/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench/mannadiv.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:58:00,495 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:58:00,497 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:58:00,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:58:00,509 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:58:00,510 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:58:00,512 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:58:00,513 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:58:00,515 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:58:00,516 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:58:00,517 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:58:00,518 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:58:00,518 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:58:00,519 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:58:00,520 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:58:00,521 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:58:00,522 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:58:00,523 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:58:00,525 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:58:00,527 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:58:00,528 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:58:00,530 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:58:00,531 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:58:00,532 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:58:00,534 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:58:00,542 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:58:00,543 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:58:00,544 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:58:00,544 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 14:58:00,560 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:58:00,560 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:58:00,562 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:58:00,562 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:58:00,563 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:58:00,563 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:58:00,563 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:58:00,563 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:58:00,563 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:58:00,564 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:58:00,564 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:58:00,564 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:58:00,565 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:58:00,565 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:58:00,565 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:58:00,566 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:58:00,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:58:00,566 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:58:00,566 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:58:00,566 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:58:00,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:58:00,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:58:00,567 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:58:00,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:58:00,568 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:58:00,568 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:58:00,568 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:00,568 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:58:00,569 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:58:00,569 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 14:58:00,861 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:58:00,875 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:58:00,878 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:58:00,879 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:58:00,880 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:58:00,880 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 14:58:00,948 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42d7f0bf1/3000479404a24d588971c5080f26f797/FLAGcd4a56779 [2020-07-20 14:58:01,408 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:58:01,409 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 14:58:01,414 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42d7f0bf1/3000479404a24d588971c5080f26f797/FLAGcd4a56779 [2020-07-20 14:58:01,754 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42d7f0bf1/3000479404a24d588971c5080f26f797 [2020-07-20 14:58:01,762 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:58:01,765 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:58:01,767 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:58:01,767 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:58:01,770 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:58:01,771 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:58:01" (1/1) ... [2020-07-20 14:58:01,774 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bdc3886 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:01, skipping insertion in model container [2020-07-20 14:58:01,774 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:58:01" (1/1) ... [2020-07-20 14:58:01,782 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:58:01,805 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:58:02,034 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:58:02,038 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:58:02,055 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:58:02,066 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:58:02,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02 WrapperNode [2020-07-20 14:58:02,067 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:58:02,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:58:02,068 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:58:02,068 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:58:02,077 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... [2020-07-20 14:58:02,077 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... [2020-07-20 14:58:02,081 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... [2020-07-20 14:58:02,082 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... [2020-07-20 14:58:02,086 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... [2020-07-20 14:58:02,090 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... [2020-07-20 14:58:02,091 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... [2020-07-20 14:58:02,093 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:58:02,094 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:58:02,094 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:58:02,094 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:58:02,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:58:02,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:58:02,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:58:02,241 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:58:02,241 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:58:02,241 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:58:02,241 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:58:02,241 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:58:02,241 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:58:02,241 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:58:02,242 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:58:02,242 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:58:02,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:58:02,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:58:02,438 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:58:02,439 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 14:58:02,444 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:58:02 BoogieIcfgContainer [2020-07-20 14:58:02,444 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:58:02,460 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:58:02,463 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:58:02,470 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:58:02,471 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:58:01" (1/3) ... [2020-07-20 14:58:02,472 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61039309 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:58:02, skipping insertion in model container [2020-07-20 14:58:02,472 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:58:02" (2/3) ... [2020-07-20 14:58:02,473 