/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 2 -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 [2020-07-21 13:10:41,301 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:10:41,305 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:10:41,325 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:10:41,325 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:10:41,327 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:10:41,329 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:10:41,340 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:10:41,345 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:10:41,349 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:10:41,350 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:10:41,351 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:10:41,352 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:10:41,353 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:10:41,355 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:10:41,357 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:10:41,359 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:10:41,359 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:10:41,361 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:10:41,365 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:10:41,371 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:10:41,376 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:10:41,377 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:10:41,378 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:10:41,380 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:10:41,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:10:41,391 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:10:41,393 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:10:41,393 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 13:10:41,431 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:10:41,431 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:10:41,436 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:10:41,436 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:10:41,437 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:10:41,437 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:10:41,437 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:10:41,437 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:10:41,437 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:10:41,438 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:10:41,438 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:10:41,438 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:10:41,438 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:10:41,442 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:10:41,442 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:10:41,442 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:10:41,442 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:10:41,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:10:41,443 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:10:41,444 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:10:41,444 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:10:41,445 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:10:41,445 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:10:41,445 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:10:41,445 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:10:41,445 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:10:41,446 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:41,446 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:10:41,446 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:10:41,446 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 -> 2 [2020-07-21 13:10:41,775 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:10:41,797 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:10:41,802 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:10:41,804 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:10:41,804 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:10:41,806 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-21 13:10:41,894 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93c764b2c/fd317be9f1e04813ae1552a9c98db806/FLAG4b5af1690 [2020-07-21 13:10:42,382 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:10:42,384 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-21 13:10:42,392 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93c764b2c/fd317be9f1e04813ae1552a9c98db806/FLAG4b5af1690 [2020-07-21 13:10:42,770 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93c764b2c/fd317be9f1e04813ae1552a9c98db806 [2020-07-21 13:10:42,782 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:10:42,786 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:10:42,787 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:10:42,788 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:10:42,792 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:10:42,793 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:10:42" (1/1) ... [2020-07-21 13:10:42,797 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c2043f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:42, skipping insertion in model container [2020-07-21 13:10:42,797 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:10:42" (1/1) ... [2020-07-21 13:10:42,807 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:10:42,829 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:10:43,010 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:10:43,016 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:10:43,036 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:10:43,052 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:10:43,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43 WrapperNode [2020-07-21 13:10:43,053 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:10:43,054 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:10:43,054 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:10:43,054 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:10:43,067 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... [2020-07-21 13:10:43,068 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... [2020-07-21 13:10:43,074 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... [2020-07-21 13:10:43,074 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... [2020-07-21 13:10:43,173 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... [2020-07-21 13:10:43,175 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... [2020-07-21 13:10:43,176 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... [2020-07-21 13:10:43,178 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:10:43,179 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:10:43,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:10:43,179 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:10:43,180 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:10:43,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:10:43,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:10:43,259 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 13:10:43,259 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 13:10:43,259 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:10:43,260 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:10:43,260 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:10:43,260 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 13:10:43,260 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 13:10:43,260 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:10:43,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:10:43,261 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:10:43,476 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:10:43,476 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:10:43,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:10:43 BoogieIcfgContainer [2020-07-21 13:10:43,482 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:10:43,484 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:10:43,484 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:10:43,490 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:10:43,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:10:42" (1/3) ... [2020-07-21 13:10:43,491 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29cc63de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:10:43, skipping insertion in model container [2020-07-21 13:10:43,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:43" (2/3) ... [2020-07-21 13:10:43,492 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29cc63de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:10:43, skipping insertion in model container [2020-07-21 13:10:43,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:10:43" (3/3) ... [2020-07-21 13:10:43,495 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-1.c [2020-07-21 13:10:43,509 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:10:43,519 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:10:43,538 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:10:43,591 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:10:43,592 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:10:43,592 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:10:43,592 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:10:43,593 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:10:43,593 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:10:43,593 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:10:43,593 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:10:43,626 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 13:10:43,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:10:43,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:43,638 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:43,639 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:43,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:43,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 13:10:43,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:43,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [846829990] [2020-07-21 13:10:43,674 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:43,759 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:43,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:43,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:10:43,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:43,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:10:43,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:10:43,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [846829990] [2020-07-21 13:10:43,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:10:43,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:10:43,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502089360] [2020-07-21 13:10:43,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:10:43,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:43,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:10:43,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:10:43,897 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 13:10:44,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:44,027 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 13:10:44,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:10:44,031 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:10:44,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:44,043 INFO L225 Difference]: With dead ends: 44 [2020-07-21 13:10:44,044 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 13:10:44,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:10:44,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 13:10:44,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 13:10:44,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:10:44,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:10:44,102 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 13:10:44,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:44,103 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:10:44,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:10:44,103 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:10:44,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:10:44,105 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:44,105 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:44,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:44,310 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:44,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:44,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 13:10:44,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:44,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887899436] [2020-07-21 13:10:44,312 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:44,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:44,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:44,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:10:44,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:44,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:10:44,408 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:10:44,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887899436] [2020-07-21 13:10:44,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:10:44,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:10:44,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876299725] [2020-07-21 13:10:44,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:10:44,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:44,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:10:44,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:10:44,420 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 13:10:44,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:44,537 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 13:10:44,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:10:44,539 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:10:44,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:44,541 INFO L225 Difference]: With dead ends: 36 [2020-07-21 13:10:44,542 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 13:10:44,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:10:44,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 13:10:44,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 13:10:44,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:10:44,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:10:44,557 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 13:10:44,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:44,558 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:10:44,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:10:44,558 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:10:44,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:10:44,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:44,560 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:44,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:44,773 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:44,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:44,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 13:10:44,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:44,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428592382] [2020-07-21 13:10:44,775 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:44,809 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:44,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:44,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:10:44,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:44,888 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:44,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:45,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,201 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:45,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428592382] [2020-07-21 13:10:45,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:45,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:10:45,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578117170] [2020-07-21 13:10:45,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:10:45,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:45,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:10:45,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:10:45,215 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 13:10:45,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:45,386 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 13:10:45,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:10:45,388 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 13:10:45,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:45,391 INFO L225 Difference]: With dead ends: 41 [2020-07-21 13:10:45,392 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 13:10:45,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:45,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 13:10:45,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 13:10:45,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:10:45,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:10:45,419 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 13:10:45,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:45,420 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:10:45,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:10:45,421 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:10:45,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:10:45,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:45,425 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:45,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:45,639 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:45,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:45,640 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 13:10:45,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:45,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761779626] [2020-07-21 13:10:45,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:45,678 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:45,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:45,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:10:45,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:45,732 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:45,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:45,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,943 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:45,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761779626] [2020-07-21 13:10:45,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:45,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:10:45,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653578759] [2020-07-21 13:10:45,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:10:45,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:45,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:10:45,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:10:45,946 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 13:10:46,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:46,078 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 13:10:46,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:10:46,079 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 13:10:46,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:46,082 INFO L225 Difference]: With dead ends: 46 [2020-07-21 13:10:46,084 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 13:10:46,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:46,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 13:10:46,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 13:10:46,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:10:46,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:10:46,095 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 13:10:46,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:46,096 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:10:46,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:10:46,096 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:10:46,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:10:46,098 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:46,098 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:46,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:46,313 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:46,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:46,314 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 13:10:46,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:46,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1264432079] [2020-07-21 13:10:46,315 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:46,351 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:46,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:46,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:10:46,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:46,422 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:10:46,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:46,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,828 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:10:46,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1264432079] [2020-07-21 13:10:46,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:46,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:10:46,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085668168] [2020-07-21 13:10:46,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:10:46,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:46,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:10:46,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:46,831 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 13:10:47,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:47,037 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 13:10:47,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:10:47,037 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 13:10:47,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:47,039 INFO L225 Difference]: With dead ends: 51 [2020-07-21 13:10:47,039 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 13:10:47,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:10:47,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 13:10:47,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 13:10:47,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:10:47,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:10:47,051 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 13:10:47,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:47,052 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:10:47,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:10:47,052 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:10:47,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 13:10:47,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:47,056 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:47,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:47,260 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:47,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:47,261 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 13:10:47,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:47,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363346839] [2020-07-21 13:10:47,263 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:47,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:47,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:47,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:10:47,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:47,355 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 13:10:47,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:47,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:47,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:47,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:47,694 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:10:47,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363346839] [2020-07-21 