [2020-07-20 13:24:39,288 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 489 transitions. Word has length 1021 [2020-07-20 13:24:39,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:39,289 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 489 transitions. [2020-07-20 13:24:39,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:24:39,289 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 489 transitions. [2020-07-20 13:24:39,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1071 [2020-07-20 13:24:39,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:39,305 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 77, 77, 61, 60, 40, 40, 40, 40, 40, 40, 40, 38, 38, 38, 38, 38, 38, 38, 22, 21, 20, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:39,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:39,519 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:39,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:39,519 INFO L82 PathProgramCache]: Analyzing trace with hash 944178213, now seen corresponding path program 10 times [2020-07-20 13:24:39,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:39,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122967756] [2020-07-20 13:24:39,520 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:40,468 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:40,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:40,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 1937 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:24:40,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:41,110 INFO L134 CoverageAnalysis]: Checked inductivity of 33876 backedges. 676 proven. 2556 refuted. 0 times theorem prover too weak. 30644 trivial. 0 not checked. [2020-07-20 13:24:41,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:46,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:48,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:49,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:49,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:50,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:50,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:50,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:50,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:50,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:50,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:50,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:51,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:51,735 INFO L134 CoverageAnalysis]: Checked inductivity of 33876 backedges. 676 proven. 2588 refuted. 0 times theorem prover too weak. 30612 trivial. 0 not checked. [2020-07-20 13:24:51,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122967756] [2020-07-20 13:24:51,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:51,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:24:51,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777857943] [2020-07-20 13:24:51,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:24:51,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:51,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:24:51,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:24:51,737 INFO L87 Difference]: Start difference. First operand 179 states and 489 transitions. Second operand 21 states. [2020-07-20 13:24:52,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:52,373 INFO L93 Difference]: Finished difference Result 295 states and 1090 transitions. [2020-07-20 13:24:52,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:24:52,375 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1070 [2020-07-20 13:24:52,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:52,381 INFO L225 Difference]: With dead ends: 295 [2020-07-20 13:24:52,381 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 13:24:52,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2147 GetRequests, 2103 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:24:52,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 13:24:52,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 173. [2020-07-20 13:24:52,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 13:24:52,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 13:24:52,417 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1070 [2020-07-20 13:24:52,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:52,418 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 13:24:52,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:24:52,418 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 13:24:52,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 13:24:52,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:52,430 INFO L422 BasicCegarLoop]: trace histogram [63, 63, 56, 56, 51, 47, 31, 31, 31, 31, 31, 31, 31, 28, 28, 28, 28, 28, 28, 28, 23, 16, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:52,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:52,644 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:52,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:52,644 INFO L82 PathProgramCache]: Analyzing trace with hash 1785811344, now seen corresponding path program 11 times [2020-07-20 13:24:52,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:52,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827460735] [2020-07-20 13:24:52,645 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:53,541 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:53,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:53,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 1480 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:24:53,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:53,880 INFO L134 CoverageAnalysis]: Checked inductivity of 19700 backedges. 532 proven. 1645 refuted. 0 times theorem prover too weak. 17523 trivial. 0 not checked. [2020-07-20 13:24:53,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:57,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:57,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:59,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:00,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:00,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:02,381 INFO L134 CoverageAnalysis]: Checked inductivity of 19700 backedges. 532 proven. 1669 refuted. 0 times theorem prover too weak. 17499 trivial. 0 not checked. [2020-07-20 13:25:02,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827460735] [2020-07-20 13:25:02,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:02,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:25:02,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857344695] [2020-07-20 13:25:02,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:25:02,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:02,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:25:02,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:25:02,383 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 19 states. [2020-07-20 13:25:03,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:03,048 INFO L93 Difference]: Finished difference Result 348 states and 1590 transitions. [2020-07-20 13:25:03,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:25:03,050 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 819 [2020-07-20 13:25:03,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:03,058 INFO L225 Difference]: With dead ends: 348 [2020-07-20 13:25:03,058 INFO L226 Difference]: Without dead ends: 334 [2020-07-20 13:25:03,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1644 GetRequests, 1605 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:25:03,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-07-20 13:25:03,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 175. [2020-07-20 13:25:03,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 13:25:03,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 473 transitions. [2020-07-20 13:25:03,108 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 473 transitions. Word has length 819 [2020-07-20 13:25:03,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:03,109 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 473 transitions. [2020-07-20 13:25:03,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:25:03,109 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 473 transitions. [2020-07-20 13:25:03,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1169 [2020-07-20 13:25:03,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:03,125 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 83, 83, 71, 64, 44, 44, 44, 44, 44, 44, 44, 41, 41, 41, 41, 41, 41, 41, 30, 20, 19, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:03,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:03,339 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:03,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:03,340 INFO L82 PathProgramCache]: Analyzing trace with hash -1724043302, now seen corresponding path program 12 times [2020-07-20 13:25:03,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:03,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689399893] [2020-07-20 13:25:03,340 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:04,294 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:04,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:04,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 2111 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:25:04,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:05,212 INFO L134 CoverageAnalysis]: Checked inductivity of 40489 backedges. 1130 proven. 3370 refuted. 0 times theorem prover too weak. 35989 trivial. 0 not checked. [2020-07-20 13:25:05,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:13,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:13,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:16,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:16,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:19,921 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:25:20,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:21,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:21,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:22,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:22,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:22,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:24,836 INFO L134 CoverageAnalysis]: Checked inductivity of 40489 backedges. 1132 proven. 3424 refuted. 0 times theorem prover too weak. 35933 trivial. 0 not checked. [2020-07-20 13:25:24,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689399893] [2020-07-20 13:25:24,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:24,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:25:24,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592142451] [2020-07-20 13:25:24,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:25:24,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:24,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:25:24,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:25:24,839 INFO L87 Difference]: Start difference. First operand 175 states and 473 transitions. Second operand 25 states. [2020-07-20 13:25:25,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:25,918 INFO L93 Difference]: Finished difference Result 246 states and 752 transitions. [2020-07-20 13:25:25,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:25:25,921 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1168 [2020-07-20 13:25:25,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:25,924 INFO L225 Difference]: With dead ends: 246 [2020-07-20 13:25:25,925 INFO L226 Difference]: Without dead ends: 200 [2020-07-20 13:25:25,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2345 GetRequests, 2291 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:25:25,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2020-07-20 13:25:25,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 194. [2020-07-20 13:25:25,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-20 13:25:25,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 510 transitions. [2020-07-20 13:25:25,955 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 510 transitions. Word has length 1168 [2020-07-20 13:25:25,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:25,956 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 510 transitions. [2020-07-20 13:25:25,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:25:25,956 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 510 transitions. [2020-07-20 13:25:25,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 924 [2020-07-20 13:25:25,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:25,970 INFO L422 BasicCegarLoop]: trace histogram [69, 69, 66, 66, 54, 52, 34, 34, 34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 33, 21, 18, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:26,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:26,186 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:26,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:26,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1696330326, now seen corresponding path program 13 times [2020-07-20 13:25:26,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:26,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127140181] [2020-07-20 13:25:26,187 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:27,132 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:27,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:27,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 1671 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:25:27,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:27,662 INFO L134 CoverageAnalysis]: Checked inductivity of 25077 backedges. 