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61039309 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:58:02, skipping insertion in model container [2020-07-20 14:58:02,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:58:02" (3/3) ... [2020-07-20 14:58:02,477 INFO L109 eAbstractionObserver]: Analyzing ICFG mannadiv.c [2020-07-20 14:58:02,503 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:58:02,518 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:58:02,543 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:58:02,566 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:58:02,567 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:58:02,567 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:58:02,567 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:58:02,567 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:58:02,567 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:58:02,567 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:58:02,567 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:58:02,584 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 14:58:02,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 14:58:02,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:02,591 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:02,591 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:02,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:02,597 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-20 14:58:02,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:02,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085390521] [2020-07-20 14:58:02,604 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:02,672 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:58:02,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:02,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 14:58:02,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:02,701 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 14:58:02,701 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:58:02,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085390521] [2020-07-20 14:58:02,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:58:02,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 14:58:02,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453233180] [2020-07-20 14:58:02,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 14:58:02,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:02,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 14:58:02,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:58:02,721 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-20 14:58:02,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:02,745 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-20 14:58:02,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 14:58:02,747 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-20 14:58:02,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:02,756 INFO L225 Difference]: With dead ends: 50 [2020-07-20 14:58:02,756 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 14:58:02,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:58:02,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 14:58:02,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 14:58:02,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 14:58:02,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-20 14:58:02,799 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-20 14:58:02,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:02,799 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-20 14:58:02,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 14:58:02,800 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-20 14:58:02,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 14:58:02,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:02,802 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:03,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:03,016 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:03,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:03,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-20 14:58:03,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:03,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1043810417] [2020-07-20 14:58:03,019 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:03,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:58:03,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:03,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 14:58:03,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:03,217 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:58:03,218 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:58:03,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1043810417] [2020-07-20 14:58:03,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:58:03,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 14:58:03,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750275256] [2020-07-20 14:58:03,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:58:03,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:03,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:58:03,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:58:03,224 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 8 states. [2020-07-20 14:58:03,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:03,411 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 14:58:03,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 14:58:03,413 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-20 14:58:03,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:03,415 INFO L225 Difference]: With dead ends: 34 [2020-07-20 14:58:03,415 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 14:58:03,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 14:58:03,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 14:58:03,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-20 14:58:03,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 14:58:03,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 14:58:03,437 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-20 14:58:03,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:03,441 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 14:58:03,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:58:03,441 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 14:58:03,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 14:58:03,443 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:03,444 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:03,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:03,658 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:03,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:03,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-20 14:58:03,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:03,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761929076] [2020-07-20 14:58:03,661 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:03,708 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:58:03,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:03,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 14:58:03,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:03,820 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 14:58:03,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:03,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:03,933 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 14:58:03,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:03,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:04,001 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 14:58:04,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761929076] [2020-07-20 14:58:04,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:04,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2020-07-20 14:58:04,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035109676] [2020-07-20 14:58:04,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 14:58:04,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:04,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 14:58:04,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:58:04,005 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 12 states. [2020-07-20 14:58:04,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:04,170 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2020-07-20 14:58:04,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 14:58:04,171 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2020-07-20 14:58:04,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:04,174 INFO L225 Difference]: With dead ends: 40 [2020-07-20 