13:10:47,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:47,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:10:47,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200347590] [2020-07-21 13:10:47,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:10:47,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:47,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:10:47,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:47,697 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 13:10:47,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:47,909 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 13:10:47,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:10:47,911 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 13:10:47,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:47,913 INFO L225 Difference]: With dead ends: 56 [2020-07-21 13:10:47,913 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 13:10:47,917 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 [2020-07-21 13:10:47,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 13:10:47,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 13:10:47,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:10:47,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:10:47,943 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 13:10:47,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:47,944 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:10:47,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:10:47,944 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:10:47,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 13:10:47,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:47,948 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] [2020-07-21 13:10:48,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:48,149 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:48,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:48,149 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 13:10:48,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:48,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558721032] [2020-07-21 13:10:48,150 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:48,201 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:48,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:48,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:10:48,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:48,261 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:10:48,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:48,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:48,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:48,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:48,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:48,785 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 13:10:48,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558721032] [2020-07-21 13:10:48,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:48,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:10:48,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953765546] [2020-07-21 13:10:48,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:10:48,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:48,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:10:48,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:10:48,788 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 13:10:49,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:49,028 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 13:10:49,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:10:49,029 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 13:10:49,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:49,035 INFO L225 Difference]: With dead ends: 61 [2020-07-21 13:10:49,035 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 13:10:49,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:10:49,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 13:10:49,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 13:10:49,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:10:49,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:10:49,066 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 13:10:49,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:49,067 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:10:49,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:10:49,067 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:10:49,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 13:10:49,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:49,074 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] [2020-07-21 13:10:49,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:49,292 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:49,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:49,293 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 13:10:49,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:49,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1178357058] [2020-07-21 13:10:49,294 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:49,336 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:49,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:49,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:10:49,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:49,417 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 13:10:49,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:49,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,973 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 13:10:49,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1178357058] [2020-07-21 13:10:49,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:49,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:10:49,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726814159] [2020-07-21 13:10:49,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:10:49,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:49,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:10:49,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:10:49,978 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 13:10:50,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:50,240 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 13:10:50,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:10:50,241 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 13:10:50,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:50,243 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:10:50,243 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 13:10:50,244 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 [2020-07-21 13:10:50,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 13:10:50,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 13:10:50,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:10:50,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:10:50,258 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 13:10:50,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:50,259 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:10:50,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:10:50,259 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:10:50,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 13:10:50,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:50,261 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] [2020-07-21 13:10:50,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:50,476 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:50,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:50,477 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 13:10:50,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:50,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625698153] [2020-07-21 13:10:50,478 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:50,534 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:50,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:50,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:10:50,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:50,630 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 13:10:50,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:51,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:51,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:51,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:51,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:51,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:51,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:51,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:51,598 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 13:10:51,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625698153] [2020-07-21 13:10:51,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:51,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 13:10:51,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489896598] [2020-07-21 13:10:51,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:10:51,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:51,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:10:51,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:10:51,602 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 13:10:51,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:51,855 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 13:10:51,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:10:51,856 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 13:10:51,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:51,857 INFO L225 Difference]: With dead ends: 71 [2020-07-21 13:10:51,858 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 13:10:51,859 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 [2020-07-21 13:10:51,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 13:10:51,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 13:10:51,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:10:51,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:10:51,873 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 13:10:51,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:51,874 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:10:51,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:10:51,874 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:10:51,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 13:10:51,879 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:51,879 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] [2020-07-21 13:10:52,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:52,094 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:52,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:52,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 13:10:52,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:52,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177894044] [2020-07-21 13:10:52,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:52,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:52,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:52,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:10:52,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:52,258 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 13:10:52,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:52,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:53,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:53,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:53,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:53,269 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 13:10:53,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177894044] [2020-07-21 13:10:53,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:53,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 13:10:53,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56560169] [2020-07-21 13:10:53,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:10:53,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:53,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:10:53,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:10:53,273 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-21 13:10:53,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:53,520 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 13:10:53,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:10:53,520 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-21 13:10:53,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:53,523 INFO L225 Difference]: With dead ends: 76 [2020-07-21 13:10:53,523 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 13:10:53,524 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 [2020-07-21 13:10:53,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 13:10:53,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 13:10:53,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:10:53,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:10:53,551 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 13:10:53,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:53,552 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:10:53,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:10:53,552 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:10:53,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 13:10:53,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:53,556 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] [2020-07-21 13:10:53,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:53,757 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:53,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:53,758 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 13:10:53,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:53,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186575725] [2020-07-21 13:10:53,759 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:53,877 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:53,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:53,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:10:53,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:53,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-21 13:10:53,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:55,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-21 13:10:55,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186575725] [2020-07-21 13:10:55,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:55,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 13:10:55,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658655201] [2020-07-21 13:10:55,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:10:55,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:55,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:10:55,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:10:55,724 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-21 13:10:56,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:56,013 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 13:10:56,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:10:56,014 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-21 13:10:56,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:56,020 INFO L225 Difference]: With dead ends: 81 [2020-07-21 13:10:56,021 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 13:10:56,022 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 [2020-07-21 13:10:56,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 13:10:56,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 13:10:56,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 13:10:56,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 13:10:56,053 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 13:10:56,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:56,054 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 13:10:56,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:10:56,055 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 13:10:56,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 13:10:56,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:56,060 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] [2020-07-21 13:10:56,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:56,278 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:56,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:56,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-21 13:10:56,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:56,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657320859] [2020-07-21 13:10:56,279 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:56,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:56,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:56,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:10:56,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:56,437 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-21 13:10:56,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:57,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,908 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-21 13:10:57,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657320859] [2020-07-21 13:10:57,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:57,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 13:10:57,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670821877] [2020-07-21 13:10:57,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:10:57,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:57,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:10:57,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:10:57,911 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-21 13:10:58,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:58,248 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-21 13:10:58,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:10:58,249 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-21 13:10:58,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:58,251 INFO L225 Difference]: With dead ends: 86 [2020-07-21 13:10:58,252 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 13:10:58,253 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 [2020-07-21 13:10:58,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 13:10:58,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-21 13:10:58,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 13:10:58,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 13:10:58,270 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-21 13:10:58,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:58,271 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 13:10:58,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:10:58,271 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 13:10:58,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-21 13:10:58,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:58,275 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] [2020-07-21 13:10:58,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:58,491 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:58,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:58,492 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-21 13:10:58,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:58,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242393479] [2020-07-21 13:10:58,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:58,624 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:58,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:58,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:10:58,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:58,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-21 13:10:58,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:00,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:01,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:01,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:01,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-21 13:11:01,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242393479] [2020-07-21 13:11:01,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:01,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 13:11:01,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302754380] [2020-07-21 13:11:01,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:11:01,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:01,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:11:01,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:11:01,100 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-21 13:11:01,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:01,518 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-21 13:11:01,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:11:01,518 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-21 13:11:01,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:01,522 INFO L225 Difference]: With dead ends: 91 [2020-07-21 13:11:01,522 INFO L226 Difference]: Without dead ends: 87 [2020-07-21 13:11:01,523 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 [2020-07-21 13:11:01,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-21 13:11:01,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-21 13:11:01,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:11:01,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 13:11:01,535 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-21 13:11:01,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:01,535 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 13:11:01,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:11:01,536 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 13:11:01,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 13:11:01,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:01,539 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] [2020-07-21 13:11:01,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:01,752 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:01,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:01,753 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-21 13:11:01,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:01,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058428977] [2020-07-21 13:11:01,754 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:01,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:01,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:01,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:11:01,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:02,015 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-21 13:11:02,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:03,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:04,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:04,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:04,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:04,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:04,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:04,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-21 13:11:04,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058428977] [2020-07-21 13:11:04,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:04,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 13:11:04,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42554776] [2020-07-21 13:11:04,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:11:04,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:04,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:11:04,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:11:04,511 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-21 13:11:04,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:04,899 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-21 13:11:04,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:11:04,900 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-21 13:11:04,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:04,902 INFO L225 Difference]: With dead ends: 96 [2020-07-21 13:11:04,903 INFO L226 Difference]: Without dead ends: 92 [2020-07-21 13:11:04,904 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 [2020-07-21 