598 proven. 2160 refuted. 0 times theorem prover too weak. 22319 trivial. 0 not checked. [2020-07-20 13:25:27,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:34,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:34,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:36,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:36,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:37,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:37,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:38,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:38,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:38,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:39,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:39,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:39,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:39,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:39,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:40,267 INFO L134 CoverageAnalysis]: Checked inductivity of 25077 backedges. 600 proven. 2188 refuted. 0 times theorem prover too weak. 22289 trivial. 0 not checked. [2020-07-20 13:25:40,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127140181] [2020-07-20 13:25:40,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:40,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:25:40,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709195230] [2020-07-20 13:25:40,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:25:40,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:40,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:25:40,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:25:40,269 INFO L87 Difference]: Start difference. First operand 194 states and 510 transitions. Second operand 21 states. [2020-07-20 13:25:40,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:40,988 INFO L93 Difference]: Finished difference Result 285 states and 935 transitions. [2020-07-20 13:25:40,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:25:40,991 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 923 [2020-07-20 13:25:40,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:40,996 INFO L225 Difference]: With dead ends: 285 [2020-07-20 13:25:40,996 INFO L226 Difference]: Without dead ends: 271 [2020-07-20 13:25:40,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1853 GetRequests, 1809 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:25:40,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-20 13:25:41,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 192. [2020-07-20 13:25:41,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 13:25:41,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 495 transitions. [2020-07-20 13:25:41,031 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 495 transitions. Word has length 923 [2020-07-20 13:25:41,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:41,031 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 495 transitions. [2020-07-20 13:25:41,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:25:41,032 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 495 transitions. [2020-07-20 13:25:41,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1311 [2020-07-20 13:25:41,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:41,050 INFO L422 BasicCegarLoop]: trace histogram [102, 102, 89, 89, 79, 78, 51, 51, 51, 51, 51, 51, 51, 44, 44, 44, 44, 44, 44, 44, 34, 28, 24, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:41,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:41,263 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:41,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:41,263 INFO L82 PathProgramCache]: Analyzing trace with hash -36113890, now seen corresponding path program 14 times [2020-07-20 13:25:41,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:41,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891849167] [2020-07-20 13:25:41,264 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:42,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:42,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:42,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 2368 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:25:42,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:43,105 INFO L134 CoverageAnalysis]: Checked inductivity of 51236 backedges. 792 proven. 3295 refuted. 0 times theorem prover too weak. 47149 trivial. 0 not checked. [2020-07-20 13:25:43,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:51,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:54,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:55,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:55,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:56,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:56,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:56,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:56,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:56,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:56,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:57,841 INFO L134 CoverageAnalysis]: Checked inductivity of 51236 backedges. 794 proven. 3326 refuted. 0 times theorem prover too weak. 47116 trivial. 0 not checked. [2020-07-20 13:25:57,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891849167] [2020-07-20 13:25:57,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:57,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:25:57,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081637234] [2020-07-20 13:25:57,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:25:57,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:57,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:25:57,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:25:57,844 INFO L87 Difference]: Start difference. First operand 192 states and 495 transitions. Second operand 21 states. [2020-07-20 13:25:58,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:58,555 INFO L93 Difference]: Finished difference Result 296 states and 1016 transitions. [2020-07-20 13:25:58,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:25:58,558 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1310 [2020-07-20 13:25:58,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:58,564 INFO L225 Difference]: With dead ends: 296 [2020-07-20 13:25:58,564 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 13:25:58,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2627 GetRequests, 2583 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:25:58,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 13:25:58,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 215. [2020-07-20 13:25:58,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 13:25:58,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 622 transitions. [2020-07-20 13:25:58,594 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 622 transitions. Word has length 1310 [2020-07-20 13:25:58,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:58,594 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 622 transitions. [2020-07-20 13:25:58,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:25:58,594 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 622 transitions. [2020-07-20 13:25:58,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1383 [2020-07-20 13:25:58,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:58,608 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 94, 94, 80, 77, 54, 54, 54, 54, 54, 54, 54, 47, 47, 47, 47, 47, 47, 47, 32, 30, 26, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:58,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:58,809 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:58,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:58,810 INFO L82 PathProgramCache]: Analyzing trace with hash 194346284, now seen corresponding path program 15 times [2020-07-20 13:25:58,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:58,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141044676] [2020-07-20 13:25:58,811 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:59,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:59,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:59,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 2501 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:25:59,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:00,709 INFO L134 CoverageAnalysis]: Checked inductivity of 57162 backedges. 842 proven. 4018 refuted. 0 times theorem prover too weak. 52302 trivial. 0 not checked. [2020-07-20 13:26:00,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:10,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:10,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:13,287 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 13:26:14,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:15,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:16,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:18,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:19,488 INFO L134 CoverageAnalysis]: Checked inductivity of 57162 backedges. 850 proven. 4054 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-20 13:26:19,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141044676] [2020-07-20 13:26:19,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:19,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:26:19,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505054218] [2020-07-20 13:26:19,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:26:19,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:19,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:26:19,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:26:19,492 INFO L87 Difference]: Start difference. First operand 215 states and 622 transitions. Second operand 23 states. [2020-07-20 13:26:20,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:20,449 INFO L93 Difference]: Finished difference Result 356 states and 1333 transitions. [2020-07-20 13:26:20,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:26:20,451 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1382 [2020-07-20 13:26:20,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:20,457 INFO L225 Difference]: With dead ends: 356 [2020-07-20 13:26:20,458 INFO L226 Difference]: Without dead ends: 284 [2020-07-20 13:26:20,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2772 GetRequests, 2723 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:26:20,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2020-07-20 13:26:20,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 244. [2020-07-20 13:26:20,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-20 13:26:20,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 738 transitions. [2020-07-20 13:26:20,496 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 738 transitions. Word has length 1382 [2020-07-20 13:26:20,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:20,496 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 738 transitions. [2020-07-20 13:26:20,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:26:20,497 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 738 transitions. [2020-07-20 13:26:20,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1025 [2020-07-20 13:26:20,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:20,513 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 70, 70, 56, 55, 40, 40, 40, 40, 40, 40, 40, 35, 35, 35, 35, 35, 35, 35, 25, 21, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:20,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:20,728 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:20,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:20,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1413145724, now seen corresponding path program 16 times [2020-07-20 13:26:20,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:20,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384807102] [2020-07-20 13:26:20,730 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:21,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:21,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:21,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 1853 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:26:21,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:22,343 INFO L134 CoverageAnalysis]: Checked inductivity of 31145 backedges. 