/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 NOT_INCREMENTALLY -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 12:21:57,557 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:21:57,561 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:21:57,583 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:21:57,583 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:21:57,586 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:21:57,588 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:21:57,601 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:21:57,604 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:21:57,604 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:21:57,606 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:21:57,609 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:21:57,609 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:21:57,613 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:21:57,615 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:21:57,618 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:21:57,619 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:21:57,621 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:21:57,623 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:21:57,629 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:21:57,635 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:21:57,636 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:21:57,638 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:21:57,639 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:21:57,641 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 12:21:57,657 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:21:57,658 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:21:57,661 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:21:57,662 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 12:21:57,685 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:21:57,685 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:21:57,686 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:21:57,688 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:21:57,689 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:21:57,689 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:21:57,689 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:21:57,689 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:21:57,689 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:21:57,690 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:21:57,691 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:21:57,691 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:21:57,691 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:21:57,692 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:21:57,692 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:21:57,692 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:21:57,692 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:21:57,692 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:21:57,693 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:21:57,693 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:21:57,693 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:21:57,693 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:21:57,693 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:21:57,694 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:21:57,694 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:21:57,694 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:21:57,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:21:57,694 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:21:57,694 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:21:57,695 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 -> NOT_INCREMENTALLY [2020-07-20 12:21:57,982 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:21:57,996 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:21:57,999 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:21:58,001 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:21:58,001 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:21:58,002 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 12:21:58,079 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c025afaf9/84614f2e17cb4393a470129ef48c3369/FLAGa05244d56 [2020-07-20 12:21:58,531 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:21:58,532 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 12:21:58,537 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c025afaf9/84614f2e17cb4393a470129ef48c3369/FLAGa05244d56 [2020-07-20 12:21:58,930 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c025afaf9/84614f2e17cb4393a470129ef48c3369 [2020-07-20 12:21:58,937 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:21:58,940 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:21:58,941 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:21:58,942 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:21:58,946 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:21:58,948 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:21:58" (1/1) ... [2020-07-20 12:21:58,951 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@573ed03d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:58, skipping insertion in model container [2020-07-20 12:21:58,952 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:21:58" (1/1) ... [2020-07-20 12:21:58,960 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:21:58,979 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:21:59,201 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:21:59,205 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:21:59,225 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:21:59,240 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:21:59,241 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59 WrapperNode [2020-07-20 12:21:59,241 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:21:59,242 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:21:59,242 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:21:59,242 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:21:59,256 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (1/1) ... [2020-07-20 12:21:59,256 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (1/1) ... [2020-07-20 12:21:59,262 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (1/1) ... [2020-07-20 12:21:59,263 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (1/1) ... [2020-07-20 12:21:59,267 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (1/1) ... [2020-07-20 12:21:59,345 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (1/1) ... [2020-07-20 12:21:59,346 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (1/1) ... [2020-07-20 12:21:59,348 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:21:59,354 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:21:59,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:21:59,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:21:59,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (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 12:21:59,422 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:21:59,422 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:21:59,422 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:21:59,422 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 12:21:59,423 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:21:59,423 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:21:59,423 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 12:21:59,423 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:21:59,423 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:21:59,423 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 12:21:59,423 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:21:59,424 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:21:59,424 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:21:59,615 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:21:59,616 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 12:21:59,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:21:59 BoogieIcfgContainer [2020-07-20 12:21:59,620 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:21:59,621 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:21:59,622 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:21:59,625 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:21:59,625 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:21:58" (1/3) ... [2020-07-20 12:21:59,626 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4933aff4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:21:59, skipping insertion in model container [2020-07-20 12:21:59,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:21:59" (2/3) ... [2020-07-20 12:21:59,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4933aff4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:21:59, skipping insertion in model container [2020-07-20 12:21:59,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:21:59" (3/3) ... [2020-07-20 12:21:59,629 INFO L109 eAbstractionObserver]: Analyzing ICFG mannadiv.c [2020-07-20 12:21:59,640 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:21:59,648 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:21:59,676 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:21:59,710 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:21:59,711 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:21:59,711 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:21:59,711 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:21:59,711 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:21:59,711 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:21:59,711 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:21:59,712 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:21:59,736 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 