14:58:04,174 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 14:58:04,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2020-07-20 14:58:04,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 14:58:04,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2020-07-20 14:58:04,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 14:58:04,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 14:58:04,183 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-20 14:58:04,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:04,183 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 14:58:04,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 14:58:04,184 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 14:58:04,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 14:58:04,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:04,185 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:04,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:04,391 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:04,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:04,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-20 14:58:04,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:04,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [552760534] [2020-07-20 14:58:04,395 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:04,438 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:58:04,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:04,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:58:04,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:04,498 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 14:58:04,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:04,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:04,582 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 14:58:04,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [552760534] [2020-07-20 14:58:04,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:04,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 14:58:04,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289920199] [2020-07-20 14:58:04,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:58:04,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:04,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:58:04,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:58:04,585 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-07-20 14:58:08,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:08,783 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2020-07-20 14:58:08,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 14:58:08,784 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 14:58:08,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:08,786 INFO L225 Difference]: With dead ends: 56 [2020-07-20 14:58:08,786 INFO L226 Difference]: Without dead ends: 46 [2020-07-20 14:58:08,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-20 14:58:08,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-20 14:58:08,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-07-20 14:58:08,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 14:58:08,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2020-07-20 14:58:08,800 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 29 [2020-07-20 14:58:08,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:08,801 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2020-07-20 14:58:08,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:58:08,801 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2020-07-20 14:58:08,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 14:58:08,803 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:08,803 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:09,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:09,014 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:09,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:09,014 INFO L82 PathProgramCache]: Analyzing trace with hash 802873865, now seen corresponding path program 1 times [2020-07-20 14:58:09,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:09,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281678609] [2020-07-20 14:58:09,015 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:09,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 14:58:09,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:09,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:58:09,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:09,087 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 14:58:09,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:09,130 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 14:58:09,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281678609] [2020-07-20 14:58:09,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:09,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-20 14:58:09,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508954245] [2020-07-20 14:58:09,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:58:09,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:09,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:58:09,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:58:09,133 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand 6 states. [2020-07-20 14:58:09,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:09,220 INFO L93 Difference]: Finished difference Result 76 states and 94 transitions. [2020-07-20 14:58:09,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 14:58:09,221 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-20 14:58:09,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:09,223 INFO L225 Difference]: With dead ends: 76 [2020-07-20 14:58:09,223 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 14:58:09,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-07-20 14:58:09,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 14:58:09,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-07-20 14:58:09,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 14:58:09,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 81 transitions. [2020-07-20 14:58:09,242 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 81 transitions. Word has length 45 [2020-07-20 14:58:09,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:09,242 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 81 transitions. [2020-07-20 14:58:09,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:58:09,243 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 81 transitions. [2020-07-20 14:58:09,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 14:58:09,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:09,245 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:09,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:09,459 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:09,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:09,460 INFO L82 PathProgramCache]: Analyzing trace with hash -208243385, now seen corresponding path program 2 times [2020-07-20 14:58:09,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:09,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582477014] [2020-07-20 14:58:09,462 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:09,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:58:09,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:09,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 14:58:09,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:09,627 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 14:58:09,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:09,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:09,857 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 14:58:09,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582477014] [2020-07-20 14:58:09,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:09,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 14:58:09,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835821002] [2020-07-20 14:58:09,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 14:58:09,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:09,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 14:58:09,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:58:09,860 INFO L87 Difference]: Start difference. First operand 66 states and 81 transitions. Second operand 12 states. [2020-07-20 14:58:20,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:20,419 INFO L93 Difference]: Finished difference Result 112 states and 141 transitions. [2020-07-20 14:58:20,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 14:58:20,461 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-07-20 