845 proven. 2639 refuted. 0 times theorem prover too weak. 27661 trivial. 0 not checked. [2020-07-20 13:26:22,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:27,921 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 13:26:29,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:32,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:32,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:34,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:34,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:35,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:35,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:35,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:35,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:36,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:36,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:37,590 INFO L134 CoverageAnalysis]: Checked inductivity of 31145 backedges. 849 proven. 2675 refuted. 0 times theorem prover too weak. 27621 trivial. 0 not checked. [2020-07-20 13:26:37,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384807102] [2020-07-20 13:26:37,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:37,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:26:37,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907730087] [2020-07-20 13:26:37,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:26:37,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:37,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:26:37,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:26:37,593 INFO L87 Difference]: Start difference. First operand 244 states and 738 transitions. Second operand 23 states. [2020-07-20 13:26:38,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:38,642 INFO L93 Difference]: Finished difference Result 332 states and 1206 transitions. [2020-07-20 13:26:38,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:26:38,645 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1024 [2020-07-20 13:26:38,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:38,652 INFO L225 Difference]: With dead ends: 332 [2020-07-20 13:26:38,652 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 13:26:38,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2056 GetRequests, 2007 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:26:38,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 13:26:38,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 248. [2020-07-20 13:26:38,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 13:26:38,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 722 transitions. [2020-07-20 13:26:38,687 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 722 transitions. Word has length 1024 [2020-07-20 13:26:38,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:38,688 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 722 transitions. [2020-07-20 13:26:38,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:26:38,689 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 722 transitions. [2020-07-20 13:26:38,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1087 [2020-07-20 13:26:38,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:38,705 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 78, 78, 63, 62, 40, 40, 40, 40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 39, 24, 22, 18, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:38,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:38,919 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:38,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:38,920 INFO L82 PathProgramCache]: Analyzing trace with hash 322283262, now seen corresponding path program 17 times [2020-07-20 13:26:38,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:38,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649821042] [2020-07-20 13:26:38,921 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:40,105 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:40,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:40,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 1966 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:26:40,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:40,694 INFO L134 CoverageAnalysis]: Checked inductivity of 34900 backedges. 818 proven. 2462 refuted. 0 times theorem prover too weak. 31620 trivial. 0 not checked. [2020-07-20 13:26:40,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:48,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:52,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:52,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:55,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:55,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:55,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:56,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:56,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:56,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:56,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:56,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:58,299 INFO L134 CoverageAnalysis]: Checked inductivity of 34900 backedges. 820 proven. 2490 refuted. 0 times theorem prover too weak. 31590 trivial. 0 not checked. [2020-07-20 13:26:58,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649821042] [2020-07-20 13:26:58,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:58,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:26:58,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958842249] [2020-07-20 13:26:58,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:26:58,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:58,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:26:58,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:26:58,302 INFO L87 Difference]: Start difference. First operand 248 states and 722 transitions. Second operand 21 states. [2020-07-20 13:26:59,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:59,240 INFO L93 Difference]: Finished difference Result 400 states and 1594 transitions. [2020-07-20 13:26:59,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:26:59,244 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1086 [2020-07-20 13:26:59,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:59,252 INFO L225 Difference]: With dead ends: 400 [2020-07-20 13:26:59,252 INFO L226 Difference]: Without dead ends: 383 [2020-07-20 13:26:59,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2179 GetRequests, 2135 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:26:59,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-07-20 13:26:59,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 238. [2020-07-20 13:26:59,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 13:26:59,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 653 transitions. [2020-07-20 13:26:59,304 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 653 transitions. Word has length 1086 [2020-07-20 13:26:59,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:59,305 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 653 transitions. [2020-07-20 13:26:59,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:26:59,305 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 653 transitions. [2020-07-20 13:26:59,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1089 [2020-07-20 13:26:59,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:59,322 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 79, 79, 64, 63, 40, 40, 40, 40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 39, 25, 23, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:59,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:59,535 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:59,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:59,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1938132832, now seen corresponding path program 18 times [2020-07-20 13:26:59,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:59,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463178034] [2020-07-20 13:26:59,536 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:00,657 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:00,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:00,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 1966 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:27:00,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:01,289 INFO L134 CoverageAnalysis]: Checked inductivity of 35017 backedges. 768 proven. 2154 refuted. 0 times theorem prover too weak. 32095 trivial. 0 not checked. [2020-07-20 13:27:01,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:09,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:09,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:13,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:13,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:16,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:16,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:16,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:16,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:17,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:17,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:17,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:19,418 INFO L134 CoverageAnalysis]: Checked inductivity of 35017 backedges. 768 proven. 2180 refuted. 0 times theorem prover too weak. 32069 trivial. 