12:21:59,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 12:21:59,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:21:59,745 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 12:21:59,746 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:21:59,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:21:59,754 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-20 12:21:59,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:21:59,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [597049329] [2020-07-20 12:21:59,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:21:59,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:21:59,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 12:21:59,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:21:59,863 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 12:21:59,863 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:21:59,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [597049329] [2020-07-20 12:21:59,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:21:59,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 12:21:59,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408224928] [2020-07-20 12:21:59,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 12:21:59,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:21:59,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 12:21:59,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 12:21:59,889 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-20 12:21:59,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:21:59,916 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-20 12:21:59,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 12:21:59,918 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-20 12:21:59,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:21:59,928 INFO L225 Difference]: With dead ends: 50 [2020-07-20 12:21:59,928 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 12:21:59,932 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 12:21:59,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 12:21:59,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 12:21:59,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 12:21:59,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-20 12:21:59,975 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-20 12:21:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:21:59,976 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-20 12:21:59,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 12:21:59,977 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-20 12:21:59,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 12:21:59,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:21:59,979 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 12:22:00,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:00,194 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:00,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:00,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-20 12:22:00,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:00,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138727593] [2020-07-20 12:22:00,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:00,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:00,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 12:22:00,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:00,390 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 12:22:00,391 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:22:00,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138727593] [2020-07-20 12:22:00,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:22:00,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 12:22:00,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206379166] [2020-07-20 12:22:00,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:22:00,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:00,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:22:00,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 12:22:00,396 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 8 states. [2020-07-20 12:22:00,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:00,546 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 12:22:00,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 12:22:00,547 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-20 12:22:00,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:00,550 INFO L225 Difference]: With dead ends: 34 [2020-07-20 12:22:00,550 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 12:22:00,551 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 12:22:00,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 12:22:00,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-20 12:22:00,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 12:22:00,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 12:22:00,571 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-20 12:22:00,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:00,577 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 12:22:00,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:22:00,578 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 12:22:00,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 12:22:00,579 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:00,579 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 12:22:00,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:00,780 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:00,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:00,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-20 12:22:00,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:00,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837560799] [2020-07-20 12:22:00,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:00,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:00,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 12:22:00,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:00,897 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 12:22:00,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:00,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:01,005 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 12:22:01,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:01,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:01,054 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 12:22:01,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837560799] [2020-07-20 12:22:01,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:01,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-20 12:22:01,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376362943] [2020-07-20 12:22:01,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 12:22:01,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:01,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 12:22:01,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-20 12:22:01,058 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2020-07-20 12:22:03,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:03,224 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-07-20 12:22:03,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 12:22:03,225 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 12:22:03,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:03,227 INFO L225 Difference]: With dead ends: 37 [2020-07-20 12:22:03,228 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 12:22:03,229 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 12:22:03,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 12:22:03,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-07-20 12:22:03,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 12:22:03,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 12:22:03,237 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-20 12:22:03,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:03,237 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 12:22:03,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 12:22:03,238 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 12:22:03,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 12:22:03,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:03,239 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 12:22:03,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:03,453 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:03,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:03,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-20 12:22:03,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:03,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081307530] [2020-07-20 12:22:03,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:03,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:03,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 12:22:03,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:03,551 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 12:22:03,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:03,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:03,655 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 12:22:03,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081307530] [2020-07-20 12:22:03,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:03,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 12:22:03,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390532752] [2020-07-20 12:22:03,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:22:03,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:03,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:22:03,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 12:22:03,658 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-07-20 12:22:08,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:08,464 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-07-20 12:22:08,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 