/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 DAGSIZE --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 22:57:04,598 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:57:04,601 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:57:04,613 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:57:04,613 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:57:04,614 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:57:04,616 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:57:04,618 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:57:04,622 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:57:04,623 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:57:04,624 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:57:04,629 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:57:04,630 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:57:04,634 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:57:04,635 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:57:04,636 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:57:04,637 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:57:04,640 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:57:04,642 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:57:04,644 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:57:04,648 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:57:04,653 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:57:04,654 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:57:04,655 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:57:04,660 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:57:04,673 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:57:04,674 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:57:04,675 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:57:04,676 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 22:57:04,711 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:57:04,712 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:57:04,717 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:57:04,717 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:57:04,718 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:57:04,718 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:57:04,718 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:57:04,720 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:57:04,721 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:57:04,721 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:57:04,721 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:57:04,721 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:57:04,721 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:57:04,721 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:57:04,722 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:57:04,722 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:57:04,722 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:57:04,722 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:57:04,722 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:57:04,723 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:57:04,723 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:57:04,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:57:04,726 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:57:04,727 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:57:04,727 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:57:04,727 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:57:04,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:04,727 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:57:04,728 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:57:04,728 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 -> DAGSIZE 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 22:57:05,002 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:57:05,019 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:57:05,024 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:57:05,026 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:57:05,029 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:57:05,031 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 22:57:05,109 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/491f2e7c5/39540f7d13464da9a45481787204a136/FLAGeb97f4a4f [2020-07-20 22:57:05,579 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:57:05,579 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 22:57:05,585 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/491f2e7c5/39540f7d13464da9a45481787204a136/FLAGeb97f4a4f [2020-07-20 22:57:05,956 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/491f2e7c5/39540f7d13464da9a45481787204a136 [2020-07-20 22:57:05,967 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:57:05,970 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:57:05,971 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:57:05,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:57:05,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:57:05,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:57:05" (1/1) ... [2020-07-20 22:57:05,982 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f0e332a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:05, skipping insertion in model container [2020-07-20 22:57:05,982 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:57:05" (1/1) ... [2020-07-20 22:57:05,991 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:57:06,008 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:57:06,193 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:57:06,198 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:57:06,217 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:57:06,232 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:57:06,232 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06 WrapperNode [2020-07-20 22:57:06,232 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:57:06,233 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:57:06,233 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:57:06,233 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:57:06,245 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (1/1) ... [2020-07-20 22:57:06,245 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (1/1) ... [2020-07-20 22:57:06,250 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (1/1) ... [2020-07-20 22:57:06,250 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (1/1) ... [2020-07-20 22:57:06,255 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (1/1) ... [2020-07-20 22:57:06,347 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (1/1) ... [2020-07-20 22:57:06,349 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (1/1) ... [2020-07-20 22:57:06,352 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:57:06,353 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:57:06,353 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:57:06,353 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:57:06,354 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (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 22:57:06,428 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:57:06,428 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:57:06,428 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 22:57:06,428 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:57:06,429 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:57:06,429 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:57:06,429 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 22:57:06,429 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 22:57:06,429 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 22:57:06,429 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:57:06,430 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:57:06,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:57:06,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:57:06,627 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:57:06,628 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:57:06,632 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:57:06 BoogieIcfgContainer [2020-07-20 22:57:06,632 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:57:06,633 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:57:06,633 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:57:06,636 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:57:06,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:57:05" (1/3) ... [2020-07-20 22:57:06,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12ff6ff2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:57:06, skipping insertion in model container [2020-07-20 22:57:06,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:57:06" (2/3) ... [2020-07-20 22:57:06,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12ff6ff2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:57:06, skipping insertion in model container [2020-07-20 22:57:06,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:57:06" (3/3) ... [2020-07-20 22:57:06,640 INFO L109 eAbstractionObserver]: Analyzing ICFG mannadiv.c [2020-07-20 22:57:06,651 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:57:06,659 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:57:06,673 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:57:06,697 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:57:06,697 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:57:06,697 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:57:06,697 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:57:06,697 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:57:06,697 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:57:06,698 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:57:06,698 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:57:06,716 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 22:57:06,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 22:57:06,723 