14:58:20,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:20,463 INFO L225 Difference]: With dead ends: 112 [2020-07-20 14:58:20,464 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 14:58:20,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-20 14:58:20,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 14:58:20,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2020-07-20 14:58:20,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 14:58:20,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 139 transitions. [2020-07-20 14:58:20,489 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 139 transitions. Word has length 45 [2020-07-20 14:58:20,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:20,490 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 139 transitions. [2020-07-20 14:58:20,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 14:58:20,490 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 139 transitions. [2020-07-20 14:58:20,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 14:58:20,492 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:20,493 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:20,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:20,706 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:20,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:20,707 INFO L82 PathProgramCache]: Analyzing trace with hash -53426768, now seen corresponding path program 2 times [2020-07-20 14:58:20,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:20,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131181725] [2020-07-20 14:58:20,709 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:20,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:58:20,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:20,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 14:58:20,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:20,924 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 14:58:20,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:20,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:21,380 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 14:58:21,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131181725] [2020-07-20 14:58:21,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:21,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 14:58:21,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545414937] [2020-07-20 14:58:21,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 14:58:21,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:21,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 14:58:21,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:58:21,383 INFO L87 Difference]: Start difference. First operand 110 states and 139 transitions. Second operand 14 states. [2020-07-20 14:58:21,739 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-20 14:58:24,272 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 14:58:24,514 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-20 14:58:24,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:24,575 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-20 14:58:24,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 14:58:24,580 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-07-20 14:58:24,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:24,583 INFO L225 Difference]: With dead ends: 148 [2020-07-20 14:58:24,583 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 14:58:24,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-20 14:58:24,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 14:58:24,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-20 14:58:24,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 14:58:24,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 109 transitions. [2020-07-20 14:58:24,617 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 109 transitions. Word has length 53 [2020-07-20 14:58:24,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:24,618 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 109 transitions. [2020-07-20 14:58:24,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 14:58:24,618 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 109 transitions. [2020-07-20 14:58:24,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 14:58:24,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:24,623 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:24,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:24,840 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:24,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:24,840 INFO L82 PathProgramCache]: Analyzing trace with hash 10333007, now seen corresponding path program 3 times [2020-07-20 14:58:24,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:24,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662586672] [2020-07-20 14:58:24,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:24,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 14:58:24,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:24,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:58:24,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:24,935 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 14:58:24,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:25,021 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 14:58:25,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662586672] [2020-07-20 14:58:25,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:25,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 14:58:25,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554771627] [2020-07-20 14:58:25,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 14:58:25,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:25,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 14:58:25,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-20 14:58:25,024 INFO L87 Difference]: Start difference. First operand 90 states and 109 transitions. Second operand 10 states. [2020-07-20 14:58:25,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:25,150 INFO L93 Difference]: Finished difference Result 136 states and 171 transitions. [2020-07-20 14:58:25,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 14:58:25,153 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 61 [2020-07-20 14:58:25,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:25,155 INFO L225 Difference]: With dead ends: 136 [2020-07-20 14:58:25,155 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 14:58:25,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:58:25,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 14:58:25,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2020-07-20 14:58:25,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-07-20 14:58:25,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 140 transitions. [2020-07-20 14:58:25,174 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 140 transitions. Word has length 61 [2020-07-20 14:58:25,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:25,175 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 140 transitions. [2020-07-20 14:58:25,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 14:58:25,175 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 140 transitions. [2020-07-20 14:58:25,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 14:58:25,177 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:25,177 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:25,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:25,391 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:25,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:25,392 INFO L82 PathProgramCache]: Analyzing trace with hash -185889457, now seen corresponding path program 4 times [2020-07-20 14:58:25,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:25,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844185177] [2020-07-20 14:58:25,394 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:25,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 14:58:25,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:25,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:58:25,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:25,476 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 14:58:25,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:25,540 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 14:58:25,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844185177] [2020-07-20 14:58:25,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:25,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 14:58:25,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535387766] [2020-07-20 