0 not checked. [2020-07-20 13:27:19,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463178034] [2020-07-20 13:27:19,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:19,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:27:19,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665049117] [2020-07-20 13:27:19,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:27:19,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:19,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:27:19,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:27:19,421 INFO L87 Difference]: Start difference. First operand 238 states and 653 transitions. Second operand 19 states. [2020-07-20 13:27:20,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:20,464 INFO L93 Difference]: Finished difference Result 489 states and 2374 transitions. [2020-07-20 13:27:20,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:27:20,470 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1088 [2020-07-20 13:27:20,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:20,483 INFO L225 Difference]: With dead ends: 489 [2020-07-20 13:27:20,483 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 13:27:20,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2182 GetRequests, 2143 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:27:20,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 13:27:20,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 240. [2020-07-20 13:27:20,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 13:27:20,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-20 13:27:20,540 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 1088 [2020-07-20 13:27:20,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:20,541 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-20 13:27:20,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:27:20,541 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-20 13:27:20,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1036 [2020-07-20 13:27:20,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:20,554 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 70, 70, 62, 60, 40, 40, 40, 40, 40, 40, 40, 35, 35, 35, 35, 35, 35, 35, 25, 22, 21, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:20,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:20,770 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:20,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:20,771 INFO L82 PathProgramCache]: Analyzing trace with hash 426572108, now seen corresponding path program 19 times [2020-07-20 13:27:20,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:20,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302975079] [2020-07-20 13:27:20,772 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:21,915 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:21,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:21,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 1872 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:27:21,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:22,656 INFO L134 CoverageAnalysis]: Checked inductivity of 31781 backedges. 943 proven. 2365 refuted. 0 times theorem prover too weak. 28473 trivial. 0 not checked. [2020-07-20 13:27:22,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:31,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:31,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:34,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:34,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:37,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:38,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:38,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:39,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:39,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:39,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:39,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:39,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:39,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:40,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:41,278 INFO L134 CoverageAnalysis]: Checked inductivity of 31781 backedges. 953 proven. 2387 refuted. 0 times theorem prover too weak. 28441 trivial. 0 not checked. [2020-07-20 13:27:41,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302975079] [2020-07-20 13:27:41,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:41,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:27:41,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995440414] [2020-07-20 13:27:41,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:27:41,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:41,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:27:41,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:27:41,281 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 21 states. [2020-07-20 13:27:42,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:42,392 INFO L93 Difference]: Finished difference Result 428 states and 1691 transitions. [2020-07-20 13:27:42,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:27:42,396 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1035 [2020-07-20 13:27:42,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:42,403 INFO L225 Difference]: With dead ends: 428 [2020-07-20 13:27:42,404 INFO L226 Difference]: Without dead ends: 382 [2020-07-20 13:27:42,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2077 GetRequests, 2033 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:27:42,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2020-07-20 13:27:42,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 266. [2020-07-20 13:27:42,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-07-20 13:27:42,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 797 transitions. [2020-07-20 13:27:42,444 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 797 transitions. Word has length 1035 [2020-07-20 13:27:42,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:42,444 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 797 transitions. [2020-07-20 13:27:42,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:27:42,445 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 797 transitions. [2020-07-20 13:27:42,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1253 [2020-07-20 13:27:42,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:42,458 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 89, 89, 77, 70, 47, 47, 47, 47, 47, 47, 47, 44, 44, 44, 44, 44, 44, 44, 33, 23, 19, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:42,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:42,659 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:42,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:42,660 INFO L82 PathProgramCache]: Analyzing trace with hash -1659143248, now seen corresponding path program 20 times [2020-07-20 13:27:42,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:42,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819866024] [2020-07-20 13:27:42,661 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:43,946 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:43,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:43,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 2262 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:27:43,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:44,661 INFO L134 CoverageAnalysis]: Checked inductivity of 46597 backedges. 734 proven. 3151 refuted. 0 times theorem prover too weak. 42712 trivial. 0 not checked. [2020-07-20 13:27:44,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:48,381 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:27:57,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:01,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:01,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:03,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:03,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:04,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:04,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:05,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:06,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:07,244 INFO L134 CoverageAnalysis]: Checked inductivity of 46597 backedges. 746 proven. 3174 refuted. 0 times theorem prover too weak. 42677 trivial. 0 not checked. [2020-07-20 13:28:07,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819866024] [2020-07-20 13:28:07,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:07,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:28:07,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531104543] [2020-07-20 13:28:07,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:28:07,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:07,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:28:07,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:28:07,246 INFO L87 Difference]: Start difference. First operand 266 states and 797 transitions. Second operand 21 states. [2020-07-20 13:28:08,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:08,360 INFO L93 Difference]: Finished difference Result 384 states and 1364 transitions. [2020-07-20 13:28:08,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:28:08,364 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1252 [2020-07-20 13:28:08,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:08,371 INFO L225 Difference]: With dead ends: 384 [2020-07-20 13:28:08,371 INFO L226 Difference]: Without dead ends: 323 [2020-07-20 13:28:08,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2511 GetRequests, 2467 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:28:08,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-20 13:28:08,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 245. [2020-07-20 13:28:08,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2020-07-20 13:28:08,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 675 transitions. [2020-07-20 13:28:08,401 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 675 transitions. Word has length 1252 [2020-07-20 13:28:08,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:08,402 INFO L479 AbstractCegarLoop]: Abstraction has 245 states and 675 transitions. [2020-07-20 13:28:08,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:28:08,402 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 675 transitions. [2020-07-20 13:28:08,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1152 [2020-07-20 13:28:08,413 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:08,414 INFO L422 BasicCegarLoop]: trace histogram [89, 89, 80, 80, 67, 63, 44, 44, 44, 44, 44, 44, 44, 40, 40, 40, 40, 40, 40, 40, 27, 22, 19, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:08,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:08,615 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:08,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:08,616 INFO L82 PathProgramCache]: Analyzing trace with hash -744030555, now seen corresponding path program 21 times [2020-07-20 13:28:08,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:08,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012882528] [2020-07-20 13:28:08,617 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:09,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:09,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:09,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 2082 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:28:09,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:10,527 INFO L134 CoverageAnalysis]: Checked inductivity of 39372 backedges. 1020 proven. 2980 refuted. 0 times theorem prover too weak. 35372 trivial. 0 not checked. [2020-07-20 13:28:10,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:14,449 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:28:21,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:28,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:31,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:31,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:32,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:34,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:35,485 INFO L134 CoverageAnalysis]: Checked inductivity of 39372 backedges. 1024 proven. 3022 refuted. 0 times theorem prover too weak. 35326 trivial. 