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:06,724 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 22:57:06,724 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:06,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:06,729 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-20 22:57:06,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:06,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192799693] [2020-07-20 22:57:06,736 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 22:57:06,815 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:57:06,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:06,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 22:57:06,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:06,856 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 22:57:06,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:57:06,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192799693] [2020-07-20 22:57:06,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:57:06,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 22:57:06,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8931611] [2020-07-20 22:57:06,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 22:57:06,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:06,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 22:57:06,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 22:57:06,890 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-20 22:57:06,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:06,923 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-20 22:57:06,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 22:57:06,925 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-20 22:57:06,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:06,935 INFO L225 Difference]: With dead ends: 50 [2020-07-20 22:57:06,936 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 22:57:06,940 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 22:57:06,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 22:57:06,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 22:57:06,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 22:57:06,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-20 22:57:06,987 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-20 22:57:06,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:06,988 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-20 22:57:06,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 22:57:06,988 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-20 22:57:06,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 22:57:06,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:06,990 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 22:57:07,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:07,207 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:07,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:07,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-20 22:57:07,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:07,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431625536] [2020-07-20 22:57:07,210 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 22:57:07,253 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:57:07,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:07,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 22:57:07,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:07,374 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 22:57:07,375 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:57:07,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431625536] [2020-07-20 22:57:07,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:57:07,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 22:57:07,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95564632] [2020-07-20 22:57:07,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 22:57:07,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:07,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 22:57:07,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:57:07,384 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 8 states. [2020-07-20 22:57:07,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:07,532 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 22:57:07,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:57:07,533 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-20 22:57:07,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:07,536 INFO L225 Difference]: With dead ends: 34 [2020-07-20 22:57:07,536 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 22:57:07,537 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 22:57:07,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 22:57:07,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-20 22:57:07,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 22:57:07,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 22:57:07,549 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-20 22:57:07,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:07,551 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 22:57:07,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 22:57:07,551 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 22:57:07,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 22:57:07,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:07,553 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 22:57:07,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:07,769 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:07,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:07,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-20 22:57:07,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:07,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284728638] [2020-07-20 22:57:07,773 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:57:07,806 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:57:07,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:07,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 22:57:07,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:07,895 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 22:57:07,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:07,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:07,998 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 22:57:07,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:08,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:08,070 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 22:57:08,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284728638] [2020-07-20 22:57:08,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:08,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-20 22:57:08,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102797746] [2020-07-20 22:57:08,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 22:57:08,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:08,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 22:57:08,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-20 22:57:08,073 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2020-07-20 22:57:10,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:10,250 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-07-20 22:57:10,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:57:10,251 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 22:57:10,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:10,254 INFO L225 Difference]: With dead ends: 37 [2020-07-20 22:57:10,254 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 22:57:10,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-07-20 22:57:10,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 22:57:10,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-07-20 22:57:10,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 22:57:10,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 22:57:10,263 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-20 22:57:10,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:10,263 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 22:57:10,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 22:57:10,264 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 22:57:10,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 22:57:10,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:10,265 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 22:57:10,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:10,479 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:10,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:10,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-20 22:57:10,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:10,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615947955] [2020-07-20 22:57:10,482 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 22:57:10,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:57:10,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:10,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 22:57:10,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:10,575 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 22:57:10,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:10,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:10,643 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 22:57:10,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615947955] [2020-07-20 22:57:10,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:10,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 22:57:10,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628027743] [2020-07-20 22:57:10,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 22:57:10,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:10,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 22:57:10,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:57:10,646 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-07-20 