14:58:25,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 14:58:25,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:25,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 14:58:25,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 14:58:25,542 INFO L87 Difference]: Start difference. First operand 114 states and 140 transitions. Second operand 9 states. [2020-07-20 14:58:25,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:25,730 INFO L93 Difference]: Finished difference Result 132 states and 161 transitions. [2020-07-20 14:58:25,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 14:58:25,732 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-07-20 14:58:25,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:25,734 INFO L225 Difference]: With dead ends: 132 [2020-07-20 14:58:25,734 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 14:58:25,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:58:25,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 14:58:25,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2020-07-20 14:58:25,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-07-20 14:58:25,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 137 transitions. [2020-07-20 14:58:25,774 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 137 transitions. Word has length 61 [2020-07-20 14:58:25,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:25,775 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 137 transitions. [2020-07-20 14:58:25,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 14:58:25,776 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 137 transitions. [2020-07-20 14:58:25,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 14:58:25,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:25,778 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:25,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:25,980 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:25,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:25,980 INFO L82 PathProgramCache]: Analyzing trace with hash -377856460, now seen corresponding path program 5 times [2020-07-20 14:58:25,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:25,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220401362] [2020-07-20 14:58:25,982 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:26,040 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:58:26,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:26,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 14:58:26,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:26,388 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 14:58:26,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:26,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:27,355 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 14:58:27,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220401362] [2020-07-20 14:58:27,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:27,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-20 14:58:27,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120362500] [2020-07-20 14:58:27,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 14:58:27,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:27,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 14:58:27,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:58:27,358 INFO L87 Difference]: Start difference. First operand 114 states and 137 transitions. Second operand 18 states. [2020-07-20 14:58:30,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:30,940 INFO L93 Difference]: Finished difference Result 132 states and 154 transitions. [2020-07-20 14:58:30,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 14:58:30,946 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-07-20 14:58:30,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:30,947 INFO L225 Difference]: With dead ends: 132 [2020-07-20 14:58:30,947 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 14:58:30,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2020-07-20 14:58:30,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 14:58:30,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-07-20 14:58:30,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 14:58:30,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 97 transitions. [2020-07-20 14:58:30,959 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 97 transitions. Word has length 69 [2020-07-20 14:58:30,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:30,959 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 97 transitions. [2020-07-20 14:58:30,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 14:58:30,959 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 97 transitions. [2020-07-20 14:58:30,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 14:58:30,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:30,961 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:31,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:31,176 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:31,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:31,176 INFO L82 PathProgramCache]: Analyzing trace with hash 728435349, now seen corresponding path program 6 times [2020-07-20 14:58:31,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:31,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315902597] [2020-07-20 14:58:31,177 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:31,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 14:58:31,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:31,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 14:58:31,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:31,315 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 14:58:31,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:31,432 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 14:58:31,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315902597] [2020-07-20 14:58:31,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:31,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-20 14:58:31,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841001013] [2020-07-20 14:58:31,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 14:58:31,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:31,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 14:58:31,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-20 14:58:31,435 INFO L87 Difference]: Start difference. First operand 82 states and 97 transitions. Second operand 13 states. [2020-07-20 14:58:31,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:31,617 INFO L93 Difference]: Finished difference Result 140 states and 174 transitions. [2020-07-20 14:58:31,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 14:58:31,619 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-07-20 14:58:31,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:31,621 INFO L225 Difference]: With dead ends: 140 [2020-07-20 14:58:31,621 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 14:58:31,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-20 14:58:31,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 14:58:31,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-07-20 14:58:31,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-07-20 14:58:31,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 144 transitions. [2020-07-20 14:58:31,641 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 144 transitions. Word has length 77 [2020-07-20 14:58:31,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:31,642 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 144 transitions. [2020-07-20 14:58:31,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 14:58:31,642 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 144 transitions. [2020-07-20 14:58:31,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 14:58:31,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:31,646 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:31,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:31,859 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:31,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:31,860 INFO L82 PathProgramCache]: Analyzing trace with hash -323556203, now seen corresponding path program 7 times [2020-07-20 14:58:31,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:31,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634041356] [2020-07-20 14:58:31,860 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:31,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 14:58:31,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:31,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 14:58:31,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:31,980 