12:22:08,468 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 12:22:08,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:08,469 INFO L225 Difference]: With dead ends: 72 [2020-07-20 12:22:08,470 INFO L226 Difference]: Without dead ends: 56 [2020-07-20 12:22:08,470 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 12:22:08,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-20 12:22:08,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-20 12:22:08,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 12:22:08,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2020-07-20 12:22:08,487 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 29 [2020-07-20 12:22:08,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:08,488 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2020-07-20 12:22:08,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:22:08,488 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2020-07-20 12:22:08,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 12:22:08,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:08,490 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 12:22:08,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:08,694 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:08,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:08,694 INFO L82 PathProgramCache]: Analyzing trace with hash 802873865, now seen corresponding path program 1 times [2020-07-20 12:22:08,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:08,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892031759] [2020-07-20 12:22:08,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:08,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:08,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:22:08,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:08,766 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 12:22:08,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:08,826 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 12:22:08,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892031759] [2020-07-20 12:22:08,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:08,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-20 12:22:08,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126120156] [2020-07-20 12:22:08,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 12:22:08,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:08,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 12:22:08,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 12:22:08,829 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand 6 states. [2020-07-20 12:22:08,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:08,903 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-20 12:22:08,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 12:22:08,907 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-20 12:22:08,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:08,909 INFO L225 Difference]: With dead ends: 86 [2020-07-20 12:22:08,909 INFO L226 Difference]: Without dead ends: 70 [2020-07-20 12:22:08,910 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 12:22:08,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-20 12:22:08,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-20 12:22:08,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 12:22:08,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2020-07-20 12:22:08,928 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 45 [2020-07-20 12:22:08,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:08,928 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2020-07-20 12:22:08,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 12:22:08,928 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2020-07-20 12:22:08,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 12:22:08,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:08,930 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 12:22:09,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:09,145 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:09,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:09,146 INFO L82 PathProgramCache]: Analyzing trace with hash -208243385, now seen corresponding path program 2 times [2020-07-20 12:22:09,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:09,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514550731] [2020-07-20 12:22:09,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:09,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:09,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 12:22:09,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:09,325 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 12:22:09,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:09,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:09,524 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 12:22:09,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514550731] [2020-07-20 12:22:09,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:09,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 12:22:09,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84966513] [2020-07-20 12:22:09,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 12:22:09,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:09,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 12:22:09,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:22:09,534 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 12 states. [2020-07-20 12:22:20,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:20,444 INFO L93 Difference]: Finished difference Result 124 states and 150 transitions. [2020-07-20 12:22:20,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 12:22:20,477 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-07-20 12:22:20,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:20,478 INFO L225 Difference]: With dead ends: 124 [2020-07-20 12:22:20,479 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 12:22:20,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-20 12:22:20,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 12:22:20,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 112. [2020-07-20 12:22:20,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 12:22:20,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 136 transitions. [2020-07-20 12:22:20,501 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 136 transitions. Word has length 45 [2020-07-20 12:22:20,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:20,502 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 136 transitions. [2020-07-20 12:22:20,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 12:22:20,502 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 136 transitions. [2020-07-20 12:22:20,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 12:22:20,504 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:20,504 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 12:22:20,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:20,708 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:20,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:20,709 INFO L82 PathProgramCache]: Analyzing trace with hash -53426768, now seen corresponding path program 2 times [2020-07-20 12:22:20,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:20,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845662048] [2020-07-20 12:22:20,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:20,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:20,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 12:22:20,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:21,031 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 12:22:21,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:21,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:21,439 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 12:22:21,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845662048] [2020-07-20 12:22:21,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:21,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 12:22:21,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039086922] [2020-07-20 12:22:21,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 12:22:21,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:21,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 12:22:21,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2020-07-20 12:22:21,442 INFO L87 Difference]: Start difference. First operand 112 states and 136 transitions. Second operand 14 states. [2020-07-20 12:22:21,865 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-20 12:22:22,071 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 12:22:24,644 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 12:22:25,058 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-20 12:22:25,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:25,123 INFO L93 Difference]: Finished difference Result 156 states and 183 transitions. [2020-07-20 12:22:25,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 12:22:25,127 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-07-20 12:22:25,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:25,128 INFO L225 Difference]: With dead ends: 156 [2020-07-20 12:22:25,128 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 12:22:25,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-20 12:22:25,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 12:22:25,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-20 12:22:25,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 12:22:25,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 115 transitions. [2020-07-20 12:22:25,157 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 115 transitions. Word has length 53 [2020-07-20 12:22:25,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:25,157 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 115 transitions. [2020-07-20 