22:57:15,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:15,008 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-07-20 22:57:15,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:57:15,013 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 22:57:15,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:15,014 INFO L225 Difference]: With dead ends: 72 [2020-07-20 22:57:15,015 INFO L226 Difference]: Without dead ends: 56 [2020-07-20 22:57:15,017 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 22:57:15,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-20 22:57:15,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-20 22:57:15,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 22:57:15,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2020-07-20 22:57:15,046 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 29 [2020-07-20 22:57:15,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:15,047 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2020-07-20 22:57:15,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 22:57:15,047 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2020-07-20 22:57:15,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 22:57:15,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:15,049 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 22:57:15,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:15,256 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:15,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:15,257 INFO L82 PathProgramCache]: Analyzing trace with hash 802873865, now seen corresponding path program 1 times [2020-07-20 22:57:15,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:15,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912885535] [2020-07-20 22:57:15,258 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 22:57:15,287 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:57:15,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:15,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:57:15,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:15,328 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 22:57:15,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:15,378 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 22:57:15,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912885535] [2020-07-20 22:57:15,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:15,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-20 22:57:15,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169188552] [2020-07-20 22:57:15,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:57:15,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:15,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:57:15,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:57:15,380 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand 6 states. [2020-07-20 22:57:15,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:15,445 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-20 22:57:15,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 22:57:15,446 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-20 22:57:15,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:15,448 INFO L225 Difference]: With dead ends: 86 [2020-07-20 22:57:15,448 INFO L226 Difference]: Without dead ends: 70 [2020-07-20 22:57:15,449 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 22:57:15,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-20 22:57:15,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-20 22:57:15,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 22:57:15,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2020-07-20 22:57:15,465 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 45 [2020-07-20 22:57:15,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:15,468 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2020-07-20 22:57:15,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:57:15,468 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2020-07-20 22:57:15,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 22:57:15,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:15,470 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 22:57:15,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:15,685 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:15,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:15,686 INFO L82 PathProgramCache]: Analyzing trace with hash -208243385, now seen corresponding path program 2 times [2020-07-20 22:57:15,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:15,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109385073] [2020-07-20 22:57:15,688 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 22:57:15,730 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:57:15,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:15,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 22:57:15,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:15,844 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 22:57:15,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:15,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:16,102 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 22:57:16,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109385073] [2020-07-20 22:57:16,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:16,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 22:57:16,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667382389] [2020-07-20 22:57:16,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 22:57:16,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:16,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 22:57:16,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:57:16,105 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 12 states. [2020-07-20 22:57:27,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:27,238 INFO L93 Difference]: Finished difference Result 124 states and 150 transitions. [2020-07-20 22:57:27,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 22:57:27,264 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-07-20 22:57:27,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:27,266 INFO L225 Difference]: With dead ends: 124 [2020-07-20 22:57:27,266 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 22:57:27,267 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 22:57:27,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 22:57:27,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 112. [2020-07-20 22:57:27,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 22:57:27,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 136 transitions. [2020-07-20 22:57:27,292 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 136 transitions. Word has length 45 [2020-07-20 22:57:27,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:27,293 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 136 transitions. [2020-07-20 22:57:27,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 22:57:27,293 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 136 transitions. [2020-07-20 22:57:27,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 22:57:27,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:27,296 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 22:57:27,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:27,499 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:27,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:27,500 INFO L82 PathProgramCache]: Analyzing trace with hash -53426768, now seen corresponding path program 2 times [2020-07-20 22:57:27,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:27,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449056854] [2020-07-20 22:57:27,501 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 22:57:27,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:57:27,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:27,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 22:57:27,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:27,754 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 22:57:27,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:27,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:28,347 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 22:57:28,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449056854] [2020-07-20 22:57:28,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:28,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 22:57:28,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769937232] [2020-07-20 22:57:28,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 22:57:28,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:28,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 22:57:28,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:57:28,351 INFO L87 Difference]: Start difference. First operand 112 states and 136 transitions. Second operand 14 states. [2020-07-20 22:57:28,632 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-20 22:57:31,245 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 22:57:31,915 WARN L193 SmtUtils]: Spent 459.