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 14:58:31,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:32,078 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 14:58:32,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634041356] [2020-07-20 14:58:32,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:32,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 14:58:32,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577129737] [2020-07-20 14:58:32,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 14:58:32,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:32,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 14:58:32,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:58:32,082 INFO L87 Difference]: Start difference. First operand 118 states and 144 transitions. Second operand 12 states. [2020-07-20 14:58:32,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:58:32,479 INFO L93 Difference]: Finished difference Result 140 states and 170 transitions. [2020-07-20 14:58:32,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 14:58:32,482 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2020-07-20 14:58:32,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:58:32,483 INFO L225 Difference]: With dead ends: 140 [2020-07-20 14:58:32,484 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 14:58:32,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 139 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-20 14:58:32,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 14:58:32,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-07-20 14:58:32,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-07-20 14:58:32,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 142 transitions. [2020-07-20 14:58:32,508 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 142 transitions. Word has length 77 [2020-07-20 14:58:32,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:58:32,508 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 142 transitions. [2020-07-20 14:58:32,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 14:58:32,508 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 142 transitions. [2020-07-20 14:58:32,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 14:58:32,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:58:32,511 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:58:32,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:32,725 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:58:32,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:58:32,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1534824776, now seen corresponding path program 8 times [2020-07-20 14:58:32,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:58:32,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52486079] [2020-07-20 14:58:32,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:58:32,772 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:58:32,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:58:32,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 14:58:32,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:58:33,363 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 14:58:33,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:58:33,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:58:34,832 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 14:58:34,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52486079] [2020-07-20 14:58:34,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:58:34,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 14:58:34,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613779788] [2020-07-20 14:58:34,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 14:58:34,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:58:34,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 14:58:34,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2020-07-20 14:58:34,834 INFO L87 Difference]: Start difference. First operand 118 states and 142 transitions. Second operand 22 states. [2020-07-20 14:58:39,057 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 14:58:44,117 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-07-20 14:59:04,105 WARN L193 SmtUtils]: Spent 1.70 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 14:59:42,516 WARN L193 SmtUtils]: Spent 6.00 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 15:00:26,550 WARN L193 SmtUtils]: Spent 5.11 s on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 15:00:47,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:00:47,773 INFO L93 Difference]: Finished difference Result 224 states and 274 transitions. [2020-07-20 15:00:47,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 15:00:47,780 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 85 [2020-07-20 15:00:47,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:00:47,782 INFO L225 Difference]: With dead ends: 224 [2020-07-20 15:00:47,782 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 15:00:47,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 75.3s TimeCoverageRelationStatistics Valid=126, Invalid=989, Unknown=7, NotChecked=0, Total=1122 [2020-07-20 15:00:47,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 15:00:47,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2020-07-20 15:00:47,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-20 15:00:47,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 235 transitions. [2020-07-20 15:00:47,805 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 235 transitions. Word has length 85 [2020-07-20 15:00:47,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:00:47,805 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 235 transitions. [2020-07-20 15:00:47,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 15:00:47,806 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 235 transitions. [2020-07-20 15:00:47,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 15:00:47,807 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:00:47,807 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:00:48,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:00:48,010 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:00:48,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:00:48,011 INFO L82 PathProgramCache]: Analyzing trace with hash -2106989411, now seen corresponding path program 9 times [2020-07-20 15:00:48,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:00:48,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970097362] [2020-07-20 15:00:48,012 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:00:48,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 15:00:48,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:00:48,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 15:00:48,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:00:48,368 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:00:48,602 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:00:48,965 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:00:49,385 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:00:49,965 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:00:50,610 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:00:51,333 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:00:51,944 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 15:00:52,808 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 15:00:52,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 15:00:53,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 15:01:04,179 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 15:01:04,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970097362] [2020-07-20 15:01:04,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 15:01:04,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-20 15:01:04,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603178755] [2020-07-20 15:01:04,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 15:01:04,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:04,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 15:01:04,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-07-20 15:01:04,182 INFO L87 Difference]: Start difference. First operand 194 states and 235 transitions. Second operand 24 states. [2020-07-20 15:01:09,469 WARN L193 SmtUtils]: Spent 2.86 s on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-20 15:01:13,117 WARN L193 SmtUtils]: Spent 2.74 s on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 15:01:18,706 WARN L193 SmtUtils]: Spent 445.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 15:01:20,352 WARN L193 SmtUtils]: Spent 609.