13:11:04,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-21 13:11:04,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-21 13:11:04,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:11:04,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 13:11:04,916 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-21 13:11:04,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:04,917 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 13:11:04,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:11:04,917 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 13:11:04,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 13:11:04,926 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:04,926 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] [2020-07-21 13:11:05,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:05,141 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:05,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:05,141 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-21 13:11:05,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:05,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [989233813] [2020-07-21 13:11:05,142 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:05,373 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:05,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:05,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 784 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:05,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:05,580 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-21 13:11:05,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:07,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-21 13:11:09,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [989233813] [2020-07-21 13:11:09,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:09,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 13:11:09,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853236549] [2020-07-21 13:11:09,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 13:11:09,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:09,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 13:11:09,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:11:09,428 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-21 13:11:09,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:09,898 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-21 13:11:09,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:11:09,899 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-21 13:11:09,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:09,903 INFO L225 Difference]: With dead ends: 101 [2020-07-21 13:11:09,903 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 13:11:09,906 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 [2020-07-21 13:11:09,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 13:11:09,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-21 13:11:09,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 13:11:09,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-21 13:11:09,924 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-21 13:11:09,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:09,925 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-21 13:11:09,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 13:11:09,925 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-21 13:11:09,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-21 13:11:09,929 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:09,929 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] [2020-07-21 13:11:10,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:10,144 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:10,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:10,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-21 13:11:10,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:10,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297568508] [2020-07-21 13:11:10,145 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:10,448 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:10,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:10,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:10,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:10,682 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-21 13:11:10,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:12,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:12,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:13,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:13,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:14,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:14,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:14,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:14,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:14,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:14,711 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-21 13:11:14,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297568508] [2020-07-21 13:11:14,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:14,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 13:11:14,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695794266] [2020-07-21 13:11:14,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 13:11:14,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:14,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 13:11:14,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:11:14,714 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-21 13:11:15,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:15,200 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-21 13:11:15,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:11:15,201 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-21 13:11:15,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:15,204 INFO L225 Difference]: With dead ends: 106 [2020-07-21 13:11:15,204 INFO L226 Difference]: Without dead ends: 102 [2020-07-21 13:11:15,206 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 [2020-07-21 13:11:15,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-21 13:11:15,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-21 13:11:15,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 13:11:15,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-21 13:11:15,220 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-21 13:11:15,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:15,223 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-21 13:11:15,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 13:11:15,224 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-21 13:11:15,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-21 13:11:15,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:15,233 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] [2020-07-21 13:11:15,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:15,448 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:15,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:15,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-21 13:11:15,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:15,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615239832] [2020-07-21 13:11:15,451 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:15,859 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:15,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:15,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:15,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:16,456 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-21 13:11:16,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:20,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:21,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:22,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:22,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:22,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:22,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:23,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:23,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:23,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:23,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:23,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:23,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:23,881 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-21 13:11:23,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615239832] [2020-07-21 13:11:23,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:23,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 13:11:23,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202103420] [2020-07-21 13:11:23,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 13:11:23,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:23,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 13:11:23,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:11:23,885 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-21 13:11:24,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:24,455 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-21 13:11:24,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:11:24,456 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-21 13:11:24,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:24,460 INFO L225 Difference]: With dead ends: 111 [2020-07-21 13:11:24,461 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 13:11:24,462 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 [2020-07-21 13:11:24,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 13:11:24,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-21 13:11:24,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:11:24,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-21 13:11:24,474 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-21 13:11:24,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:24,475 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-21 13:11:24,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 13:11:24,475 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-21 13:11:24,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-21 13:11:24,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:24,479 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] [2020-07-21 13:11:24,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:24,694 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:24,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:24,695 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-21 13:11:24,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:24,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244856983] [2020-07-21 13:11:24,696 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:25,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:25,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:25,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 930 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:25,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:25,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-21 13:11:25,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:27,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:28,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:28,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:29,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:29,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,644 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-21 13:11:30,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244856983] [2020-07-21 13:11:30,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:30,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:11:30,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576085802] [2020-07-21 13:11:30,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:11:30,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:30,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:11:30,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:11:30,647 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-21 13:11:31,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:31,277 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-21 13:11:31,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:11:31,280 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-21 13:11:31,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:31,283 INFO L225 Difference]: With dead ends: 116 [2020-07-21 13:11:31,283 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 13:11:31,284 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 [2020-07-21 13:11:31,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 13:11:31,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-21 13:11:31,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:11:31,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-21 13:11:31,297 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-21 13:11:31,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:31,298 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-21 13:11:31,299 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:11:31,299 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-21 13:11:31,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-21 13:11:31,305 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:31,306 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] [2020-07-21 13:11:31,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:31,522 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:31,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:31,523 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-21 13:11:31,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:31,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086800719] [2020-07-21 13:11:31,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:31,952 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:31,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:31,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 1509 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:11:31,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:32,360 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-21 13:11:32,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:36,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:36,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:38,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:39,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:39,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:40,877 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-21 13:11:40,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086800719] [2020-07-21 13:11:40,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:40,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:11:40,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865405580] [2020-07-21 13:11:40,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:11:40,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:40,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:11:40,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:11:40,881 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-21 13:11:41,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:41,506 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-21 13:11:41,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:11:41,508 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-21 13:11:41,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:41,512 INFO L225 Difference]: With dead ends: 121 [2020-07-21 13:11:41,512 INFO L226 Difference]: Without dead ends: 117 [2020-07-21 13:11:41,513 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 [2020-07-21 13:11:41,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-21 13:11:41,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-21 13:11:41,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 13:11:41,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-21 13:11:41,527 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-21 13:11:41,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:41,528 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-21 13:11:41,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:11:41,529 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-21 13:11:41,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-21 13:11:41,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:41,537 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] [2020-07-21 13:11:41,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:41,751 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:41,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:41,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-21 13:11:41,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:41,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775412530] [2020-07-21 13:11:41,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:42,227 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:42,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:42,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 1677 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:42,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:42,611 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-21 13:11:42,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:45,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:45,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:48,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:48,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:48,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:49,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:49,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:49,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:49,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:49,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:49,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:49,885 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-21 13:11:49,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775412530] [2020-07-21 13:11:49,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:49,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:11:49,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013940736] [2020-07-21 13:11:49,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:11:49,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:49,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:11:49,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:11:49,888 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-21 13:11:50,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:50,522 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-21 13:11:50,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:11:50,524 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-21 13:11:50,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:50,529 INFO L225 Difference]: With dead ends: 159 [2020-07-21 13:11:50,529 INFO L226 Difference]: Without dead ends: 155 [2020-07-21 13:11:50,530 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 [2020-07-21 13:11:50,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-21 13:11:50,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-21 13:11:50,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-21 13:11:50,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-21 13:11:50,548 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-21 13:11:50,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:50,549 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-21 13:11:50,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:11:50,549 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-21 13:11:50,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-21 13:11:50,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:50,556 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] [2020-07-21 13:11:50,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:50,770 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:50,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:50,770 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-21 13:11:50,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:50,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233645619] [2020-07-21 13:11:50,771 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:51,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:51,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:51,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 1699 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:51,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:51,770 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-21 13:11:51,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:54,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:54,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:55,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:57,919 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-21 13:11:57,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233645619] [2020-07-21 13:11:57,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:57,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:11:57,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569899665] [2020-07-21 13:11:57,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:11:57,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:57,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:11:57,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:11:57,921 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-21 13:11:58,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:58,436 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-21 13:11:58,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:11:58,437 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-21 13:11:58,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:58,442 INFO L225 Difference]: With dead ends: 179 [2020-07-21 13:11:58,442 INFO L226 Difference]: Without dead ends: 175 [2020-07-21 13:11:58,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:11:58,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-21 13:11:58,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-21 13:11:58,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 13:11:58,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-21 13:11:58,464 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-21 13:11:58,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:58,465 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-21 13:11:58,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:11:58,466 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-21 13:11:58,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-21 13:11:58,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:58,477 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] [2020-07-21 13:11:58,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:58,691 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:58,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:58,692 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-21 13:11:58,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:58,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112909654] [2020-07-21 13:11:58,692 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:59,297 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:59,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:59,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 2399 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:59,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:00,016 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-21 13:12:00,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:04,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:06,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:06,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:07,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:07,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:09,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:09,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:09,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:09,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:09,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:09,629 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-21 13:12:09,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112909654] [2020-07-21 13:12:09,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:09,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:12:09,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833859728] [2020-07-21 13:12:09,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:12:09,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:09,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:12:09,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:12:09,632 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-21 13:12:10,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:10,294 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-21 13:12:10,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:12:10,297 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-21 13:12:10,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:10,302 INFO L225 Difference]: With dead ends: 156 [2020-07-21 13:12:10,302 INFO L226 Difference]: Without dead ends: 152 [2020-07-21 13:12:10,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:12:10,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-21 13:12:10,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-21 13:12:10,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-21 13:12:10,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-21 13:12:10,320 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-21 13:12:10,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:10,321 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-21 13:12:10,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:12:10,322 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-21 13:12:10,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-21 13:12:10,330 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:10,331 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] [2020-07-21 13:12:10,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:10,544 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:10,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:10,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-21 13:12:10,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:10,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250972807] [2020-07-21 13:12:10,546 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:11,183 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:11,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:11,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 2177 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:12:11,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:12,343 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-21 13:12:12,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:16,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:16,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:17,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:17,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:18,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:18,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:19,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:20,110 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-21 13:12:20,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250972807] [2020-07-21 13:12:20,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:20,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:12:20,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900018109] [2020-07-21 13:12:20,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:12:20,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:20,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:12:20,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:12:20,113 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-21 13:12:20,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:20,685 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-21 13:12:20,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:12:20,686 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-21 13:12:20,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:20,690 INFO L225 Difference]: With dead ends: 174 [2020-07-21 13:12:20,690 INFO L226 Difference]: Without dead ends: 170 [2020-07-21 13:12:20,691 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 [2020-07-21 13:12:20,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-21 13:12:20,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-21 13:12:20,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 13:12:20,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-21 13:12:20,713 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-21 13:12:20,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:20,714 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-21 13:12:20,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:12:20,714 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-21 13:12:20,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 13:12:20,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:20,727 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] [2020-07-21 13:12:20,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:20,942 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:20,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:20,943 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-21 13:12:20,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:20,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449546443] [2020-07-21 13:12:20,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:21,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:21,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:21,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 2521 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:12:21,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:22,336 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3594 refuted. 0 times theorem prover too weak. 33876 trivial. 0 not checked. [2020-07-21 13:12:22,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:27,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:29,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:31,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:32,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:33,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:33,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:33,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:34,998 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-21 13:12:34,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449546443] [2020-07-21 13:12:34,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:34,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:12:34,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080205441] [2020-07-21 13:12:35,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:12:35,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:35,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:12:35,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:12:35,001 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-21 13:12:36,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:36,161 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-21 13:12:36,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:12:36,163 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-21 13:12:36,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:36,169 INFO L225 Difference]: With dead ends: 263 [2020-07-21 13:12:36,170 INFO L226 Difference]: Without dead ends: 142 [2020-07-21 13:12:36,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:12:36,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-21 13:12:36,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-21 13:12:36,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 13:12:36,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-21 13:12:36,202 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-21 13:12:36,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:36,203 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-21 13:12:36,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:12:36,203 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-21 13:12:36,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2020-07-21 13:12:36,217 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:36,217 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] [2020-07-21 13:12:36,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:36,433 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:36,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:36,434 INFO L82 PathProgramCache]: Analyzing trace with hash -472403876, now seen corresponding path program 4 times [2020-07-21 13:12:36,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:36,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214873243] [2020-07-21 13:12:36,436 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:37,220 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:37,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:37,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 2211 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:12:37,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:37,803 INFO L134 CoverageAnalysis]: Checked inductivity of 29354 backedges. 636 proven. 2738 refuted. 0 times theorem prover too weak. 25980 trivial. 0 not checked. [2020-07-21 13:12:37,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:42,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:44,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:44,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:45,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:45,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:46,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:46,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:47,972 INFO L134 CoverageAnalysis]: Checked inductivity of 29354 backedges. 638 proven. 2776 refuted. 0 times theorem prover too weak. 25940 trivial. 0 not checked. [2020-07-21 13:12:47,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214873243] [2020-07-21 13:12:47,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:47,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:12:47,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646522968] [2020-07-21 13:12:47,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:12:47,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:47,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:12:47,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:12:47,974 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 23 states. [2020-07-21 13:12:48,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:48,665 INFO L93 Difference]: Finished difference Result 253 states and 882 transitions. [2020-07-21 13:12:48,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:12:48,667 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 994 [2020-07-21 13:12:48,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:48,675 INFO L225 Difference]: With dead ends: 253 [2020-07-21 13:12:48,675 INFO L226 Difference]: Without dead ends: 239 [2020-07-21 13:12:48,679 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 [2020-07-21 13:12:48,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2020-07-21 13:12:48,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 140. [2020-07-21 13:12:48,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 13:12:48,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 319 transitions. [2020-07-21 13:12:48,726 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 319 transitions. Word has length 994 [2020-07-21 13:12:48,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:48,727 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 319 transitions. [2020-07-21 13:12:48,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:12:48,727 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 319 transitions. [2020-07-21 13:12:48,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1358 [2020-07-21 13:12:48,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:48,761 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] [2020-07-21 13:12:48,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:48,975 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:48,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:48,976 INFO L82 PathProgramCache]: Analyzing trace with hash 190267374, now seen corresponding path program 5 times [2020-07-21 13:12:48,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:48,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429291343] [2020-07-21 13:12:48,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:49,878 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:49,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:49,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 3015 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:12:49,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:50,685 INFO L134 CoverageAnalysis]: Checked inductivity of 55191 backedges. 939 proven. 4350 refuted. 0 times theorem prover too weak. 49902 trivial. 0 not checked. [2020-07-21 13:12:50,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:57,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:57,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:00,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:00,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:02,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:03,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:04,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:05,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:05,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:05,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:05,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:05,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:05,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:06,547 INFO L134 CoverageAnalysis]: Checked inductivity of 55191 backedges. 943 proven. 4402 refuted. 0 times theorem prover too weak. 49846 trivial. 0 not checked. [2020-07-21 13:13:06,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429291343] [2020-07-21 13:13:06,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:06,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:13:06,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208164769] [2020-07-21 13:13:06,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:13:06,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:06,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:13:06,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:13:06,550 INFO L87 Difference]: Start difference. First operand 140 states and 319 transitions. Second operand 25 states. [2020-07-21 13:13:07,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:07,924 INFO L93 Difference]: Finished difference Result 403 states and 2104 transitions. [2020-07-21 13:13:07,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:13:07,925 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1357 [2020-07-21 13:13:07,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:07,933 INFO L225 Difference]: With dead ends: 403 [2020-07-21 13:13:07,933 INFO L226 Difference]: Without dead ends: 201 [2020-07-21 13:13:07,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2723 GetRequests, 2669 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:13:07,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-21 13:13:07,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 150. [2020-07-21 13:13:07,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-21 13:13:07,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-21 13:13:07,973 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 1357 [2020-07-21 13:13:07,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:07,974 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-21 13:13:07,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:13:07,975 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-21 13:13:07,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 854 [2020-07-21 13:13:07,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:07,989 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 60, 60, 52, 44, 32, 32, 32, 32, 32, 32, 32, 30, 30, 30, 30, 30, 30, 30, 22, 16, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:08,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:08,203 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:08,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:08,204 INFO L82 PathProgramCache]: Analyzing trace with hash -487534931, now seen corresponding path program 6 times [2020-07-21 13:13:08,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:08,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370104221] [2020-07-21 13:13:08,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:08,956 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:08,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:08,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 1896 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:13:08,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 21396 backedges. 524 proven. 2010 refuted. 0 times theorem prover too weak. 18862 trivial. 0 not checked. [2020-07-21 13:13:09,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:13,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:15,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:15,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:16,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:17,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:18,177 INFO L134 CoverageAnalysis]: Checked inductivity of 21396 backedges. 524 proven. 2040 refuted. 0 times theorem prover too weak. 18832 trivial. 0 not checked. [2020-07-21 13:13:18,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370104221] [2020-07-21 13:13:18,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:18,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:13:18,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908502414] [2020-07-21 13:13:18,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:13:18,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:18,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:13:18,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:13:18,179 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-21 13:13:18,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:18,752 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-21 13:13:18,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:13:18,754 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 853 [2020-07-21 13:13:18,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:18,763 INFO L225 Difference]: With dead ends: 299 [2020-07-21 13:13:18,763 INFO L226 Difference]: Without dead ends: 285 [2020-07-21 13:13:18,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1713 GetRequests, 1669 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:13:18,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-21 13:13:18,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-21 13:13:18,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-21 13:13:18,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-21 13:13:18,803 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 853 [2020-07-21 13:13:18,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:18,804 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-21 13:13:18,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:13:18,804 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-21 13:13:18,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1020 [2020-07-21 13:13:18,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:18,819 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 74, 74, 60, 58, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 23, 21, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:19,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:19,034 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:19,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:19,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1887782383, now seen corresponding path program 7 times [2020-07-21 13:13:19,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:19,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435234791] [2020-07-21 13:13:19,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:19,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:19,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:19,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 2264 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:13:19,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:20,368 INFO L134 CoverageAnalysis]: Checked inductivity of 30655 backedges. 695 proven. 2424 refuted. 0 times theorem prover too weak. 27536 trivial. 0 not checked. [2020-07-21 13:13:20,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:25,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:25,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:28,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:30,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:30,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:31,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:31,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:31,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:31,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:32,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:32,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:32,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:32,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,121 INFO L134 CoverageAnalysis]: Checked inductivity of 30655 backedges. 697 proven. 2455 refuted. 0 times theorem prover too weak. 27503 trivial. 0 not checked. [2020-07-21 13:13:33,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435234791] [2020-07-21 13:13:33,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:33,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:13:33,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635397870] [2020-07-21 13:13:33,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:13:33,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:33,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:13:33,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:13:33,123 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-21 13:13:34,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:34,051 INFO L93 Difference]: Finished difference Result 251 states and 812 transitions. [2020-07-21 13:13:34,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:13:34,053 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1019 [2020-07-21 13:13:34,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:34,060 INFO L225 Difference]: With dead ends: 251 [2020-07-21 13:13:34,060 INFO L226 Difference]: Without dead ends: 237 [2020-07-21 13:13:34,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2045 GetRequests, 2001 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:13:34,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-21 13:13:34,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 170. [2020-07-21 13:13:34,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-21 13:13:34,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 456 transitions. [2020-07-21 13:13:34,096 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 456 transitions. Word has length 1019 [2020-07-21 13:13:34,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:34,097 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 456 transitions. [2020-07-21 13:13:34,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:13:34,098 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 456 transitions. [2020-07-21 13:13:34,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2015 [2020-07-21 13:13:34,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:34,138 INFO L422 BasicCegarLoop]: trace histogram [161, 161, 134, 134, 127, 110, 80, 80, 80, 80, 80, 80, 80, 67, 67, 67, 67, 67, 67, 67, 60, 34, 30, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:34,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:34,351 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:34,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:34,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1929652474, now seen corresponding path program 8 times [2020-07-21 13:13:34,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:34,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010719224] [2020-07-21 13:13:34,354 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:35,498 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:35,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:35,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 4473 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:13:35,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:37,382 INFO L134 CoverageAnalysis]: Checked inductivity of 122644 backedges. 