0 not checked. [2020-07-20 13:28:35,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012882528] [2020-07-20 13:28:35,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:35,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:28:35,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526522641] [2020-07-20 13:28:35,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:28:35,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:35,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:28:35,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:28:35,488 INFO L87 Difference]: Start difference. First operand 245 states and 675 transitions. Second operand 23 states. [2020-07-20 13:28:37,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:37,195 INFO L93 Difference]: Finished difference Result 405 states and 1469 transitions. [2020-07-20 13:28:37,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:28:37,200 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1151 [2020-07-20 13:28:37,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:37,214 INFO L225 Difference]: With dead ends: 405 [2020-07-20 13:28:37,214 INFO L226 Difference]: Without dead ends: 362 [2020-07-20 13:28:37,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2310 GetRequests, 2261 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:28:37,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-07-20 13:28:37,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 230. [2020-07-20 13:28:37,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-07-20 13:28:37,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 630 transitions. [2020-07-20 13:28:37,283 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 630 transitions. Word has length 1151 [2020-07-20 13:28:37,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:37,284 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 630 transitions. [2020-07-20 13:28:37,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:28:37,284 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 630 transitions. [2020-07-20 13:28:37,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 870 [2020-07-20 13:28:37,312 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:37,312 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 52, 48, 32, 32, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 31, 21, 16, 15, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:37,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:37,526 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:37,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:37,527 INFO L82 PathProgramCache]: Analyzing trace with hash 1410180168, now seen corresponding path program 22 times [2020-07-20 13:28:37,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:37,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129346723] [2020-07-20 13:28:37,528 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:38,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:38,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:38,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 1575 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:28:38,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:39,221 INFO L134 CoverageAnalysis]: Checked inductivity of 22174 backedges. 698 proven. 1602 refuted. 0 times theorem prover too weak. 19874 trivial. 0 not checked. [2020-07-20 13:28:39,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:45,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:45,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:47,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:49,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:50,448 WARN L193 SmtUtils]: Spent 885.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:28:50,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:50,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:51,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:51,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:51,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:51,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:52,916 INFO L134 CoverageAnalysis]: Checked inductivity of 22174 backedges. 700 proven. 1624 refuted. 0 times theorem prover too weak. 19850 trivial. 0 not checked. [2020-07-20 13:28:52,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129346723] [2020-07-20 13:28:52,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:52,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:28:52,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703726121] [2020-07-20 13:28:52,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:28:52,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:52,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:28:52,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:28:52,919 INFO L87 Difference]: Start difference. First operand 230 states and 630 transitions. Second operand 19 states. [2020-07-20 13:28:54,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:54,003 INFO L93 Difference]: Finished difference Result 394 states and 1535 transitions. [2020-07-20 13:28:54,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:28:54,008 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 869 [2020-07-20 13:28:54,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:54,018 INFO L225 Difference]: With dead ends: 394 [2020-07-20 13:28:54,019 INFO L226 Difference]: Without dead ends: 376 [2020-07-20 13:28:54,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1744 GetRequests, 1705 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:28:54,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-20 13:28:54,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 241. [2020-07-20 13:28:54,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2020-07-20 13:28:54,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 674 transitions. [2020-07-20 13:28:54,068 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 674 transitions. Word has length 869 [2020-07-20 13:28:54,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:54,069 INFO L479 AbstractCegarLoop]: Abstraction has 241 states and 674 transitions. [2020-07-20 13:28:54,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:28:54,069 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 674 transitions. [2020-07-20 13:28:54,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1227 [2020-07-20 13:28:54,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:54,087 INFO L422 BasicCegarLoop]: trace histogram [92, 92, 87, 87, 73, 72, 46, 46, 46, 46, 46, 46, 46, 43, 43, 43, 43, 43, 43, 43, 30, 26, 19, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:54,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:54,289 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:54,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:54,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1909877808, now seen corresponding path program 23 times [2020-07-20 13:28:54,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:54,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226182203] [2020-07-20 13:28:54,291 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:55,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:55,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:55,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 2218 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:28:55,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:56,837 INFO L134 CoverageAnalysis]: Checked inductivity of 44644 backedges. 1086 proven. 2717 refuted. 0 times theorem prover too weak. 40841 trivial. 0 not checked. [2020-07-20 13:28:56,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:07,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:13,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:14,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:14,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:16,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:18,821 INFO L134 CoverageAnalysis]: Checked inductivity of 44644 backedges. 1090 proven. 2746 refuted. 0 times theorem prover too weak. 40808 trivial. 0 not checked. [2020-07-20 13:29:18,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226182203] [2020-07-20 13:29:18,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:29:18,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:29:18,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988279390] [2020-07-20 13:29:18,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:29:18,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:29:18,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:29:18,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:29:18,824 INFO L87 Difference]: Start difference. First operand 241 states and 674 transitions. Second operand 21 states. [2020-07-20 13:29:19,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:29:19,920 INFO L93 Difference]: Finished difference Result 361 states and 1314 transitions. [2020-07-20 13:29:19,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:29:19,923 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1226 [2020-07-20 13:29:19,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:29:19,932 INFO L225 Difference]: With dead ends: 361 [2020-07-20 13:29:19,933 INFO L226 Difference]: Without dead ends: 352 [2020-07-20 13:29:19,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2459 GetRequests, 2415 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:29:19,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-20 13:29:19,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 285. [2020-07-20 13:29:19,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 285 states. [2020-07-20 13:29:19,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 912 transitions. [2020-07-20 13:29:19,982 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 912 transitions. Word has length 1226 [2020-07-20 13:29:19,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:29:19,985 INFO L479 AbstractCegarLoop]: Abstraction has 285 states and 912 transitions. [2020-07-20 13:29:19,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:29:19,985 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 912 transitions. [2020-07-20 13:29:20,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2271 [2020-07-20 13:29:20,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:29:20,038 INFO L422 BasicCegarLoop]: trace histogram [174, 174, 165, 165, 118, 111, 87, 87, 87, 87, 87, 87, 87, 82, 82, 82, 82, 82, 82, 82, 56, 54, 36, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:29:20,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:20,253 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:29:20,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:29:20,254 INFO L82 PathProgramCache]: Analyzing trace with hash 1481456144, now seen corresponding path program 24 times [2020-07-20 13:29:20,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:29:20,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466898896] [2020-07-20 13:29:20,255 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:21,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:29:21,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:21,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 4111 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:29:21,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:25,054 INFO L134 CoverageAnalysis]: Checked inductivity of 155580 backedges. 1325 proven. 5747 refuted. 0 times theorem prover too weak. 148508 trivial. 0 not checked. [2020-07-20 13:29:25,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:31,682 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:29:31,785 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:29:31,897 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:29:32,007 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:29:32,115 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:29:48,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:48,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:55,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:55,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:59,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:59,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:59,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:59,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:00,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:00,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:00,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:00,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:00,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:00,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:01,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:02,176 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:30:05,074 INFO L134 CoverageAnalysis]: Checked inductivity of 155580 backedges. 1329 proven. 5773 refuted. 0 times theorem prover too weak. 148478 trivial. 