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 15:01:22,861 WARN L193 SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 15:01:25,154 WARN L193 SmtUtils]: Spent 727.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 15:01:29,651 WARN L193 SmtUtils]: Spent 2.94 s on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 15:01:32,636 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 15:01:35,263 WARN L193 SmtUtils]: Spent 1.10 s on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 15:01:35,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:35,476 INFO L93 Difference]: Finished difference Result 212 states and 252 transitions. [2020-07-20 15:01:35,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 15:01:35,491 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2020-07-20 15:01:35,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:35,492 INFO L225 Difference]: With dead ends: 212 [2020-07-20 15:01:35,492 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 15:01:35,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 38.0s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 15:01:35,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 15:01:35,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2020-07-20 15:01:35,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-20 15:01:35,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 183 transitions. [2020-07-20 15:01:35,510 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 183 transitions. Word has length 93 [2020-07-20 15:01:35,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:35,511 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 183 transitions. [2020-07-20 15:01:35,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 15:01:35,511 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 183 transitions. [2020-07-20 15:01:35,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 15:01:35,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:35,512 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:01:35,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:35,727 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:35,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:35,728 INFO L82 PathProgramCache]: Analyzing trace with hash -178978853, now seen corresponding path program 10 times [2020-07-20 15:01:35,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:35,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102686317] [2020-07-20 15:01:35,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:35,759 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:01:35,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:35,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 15:01:35,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:35,858 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 15:01:35,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 15:01:36,017 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 15:01:36,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102686317] [2020-07-20 15:01:36,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 15:01:36,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-20 15:01:36,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233910534] [2020-07-20 15:01:36,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 15:01:36,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:36,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 15:01:36,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-07-20 15:01:36,019 INFO L87 Difference]: Start difference. First operand 154 states and 183 transitions. Second operand 15 states. [2020-07-20 15:01:37,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:37,462 INFO L93 Difference]: Finished difference Result 204 states and 248 transitions. [2020-07-20 15:01:37,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 15:01:37,469 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-07-20 15:01:37,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:37,471 INFO L225 Difference]: With dead ends: 204 [2020-07-20 15:01:37,471 INFO L226 Difference]: Without dead ends: 182 [2020-07-20 15:01:37,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2020-07-20 15:01:37,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2020-07-20 15:01:37,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2020-07-20 15:01:37,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-07-20 15:01:37,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 220 transitions. [2020-07-20 15:01:37,495 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 220 transitions. Word has length 93 [2020-07-20 15:01:37,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:37,495 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 220 transitions. [2020-07-20 15:01:37,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 15:01:37,496 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 220 transitions. [2020-07-20 15:01:37,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 15:01:37,498 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:37,498 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:01:37,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:37,713 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:37,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:37,713 INFO L82 PathProgramCache]: Analyzing trace with hash -837428226, now seen corresponding path program 11 times [2020-07-20 15:01:37,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:37,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142703199] [2020-07-20 15:01:37,715 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:37,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 15:01:37,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:37,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 15:01:37,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:38,068 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:01:38,336 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:01:38,614 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:01:38,923 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:01:39,378 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:01:39,907 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:01:40,488 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:01:41,121 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:01:42,124 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 15:01:43,013 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 15:01:43,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 15:01:43,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 15:02:02,838 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 15:02:02,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142703199] [2020-07-20 15:02:02,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 15:02:02,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-20 15:02:02,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581982655] [2020-07-20 15:02:02,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 15:02:02,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:02:02,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 15:02:02,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=583, Unknown=0, NotChecked=0, Total=650 [2020-07-20 15:02:02,840 INFO L87 Difference]: Start difference. First operand 182 states and 220 transitions. Second operand 26 states. [2020-07-20 15:02:19,771 WARN L193 SmtUtils]: Spent 606.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 15:02:21,813 WARN L193 SmtUtils]: Spent 507.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 15:02:36,711 WARN L193 SmtUtils]: Spent 586.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 15:02:42,092 WARN L193 SmtUtils]: Spent 605.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 15:02:44,130 WARN L193 SmtUtils]: Spent 742.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 15:03:22,793 WARN L193 SmtUtils]: Spent 5.12 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 15:04:24,469 WARN L193 SmtUtils]: Spent 7.84 s on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 15:04:34,466 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 15:04:48,315 WARN L193 SmtUtils]: Spent 1.33 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 15:05:07,524 WARN L193 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 15:05:42,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:05:42,391 INFO L93 Difference]: Finished difference Result 316 states and 383 transitions. [2020-07-20 15:05:42,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 15:05:42,423 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 101 [2020-07-20 15:05:42,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:05:42,425 INFO L225 Difference]: With dead ends: 316 [2020-07-20 15:05:42,425 INFO L226 Difference]: Without dead ends: 282 [2020-07-20 15:05:42,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 159.4s TimeCoverageRelationStatistics Valid=147, Invalid=1389, Unknown=24, NotChecked=0, Total=1560 [2020-07-20 15:05:42,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-20 15:05:42,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 282. [2020-07-20 15:05:42,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2020-07-20 15:05:42,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 341 transitions. [2020-07-20 15:05:42,454 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 341 transitions. Word has length 101 [2020-07-20 15:05:42,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:05:42,455 INFO L479 AbstractCegarLoop]: Abstraction has 282 states and 341 transitions. [2020-07-20 15:05:42,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 15:05:42,455 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 341 transitions. [2020-07-20 15:05:42,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 15:05:42,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:05:42,457 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:05:42,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:42,670 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:05:42,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:05:42,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1126316255, now seen corresponding path program 12 times [2020-07-20 15:05:42,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:05:42,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462059379] [2020-07-20 15:05:42,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:42,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:05:42,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:05:42,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 15:05:42,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:05:42,844 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-20 15:05:42,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 15:05:43,075 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-20 15:05:43,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462059379] [2020-07-20 15:05:43,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 15:05:43,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2020-07-20 15:05:43,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078544423] [2020-07-20 15:05:43,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 15:05:43,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:05:43,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 15:05:43,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2020-07-20 15:05:43,078 INFO L87 Difference]: Start difference. First operand 282 states and 341 transitions. Second operand 18 states. [2020-07-20 15:05:44,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:05:44,970 INFO L93 Difference]: Finished difference Result 344 states and 422 transitions. [2020-07-20 15:05:44,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 15:05:44,980 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2020-07-20 15:05:44,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:05:44,983 INFO L225 Difference]: With dead ends: 344 [2020-07-20 15:05:44,983 INFO L226 Difference]: Without dead ends: 318 [2020-07-20 15:05:44,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2020-07-20 15:05:44,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2020-07-20 15:05:45,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 318. [2020-07-20 15:05:45,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-20 15:05:45,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 389 transitions. [2020-07-20 15:05:45,014 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 389 transitions. Word has length 109 [2020-07-20 15:05:45,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:05:45,015 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 389 transitions. [2020-07-20 15:05:45,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 15:05:45,015 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 389 transitions. [2020-07-20 15:05:45,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 15:05:45,017 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:05:45,017 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:05:45,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:45,221 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:05:45,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:05:45,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1251867972, now seen corresponding path program 13 times [2020-07-20 15:05:45,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:05:45,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511183457] [2020-07-20 15:05:45,223 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:45,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 15:05:45,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:05:45,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 15:05:45,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:05:45,426 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:05:45,763 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:05:46,142 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:05:46,571 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:05:47,100 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:05:47,559 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 15:05:48,210 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:05:48,974 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:05:49,822 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:05:50,772 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:05:51,826 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 15:05:53,335 WARN L193 SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 15:05:54,755 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 15:05:54,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 15:05:56,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 15:06:36,026 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 15:06:36,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511183457] [2020-07-20 15:06:36,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 15:06:36,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-20 15:06:36,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700073452] [2020-07-20 15:06:36,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 15:06:36,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:06:36,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 15:06:36,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2020-07-20 15:06:36,029 INFO L87 Difference]: Start difference. First operand 318 states and 389 transitions. Second operand 30 states. [2020-07-20 15:06:42,775 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 1) (+ (* 2 c_main_~y2~0) (* 5 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0))) (= (+ c_main_~x1~0 4) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-20 15:06:59,056 WARN L193 SmtUtils]: Spent 774.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 15:07:18,383 WARN L193 SmtUtils]: Spent 833.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 15:07:47,401 WARN L193 SmtUtils]: Spent 580.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 15:08:09,538 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 15:08:16,199 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 15:09:01,141 WARN L193 SmtUtils]: Spent 1.11 s on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 15:09:04,766 WARN L193 SmtUtils]: Spent 746.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 15:09:15,406 WARN L193 SmtUtils]: Spent 819.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 15:09:27,716 WARN L193 SmtUtils]: Spent 753.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 15:09:34,887 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 15:09:38,421 WARN L193 SmtUtils]: Spent 957.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 15:10:39,111 WARN L193 SmtUtils]: Spent 6.37 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 15:10:56,984 WARN L193 SmtUtils]: Spent 2.96 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 15:11:12,001 WARN L193 SmtUtils]: Spent 1.82 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 15:11:34,894 WARN L193 SmtUtils]: Spent 1.10 s on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 15:11:57,826 WARN L193 SmtUtils]: Spent 1.40 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 15:12:15,980 WARN L193 SmtUtils]: Spent 347.00 ms on a formula simplification that was a NOOP. DAG size: 18