1127 proven. 6827 refuted. 0 times theorem prover too weak. 114690 trivial. 0 not checked. [2020-07-21 13:13:37,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:52,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:56,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:56,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:58,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:59,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:00,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:00,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:00,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:00,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:00,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:00,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:01,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:02,911 INFO L134 CoverageAnalysis]: Checked inductivity of 122644 backedges. 1131 proven. 6879 refuted. 0 times theorem prover too weak. 114634 trivial. 0 not checked. [2020-07-21 13:14:02,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010719224] [2020-07-21 13:14:02,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:02,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:14:02,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773827076] [2020-07-21 13:14:02,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:14:02,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:02,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:14:02,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:14:02,914 INFO L87 Difference]: Start difference. First operand 170 states and 456 transitions. Second operand 25 states. [2020-07-21 13:14:04,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:04,226 INFO L93 Difference]: Finished difference Result 266 states and 907 transitions. [2020-07-21 13:14:04,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:14:04,229 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2014 [2020-07-21 13:14:04,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:04,234 INFO L225 Difference]: With dead ends: 266 [2020-07-21 13:14:04,234 INFO L226 Difference]: Without dead ends: 200 [2020-07-21 13:14:04,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4037 GetRequests, 3983 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:14:04,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2020-07-21 13:14:04,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 178. [2020-07-21 13:14:04,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2020-07-21 13:14:04,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 483 transitions. [2020-07-21 13:14:04,266 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 483 transitions. Word has length 2014 [2020-07-21 13:14:04,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:04,267 INFO L479 AbstractCegarLoop]: Abstraction has 178 states and 483 transitions. [2020-07-21 13:14:04,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:14:04,267 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 483 transitions. [2020-07-21 13:14:04,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1029 [2020-07-21 13:14:04,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:04,283 INFO L422 BasicCegarLoop]: trace histogram [78, 78, 75, 75, 55, 48, 39, 39, 39, 39, 39, 39, 39, 37, 37, 37, 37, 37, 37, 37, 27, 23, 18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:04,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:04,497 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:04,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:04,497 INFO L82 PathProgramCache]: Analyzing trace with hash 140971615, now seen corresponding path program 9 times [2020-07-21 13:14:04,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:04,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247374695] [2020-07-21 13:14:04,498 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:05,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:14:05,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:14:05,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 2288 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:14:05,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:14:06,037 INFO L134 CoverageAnalysis]: Checked inductivity of 31353 backedges. 629 proven. 2845 refuted. 0 times theorem prover too weak. 27879 trivial. 0 not checked. [2020-07-21 13:14:06,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:14,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:17,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:17,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:19,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:20,223 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 13:14:20,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:22,638 INFO L134 CoverageAnalysis]: Checked inductivity of 31353 backedges. 631 proven. 2883 refuted. 0 times theorem prover too weak. 27839 trivial. 0 not checked. [2020-07-21 13:14:22,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247374695] [2020-07-21 13:14:22,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:22,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:14:22,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975436957] [2020-07-21 13:14:22,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:14:22,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:22,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:14:22,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:14:22,641 INFO L87 Difference]: Start difference. First operand 178 states and 483 transitions. Second operand 23 states. [2020-07-21 13:14:23,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:23,629 INFO L93 Difference]: Finished difference Result 267 states and 914 transitions. [2020-07-21 13:14:23,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:14:23,631 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1028 [2020-07-21 13:14:23,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:23,638 INFO L225 Difference]: With dead ends: 267 [2020-07-21 13:14:23,639 INFO L226 Difference]: Without dead ends: 253 [2020-07-21 13:14:23,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2064 GetRequests, 2015 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:14:23,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-21 13:14:23,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 179. [2020-07-21 13:14:23,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-21 13:14:23,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 489 transitions. [2020-07-21 13:14:23,677 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 489 transitions. Word has length 1028 [2020-07-21 13:14:23,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:23,678 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 489 transitions. [2020-07-21 13:14:23,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:14:23,678 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 489 transitions. [2020-07-21 13:14:23,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1076 [2020-07-21 13:14:23,695 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:23,695 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 77, 77, 66, 60, 40, 40, 40, 40, 40, 40, 40, 38, 38, 38, 38, 38, 38, 38, 26, 22, 20, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:23,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:23,911 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:23,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:23,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1458744635, now seen corresponding path program 10 times [2020-07-21 13:14:23,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:23,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649427806] [2020-07-21 13:14:23,912 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:24,849 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:14:24,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:14:24,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 2388 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:14:24,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:14:25,653 INFO L134 CoverageAnalysis]: Checked inductivity of 34191 backedges. 613 proven. 2639 refuted. 0 times theorem prover too weak. 30939 trivial. 0 not checked. [2020-07-21 13:14:25,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:34,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:37,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:39,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:39,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:40,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:41,673 INFO L134 CoverageAnalysis]: Checked inductivity of 34191 backedges. 613 proven. 2671 refuted. 0 times theorem prover too weak. 30907 trivial. 0 not checked. [2020-07-21 13:14:41,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649427806] [2020-07-21 13:14:41,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:41,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:14:41,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620684841] [2020-07-21 13:14:41,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:14:41,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:41,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:14:41,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:14:41,676 INFO L87 Difference]: Start difference. First operand 179 states and 489 transitions. Second operand 21 states. [2020-07-21 13:14:42,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:42,463 INFO L93 Difference]: Finished difference Result 295 states and 1090 transitions. [2020-07-21 13:14:42,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:14:42,466 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1075 [2020-07-21 13:14:42,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:42,472 INFO L225 Difference]: With dead ends: 295 [2020-07-21 13:14:42,472 INFO L226 Difference]: Without dead ends: 281 [2020-07-21 13:14:42,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2157 GetRequests, 2113 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:14:42,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-21 13:14:42,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 173. [2020-07-21 13:14:42,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 13:14:42,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-21 13:14:42,512 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1075 [2020-07-21 13:14:42,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:42,513 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-21 13:14:42,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:14:42,513 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-21 13:14:42,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1170 [2020-07-21 13:14:42,531 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:42,532 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 83, 83, 70, 66, 44, 44, 44, 44, 44, 44, 44, 41, 41, 41, 41, 41, 41, 41, 26, 25, 22, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:42,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:42,748 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:42,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:42,748 INFO L82 PathProgramCache]: Analyzing trace with hash -546251824, now seen corresponding path program 11 times [2020-07-21 13:14:42,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:42,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585716773] [2020-07-21 13:14:42,749 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:43,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:14:43,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:14:43,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 2597 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:14:43,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:14:44,505 INFO L134 CoverageAnalysis]: Checked inductivity of 40548 backedges. 670 proven. 2480 refuted. 0 times theorem prover too weak. 37398 trivial. 0 not checked. [2020-07-21 13:14:44,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:53,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:53,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:59,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:01,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:01,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:04,051 INFO L134 CoverageAnalysis]: Checked inductivity of 40548 backedges. 670 proven. 2504 refuted. 0 times theorem prover too weak. 37374 trivial. 0 not checked. [2020-07-21 13:15:04,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585716773] [2020-07-21 13:15:04,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:15:04,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:15:04,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995867626] [2020-07-21 13:15:04,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:15:04,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:15:04,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:15:04,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:15:04,054 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 19 states. [2020-07-21 13:15:05,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:15:05,233 INFO L93 Difference]: Finished difference Result 348 states and 1590 transitions. [2020-07-21 13:15:05,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:15:05,238 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1169 [2020-07-21 13:15:05,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:15:05,254 INFO L225 Difference]: With dead ends: 348 [2020-07-21 13:15:05,255 INFO L226 Difference]: Without dead ends: 334 [2020-07-21 13:15:05,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2344 GetRequests, 2305 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:15:05,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-07-21 13:15:05,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 175. [2020-07-21 13:15:05,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-21 13:15:05,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 473 transitions. [2020-07-21 13:15:05,330 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 473 transitions. Word has length 1169 [2020-07-21 13:15:05,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:15:05,331 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 473 transitions. [2020-07-21 13:15:05,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:15:05,332 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 473 transitions. [2020-07-21 13:15:05,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-21 13:15:05,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:15:05,355 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 84, 84, 69, 67, 45, 45, 45, 45, 45, 45, 45, 42, 42, 42, 42, 42, 42, 42, 27, 22, 22, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:15:05,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:05,569 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:15:05,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:15:05,570 INFO L82 PathProgramCache]: Analyzing trace with hash -2134466086, now seen corresponding path program 12 times [2020-07-21 13:15:05,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:15:05,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247080214] [2020-07-21 13:15:05,571 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:06,650 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:15:06,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:15:06,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 2651 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:15:06,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:15:07,583 INFO L134 CoverageAnalysis]: Checked inductivity of 42285 backedges. 933 proven. 3221 refuted. 0 times theorem prover too weak. 38131 trivial. 0 not checked. [2020-07-21 13:15:07,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:15:11,581 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:15:11,690 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:15:16,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:16,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:19,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:19,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:21,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:21,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:23,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:23,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:23,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:24,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:24,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:24,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:24,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:24,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:25,836 INFO L134 CoverageAnalysis]: Checked inductivity of 42285 backedges. 941 proven. 3257 refuted. 0 times theorem prover too weak. 38087 trivial. 0 not checked. [2020-07-21 13:15:25,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247080214] [2020-07-21 13:15:25,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:15:25,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:15:25,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485221729] [2020-07-21 13:15:25,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:15:25,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:15:25,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:15:25,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:15:25,841 INFO L87 Difference]: Start difference. First operand 175 states and 473 transitions. Second operand 23 states. [2020-07-21 13:15:26,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:15:26,850 INFO L93 Difference]: Finished difference Result 298 states and 1041 transitions. [2020-07-21 13:15:26,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:15:26,852 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1193 [2020-07-21 13:15:26,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:15:26,859 INFO L225 Difference]: With dead ends: 298 [2020-07-21 13:15:26,859 INFO L226 Difference]: Without dead ends: 235 [2020-07-21 13:15:26,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2394 GetRequests, 2345 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:15:26,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2020-07-21 13:15:26,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 189. [2020-07-21 13:15:26,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-07-21 13:15:26,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 528 transitions. [2020-07-21 13:15:26,898 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 528 transitions. Word has length 1193 [2020-07-21 13:15:26,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:15:26,898 INFO L479 AbstractCegarLoop]: Abstraction has 189 states and 528 transitions. [2020-07-21 13:15:26,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:15:26,899 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 528 transitions. [2020-07-21 13:15:26,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1291 [2020-07-21 13:15:26,927 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:15:26,928 INFO L422 BasicCegarLoop]: trace histogram [96, 96, 93, 93, 78, 71, 48, 48, 48, 48, 48, 48, 48, 46, 46, 46, 46, 46, 46, 46, 30, 25, 25, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:15:27,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:27,142 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:15:27,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:15:27,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1455584255, now seen corresponding path program 13 times [2020-07-21 13:15:27,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:15:27,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876629648] [2020-07-21 13:15:27,143 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:28,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:15:28,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:15:28,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 2866 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:15:28,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:15:29,272 INFO L134 CoverageAnalysis]: Checked inductivity of 49492 backedges. 819 proven. 3124 refuted. 0 times theorem prover too weak. 45549 trivial. 0 not checked. [2020-07-21 13:15:29,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:15:33,652 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:15:40,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:51,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:51,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:57,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:59,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:59,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:59,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:00,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:00,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:00,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:00,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:00,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:02,224 INFO L134 CoverageAnalysis]: Checked inductivity of 49492 backedges. 821 proven. 3152 refuted. 0 times theorem prover too weak. 45519 trivial. 0 not checked. [2020-07-21 13:16:02,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876629648] [2020-07-21 13:16:02,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:16:02,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:16:02,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651219164] [2020-07-21 13:16:02,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:16:02,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:16:02,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:16:02,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:16:02,227 INFO L87 Difference]: Start difference. First operand 189 states and 528 transitions. Second operand 21 states. [2020-07-21 13:16:03,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:16:03,584 INFO L93 Difference]: Finished difference Result 275 states and 917 transitions. [2020-07-21 13:16:03,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:16:03,590 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1290 [2020-07-21 13:16:03,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:16:03,600 INFO L225 Difference]: With dead ends: 275 [2020-07-21 13:16:03,600 INFO L226 Difference]: Without dead ends: 261 [2020-07-21 13:16:03,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2587 GetRequests, 2543 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:16:03,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-07-21 13:16:03,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 187. [2020-07-21 13:16:03,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-21 13:16:03,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 513 transitions. [2020-07-21 13:16:03,640 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 513 transitions. Word has length 1290 [2020-07-21 13:16:03,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:16:03,641 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 513 transitions. [2020-07-21 13:16:03,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:16:03,642 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 513 transitions. [2020-07-21 13:16:03,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 953 [2020-07-21 13:16:03,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:16:03,655 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 68, 68, 56, 55, 35, 35, 35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 34, 34, 22, 20, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:16:03,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:03,860 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:16:03,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:16:03,861 INFO L82 PathProgramCache]: Analyzing trace with hash -8695630, now seen corresponding path program 14 times [2020-07-21 13:16:03,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:16:03,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671477815] [2020-07-21 13:16:03,862 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:04,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:16:04,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:16:04,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 2115 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:16:04,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:16:05,580 INFO L134 CoverageAnalysis]: Checked inductivity of 26701 backedges. 