12:22:25,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 12:22:25,157 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 115 transitions. [2020-07-20 12:22:25,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 12:22:25,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:25,159 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 12:22:25,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:25,375 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:25,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:25,376 INFO L82 PathProgramCache]: Analyzing trace with hash 10333007, now seen corresponding path program 3 times [2020-07-20 12:22:25,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:25,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164782801] [2020-07-20 12:22:25,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:25,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:25,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 12:22:25,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:25,495 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 12:22:25,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:25,578 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 12:22:25,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164782801] [2020-07-20 12:22:25,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:25,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 12:22:25,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028611532] [2020-07-20 12:22:25,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 12:22:25,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:25,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 12:22:25,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-20 12:22:25,584 INFO L87 Difference]: Start difference. First operand 98 states and 115 transitions. Second operand 10 states. [2020-07-20 12:22:25,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:25,719 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-20 12:22:25,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 12:22:25,724 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 61 [2020-07-20 12:22:25,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:25,730 INFO L225 Difference]: With dead ends: 148 [2020-07-20 12:22:25,730 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 12:22:25,731 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 12:22:25,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 12:22:25,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-20 12:22:25,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 12:22:25,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 138 transitions. [2020-07-20 12:22:25,769 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 138 transitions. Word has length 61 [2020-07-20 12:22:25,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:25,770 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 138 transitions. [2020-07-20 12:22:25,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 12:22:25,770 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 138 transitions. [2020-07-20 12:22:25,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 12:22:25,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:25,774 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 12:22:25,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:25,975 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:25,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:25,976 INFO L82 PathProgramCache]: Analyzing trace with hash -185889457, now seen corresponding path program 4 times [2020-07-20 12:22:25,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:25,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703870194] [2020-07-20 12:22:25,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:26,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:26,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 12:22:26,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:26,074 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 12:22:26,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:26,146 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 12:22:26,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703870194] [2020-07-20 12:22:26,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:26,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 12:22:26,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635790214] [2020-07-20 12:22:26,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 12:22:26,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:26,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 12:22:26,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 12:22:26,149 INFO L87 Difference]: Start difference. First operand 116 states and 138 transitions. Second operand 9 states. [2020-07-20 12:22:26,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:26,364 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2020-07-20 12:22:26,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 12:22:26,367 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-07-20 12:22:26,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:26,369 INFO L225 Difference]: With dead ends: 134 [2020-07-20 12:22:26,369 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 12:22:26,370 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 12:22:26,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 12:22:26,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-20 12:22:26,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 12:22:26,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 135 transitions. [2020-07-20 12:22:26,386 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 135 transitions. Word has length 61 [2020-07-20 12:22:26,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:26,387 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 135 transitions. [2020-07-20 12:22:26,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 12:22:26,387 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 135 transitions. [2020-07-20 12:22:26,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 12:22:26,388 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:26,389 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 12:22:26,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:26,603 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:26,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:26,604 INFO L82 PathProgramCache]: Analyzing trace with hash -377856460, now seen corresponding path program 5 times [2020-07-20 12:22:26,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:26,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328728466] [2020-07-20 12:22:26,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:26,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:26,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 12:22:26,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:27,226 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 12:22:27,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:27,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:28,412 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 12:22:28,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328728466] [2020-07-20 12:22:28,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:28,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-20 12:22:28,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591869754] [2020-07-20 12:22:28,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 12:22:28,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:28,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 12:22:28,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-07-20 12:22:28,415 INFO L87 Difference]: Start difference. First operand 116 states and 135 transitions. Second operand 18 states. [2020-07-20 12:22:28,886 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 12:22:29,362 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 12:22:29,979 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 12:22:30,275 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 12:22:32,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:32,827 INFO L93 Difference]: Finished difference Result 140 states and 156 transitions. [2020-07-20 12:22:32,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 12:22:32,828 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-07-20 12:22:32,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:32,831 INFO L225 Difference]: With dead ends: 140 [2020-07-20 12:22:32,831 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 12:22:32,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2020-07-20 12:22:32,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 12:22:32,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-20 12:22:32,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 12:22:32,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2020-07-20 12:22:32,849 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 69 [2020-07-20 12:22:32,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:32,850 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2020-07-20 12:22:32,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 12:22:32,850 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2020-07-20 12:22:32,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 12:22:32,852 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:32,852 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 12:22:33,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:33,066 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:33,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:33,067 INFO L82 PathProgramCache]: Analyzing trace with hash 728435349, now seen corresponding path program 6 times [2020-07-20 12:22:33,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:33,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920886598] [2020-07-20 