0 not checked. [2020-07-20 13:30:05,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466898896] [2020-07-20 13:30:05,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:30:05,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:30:05,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345480523] [2020-07-20 13:30:05,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:30:05,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:30:05,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:30:05,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:30:05,079 INFO L87 Difference]: Start difference. First operand 285 states and 912 transitions. Second operand 21 states. [2020-07-20 13:30:06,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:30:06,120 INFO L93 Difference]: Finished difference Result 382 states and 1372 transitions. [2020-07-20 13:30:06,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:30:06,125 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 2270 [2020-07-20 13:30:06,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:30:06,135 INFO L225 Difference]: With dead ends: 382 [2020-07-20 13:30:06,135 INFO L226 Difference]: Without dead ends: 362 [2020-07-20 13:30:06,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4547 GetRequests, 4503 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:30:06,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-07-20 13:30:06,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 274. [2020-07-20 13:30:06,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-20 13:30:06,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 833 transitions. [2020-07-20 13:30:06,178 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 833 transitions. Word has length 2270 [2020-07-20 13:30:06,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:30:06,178 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 833 transitions. [2020-07-20 13:30:06,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:30:06,178 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 833 transitions. [2020-07-20 13:30:06,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1636 [2020-07-20 13:30:06,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:30:06,199 INFO L422 BasicCegarLoop]: trace histogram [124, 124, 117, 117, 94, 88, 62, 62, 62, 62, 62, 62, 62, 58, 58, 58, 58, 58, 58, 58, 36, 30, 29, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:30:06,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:06,400 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:30:06,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:30:06,401 INFO L82 PathProgramCache]: Analyzing trace with hash -116213763, now seen corresponding path program 25 times [2020-07-20 13:30:06,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:30:06,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093611189] [2020-07-20 13:30:06,402 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:07,935 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:30:07,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:30:07,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 2956 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:30:07,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:30:09,281 INFO L134 CoverageAnalysis]: Checked inductivity of 80023 backedges. 1223 proven. 4532 refuted. 0 times theorem prover too weak. 74268 trivial. 0 not checked. [2020-07-20 13:30:09,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:30:13,890 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:25,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:31,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:31,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:35,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:35,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:36,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:36,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:36,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:36,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:38,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:38,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:40,663 INFO L134 CoverageAnalysis]: Checked inductivity of 80023 backedges. 1229 proven. 4570 refuted. 0 times theorem prover too weak. 74224 trivial. 0 not checked. [2020-07-20 13:30:40,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093611189] [2020-07-20 13:30:40,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:30:40,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:30:40,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317347141] [2020-07-20 13:30:40,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:30:40,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:30:40,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:30:40,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:30:40,666 INFO L87 Difference]: Start difference. First operand 274 states and 833 transitions. Second operand 23 states. [2020-07-20 13:30:42,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:30:42,013 INFO L93 Difference]: Finished difference Result 404 states and 1401 transitions. [2020-07-20 13:30:42,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:30:42,018 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1635 [2020-07-20 13:30:42,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:30:42,026 INFO L225 Difference]: With dead ends: 404 [2020-07-20 13:30:42,026 INFO L226 Difference]: Without dead ends: 352 [2020-07-20 13:30:42,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3278 GetRequests, 3229 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:30:42,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-20 13:30:42,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 301. [2020-07-20 13:30:42,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 301 states. [2020-07-20 13:30:42,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 1028 transitions. [2020-07-20 13:30:42,059 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 1028 transitions. Word has length 1635 [2020-07-20 13:30:42,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:30:42,060 INFO L479 AbstractCegarLoop]: Abstraction has 301 states and 1028 transitions. [2020-07-20 13:30:42,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:30:42,060 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 1028 transitions. [2020-07-20 13:30:42,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1537 [2020-07-20 13:30:42,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:30:42,080 INFO L422 BasicCegarLoop]: trace histogram [117, 117, 110, 110, 86, 81, 58, 58, 58, 58, 58, 58, 58, 55, 55, 55, 55, 55, 55, 55, 36, 28, 26, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:30:42,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:42,283 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:30:42,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:30:42,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1236185890, now seen corresponding path program 26 times [2020-07-20 13:30:42,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:30:42,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [855281955] [2020-07-20 13:30:42,285 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:43,864 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:30:43,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:30:43,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 2777 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:30:43,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:30:45,069 INFO L134 CoverageAnalysis]: Checked inductivity of 70571 backedges. 975 proven. 3735 refuted. 0 times theorem prover too weak. 65861 trivial. 0 not checked. [2020-07-20 13:30:45,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:31:01,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:01,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:05,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:09,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:09,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:10,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:10,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:10,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:10,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:11,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:11,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:11,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:13,734 INFO L134 CoverageAnalysis]: Checked inductivity of 70571 backedges. 975 proven. 3767 refuted. 0 times theorem prover too weak. 65829 trivial. 0 not checked. [2020-07-20 13:31:13,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [855281955] [2020-07-20 13:31:13,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:31:13,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:31:13,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163808415] [2020-07-20 13:31:13,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:31:13,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:31:13,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:31:13,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:31:13,736 INFO L87 Difference]: Start difference. First operand 301 states and 1028 transitions. Second operand 21 states. [2020-07-20 13:31:14,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:31:14,916 INFO L93 Difference]: Finished difference Result 442 states and 1891 transitions. [2020-07-20 13:31:14,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:31:14,921 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1536 [2020-07-20 13:31:14,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:31:14,932 INFO L225 Difference]: With dead ends: 442 [2020-07-20 13:31:14,932 INFO L226 Difference]: Without dead ends: 425 [2020-07-20 13:31:14,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3079 GetRequests, 3035 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:31:14,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2020-07-20 13:31:14,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 290. [2020-07-20 13:31:14,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-20 13:31:14,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 969 transitions. [2020-07-20 13:31:14,980 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 969 transitions. Word has length 1536 [2020-07-20 13:31:14,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:31:14,981 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 969 transitions. [2020-07-20 13:31:14,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:31:14,981 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 969 transitions. [2020-07-20 13:31:14,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1076 [2020-07-20 13:31:14,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:31:14,996 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 77, 77, 64, 62, 40, 40, 40, 40, 40, 40, 40, 38, 38, 38, 38, 38, 38, 38, 26, 22, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:31:15,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:15,211 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:31:15,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:31:15,212 INFO L82 PathProgramCache]: Analyzing trace with hash -87232605, now seen corresponding path program 27 times [2020-07-20 13:31:15,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:31:15,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170433024] [2020-07-20 13:31:15,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:16,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:31:16,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:31:16,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 1944 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:31:16,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:31:17,500 INFO L134 CoverageAnalysis]: Checked inductivity of 34183 backedges. 1468 proven. 2649 refuted. 0 times theorem prover too weak. 30066 trivial. 