741 proven. 2158 refuted. 0 times theorem prover too weak. 23802 trivial. 0 not checked. [2020-07-21 13:16:05,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:16:15,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:15,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:21,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:23,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:23,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:24,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:25,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:25,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:25,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:25,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:25,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:27,235 INFO L134 CoverageAnalysis]: Checked inductivity of 26701 backedges. 743 proven. 2189 refuted. 0 times theorem prover too weak. 23769 trivial. 0 not checked. [2020-07-21 13:16:27,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671477815] [2020-07-21 13:16:27,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:16:27,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:16:27,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949590960] [2020-07-21 13:16:27,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:16:27,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:16:27,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:16:27,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:16:27,238 INFO L87 Difference]: Start difference. First operand 187 states and 513 transitions. Second operand 21 states. [2020-07-21 13:16:28,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:16:28,565 INFO L93 Difference]: Finished difference Result 297 states and 1088 transitions. [2020-07-21 13:16:28,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:16:28,570 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 952 [2020-07-21 13:16:28,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:16:28,576 INFO L225 Difference]: With dead ends: 297 [2020-07-21 13:16:28,576 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 13:16:28,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1911 GetRequests, 1867 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:16:28,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 13:16:28,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 216. [2020-07-21 13:16:28,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-21 13:16:28,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 668 transitions. [2020-07-21 13:16:28,623 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 668 transitions. Word has length 952 [2020-07-21 13:16:28,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:16:28,624 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 668 transitions. [2020-07-21 13:16:28,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:16:28,624 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 668 transitions. [2020-07-21 13:16:28,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1409 [2020-07-21 13:16:28,649 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:16:28,650 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 100, 100, 76, 71, 54, 54, 54, 54, 54, 54, 54, 50, 50, 50, 50, 50, 50, 50, 38, 24, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:16:28,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:28,866 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:16:28,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:16:28,867 INFO L82 PathProgramCache]: Analyzing trace with hash -1407323831, now seen corresponding path program 15 times [2020-07-21 13:16:28,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:16:28,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236872181] [2020-07-21 13:16:28,868 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:30,150 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:16:30,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:16:30,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 3132 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:16:30,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:16:31,292 INFO L134 CoverageAnalysis]: Checked inductivity of 59303 backedges. 950 proven. 3922 refuted. 0 times theorem prover too weak. 54431 trivial. 0 not checked. [2020-07-21 13:16:31,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:16:35,178 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:16:35,292 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:16:35,402 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:16:37,079 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:16:37,200 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:16:37,329 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:16:37,453 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:16:37,570 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:16:37,683 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 13:16:37,787 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:16:49,027 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:16:49,130 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:16:49,238 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:16:49,341 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:16:49,448 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:16:49,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:57,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:01,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:02,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:04,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:04,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:04,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:04,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:04,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:06,921 INFO L134 CoverageAnalysis]: Checked inductivity of 59303 backedges. 954 proven. 3958 refuted. 0 times theorem prover too weak. 54391 trivial. 0 not checked. [2020-07-21 13:17:06,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236872181] [2020-07-21 13:17:06,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:17:06,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:17:06,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383815070] [2020-07-21 13:17:06,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:17:06,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:17:06,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:17:06,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:17:06,925 INFO L87 Difference]: Start difference. First operand 216 states and 668 transitions. Second operand 23 states. [2020-07-21 13:17:08,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:17:08,415 INFO L93 Difference]: Finished difference Result 293 states and 1058 transitions. [2020-07-21 13:17:08,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:17:08,420 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1408 [2020-07-21 13:17:08,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:17:08,427 INFO L225 Difference]: With dead ends: 293 [2020-07-21 13:17:08,427 INFO L226 Difference]: Without dead ends: 276 [2020-07-21 13:17:08,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2824 GetRequests, 2775 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:17:08,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2020-07-21 13:17:08,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 209. [2020-07-21 13:17:08,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-07-21 13:17:08,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 628 transitions. [2020-07-21 13:17:08,473 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 628 transitions. Word has length 1408 [2020-07-21 13:17:08,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:17:08,474 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 628 transitions. [2020-07-21 13:17:08,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:17:08,475 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 628 transitions. [2020-07-21 13:17:08,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1140 [2020-07-21 13:17:08,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:17:08,497 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 80, 80, 67, 63, 43, 43, 43, 43, 43, 43, 43, 40, 40, 40, 40, 40, 40, 40, 27, 20, 20, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:17:08,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:08,711 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:17:08,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:17:08,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1559793938, now seen corresponding path program 16 times [2020-07-21 13:17:08,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:17:08,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259002201] [2020-07-21 13:17:08,715 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:09,967 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:17:09,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:17:09,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 2531 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:17:09,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:17:10,865 INFO L134 CoverageAnalysis]: Checked inductivity of 38500 backedges. 779 proven. 2668 refuted. 0 times theorem prover too weak. 35053 trivial. 0 not checked. [2020-07-21 13:17:10,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:17:13,634 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:17:19,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:23,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:23,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:25,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:25,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:25,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:26,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:26,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:26,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:26,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:26,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:27,997 INFO L134 CoverageAnalysis]: Checked inductivity of 38500 backedges. 781 proven. 2696 refuted. 0 times theorem prover too weak. 35023 trivial. 0 not checked. [2020-07-21 13:17:27,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259002201] [2020-07-21 13:17:27,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:17:27,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:17:27,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493237713] [2020-07-21 13:17:28,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:17:28,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:17:28,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:17:28,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:17:28,001 INFO L87 Difference]: Start difference. First operand 209 states and 628 transitions. Second operand 21 states. [2020-07-21 13:17:29,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:17:29,322 INFO L93 Difference]: Finished difference Result 331 states and 1344 transitions. [2020-07-21 13:17:29,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:17:29,328 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1139 [2020-07-21 13:17:29,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:17:29,336 INFO L225 Difference]: With dead ends: 331 [2020-07-21 13:17:29,336 INFO L226 Difference]: Without dead ends: 314 [2020-07-21 13:17:29,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2285 GetRequests, 2241 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:17:29,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-21 13:17:29,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 199. [2020-07-21 13:17:29,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2020-07-21 13:17:29,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 557 transitions. [2020-07-21 13:17:29,389 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 557 transitions. Word has length 1139 [2020-07-21 13:17:29,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:17:29,390 INFO L479 AbstractCegarLoop]: Abstraction has 199 states and 557 transitions. [2020-07-21 13:17:29,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:17:29,390 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 557 transitions. [2020-07-21 13:17:29,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 897 [2020-07-21 13:17:29,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:17:29,407 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 64, 64, 52, 51, 33, 33, 33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 32, 32, 19, 19, 16, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:17:29,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:29,621 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:17:29,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:17:29,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1631281166, now seen corresponding path program 17 times [2020-07-21 13:17:29,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:17:29,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [299371442] [2020-07-21 13:17:29,623 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:30,731 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:17:30,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:17:30,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 1991 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:17:30,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:17:31,323 INFO L134 CoverageAnalysis]: Checked inductivity of 23605 backedges. 688 proven. 1694 refuted. 0 times theorem prover too weak. 21223 trivial. 0 not checked. [2020-07-21 13:17:31,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:17:34,474 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:17:41,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:41,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:45,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:45,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:47,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:47,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:48,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:48,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:49,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:49,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:49,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:49,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:50,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:52,374 INFO L134 CoverageAnalysis]: Checked inductivity of 23605 backedges. 688 proven. 1720 refuted. 0 times theorem prover too weak. 21197 trivial. 0 not checked. [2020-07-21 13:17:52,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [299371442] [2020-07-21 13:17:52,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:17:52,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:17:52,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799237413] [2020-07-21 13:17:52,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:17:52,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:17:52,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:17:52,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:17:52,378 INFO L87 Difference]: Start difference. First operand 199 states and 557 transitions. Second operand 19 states. [2020-07-21 13:17:53,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:17:53,826 INFO L93 Difference]: Finished difference Result 403 states and 2000 transitions. [2020-07-21 13:17:53,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:17:53,833 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 896 [2020-07-21 13:17:53,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:17:53,852 INFO L225 Difference]: With dead ends: 403 [2020-07-21 13:17:53,852 INFO L226 Difference]: Without dead ends: 386 [2020-07-21 13:17:53,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1798 GetRequests, 1759 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:17:53,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2020-07-21 13:17:53,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 201. [2020-07-21 13:17:53,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-21 13:17:53,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 571 transitions. [2020-07-21 13:17:53,930 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 571 transitions. Word has length 896 [2020-07-21 13:17:53,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:17:53,931 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 571 transitions. [2020-07-21 13:17:53,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:17:53,932 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 571 transitions. [2020-07-21 13:17:53,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1033 [2020-07-21 13:17:53,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:17:53,951 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 74, 74, 60, 59, 38, 38, 38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 37, 22, 22, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:17:54,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:54,166 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:17:54,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:17:54,167 INFO L82 PathProgramCache]: Analyzing trace with hash -77605576, now seen corresponding path program 18 times [2020-07-21 13:17:54,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:17:54,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069514201] [2020-07-21 13:17:54,168 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:55,385 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:17:55,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:17:55,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 2293 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:17:55,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:17:56,388 INFO L134 CoverageAnalysis]: Checked inductivity of 31465 backedges. 995 proven. 2937 refuted. 0 times theorem prover too weak. 27533 trivial. 0 not checked. [2020-07-21 13:17:56,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:17:59,292 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:17:59,401 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:17:59,518 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:17:59,634 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:00,240 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:00,369 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:00,509 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:18:00,651 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:18:02,140 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 13:18:02,291 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 13:18:02,451 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:18:02,612 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:18:02,767 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 13:18:02,912 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 13:18:03,046 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:18:03,174 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 13:18:03,293 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:18:03,408 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 13:18:13,174 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:13,912 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:14,028 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:14,148 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:14,271 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:14,944 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:15,065 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:15,198 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:18:15,338 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:18:15,479 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 13:18:15,611 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 13:18:15,724 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:18:16,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:20,622 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:20,729 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:20,842 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:20,956 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:21,478 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:21,602 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:21,735 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:21,867 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:21,992 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:18:22,112 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 13:18:22,226 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:18:22,333 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:22,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:22,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:26,344 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:18:26,462 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:26,577 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:26,702 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:26,826 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:26,944 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:18:27,051 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 13:18:27,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:27,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:29,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:29,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:30,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:30,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:33,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:33,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:37,015 INFO L134 CoverageAnalysis]: Checked inductivity of 31465 backedges. 997 proven. 2991 refuted. 0 times theorem prover too weak. 27477 trivial. 