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-20 22:57:31,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:31,992 INFO L93 Difference]: Finished difference Result 156 states and 183 transitions. [2020-07-20 22:57:31,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 22:57:31,996 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-07-20 22:57:31,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:31,997 INFO L225 Difference]: With dead ends: 156 [2020-07-20 22:57:31,997 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 22:57:31,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-20 22:57:31,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 22:57:32,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-20 22:57:32,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 22:57:32,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 115 transitions. [2020-07-20 22:57:32,015 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 115 transitions. Word has length 53 [2020-07-20 22:57:32,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:32,016 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 115 transitions. [2020-07-20 22:57:32,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 22:57:32,016 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 115 transitions. [2020-07-20 22:57:32,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 22:57:32,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:32,018 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 22:57:32,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:32,232 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:32,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:32,233 INFO L82 PathProgramCache]: Analyzing trace with hash 10333007, now seen corresponding path program 3 times [2020-07-20 22:57:32,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:32,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563897661] [2020-07-20 22:57:32,234 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 22:57:32,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:57:32,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:32,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 22:57:32,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:32,355 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 22:57:32,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:32,428 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 22:57:32,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563897661] [2020-07-20 22:57:32,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:32,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 22:57:32,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961576562] [2020-07-20 22:57:32,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 22:57:32,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:32,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 22:57:32,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-20 22:57:32,431 INFO L87 Difference]: Start difference. First operand 98 states and 115 transitions. Second operand 10 states. [2020-07-20 22:57:32,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:32,586 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-20 22:57:32,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 22:57:32,591 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 61 [2020-07-20 22:57:32,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:32,593 INFO L225 Difference]: With dead ends: 148 [2020-07-20 22:57:32,594 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 22:57:32,595 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 22:57:32,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 22:57:32,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-20 22:57:32,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 22:57:32,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 138 transitions. [2020-07-20 22:57:32,637 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 138 transitions. Word has length 61 [2020-07-20 22:57:32,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:32,641 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 138 transitions. [2020-07-20 22:57:32,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 22:57:32,641 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 138 transitions. [2020-07-20 22:57:32,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 22:57:32,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:32,643 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 22:57:32,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:32,862 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:32,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:32,862 INFO L82 PathProgramCache]: Analyzing trace with hash -185889457, now seen corresponding path program 4 times [2020-07-20 22:57:32,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:32,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623778267] [2020-07-20 22:57:32,863 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 22:57:32,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:57:32,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:32,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 22:57:32,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:32,946 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 22:57:32,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:33,040 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 22:57:33,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623778267] [2020-07-20 22:57:33,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:33,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 22:57:33,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007098335] [2020-07-20 22:57:33,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 22:57:33,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:33,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 22:57:33,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 22:57:33,043 INFO L87 Difference]: Start difference. First operand 116 states and 138 transitions. Second operand 9 states. [2020-07-20 22:57:33,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:33,195 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2020-07-20 22:57:33,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:57:33,199 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-07-20 22:57:33,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:33,203 INFO L225 Difference]: With dead ends: 134 [2020-07-20 22:57:33,203 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 22:57:33,205 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 22:57:33,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 22:57:33,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-20 22:57:33,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 22:57:33,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 135 transitions. [2020-07-20 22:57:33,239 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 135 transitions. Word has length 61 [2020-07-20 22:57:33,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:33,240 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 135 transitions. [2020-07-20 22:57:33,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 22:57:33,240 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 135 transitions. [2020-07-20 22:57:33,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 22:57:33,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:33,244 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 22:57:33,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:33,454 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:33,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:33,454 INFO L82 PathProgramCache]: Analyzing trace with hash -377856460, now seen corresponding path program 5 times [2020-07-20 22:57:33,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:33,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762044834] [2020-07-20 22:57:33,455 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 22:57:33,495 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:57:33,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:33,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 22:57:33,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:33,943 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 22:57:33,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:34,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:35,002 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 22:57:35,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762044834] [2020-07-20 22:57:35,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:35,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-20 22:57:35,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169283181] [2020-07-20 22:57:35,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 22:57:35,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:35,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 22:57:35,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-07-20 22:57:35,005 INFO L87 Difference]: Start difference. First operand 116 states and 135 transitions. Second operand 18 states. [2020-07-20 22:57:35,555 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 22:57:36,065 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 22:57:36,298 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-20 22:57:36,639 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 22:57:36,983 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 22:57:39,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:39,515 INFO L93 Difference]: Finished difference Result 140 states and 156 transitions. [2020-07-20 22:57:39,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 22:57:39,516 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-07-20 22:57:39,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:39,518 INFO L225 Difference]: With dead ends: 140 [2020-07-20 22:57:39,518 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 22:57:39,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2020-07-20 22:57:39,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 22:57:39,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-20 22:57:39,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 22:57:39,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2020-07-20 22:57:39,530 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 69 [2020-07-20 22:57:39,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:39,531 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2020-07-20 22:57:39,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 22:57:39,531 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2020-07-20 22:57:39,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 22:57:39,532 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:39,532 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 22:57:39,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:39,734 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:39,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:39,734 INFO L82 PathProgramCache]: Analyzing trace with hash 728435349, now seen corresponding path program 6 times [2020-07-20 22:57:39,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:39,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288375088] [2020-07-20 22:57:39,735 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:57:39,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:57:39,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:39,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 22:57:39,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:39,877 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 22:57:39,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:39,983 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 22:57:39,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288375088] [2020-07-20 22:57:39,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:39,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-20 22:57:39,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721165849] [2020-07-20 22:57:39,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 22:57:39,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:39,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 22:57:39,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-20 22:57:39,986 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand 13 states. [2020-07-20 22:57:40,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:40,210 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-20 22:57:40,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 22:57:40,213 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-07-20 22:57:40,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:40,218 INFO L225 Difference]: With dead ends: 148 [2020-07-20 22:57:40,218 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 22:57:40,219 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 22:57:40,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 22:57:40,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-20 22:57:40,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 22:57:40,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 139 transitions. [2020-07-20 22:57:40,235 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 139 transitions. Word has length 77 [2020-07-20 22:57:40,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:40,237 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 139 transitions. [2020-07-20 22:57:40,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 22:57:40,237 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 139 transitions. [2020-07-20 22:57:40,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 22:57:40,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:40,239 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 22:57:40,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:40,453 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:40,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:40,454 INFO L82 PathProgramCache]: Analyzing trace with hash -323556203, now seen corresponding path program 7 times [2020-07-20 22:57:40,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:40,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527347661] [2020-07-20 22:57:40,455 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 22:57:40,484 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:57:40,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:40,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 22:57:40,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:40,554 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 22:57:40,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:40,668 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 22:57:40,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527347661] [2020-07-20 22:57:40,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:40,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 22:57:40,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878061736] [2020-07-20 22:57:40,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 22:57:40,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:40,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 22:57:40,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:57:40,673 INFO L87 Difference]: Start difference. First operand 116 states and 139 transitions. Second operand 12 states. [2020-07-20 22:57:41,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:57:41,053 INFO L93 Difference]: Finished difference Result 138 states and 162 transitions. [2020-07-20 22:57:41,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 22:57:41,055 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2020-07-20 22:57:41,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:57:41,057 INFO L225 Difference]: With dead ends: 138 [2020-07-20 22:57:41,057 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 22:57:41,058 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 22:57:41,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 22:57:41,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-20 22:57:41,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 22:57:41,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 137 transitions. [2020-07-20 22:57:41,076 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 137 transitions. Word has length 77 [2020-07-20 22:57:41,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:57:41,077 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 137 transitions. [2020-07-20 22:57:41,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 22:57:41,077 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 137 transitions. [2020-07-20 22:57:41,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 22:57:41,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:57:41,079 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 22:57:41,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:57:41,293 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:57:41,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:57:41,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1534824776, now seen corresponding path program 8 times [2020-07-20 22:57:41,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:57:41,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918922366] [2020-07-20 22:57:41,295 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 22:57:41,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:57:41,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:57:41,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 22:57:41,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:57:42,167 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 22:57:42,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:57:42,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:57:44,549 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 22:57:44,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918922366] [2020-07-20 22:57:44,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:57:44,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 22:57:44,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050049433] [2020-07-20 22:57:44,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 22:57:44,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:57:44,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 22:57:44,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2020-07-20 22:57:44,552 INFO L87 Difference]: Start difference. First operand 116 states and 137 transitions. Second operand 22 states. [2020-07-20 22:57:55,197 WARN L193 SmtUtils]: Spent 456.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 22:57:57,788 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 22:58:00,410 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 22:58:01,526 WARN L193 SmtUtils]: Spent 722.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-07-20 22:58:03,962 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ (* 2 c_main_~y2~0) (* 3 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 1)) (= (+ c_main_~x1~0 3) (+ 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 22:58:07,049 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 22:58:19,261 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 22:58:32,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:58:32,070 INFO L93 Difference]: Finished difference Result 236 states and 280 transitions. [2020-07-20 22:58:32,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 22:58:32,073 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 85 [2020-07-20 22:58:32,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:58:32,075 INFO L225 Difference]: With dead ends: 236 [2020-07-20 22:58:32,075 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 22:58:32,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 22.5s TimeCoverageRelationStatistics Valid=122, Invalid=1001, Unknown=3, NotChecked=64, Total=1190 [2020-07-20 22:58:32,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 22:58:32,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2020-07-20 22:58:32,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 22:58:32,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 237 transitions. [2020-07-20 22:58:32,097 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 237 transitions. Word has length 85 [2020-07-20 22:58:32,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:58:32,097 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 237 transitions. [2020-07-20 22:58:32,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 22:58:32,098 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 237 transitions. [2020-07-20 22:58:32,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 22:58:32,099 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:58:32,099 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 22:58:32,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:58:32,300 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:58:32,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:58:32,300 INFO L82 PathProgramCache]: Analyzing trace with hash -2106989411, now seen corresponding path program 9 times [2020-07-20 22:58:32,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:58:32,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006243003] [2020-07-20 22:58:32,301 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 22:58:32,342 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:58:32,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:58:32,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 22:58:32,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:58:33,362 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 22:58:33,775 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 22:58:34,237 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 22:58:35,183 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 22:58:35,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:58:35,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:58:36,554 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-20 22:58:44,992 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 22:58:44,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006243003] [2020-07-20 22:58:44,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:58:44,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-20 22:58:44,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145435651] [2020-07-20 22:58:44,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 22:58:44,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:58:44,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 22:58:44,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:58:44,995 INFO L87 Difference]: Start difference. First operand 200 states and 237 transitions. Second operand 24 states. [2020-07-20 22:58:47,191 WARN L193 SmtUtils]: Spent 746.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-20 22:58:48,655 WARN L193 SmtUtils]: Spent 893.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 22:58:49,812 WARN L193 SmtUtils]: Spent 537.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 22:58:54,003 WARN L193 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 22:58:55,673 WARN L193 SmtUtils]: Spent 820.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 22:58:57,162 WARN L193 SmtUtils]: Spent 509.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 22:59:00,800 WARN L193 SmtUtils]: Spent 2.61 s on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 22:59:03,940 WARN L193 SmtUtils]: Spent 1.80 s on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 22:59:06,143 WARN L193 SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 22:59:06,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:06,323 INFO L93 Difference]: Finished difference Result 224 states and 258 transitions. [2020-07-20 22:59:06,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 22:59:06,331 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2020-07-20 22:59:06,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:06,332 INFO L225 Difference]: With dead ends: 224 [2020-07-20 22:59:06,332 INFO L226 Difference]: Without dead ends: 166 [2020-07-20 22:59:06,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 22:59:06,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-20 22:59:06,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2020-07-20 22:59:06,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 22:59:06,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 193 transitions. [2020-07-20 22:59:06,351 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 193 transitions. Word has length 93 [2020-07-20 22:59:06,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:06,352 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 193 transitions. [2020-07-20 22:59:06,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 22:59:06,352 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 193 transitions. [2020-07-20 22:59:06,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 22:59:06,353 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:06,353 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 22:59:06,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:06,567 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:06,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:06,568 INFO L82 PathProgramCache]: Analyzing trace with hash -178978853, now seen corresponding path program 10 times [2020-07-20 22:59:06,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:06,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6758327] [2020-07-20 22:59:06,569 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 22:59:06,610 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:59:06,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:06,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 22:59:06,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:06,730 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 22:59:06,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:59:06,875 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 22:59:06,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6758327] [2020-07-20 22:59:06,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:59:06,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-20 22:59:06,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466852481] [2020-07-20 22:59:06,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 22:59:06,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:06,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 22:59:06,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-07-20 22:59:06,877 INFO L87 Difference]: Start difference. First operand 166 states and 193 transitions. Second operand 15 states. [2020-07-20 22:59:07,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:07,674 INFO L93 Difference]: Finished difference Result 220 states and 261 transitions. [2020-07-20 22:59:07,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 22:59:07,678 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-07-20 22:59:07,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:07,680 INFO L225 Difference]: With dead ends: 220 [2020-07-20 22:59:07,680 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 22:59:07,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2020-07-20 22:59:07,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 22:59:07,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2020-07-20 22:59:07,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-20 22:59:07,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 230 transitions. [2020-07-20 22:59:07,699 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 230 transitions. Word has length 93 [2020-07-20 22:59:07,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:07,699 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 230 transitions. [2020-07-20 22:59:07,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 22:59:07,699 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 230 transitions. [2020-07-20 22:59:07,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 22:59:07,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:07,701 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 22:59:07,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:07,905 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:07,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:07,906 INFO L82 PathProgramCache]: Analyzing trace with hash -837428226, now seen corresponding path program 11 times [2020-07-20 22:59:07,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:07,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985991758] [2020-07-20 22:59:07,907 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 22:59:07,949 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:59:07,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:07,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 22:59:07,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:08,716 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 22:59:09,051 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 22:59:09,418 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 22:59:09,823 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 22:59:10,439 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 22:59:11,025 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 22:59:11,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:59:11,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:59:24,274 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 22:59:24,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1985991758] [2020-07-20 22:59:24,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:59:24,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-20 22:59:24,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202332475] [2020-07-20 22:59:24,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 22:59:24,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:24,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 22:59:24,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=583, Unknown=0, NotChecked=0, Total=650 [2020-07-20 22:59:24,277 INFO L87 Difference]: Start difference. First operand 194 states and 230 transitions. Second operand 26 states. [2020-07-20 22:59:42,336 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 22:59:43,644 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 22:59:44,628 WARN L193 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 22:59:58,230 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 23:00:03,620 WARN L193 SmtUtils]: Spent 392.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 23:00:38,601 WARN L193 SmtUtils]: Spent 6.09 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 23:00:53,279 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 3) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ (* 2 c_main_~y2~0) (* 3 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 2)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-20 23:00:58,575 WARN L193 SmtUtils]: Spent 661.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 23:01:07,146 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 23:01:22,715 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 23:01:44,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:01:44,276 INFO L93 Difference]: Finished difference Result 340 states and 402 transitions. [2020-07-20 23:01:44,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 23:01:44,284 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 101 [2020-07-20 23:01:44,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:01:44,286 INFO L225 Difference]: With dead ends: 340 [2020-07-20 23:01:44,287 INFO L226 Difference]: Without dead ends: 302 [2020-07-20 23:01:44,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 90.0s TimeCoverageRelationStatistics Valid=151, Invalid=1481, Unknown=12, NotChecked=78, Total=1722 [2020-07-20 23:01:44,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2020-07-20 23:01:44,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2020-07-20 23:01:44,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-20 23:01:44,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 356 transitions. [2020-07-20 23:01:44,318 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 356 transitions. Word has length 101 [2020-07-20 23:01:44,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:01:44,319 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 356 transitions. [2020-07-20 23:01:44,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 23:01:44,319 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 356 transitions. [2020-07-20 23:01:44,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 23:01:44,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:01:44,321 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 23:01:44,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:01:44,522 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:01:44,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:01:44,523 INFO L82 PathProgramCache]: Analyzing trace with hash -1126316255, now seen corresponding path program 12 times [2020-07-20 23:01:44,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:01:44,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273074906] [2020-07-20 23:01:44,524 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 23:01:44,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:01:44,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:01:44,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 23:01:44,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:01:44,693 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 23:01:44,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 23:01:44,920 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 23:01:44,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273074906] [2020-07-20 23:01:44,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 23:01:44,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2020-07-20 23:01:44,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653393109] [2020-07-20 23:01:44,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 23:01:44,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:01:44,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 23:01:44,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2020-07-20 23:01:44,922 INFO L87 Difference]: Start difference. First operand 302 states and 356 transitions. Second operand 18 states. [2020-07-20 23:01:47,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:01:47,852 INFO L93 Difference]: Finished difference Result 368 states and 440 transitions. [2020-07-20 23:01:47,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 23:01:47,858 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2020-07-20 23:01:47,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:01:47,861 INFO L225 Difference]: With dead ends: 368 [2020-07-20 23:01:47,861 INFO L226 Difference]: Without dead ends: 338 [2020-07-20 23:01:47,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2020-07-20 23:01:47,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-20 23:01:47,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 338. [2020-07-20 23:01:47,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2020-07-20 23:01:47,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 404 transitions. [2020-07-20 23:01:47,890 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 404 transitions. Word has length 109 [2020-07-20 23:01:47,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:01:47,890 INFO L479 AbstractCegarLoop]: Abstraction has 338 states and 404 transitions. [2020-07-20 23:01:47,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 23:01:47,890 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 404 transitions. [2020-07-20 23:01:47,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 23:01:47,892 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:01:47,892 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 23:01:48,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:01:48,107 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:01:48,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:01:48,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1251867972, now seen corresponding path program 13 times [2020-07-20 23:01:48,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:01:48,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233204818] [2020-07-20 23:01:48,109 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 23:01:48,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:01:48,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:01:48,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 23:01:48,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:01:49,627 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:01:50,152 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:01:50,736 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:01:51,368 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:01:52,056 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:01:53,086 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 23:01:54,117 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 23:01:54,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 23:01:55,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 23:02:19,284 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 23:02:19,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233204818] [2020-07-20 23:02:19,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 23:02:19,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-20 23:02:19,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910868798] [2020-07-20 23:02:19,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 23:02:19,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:02:19,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 23:02:19,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2020-07-20 23:02:19,287 INFO L87 Difference]: Start difference. First operand 338 states and 404 transitions. Second operand 30 states. [2020-07-20 23:02:51,240 WARN L193 SmtUtils]: Spent 5.54 s on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 23:03:23,190 WARN L193 SmtUtils]: Spent 989.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 23:03:49,212 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 23:04:24,558 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 23:04:47,386 WARN L193 SmtUtils]: Spent 423.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 23:05:31,382 WARN L193 SmtUtils]: Spent 2.80 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 23:05:39,247 WARN L193 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 23:05:42,166 WARN L193 SmtUtils]: Spent 521.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 23:05:44,603 WARN L193 SmtUtils]: Spent 615.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 23:06:00,656 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 23:06:17,726 WARN L193 SmtUtils]: Spent 522.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 23:06:34,648 WARN L193 SmtUtils]: Spent 762.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 23:06:45,871 WARN L193 SmtUtils]: Spent 747.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 23:07:39,762 WARN L193 SmtUtils]: Spent 6.84 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 23:07:54,851 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 23:08:15,571 WARN L193 SmtUtils]: Spent 927.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 23:08:36,248 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 23:08:54,190 WARN L193 SmtUtils]: Spent 1.21 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 23:09:08,358 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 23:09:23,239 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 23:09:35,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:09:35,826 INFO L93 Difference]: Finished difference Result 512 states and 613 transitions. [2020-07-20 23:09:35,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 23:09:35,836 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 117 [2020-07-20 23:09:35,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:09:35,839 INFO L225 Difference]: With dead ends: 512 [2020-07-20 23:09:35,839 INFO L226 Difference]: Without dead ends: 470 [2020-07-20 23:09:35,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 263.1s TimeCoverageRelationStatistics Valid=205, Invalid=2634, Unknown=23, NotChecked=0, Total=2862 [2020-07-20 23:09:35,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-20 23:09:35,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 470. [2020-07-20 23:09:35,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470 states. [2020-07-20 23:09:35,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 562 transitions. [2020-07-20 23:09:35,906 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 562 transitions. Word has length 117 [2020-07-20 23:09:35,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:09:35,906 INFO L479 AbstractCegarLoop]: Abstraction has 470 states and 562 transitions. [2020-07-20 23:09:35,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 23:09:35,907 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 562 transitions. [2020-07-20 23:09:35,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 23:09:35,908 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:09:35,909 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 10, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:09:36,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:09:36,123 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:09:36,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:09:36,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1353613609, now seen corresponding path program 14 times [2020-07-20 23:09:36,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:09:36,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880802287] [2020-07-20 23:09:36,124 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:09:36,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:09:36,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:09:36,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 23:09:36,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:09:36,295 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 172 proven. 168 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 23:09:36,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 23:09:36,510 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 92 proven. 248 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 23:09:36,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880802287] [2020-07-20 23:09:36,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 23:09:36,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-20 23:09:36,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41292476] [2020-07-20 23:09:36,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 23:09:36,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:09:36,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 23:09:36,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-20 23:09:36,512 INFO L87 Difference]: Start difference. First operand 470 states and 562 transitions. Second operand 17 states. [2020-07-20 23:09:38,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:09:38,101 INFO L93 Difference]: Finished difference Result 532 states and 639 transitions. [2020-07-20 23:09:38,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 23:09:38,110 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 125 [2020-07-20 23:09:38,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:09:38,113 INFO L225 Difference]: With dead ends: 532 [2020-07-20 23:09:38,113 INFO L226 Difference]: Without dead ends: 454 [2020-07-20 23:09:38,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 229 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=301, Unknown=0, NotChecked=0, Total=420 [2020-07-20 23:09:38,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-07-20 23:09:38,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 452. [2020-07-20 23:09:38,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2020-07-20 23:09:38,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 533 transitions. [2020-07-20 23:09:38,148 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 533 transitions. Word has length 125 [2020-07-20 23:09:38,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:09:38,148 INFO L479 AbstractCegarLoop]: Abstraction has 452 states and 533 transitions. [2020-07-20 23:09:38,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 23:09:38,148 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 533 transitions. [2020-07-20 23:09:38,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 23:09:38,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:09:38,151 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:09:38,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:09:38,364 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:09:38,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:09:38,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1050066329, now seen corresponding path program 15 times [2020-07-20 23:09:38,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:09:38,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390099047] [2020-07-20 23:09:38,365 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:09:38,403 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:09:38,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:09:38,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 23:09:38,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:09:38,611 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-20 23:09:38,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 23:09:38,940 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-20 23:09:38,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390099047] [2020-07-20 23:09:38,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 23:09:38,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2020-07-20 23:09:38,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397393576] [2020-07-20 23:09:38,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 23:09:38,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:09:38,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 23:09:38,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-07-20 23:09:38,942 INFO L87 Difference]: Start difference. First operand 452 states and 533 transitions. Second operand 21 states. [2020-07-20 23:09:44,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:09:44,906 INFO L93 Difference]: Finished difference Result 526 states and 627 transitions. [2020-07-20 23:09:44,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 23:09:44,917 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 125 [2020-07-20 23:09:44,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:09:44,920 INFO L225 Difference]: With dead ends: 526 [2020-07-20 23:09:44,920 INFO L226 Difference]: Without dead ends: 492 [2020-07-20 23:09:44,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=329, Invalid=1153, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 23:09:44,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2020-07-20 23:09:44,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 492. [2020-07-20 23:09:44,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 492 states. [2020-07-20 23:09:44,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 586 transitions. [2020-07-20 23:09:44,970 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 586 transitions. Word has length 125 [2020-07-20 23:09:44,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:09:44,970 INFO L479 AbstractCegarLoop]: Abstraction has 492 states and 586 transitions. [2020-07-20 23:09:44,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 23:09:44,970 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 586 transitions. [2020-07-20 23:09:44,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 23:09:44,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:09:44,972 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:09:45,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:09:45,185 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:09:45,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:09:45,187 INFO L82 PathProgramCache]: Analyzing trace with hash 3461770, now seen corresponding path program 16 times [2020-07-20 23:09:45,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:09:45,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623341721] [2020-07-20 23:09:45,188 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:09:45,274 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:09:45,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:09:45,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 23:09:45,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:09:45,522 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 23:09:45,790 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 23:09:46,123 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 23:09:46,478 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 23:09:46,880 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 23:09:47,368 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 23:09:48,294 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:09:49,296 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:09:50,393 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:09:51,653 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:09:52,918 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:09:54,338 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 23:09:56,433 WARN L193 SmtUtils]: Spent 501.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 23:09:58,526 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 23:09:58,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 23:10:00,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 23:10:20,109 WARN L193 SmtUtils]: Spent 460.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-20 23:11:01,119 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 23:11:01,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623341721] [2020-07-20 23:11:01,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 23:11:01,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 34 [2020-07-20 23:11:01,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611133970] [2020-07-20 23:11:01,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 23:11:01,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:01,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 23:11:01,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1032, Unknown=1, NotChecked=0, Total=1122 [2020-07-20 23:11:01,122 INFO L87 Difference]: Start difference. First operand 492 states and 586 transitions. Second operand 34 states. [2020-07-20 23:11:16,454 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 13