0 not checked. [2020-07-20 13:31:17,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:31:20,723 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:31:20,831 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:31:20,945 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:31:21,055 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:31:21,717 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:31:21,835 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:31:21,960 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:31:22,087 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:31:22,211 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:31:22,326 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:31:22,432 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:31:28,356 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:31:29,055 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:31:29,164 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:31:29,277 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:31:29,390 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:31:29,498 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:31:30,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:35,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:37,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:37,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:40,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:41,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:41,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:42,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:42,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:42,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:42,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:43,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:43,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:43,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:44,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:47,151 INFO L134 CoverageAnalysis]: Checked inductivity of 34183 backedges. 1470 proven. 2703 refuted. 0 times theorem prover too weak. 30010 trivial. 0 not checked. [2020-07-20 13:31:47,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170433024] [2020-07-20 13:31:47,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:31:47,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:31:47,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605785820] [2020-07-20 13:31:47,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:31:47,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:31:47,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:31:47,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:31:47,154 INFO L87 Difference]: Start difference. First operand 290 states and 969 transitions. Second operand 25 states. [2020-07-20 13:31:49,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:31:49,247 INFO L93 Difference]: Finished difference Result 382 states and 1324 transitions. [2020-07-20 13:31:49,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:31:49,253 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1075 [2020-07-20 13:31:49,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:31:49,260 INFO L225 Difference]: With dead ends: 382 [2020-07-20 13:31:49,260 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 13:31:49,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2159 GetRequests, 2105 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:31:49,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 13:31:49,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 348. [2020-07-20 13:31:49,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 13:31:49,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 1171 transitions. [2020-07-20 13:31:49,314 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 1171 transitions. Word has length 1075 [2020-07-20 13:31:49,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:31:49,315 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 1171 transitions. [2020-07-20 13:31:49,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:31:49,315 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 1171 transitions. [2020-07-20 13:31:49,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1473 [2020-07-20 13:31:49,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:31:49,333 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 98, 98, 77, 74, 60, 60, 60, 60, 60, 60, 60, 49, 49, 49, 49, 49, 49, 49, 47, 25, 21, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:31:49,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:49,534 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:31:49,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:31:49,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1638236506, now seen corresponding path program 28 times [2020-07-20 13:31:49,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:31:49,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016868424] [2020-07-20 13:31:49,537 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:51,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:31:51,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:31:51,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 2664 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:31:51,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:31:52,146 INFO L134 CoverageAnalysis]: Checked inductivity of 65463 backedges. 1385 proven. 3739 refuted. 0 times theorem prover too weak. 60339 trivial. 0 not checked. [2020-07-20 13:31:52,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:31:55,759 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:31:55,964 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:31:56,071 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:31:57,885 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:31:57,999 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:31:58,119 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:31:58,239 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:31:58,355 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:31:58,463 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:32:13,487 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:32:13,597 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:32:13,707 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:32:13,818 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 13:32:14,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:21,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:21,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:23,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:25,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:26,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:27,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:27,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:27,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:27,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:27,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:28,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:32,827 INFO L134 CoverageAnalysis]: Checked inductivity of 65463 backedges. 1389 proven. 3775 refuted. 0 times theorem prover too weak. 60299 trivial. 0 not checked. [2020-07-20 13:32:32,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016868424] [2020-07-20 13:32:32,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:32:32,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:32:32,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224490677] [2020-07-20 13:32:32,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:32:32,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:32:32,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:32:32,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:32:32,831 INFO L87 Difference]: Start difference. First operand 348 states and 1171 transitions. Second operand 23 states. [2020-07-20 13:32:34,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:32:34,480 INFO L93 Difference]: Finished difference Result 465 states and 1783 transitions. [2020-07-20 13:32:34,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:32:34,486 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1472 [2020-07-20 13:32:34,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:32:34,497 INFO L225 Difference]: With dead ends: 465 [2020-07-20 13:32:34,497 INFO L226 Difference]: Without dead ends: 456 [2020-07-20 13:32:34,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2952 GetRequests, 2903 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:32:34,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2020-07-20 13:32:34,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 333. [2020-07-20 13:32:34,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2020-07-20 13:32:34,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 1037 transitions. [2020-07-20 13:32:34,548 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 1037 transitions. Word has length 1472 [2020-07-20 13:32:34,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:32:34,549 INFO L479 AbstractCegarLoop]: Abstraction has 333 states and 1037 transitions. [2020-07-20 13:32:34,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:32:34,549 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 1037 transitions. [2020-07-20 13:32:34,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1235 [2020-07-20 13:32:34,569 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:32:34,570 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 88, 88, 73, 68, 46, 46, 46, 46, 46, 46, 46, 44, 44, 44, 44, 44, 44, 44, 27, 25, 24, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:32:34,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:32:34,771 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:32:34,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:32:34,772 INFO L82 PathProgramCache]: Analyzing trace with hash 180336521, now seen corresponding path program 29 times [2020-07-20 13:32:34,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:32:34,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557647215] [2020-07-20 13:32:34,773 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:32:36,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:32:36,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:32:36,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 2233 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:32:36,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:32:37,060 INFO L134 CoverageAnalysis]: Checked inductivity of 45254 backedges. 843 proven. 2437 refuted. 0 times theorem prover too weak. 41974 trivial. 0 not checked. [2020-07-20 13:32:37,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:32:41,868 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 13:32:51,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:01,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:01,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:05,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:05,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:06,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:06,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:06,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:06,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:07,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:07,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:07,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:08,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:11,004 INFO L134 CoverageAnalysis]: Checked inductivity of 45254 backedges. 843 proven. 2460 refuted. 0 times theorem prover too weak. 41951 trivial. 