0 not checked. [2020-07-21 13:18:37,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069514201] [2020-07-21 13:18:37,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:37,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:18:37,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845882041] [2020-07-21 13:18:37,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:18:37,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:37,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:18:37,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:18:37,018 INFO L87 Difference]: Start difference. First operand 201 states and 571 transitions. Second operand 25 states. [2020-07-21 13:18:39,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:39,933 INFO L93 Difference]: Finished difference Result 292 states and 938 transitions. [2020-07-21 13:18:39,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:18:39,940 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1032 [2020-07-21 13:18:39,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:39,947 INFO L225 Difference]: With dead ends: 292 [2020-07-21 13:18:39,947 INFO L226 Difference]: Without dead ends: 249 [2020-07-21 13:18:39,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2073 GetRequests, 2019 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:18:39,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-21 13:18:39,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 240. [2020-07-21 13:18:39,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 13:18:39,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-21 13:18:39,998 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 1032 [2020-07-21 13:18:39,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:39,999 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-21 13:18:39,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:18:39,999 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-21 13:18:40,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 925 [2020-07-21 13:18:40,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:40,019 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 64, 64, 55, 52, 35, 35, 35, 35, 35, 35, 35, 32, 32, 32, 32, 32, 32, 32, 23, 17, 16, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:40,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:40,229 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:40,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:40,230 INFO L82 PathProgramCache]: Analyzing trace with hash 511498992, now seen corresponding path program 19 times [2020-07-21 13:18:40,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:40,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928569356] [2020-07-21 13:18:40,231 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:41,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:41,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:41,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 2053 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:18:41,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:42,392 INFO L134 CoverageAnalysis]: Checked inductivity of 25179 backedges. 905 proven. 2257 refuted. 0 times theorem prover too weak. 22017 trivial. 0 not checked. [2020-07-21 13:18:42,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:44,703 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:18:44,815 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:18:44,928 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:18:45,416 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:45,535 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:45,665 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:45,791 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:46,568 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:46,708 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:46,855 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:47,000 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:48,232 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:48,377 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:48,530 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:18:48,684 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:18:48,844 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:18:48,988 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 13:18:49,112 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 13:18:49,231 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 13:18:49,353 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:18:49,467 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 13:18:57,402 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:18:57,510 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:18:57,626 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:18:57,743 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:18:58,279 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:58,404 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:18:58,538 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:58,668 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:59,501 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:59,641 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:59,793 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:59,945 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:19:00,093 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:19:00,230 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 13:19:00,358 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:19:00,476 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 13:19:00,586 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:19:00,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:04,780 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:19:04,886 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:19:05,002 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:05,119 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:05,660 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:19:05,786 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:19:05,921 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:19:06,056 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:19:06,180 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:19:06,298 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 13:19:06,408 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:19:06,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:06,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:10,488 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:10,596 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:10,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:13,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:15,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:17,571 INFO L134 CoverageAnalysis]: Checked inductivity of 25179 backedges. 909 proven. 2299 refuted. 0 times theorem prover too weak. 21971 trivial. 0 not checked. [2020-07-21 13:19:17,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928569356] [2020-07-21 13:19:17,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:17,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:19:17,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865048856] [2020-07-21 13:19:17,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:19:17,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:17,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:19:17,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:19:17,573 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 23 states. [2020-07-21 13:19:20,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:20,013 INFO L93 Difference]: Finished difference Result 386 states and 1408 transitions. [2020-07-21 13:19:20,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:19:20,021 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 924 [2020-07-21 13:19:20,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:20,029 INFO L225 Difference]: With dead ends: 386 [2020-07-21 13:19:20,029 INFO L226 Difference]: Without dead ends: 343 [2020-07-21 13:19:20,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1856 GetRequests, 1807 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:19:20,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2020-07-21 13:19:20,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 233. [2020-07-21 13:19:20,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-21 13:19:20,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 645 transitions. [2020-07-21 13:19:20,087 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 645 transitions. Word has length 924 [2020-07-21 13:19:20,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:20,088 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 645 transitions. [2020-07-21 13:19:20,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:19:20,088 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 645 transitions. [2020-07-21 13:19:20,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1048 [2020-07-21 13:19:20,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:20,101 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 76, 76, 62, 60, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 24, 22, 17, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:20,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:20,302 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:20,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:20,304 INFO L82 PathProgramCache]: Analyzing trace with hash -900013399, now seen corresponding path program 20 times [2020-07-21 13:19:20,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:20,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67736323] [2020-07-21 13:19:20,305 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:21,601 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:21,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:21,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 2326 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:19:21,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:22,424 INFO L134 CoverageAnalysis]: Checked inductivity of 32389 backedges. 737 proven. 2073 refuted. 0 times theorem prover too weak. 29579 trivial. 0 not checked. [2020-07-21 13:19:22,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:25,097 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:19:25,200 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:19:26,024 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:19:26,137 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:19:26,257 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:26,375 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:28,404 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:19:28,530 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:19:28,666 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:19:28,803 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:19:28,935 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:19:29,053 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:19:29,165 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:19:41,975 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:19:42,088 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:19:42,213 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:42,336 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:19:42,451 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:19:42,556 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 13:19:42,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,348 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:19:47,454 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:19:47,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:51,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:53,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:53,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:53,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:53,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:53,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:55,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:57,338 INFO L134 CoverageAnalysis]: Checked inductivity of 32389 backedges. 739 proven. 2095 refuted. 0 times theorem prover too weak. 29555 trivial. 0 not checked. [2020-07-21 13:19:57,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67736323] [2020-07-21 13:19:57,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:57,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:19:57,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596238258] [2020-07-21 13:19:57,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:19:57,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:57,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:19:57,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:19:57,341 INFO L87 Difference]: Start difference. First operand 233 states and 645 transitions. Second operand 19 states. [2020-07-21 13:19:58,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:58,705 INFO L93 Difference]: Finished difference Result 397 states and 1559 transitions. [2020-07-21 13:19:58,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:19:58,713 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1047 [2020-07-21 13:19:58,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:58,728 INFO L225 Difference]: With dead ends: 397 [2020-07-21 13:19:58,728 INFO L226 Difference]: Without dead ends: 379 [2020-07-21 13:19:58,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2100 GetRequests, 2061 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:19:58,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2020-07-21 13:19:58,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 244. [2020-07-21 13:19:58,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-21 13:19:58,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 690 transitions. [2020-07-21 13:19:58,813 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 690 transitions. Word has length 1047 [2020-07-21 13:19:58,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:58,814 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 690 transitions. [2020-07-21 13:19:58,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:19:58,815 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 690 transitions. [2020-07-21 13:19:58,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1125 [2020-07-21 13:19:58,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:58,838 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 81, 81, 64, 63, 42, 42, 42, 42, 42, 42, 42, 40, 40, 40, 40, 40, 40, 40, 24, 21, 20, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:59,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:59,052 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:59,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:59,052 INFO L82 PathProgramCache]: Analyzing trace with hash 2045985927, now seen corresponding path program 21 times [2020-07-21 13:19:59,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:59,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323242060] [2020-07-21 13:19:59,053 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:00,469 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:00,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:00,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 2498 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:20:00,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:01,443 INFO L134 CoverageAnalysis]: Checked inductivity of 37437 backedges. 895 proven. 2511 refuted. 0 times theorem prover too weak. 34031 trivial. 0 not checked. [2020-07-21 13:20:01,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:03,917 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:20:04,129 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:20:04,237 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:20:05,885 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:20:06,004 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:20:06,118 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:20:06,238 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:20:07,165 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:20:07,283 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:20:07,413 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:20:07,550 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:20:07,685 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:20:07,796 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 13:20:15,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:15,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:24,469 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:20:24,575 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:20:24,690 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:20:24,802 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:20:24,910 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:20:25,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:29,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:29,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:30,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:30,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:30,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:30,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:31,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:31,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:31,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:31,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:31,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:32,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:34,825 INFO L134 CoverageAnalysis]: Checked inductivity of 37437 backedges. 899 proven. 2537 refuted. 0 times theorem prover too weak. 34001 trivial. 0 not checked. [2020-07-21 13:20:34,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323242060] [2020-07-21 13:20:34,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:34,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:20:34,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148318365] [2020-07-21 13:20:34,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:20:34,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:34,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:20:34,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:20:34,829 INFO L87 Difference]: Start difference. First operand 244 states and 690 transitions. Second operand 21 states. [2020-07-21 13:20:35,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:35,992 INFO L93 Difference]: Finished difference Result 330 states and 1052 transitions. [2020-07-21 13:20:35,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:20:35,996 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1124 [2020-07-21 13:20:35,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:36,004 INFO L225 Difference]: With dead ends: 330 [2020-07-21 13:20:36,004 INFO L226 Difference]: Without dead ends: 310 [2020-07-21 13:20:36,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2255 GetRequests, 2211 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:20:36,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-07-21 13:20:36,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 233. [2020-07-21 13:20:36,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-21 13:20:36,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 622 transitions. [2020-07-21 13:20:36,037 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 622 transitions. Word has length 1124 [2020-07-21 13:20:36,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:36,037 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 622 transitions. [2020-07-21 13:20:36,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:20:36,037 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 622 transitions. [2020-07-21 13:20:36,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1379 [2020-07-21 13:20:36,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:36,058 INFO L422 BasicCegarLoop]: trace histogram [108, 108, 95, 95, 78, 75, 54, 54, 54, 54, 54, 54, 54, 47, 47, 47, 47, 47, 47, 47, 33, 28, 24, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:36,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:36,259 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:36,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:36,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1162269628, now seen corresponding path program 22 times [2020-07-21 13:20:36,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:36,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272113436] [2020-07-21 13:20:36,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:37,786 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:37,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:37,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 3063 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:20:37,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:39,935 INFO L134 CoverageAnalysis]: Checked inductivity of 56798 backedges. 881 proven. 3348 refuted. 0 times theorem prover too weak. 52569 trivial. 0 not checked. [2020-07-21 13:20:39,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:42,559 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:20:42,666 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:20:42,785 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:20:42,902 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:20:44,923 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:20:45,041 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:20:45,175 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:20:45,309 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:20:45,436 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:20:45,554 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:20:45,661 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:20:54,099 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:20:55,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:00,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:03,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:04,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:04,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:04,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:04,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:05,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:05,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:05,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:05,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:07,712 INFO L134 CoverageAnalysis]: Checked inductivity of 56798 backedges. 881 proven. 3380 refuted. 0 times theorem prover too weak. 52537 trivial. 0 not checked. [2020-07-21 13:21:07,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272113436] [2020-07-21 13:21:07,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:21:07,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:21:07,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015424730] [2020-07-21 13:21:07,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:21:07,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:21:07,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:21:07,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:21:07,717 INFO L87 Difference]: Start difference. First operand 233 states and 622 transitions. Second operand 21 states. [2020-07-21 13:21:08,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:21:08,876 INFO L93 Difference]: Finished difference Result 339 states and 1103 transitions. [2020-07-21 13:21:08,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:21:08,881 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1378 [2020-07-21 13:21:08,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:21:08,890 INFO L225 Difference]: With dead ends: 339 [2020-07-21 13:21:08,890 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 13:21:08,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2763 GetRequests, 2719 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:21:08,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 13:21:08,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-21 13:21:08,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 13:21:08,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 571 transitions. [2020-07-21 13:21:08,921 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 571 transitions. Word has length 1378 [2020-07-21 13:21:08,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:21:08,922 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 571 transitions. [2020-07-21 13:21:08,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:21:08,922 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 571 transitions. [2020-07-21 13:21:08,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1158 [2020-07-21 13:21:08,940 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:21:08,941 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 81, 81, 68, 68, 44, 44, 44, 44, 44, 44, 44, 40, 40, 40, 40, 40, 40, 40, 28, 24, 20, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:21:09,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:09,142 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:21:09,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:21:09,143 INFO L82 PathProgramCache]: Analyzing trace with hash -2072484477, now seen corresponding path program 23 times [2020-07-21 13:21:09,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:21:09,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880751365] [2020-07-21 13:21:09,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:10,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:21:10,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:21:10,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 2570 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:21:10,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:21:11,654 INFO L134 CoverageAnalysis]: Checked inductivity of 39732 backedges. 1109 proven. 2470 refuted. 0 times theorem prover too weak. 36153 trivial. 0 not checked. [2020-07-21 13:21:11,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:21:15,669 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:21:15,775 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:21:22,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:31,117 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:21:31,230 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:21:31,352 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:21:31,472 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:21:31,587 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:21:31,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:33,506 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:21:33,609 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:21:33,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:33,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:35,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:36,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:36,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:37,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:37,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:37,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:39,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:43,846 INFO L134 CoverageAnalysis]: Checked inductivity of 39732 backedges. 1113 proven. 2499 refuted. 0 times theorem prover too weak. 36120 trivial. 0 not checked. [2020-07-21 13:21:43,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880751365] [2020-07-21 13:21:43,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:21:43,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:21:43,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536627812] [2020-07-21 13:21:43,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:21:43,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:21:43,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:21:43,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:21:43,851 INFO L87 Difference]: Start difference. First operand 222 states and 571 transitions. Second operand 21 states. [2020-07-21 13:21:45,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:21:45,832 INFO L93 Difference]: Finished difference Result 339 states and 1150 transitions. [2020-07-21 13:21:45,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:21:45,841 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1157 [2020-07-21 13:21:45,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:21:45,850 INFO L225 Difference]: With dead ends: 339 [2020-07-21 13:21:45,851 INFO L226 Difference]: Without dead ends: 330 [2020-07-21 13:21:45,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2321 GetRequests, 2277 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:21:45,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2020-07-21 13:21:45,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 266. [2020-07-21 13:21:45,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-07-21 13:21:45,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 794 transitions. [2020-07-21 13:21:45,912 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 794 transitions. Word has length 1157 [2020-07-21 13:21:45,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:21:45,913 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 794 transitions. [2020-07-21 13:21:45,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:21:45,913 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 794 transitions. [2020-07-21 13:21:45,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1412 [2020-07-21 13:21:45,939 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:21:45,939 INFO L422 BasicCegarLoop]: trace histogram [113, 113, 96, 96, 78, 72, 56, 56, 56, 56, 56, 56, 56, 48, 48, 48, 48, 48, 48, 48, 41, 24, 22, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:21:46,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:46,141 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:21:46,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:21:46,142 INFO L82 PathProgramCache]: Analyzing trace with hash -1138547371, now seen corresponding path program 24 times [2020-07-21 13:21:46,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:21:46,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581601367] [2020-07-21 13:21:46,143 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:47,724 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:21:47,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:21:47,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 3138 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:21:47,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:21:49,036 INFO L134 CoverageAnalysis]: Checked inductivity of 59783 backedges. 1277 proven. 3682 refuted. 0 times theorem prover too weak. 54824 trivial. 0 not checked. [2020-07-21 13:21:49,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:21:51,519 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:21:51,625 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:21:51,740 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:21:51,856 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:21:51,983 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:21:52,107 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:21:53,559 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:53,693 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:53,837 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:53,975 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:55,204 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:55,353 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:55,516 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:21:55,678 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:21:57,990 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:21:58,161 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:21:58,345 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:21:58,526 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:21:58,705 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:21:58,869 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 13:21:59,022 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:21:59,167 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 13:21:59,304 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:21:59,430 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 13:21:59,550 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:21:59,657 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:13,162 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:13,271 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:13,391 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:13,510 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:13,638 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:13,756 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:15,312 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:15,460 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:15,617 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:15,771 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:17,109 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:17,275 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:17,453 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:22:17,631 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:22:17,794 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:22:17,952 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 13:22:18,099 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:22:18,236 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:22:18,361 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:22:18,481 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:18,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:26,787 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:22:26,896 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:22:27,014 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:27,132 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:27,261 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:27,388 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:27,524 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:27,661 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:29,254 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:29,402 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:29,559 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:29,714 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:29,860 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:22:29,997 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:22:30,124 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:22:30,241 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:30,348 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 13:22:30,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:40,067 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:22:40,174 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:22:40,292 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:40,410 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:40,538 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:40,664 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:40,792 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:40,930 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:41,059 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:22:41,177 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:41,284 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 13:22:41,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:43,133 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:22:43,248 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:22:43,367 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:43,484 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:22:43,594 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:43,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:45,009 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 13:22:45,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:46,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:46,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:46,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:47,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:47,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:47,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:49,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:53,142 INFO L134 CoverageAnalysis]: Checked inductivity of 59783 backedges. 1283 proven. 3720 refuted. 0 times theorem prover too weak. 54780 trivial. 0 not checked. [2020-07-21 13:22:53,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581601367] [2020-07-21 13:22:53,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:22:53,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:22:53,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255815109] [2020-07-21 13:22:53,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:22:53,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:22:53,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:22:53,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:22:53,146 INFO L87 Difference]: Start difference. First operand 266 states and 794 transitions. Second operand 23 states. [2020-07-21 13:22:55,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:22:55,956 INFO L93 Difference]: Finished difference Result 372 states and 1248 transitions. [2020-07-21 13:22:55,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:22:55,965 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1411 [2020-07-21 13:22:55,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:22:55,973 INFO L225 Difference]: With dead ends: 372 [2020-07-21 13:22:55,973 INFO L226 Difference]: Without dead ends: 323 [2020-07-21 13:22:55,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2830 GetRequests, 2781 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:22:55,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-21 13:22:56,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 284. [2020-07-21 13:22:56,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 13:22:56,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 927 transitions. [2020-07-21 13:22:56,034 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 927 transitions. Word has length 1411 [2020-07-21 13:22:56,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:22:56,035 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 927 transitions. [2020-07-21 13:22:56,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:22:56,035 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 927 transitions. [2020-07-21 13:22:56,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 933 [2020-07-21 13:22:56,048 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:22:56,049 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 66, 66, 53, 50, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 21, 18, 17, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:22:56,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:22:56,250 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:22:56,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:22:56,251 INFO L82 PathProgramCache]: Analyzing trace with hash 296814709, now seen corresponding path program 25 times [2020-07-21 13:22:56,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:22:56,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960001504] [2020-07-21 13:22:56,253 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:22:57,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:22:57,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:22:57,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 2072 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:22:57,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:22:58,383 INFO L134 CoverageAnalysis]: Checked inductivity of 25615 backedges. 752 proven. 1688 refuted. 0 times theorem prover too weak. 23175 trivial. 0 not checked. [2020-07-21 13:22:58,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:01,842 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:01,948 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:03,067 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:03,182 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:03,311 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:23:03,432 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:23:03,562 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:23:03,691 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:23:03,810 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:23:03,916 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:23:13,917 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:23:14,023 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:23:14,142 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:23:14,260 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:23:15,197 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:23:15,323 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:23:15,458 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:15,595 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:15,767 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:23:15,915 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 13:23:16,047 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:16,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:22,693 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:23:22,804 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:23:22,923 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:23:23,042 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 13:23:23,151 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:23,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:23,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:28,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:30,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:30,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:30,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:31,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:31,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:31,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:31,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:33,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:36,186 INFO L134 CoverageAnalysis]: Checked inductivity of 25615 backedges. 752 proven. 1711 refuted. 0 times theorem prover too weak. 23152 trivial. 0 not checked. [2020-07-21 13:23:36,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960001504] [2020-07-21 13:23:36,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:36,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:23:36,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243023297] [2020-07-21 13:23:36,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:23:36,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:36,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:23:36,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:23:36,189 INFO L87 Difference]: Start difference. First operand 284 states and 927 transitions. Second operand 19 states. [2020-07-21 13:23:38,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:38,249 INFO L93 Difference]: Finished difference Result 465 states and 2008 transitions. [2020-07-21 13:23:38,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:23:38,259 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 932 [2020-07-21 13:23:38,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:38,274 INFO L225 Difference]: With dead ends: 465 [2020-07-21 13:23:38,274 INFO L226 Difference]: Without dead ends: 447 [2020-07-21 13:23:38,279 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1870 GetRequests, 1831 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:23:38,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-07-21 13:23:38,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 275. [2020-07-21 13:23:38,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2020-07-21 13:23:38,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 870 transitions. [2020-07-21 13:23:38,335 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 870 transitions. Word has length 932 [2020-07-21 13:23:38,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:38,336 INFO L479 AbstractCegarLoop]: Abstraction has 275 states and 870 transitions. [2020-07-21 13:23:38,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:23:38,336 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 870 transitions. [2020-07-21 13:23:38,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1058 [2020-07-21 13:23:38,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:38,350 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 76, 76, 61, 59, 39, 39, 39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 38, 38, 22, 21, 20, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:38,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:38,552 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:38,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:38,553 INFO L82 PathProgramCache]: Analyzing trace with hash -444416950, now seen corresponding path program 26 times [2020-07-21 13:23:38,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:38,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [314850469] [2020-07-21 13:23:38,554 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:40,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:40,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:40,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 2349 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:23:40,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:41,231 INFO L134 CoverageAnalysis]: Checked inductivity of 33041 backedges. 1123 proven. 2471 refuted. 0 times theorem prover too weak. 29447 trivial. 0 not checked. [2020-07-21 13:23:41,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:43,932 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-21 13:23:44,042 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-21 13:23:44,500 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 13:23:44,623 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 13:23:44,761 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:44,896 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:45,039 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:45,183 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:45,339 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:23:45,493 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:23:46,420 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:23:46,582 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:23:46,752 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:23:46,925 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:23:49,039 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:23:49,224 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:23:49,418 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:23:49,611 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:23:49,800 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:23:49,974 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 13:23:50,142 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 13:23:50,295 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 13:23:50,441 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 13:23:50,575 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:23:50,698 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:23:50,813 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:23:50,917 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:24:02,616 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-21 13:24:03,020 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 13:24:03,140 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 13:24:03,266 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:24:03,388 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:24:03,522 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:24:03,657 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:24:03,797 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:24:03,916 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:24:04,722 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:24:04,872 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:24:05,023 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:24:05,149 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:24:05,303 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:24:05,448 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:24:05,577 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:24:05,697 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 13:24:05,811 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:24:05,917 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:24:06,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:11,761 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 13:24:11,870 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 13:24:11,993 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:24:12,115 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:24:12,243 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:24:12,372 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:24:12,512 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:24:12,645 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:24:12,753 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51