12:22:33,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:33,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:33,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 12:22:33,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:33,211 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 12:22:33,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:33,355 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 12:22:33,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920886598] [2020-07-20 12:22:33,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:33,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-20 12:22:33,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115652392] [2020-07-20 12:22:33,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 12:22:33,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:33,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 12:22:33,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-20 12:22:33,362 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand 13 states. [2020-07-20 12:22:33,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:33,571 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-20 12:22:33,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 12:22:33,573 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-07-20 12:22:33,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:33,575 INFO L225 Difference]: With dead ends: 148 [2020-07-20 12:22:33,575 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 12:22:33,579 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 12:22:33,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 12:22:33,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-20 12:22:33,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 12:22:33,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 139 transitions. [2020-07-20 12:22:33,594 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 139 transitions. Word has length 77 [2020-07-20 12:22:33,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:33,596 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 139 transitions. [2020-07-20 12:22:33,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 12:22:33,596 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 139 transitions. [2020-07-20 12:22:33,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 12:22:33,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:33,598 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 12:22:33,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:33,812 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:33,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:33,812 INFO L82 PathProgramCache]: Analyzing trace with hash -323556203, now seen corresponding path program 7 times [2020-07-20 12:22:33,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:33,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304852561] [2020-07-20 12:22:33,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:33,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:33,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 12:22:33,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:33,920 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 12:22:33,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:34,036 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 12:22:34,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304852561] [2020-07-20 12:22:34,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:34,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 12:22:34,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177478174] [2020-07-20 12:22:34,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 12:22:34,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:34,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 12:22:34,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:22:34,039 INFO L87 Difference]: Start difference. First operand 116 states and 139 transitions. Second operand 12 states. [2020-07-20 12:22:34,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:34,386 INFO L93 Difference]: Finished difference Result 138 states and 162 transitions. [2020-07-20 12:22:34,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 12:22:34,388 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2020-07-20 12:22:34,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:34,390 INFO L225 Difference]: With dead ends: 138 [2020-07-20 12:22:34,390 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 12:22:34,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 139 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-20 12:22:34,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 12:22:34,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-20 12:22:34,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 12:22:34,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 137 transitions. [2020-07-20 12:22:34,403 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 137 transitions. Word has length 77 [2020-07-20 12:22:34,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:34,404 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 137 transitions. [2020-07-20 12:22:34,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 12:22:34,404 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 137 transitions. [2020-07-20 12:22:34,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 12:22:34,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:34,405 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 12:22:34,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:34,621 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:34,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:34,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1534824776, now seen corresponding path program 8 times [2020-07-20 12:22:34,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:34,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643167285] [2020-07-20 12:22:34,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:22:34,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:34,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 12:22:34,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:35,504 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 12:22:35,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:35,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:22:37,018 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 12:22:37,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643167285] [2020-07-20 12:22:37,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:22:37,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 12:22:37,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730639467] [2020-07-20 12:22:37,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 12:22:37,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:22:37,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 12:22:37,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2020-07-20 12:22:37,021 INFO L87 Difference]: Start difference. First operand 116 states and 137 transitions. Second operand 22 states. [2020-07-20 12:22:49,509 WARN L193 SmtUtils]: Spent 616.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 12:22:54,471 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 12:22:57,169 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 12:22:58,392 WARN L193 SmtUtils]: Spent 811.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-07-20 12:23:24,158 WARN L193 SmtUtils]: Spent 9.02 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 12:23:30,378 WARN L193 SmtUtils]: Spent 488.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 12:23:32,244 WARN L193 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 12:23:46,400 WARN L193 SmtUtils]: Spent 851.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:24:03,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:24:03,998 INFO L93 Difference]: Finished difference Result 236 states and 280 transitions. [2020-07-20 12:24:04,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 12:24:04,003 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 85 [2020-07-20 12:24:04,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:24:04,005 INFO L225 Difference]: With dead ends: 236 [2020-07-20 12:24:04,005 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 12:24:04,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 50.6s TimeCoverageRelationStatistics Valid=128, Invalid=1057, Unknown=5, NotChecked=0, Total=1190 [2020-07-20 12:24:04,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 12:24:04,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2020-07-20 12:24:04,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 12:24:04,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 237 transitions. [2020-07-20 12:24:04,046 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 237 transitions. Word has length 85 [2020-07-20 12:24:04,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:24:04,047 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 237 transitions. [2020-07-20 12:24:04,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 12:24:04,047 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 237 transitions. [2020-07-20 12:24:04,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 12:24:04,048 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:24:04,048 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 12:24:04,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:24:04,249 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:24:04,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:24:04,250 INFO L82 PathProgramCache]: Analyzing trace with hash -2106989411, now seen corresponding path program 9 times [2020-07-20 12:24:04,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:24:04,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670451768] [2020-07-20 12:24:04,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:24:04,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:24:04,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 12:24:04,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:24:04,521 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:24:04,693 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:24:04,948 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:05,241 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:05,688 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:06,191 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:06,750 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:07,223 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 12:24:07,894 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 12:24:07,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:24:08,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:24:17,248 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 12:24:17,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670451768] [2020-07-20 12:24:17,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:24:17,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-20 12:24:17,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018094494] [2020-07-20 12:24:17,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 12:24:17,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:24:17,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 12:24:17,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-07-20 12:24:17,250 INFO L87 Difference]: Start difference. First operand 200 states and 237 transitions. Second operand 24 states. [2020-07-20 12:24:20,187 WARN L193 SmtUtils]: Spent 1.39 s on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-20 12:24:21,776 WARN L193 SmtUtils]: Spent 908.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 12:24:22,809 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 12:24:27,055 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 12:24:28,791 WARN L193 SmtUtils]: Spent 726.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 12:24:30,348 WARN L193 SmtUtils]: Spent 447.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 12:24:34,219 WARN L193 SmtUtils]: Spent 2.84 s on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 12:24:36,174 WARN L193 SmtUtils]: Spent 683.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 12:24:37,987 WARN L193 SmtUtils]: Spent 548.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 12:24:38,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:24:38,181 INFO L93 Difference]: Finished difference Result 224 states and 258 transitions. [2020-07-20 12:24:38,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 12:24:38,194 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2020-07-20 12:24:38,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:24:38,196 INFO L225 Difference]: With dead ends: 224 [2020-07-20 12:24:38,196 INFO L226 Difference]: Without dead ends: 166 [2020-07-20 12:24:38,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 12:24:38,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-20 12:24:38,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2020-07-20 12:24:38,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 12:24:38,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 193 transitions. [2020-07-20 12:24:38,212 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 193 transitions. Word has length 93 [2020-07-20 12:24:38,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:24:38,213 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 193 transitions. [2020-07-20 12:24:38,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 12:24:38,213 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 193 transitions. [2020-07-20 12:24:38,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 12:24:38,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:24:38,214 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 12:24:38,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:24:38,419 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:24:38,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:24:38,420 INFO L82 PathProgramCache]: Analyzing trace with hash -178978853, now seen corresponding path program 10 times [2020-07-20 12:24:38,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:24:38,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680775257] [2020-07-20 12:24:38,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:24:38,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:24:38,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 12:24:38,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:24:38,555 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 12:24:38,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:24:38,697 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 12:24:38,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680775257] [2020-07-20 12:24:38,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:24:38,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-20 12:24:38,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148099153] [2020-07-20 12:24:38,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 12:24:38,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:24:38,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 12:24:38,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-07-20 12:24:38,698 INFO L87 Difference]: Start difference. First operand 166 states and 193 transitions. Second operand 15 states. [2020-07-20 12:24:39,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:24:39,905 INFO L93 Difference]: Finished difference Result 220 states and 261 transitions. [2020-07-20 12:24:39,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 12:24:39,910 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-07-20 12:24:39,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:24:39,911 INFO L225 Difference]: With dead ends: 220 [2020-07-20 12:24:39,912 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 12:24:39,912 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 12:24:39,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 12:24:39,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2020-07-20 12:24:39,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-20 12:24:39,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 230 transitions. [2020-07-20 12:24:39,940 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 230 transitions. Word has length 93 [2020-07-20 12:24:39,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:24:39,943 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 230 transitions. [2020-07-20 12:24:39,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 12:24:39,943 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 230 transitions. [2020-07-20 12:24:39,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 12:24:39,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:24:39,947 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 12:24:40,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:24:40,151 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:24:40,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:24:40,152 INFO L82 PathProgramCache]: Analyzing trace with hash -837428226, now seen corresponding path program 11 times [2020-07-20 12:24:40,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:24:40,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272981203] [2020-07-20 12:24:40,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:24:40,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:24:40,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 12:24:40,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:24:40,437 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:24:40,624 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:24:40,835 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:24:41,068 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:24:41,402 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:41,779 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:42,199 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:42,664 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:24:43,369 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 12:24:44,048 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 12:24:44,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:24:44,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:24:57,720 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 12:24:57,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272981203] [2020-07-20 12:24:57,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:24:57,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-20 12:24:57,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102065144] [2020-07-20 12:24:57,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 12:24:57,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:24:57,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 12:24:57,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=583, Unknown=0, NotChecked=0, Total=650 [2020-07-20 12:24:57,721 INFO L87 Difference]: Start difference. First operand 194 states and 230 transitions. Second operand 26 states. [2020-07-20 12:25:07,185 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 12:25:17,523 WARN L193 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 12:25:19,019 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 12:25:20,151 WARN L193 SmtUtils]: Spent 414.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 12:25:29,498 WARN L193 SmtUtils]: Spent 524.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 12:25:35,547 WARN L193 SmtUtils]: Spent 506.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 12:26:04,618 WARN L193 SmtUtils]: Spent 6.93 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 12:26:16,234 WARN L193 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 12:26:23,267 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:26:44,093 WARN L193 SmtUtils]: Spent 923.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:26:57,084 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:27:20,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:27:20,036 INFO L93 Difference]: Finished difference Result 340 states and 402 transitions. [2020-07-20 12:27:20,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 12:27:20,047 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 101 [2020-07-20 12:27:20,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:27:20,049 INFO L225 Difference]: With dead ends: 340 [2020-07-20 12:27:20,050 INFO L226 Difference]: Without dead ends: 302 [2020-07-20 12:27:20,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 100.0s TimeCoverageRelationStatistics Valid=155, Invalid=1560, Unknown=7, NotChecked=0, Total=1722 [2020-07-20 12:27:20,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2020-07-20 12:27:20,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2020-07-20 12:27:20,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-20 12:27:20,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 356 transitions. [2020-07-20 12:27:20,089 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 356 transitions. Word has length 101 [2020-07-20 12:27:20,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:27:20,090 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 356 transitions. [2020-07-20 12:27:20,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 12:27:20,090 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 356 transitions. [2020-07-20 12:27:20,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 12:27:20,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:27:20,091 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 12:27:20,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:27:20,292 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:27:20,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:27:20,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1126316255, now seen corresponding path program 12 times [2020-07-20 12:27:20,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:27:20,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587050029] [2020-07-20 12:27:20,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:27:20,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:27:20,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 12:27:20,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:27:20,476 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 12:27:20,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:27:20,695 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 12:27:20,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587050029] [2020-07-20 12:27:20,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:27:20,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2020-07-20 12:27:20,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180312736] [2020-07-20 12:27:20,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 12:27:20,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:27:20,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 12:27:20,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2020-07-20 12:27:20,697 INFO L87 Difference]: Start difference. First operand 302 states and 356 transitions. Second operand 18 states. [2020-07-20 12:27:22,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:27:22,304 INFO L93 Difference]: Finished difference Result 368 states and 440 transitions. [2020-07-20 12:27:22,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 12:27:22,310 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2020-07-20 12:27:22,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:27:22,314 INFO L225 Difference]: With dead ends: 368 [2020-07-20 12:27:22,314 INFO L226 Difference]: Without dead ends: 338 [2020-07-20 12:27:22,315 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 12:27:22,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-20 12:27:22,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 338. [2020-07-20 12:27:22,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2020-07-20 12:27:22,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 404 transitions. [2020-07-20 12:27:22,364 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 404 transitions. Word has length 109 [2020-07-20 12:27:22,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:27:22,364 INFO L479 AbstractCegarLoop]: Abstraction has 338 states and 404 transitions. [2020-07-20 12:27:22,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 12:27:22,365 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 404 transitions. [2020-07-20 12:27:22,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 12:27:22,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:27:22,366 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 12:27:22,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:27:22,581 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:27:22,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:27:22,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1251867972, now seen corresponding path program 13 times [2020-07-20 12:27:22,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:27:22,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821300952] [2020-07-20 12:27:22,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:27:22,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:27:22,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 12:27:22,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:27:22,949 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:27:23,203 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:27:23,480 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:27:23,789 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:27:24,147 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:27:24,622 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:27:25,180 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:27:25,790 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:27:26,472 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:27:27,195 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:27:28,278 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 12:27:29,358 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 12:27:29,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:27:30,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:27:56,972 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 12:27:56,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821300952] [2020-07-20 12:27:56,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:27:56,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-20 12:27:56,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389331597] [2020-07-20 12:27:56,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 12:27:56,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:27:56,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 12:27:56,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2020-07-20 12:27:56,975 INFO L87 Difference]: Start difference. First operand 338 states and 404 transitions. Second operand 30 states. [2020-07-20 12:28:02,228 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 1) (+ (* 2 c_main_~y2~0) (* 5 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0))) (= (+ c_main_~x1~0 4) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-20 12:28:12,738 WARN L193 SmtUtils]: Spent 524.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 12:28:24,735 WARN L193 SmtUtils]: Spent 988.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 12:28:59,193 WARN L193 SmtUtils]: Spent 381.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:29:41,854 WARN L193 SmtUtils]: Spent 477.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 12:29:43,481 WARN L193 SmtUtils]: Spent 521.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 12:29:46,082 WARN L193 SmtUtils]: Spent 515.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 12:29:48,652 WARN L193 SmtUtils]: Spent 914.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 12:30:17,352 WARN L193 SmtUtils]: Spent 641.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 12:30:31,299 WARN L193 SmtUtils]: Spent 943.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 12:30:46,065 WARN L193 SmtUtils]: Spent 743.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 12:30:49,138 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 1) (+ (* 2 c_main_~y2~0) (* 5 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0))) (= (+ c_main_~x1~0 5) (+ 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 12:30:57,318 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 12:31:04,479 WARN L193 SmtUtils]: Spent 887.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:31:19,378 WARN L193 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 12:31:36,623 WARN L193 SmtUtils]: Spent 668.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:31:50,375 WARN L193 SmtUtils]: Spent 996.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 12:32:11,208 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 12:32:19,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:32:19,301 INFO L93 Difference]: Finished difference Result 512 states and 613 transitions. [2020-07-20 12:32:19,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 12:32:19,309 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 117 [2020-07-20 12:32:19,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:32:19,312 INFO L225 Difference]: With dead ends: 512 [2020-07-20 12:32:19,312 INFO L226 Difference]: Without dead ends: 470 [2020-07-20 12:32:19,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 156.6s TimeCoverageRelationStatistics Valid=194, Invalid=2458, Unknown=8, NotChecked=202, Total=2862 [2020-07-20 12:32:19,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-20 12:32:19,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 470. [2020-07-20 12:32:19,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470 states. [2020-07-20 12:32:19,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 562 transitions. [2020-07-20 12:32:19,349 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 562 transitions. Word has length 117 [2020-07-20 12:32:19,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:32:19,350 INFO L479 AbstractCegarLoop]: Abstraction has 470 states and 562 transitions. [2020-07-20 12:32:19,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 12:32:19,350 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 562 transitions. [2020-07-20 12:32:19,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 12:32:19,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:32:19,352 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 12:32:19,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:32:19,565 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:32:19,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:32:19,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1353613609, now seen corresponding path program 14 times [2020-07-20 12:32:19,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:32:19,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868763872] [2020-07-20 12:32:19,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:32:19,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:32:19,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 12:32:19,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:32:19,731 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 12:32:19,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:32:19,941 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 12:32:19,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868763872] [2020-07-20 12:32:19,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:32:19,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-20 12:32:19,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146075545] [2020-07-20 12:32:19,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 12:32:19,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:32:19,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 12:32:19,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-20 12:32:19,943 INFO L87 Difference]: Start difference. First operand 470 states and 562 transitions. Second operand 17 states. [2020-07-20 12:32:21,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:32:21,741 INFO L93 Difference]: Finished difference Result 532 states and 639 transitions. [2020-07-20 12:32:21,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 12:32:21,751 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 125 [2020-07-20 12:32:21,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:32:21,754 INFO L225 Difference]: With dead ends: 532 [2020-07-20 12:32:21,754 INFO L226 Difference]: Without dead ends: 454 [2020-07-20 12:32:21,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 229 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=119, Invalid=301, Unknown=0, NotChecked=0, Total=420 [2020-07-20 12:32:21,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-07-20 12:32:21,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 452. [2020-07-20 12:32:21,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2020-07-20 12:32:21,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 533 transitions. [2020-07-20 12:32:21,792 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 533 transitions. Word has length 125 [2020-07-20 12:32:21,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:32:21,792 INFO L479 AbstractCegarLoop]: Abstraction has 452 states and 533 transitions. [2020-07-20 12:32:21,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 12:32:21,793 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 533 transitions. [2020-07-20 12:32:21,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 12:32:21,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:32:21,795 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 12:32:22,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:32:22,009 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:32:22,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:32:22,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1050066329, now seen corresponding path program 15 times [2020-07-20 12:32:22,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:32:22,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806578442] [2020-07-20 12:32:22,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:32:22,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:32:22,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 12:32:22,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:32:22,251 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 12:32:22,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:32:22,569 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 12:32:22,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806578442] [2020-07-20 12:32:22,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:32:22,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2020-07-20 12:32:22,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158210999] [2020-07-20 12:32:22,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 12:32:22,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:32:22,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 12:32:22,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-07-20 12:32:22,574 INFO L87 Difference]: Start difference. First operand 452 states and 533 transitions. Second operand 21 states. [2020-07-20 12:32:30,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:32:30,037 INFO L93 Difference]: Finished difference Result 526 states and 627 transitions. [2020-07-20 12:32:30,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 12:32:30,049 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 125 [2020-07-20 12:32:30,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:32:30,051 INFO L225 Difference]: With dead ends: 526 [2020-07-20 12:32:30,051 INFO L226 Difference]: Without dead ends: 492 [2020-07-20 12:32:30,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=329, Invalid=1153, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 12:32:30,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2020-07-20 12:32:30,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 492. [2020-07-20 12:32:30,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 492 states. [2020-07-20 12:32:30,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 586 transitions. [2020-07-20 12:32:30,099 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 586 transitions. Word has length 125 [2020-07-20 12:32:30,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:32:30,099 INFO L479 AbstractCegarLoop]: Abstraction has 492 states and 586 transitions. [2020-07-20 12:32:30,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 12:32:30,099 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 586 transitions. [2020-07-20 12:32:30,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 12:32:30,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:32:30,101 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 12:32:30,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:32:30,315 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:32:30,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:32:30,315 INFO L82 PathProgramCache]: Analyzing trace with hash 3461770, now seen corresponding path program 16 times [2020-07-20 12:32:30,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:32:30,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449741942] [2020-07-20 12:32:30,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:32:30,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:32:30,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 12:32:30,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:32:30,525 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:32:30,857 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:32:31,230 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:32:31,646 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:32:32,135 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:32:32,614 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:32:33,149 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 12:32:33,915 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:32:34,796 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:32:35,719 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:32:36,737 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:32:37,824 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:32:38,968 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 12:32:40,766 WARN L193 SmtUtils]: Spent 414.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 12:32:42,670 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 12:32:42,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:32:44,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:33:36,081 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 12:33:36,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449741942] [2020-07-20 12:33:36,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:33:36,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 34 [2020-07-20 12:33:36,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294651043] [2020-07-20 12:33:36,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 12:33:36,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:33:36,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 12:33:36,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1033, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 12:33:36,084 INFO L87 Difference]: Start difference. First operand 492 states and 586 transitions. Second operand 34 states. [2020-07-20 12:33:49,407 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 12:34:09,391 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 12:34:26,412 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 12:35:16,140 WARN L193 SmtUtils]: Spent 5.44 s on a formula simplification that was a NOOP. DAG size: 22