0 not checked. [2020-07-20 13:33:11,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557647215] [2020-07-20 13:33:11,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:33:11,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:33:11,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664735582] [2020-07-20 13:33:11,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:33:11,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:33:11,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:33:11,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:33:11,006 INFO L87 Difference]: Start difference. First operand 333 states and 1037 transitions. Second operand 19 states. [2020-07-20 13:33:12,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:33:12,681 INFO L93 Difference]: Finished difference Result 555 states and 2305 transitions. [2020-07-20 13:33:12,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:33:12,691 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1234 [2020-07-20 13:33:12,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:33:12,704 INFO L225 Difference]: With dead ends: 555 [2020-07-20 13:33:12,704 INFO L226 Difference]: Without dead ends: 537 [2020-07-20 13:33:12,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2474 GetRequests, 2435 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:33:12,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2020-07-20 13:33:12,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 324. [2020-07-20 13:33:12,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2020-07-20 13:33:12,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 976 transitions. [2020-07-20 13:33:12,763 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 976 transitions. Word has length 1234 [2020-07-20 13:33:12,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:33:12,763 INFO L479 AbstractCegarLoop]: Abstraction has 324 states and 976 transitions. [2020-07-20 13:33:12,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:33:12,764 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 976 transitions. [2020-07-20 13:33:12,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1239 [2020-07-20 13:33:12,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:33:12,787 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 90, 90, 73, 72, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 28, 27, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:33:13,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:33:13,001 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:33:13,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:33:13,003 INFO L82 PathProgramCache]: Analyzing trace with hash -305712469, now seen corresponding path program 30 times [2020-07-20 13:33:13,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:33:13,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439536703] [2020-07-20 13:33:13,004 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:33:14,486 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:33:14,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:33:14,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 2240 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:33:14,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:33:15,449 INFO L134 CoverageAnalysis]: Checked inductivity of 45504 backedges. 1154 proven. 2614 refuted. 0 times theorem prover too weak. 41736 trivial. 0 not checked. [2020-07-20 13:33:15,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:33:18,500 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:20,288 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:20,396 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:20,518 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:33:20,635 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:33:21,744 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:33:21,869 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:33:22,004 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:22,136 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:22,264 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:33:22,383 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:33:22,493 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:33:30,155 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:33:30,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:30,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:42,775 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:42,880 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:43,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:45,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:45,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:47,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:48,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:48,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:48,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:49,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:49,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:50,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:54,296 INFO L134 CoverageAnalysis]: Checked inductivity of 45504 backedges. 1156 proven. 2644 refuted. 0 times theorem prover too weak. 41704 trivial. 0 not checked. [2020-07-20 13:33:54,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439536703] [2020-07-20 13:33:54,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:33:54,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:33:54,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538691274] [2020-07-20 13:33:54,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:33:54,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:33:54,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:33:54,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:33:54,298 INFO L87 Difference]: Start difference. First operand 324 states and 976 transitions. Second operand 21 states. [2020-07-20 13:33:55,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:33:55,614 INFO L93 Difference]: Finished difference Result 520 states and 2089 transitions. [2020-07-20 13:33:55,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:33:55,621 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1238 [2020-07-20 13:33:55,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:33:55,634 INFO L225 Difference]: With dead ends: 520 [2020-07-20 13:33:55,634 INFO L226 Difference]: Without dead ends: 511 [2020-07-20 13:33:55,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2483 GetRequests, 2439 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:33:55,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2020-07-20 13:33:55,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 319. [2020-07-20 13:33:55,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2020-07-20 13:33:55,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 931 transitions. [2020-07-20 13:33:55,691 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 931 transitions. Word has length 1238 [2020-07-20 13:33:55,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:33:55,692 INFO L479 AbstractCegarLoop]: Abstraction has 319 states and 931 transitions. [2020-07-20 13:33:55,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:33:55,693 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 931 transitions. [2020-07-20 13:33:55,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1105 [2020-07-20 13:33:55,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:33:55,706 INFO L422 BasicCegarLoop]: trace histogram [83, 83, 78, 78, 66, 65, 41, 41, 41, 41, 41, 41, 41, 39, 39, 39, 39, 39, 39, 39, 26, 25, 18, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:33:55,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:33:55,914 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:33:55,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:33:55,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1604059719, now seen corresponding path program 31 times [2020-07-20 13:33:55,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:33:55,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883401563] [2020-07-20 13:33:55,916 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:33:57,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:33:57,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:33:57,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 1995 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:33:57,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:33:58,155 INFO L134 CoverageAnalysis]: Checked inductivity of 36093 backedges. 976 proven. 2004 refuted. 0 times theorem prover too weak. 33113 trivial. 0 not checked. [2020-07-20 13:33:58,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:02,820 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 13:34:02,924 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 13:34:11,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:11,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:19,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:20,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:20,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:21,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:22,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:22,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:22,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:23,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:27,268 INFO L134 CoverageAnalysis]: Checked inductivity of 36093 backedges. 978 proven. 2026 refuted. 0 times theorem prover too weak. 33089 trivial. 0 not checked. [2020-07-20 13:34:27,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883401563] [2020-07-20 13:34:27,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:27,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:34:27,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764751152] [2020-07-20 13:34:27,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:34:27,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:27,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:34:27,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:34:27,270 INFO L87 Difference]: Start difference. First operand 319 states and 931 transitions. Second operand 19 states. [2020-07-20 13:34:28,341 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2020-07-20 13:34:28,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:28,711 INFO L93 Difference]: Finished difference Result 616 states and 2823 transitions. [2020-07-20 13:34:28,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:34:28,718 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1104 [2020-07-20 13:34:28,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:28,735 INFO L225 Difference]: With dead ends: 616 [2020-07-20 13:34:28,735 INFO L226 Difference]: Without dead ends: 607 [2020-07-20 13:34:28,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2214 GetRequests, 2175 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:34:28,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-20 13:34:28,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 321. [2020-07-20 13:34:28,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 321 states. [2020-07-20 13:34:28,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 951 transitions. [2020-07-20 13:34:28,806 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 951 transitions. Word has length 1104 [2020-07-20 13:34:28,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:28,806 INFO L479 AbstractCegarLoop]: Abstraction has 321 states and 951 transitions. [2020-07-20 13:34:28,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:34:28,807 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 951 transitions. [2020-07-20 13:34:28,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1018 [2020-07-20 13:34:28,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:28,818 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 73, 73, 60, 56, 38, 38, 38, 38, 38, 38, 38, 36, 36, 36, 36, 36, 36, 36, 24, 18, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:29,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:29,019 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:29,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:29,021 INFO L82 PathProgramCache]: Analyzing trace with hash -210052551, now seen corresponding path program 32 times [2020-07-20 13:34:29,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:29,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986287251] [2020-07-20 13:34:29,022 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:30,501 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:30,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:30,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 1843 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:34:30,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:31,237 INFO L134 CoverageAnalysis]: Checked inductivity of 30554 backedges. 1268 proven. 2219 refuted. 0 times theorem prover too weak. 27067 trivial. 0 not checked. [2020-07-20 13:34:31,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:34,216 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:34:34,321 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:34:34,971 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:34:35,085 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:34:35,205 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:34:35,326 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:34:36,520 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:34:36,640 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:34:36,750 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:34:45,260 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:34:45,366 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:34:45,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:45,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts