java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem14_label28.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 20:07:07,675 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 20:07:07,677 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 20:07:07,696 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 20:07:07,696 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 20:07:07,698 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 20:07:07,700 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 20:07:07,712 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 20:07:07,715 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 20:07:07,718 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 20:07:07,719 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 20:07:07,721 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 20:07:07,722 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 20:07:07,725 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 20:07:07,729 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 20:07:07,730 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 20:07:07,732 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 20:07:07,734 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 20:07:07,736 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 20:07:07,738 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 20:07:07,739 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 20:07:07,740 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 20:07:07,741 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 20:07:07,741 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 20:07:07,743 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-13 20:07:07,752 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 20:07:07,753 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 20:07:07,753 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 20:07:07,754 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 [2019-10-13 20:07:07,768 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 20:07:07,768 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 20:07:07,769 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 20:07:07,769 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 20:07:07,770 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 20:07:07,770 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 20:07:07,770 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 20:07:07,770 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 20:07:07,770 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 20:07:07,771 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 20:07:07,771 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 20:07:07,771 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 20:07:07,771 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 20:07:07,771 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 20:07:07,772 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 20:07:07,772 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 20:07:07,772 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 20:07:07,772 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 20:07:07,773 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 20:07:07,773 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 20:07:07,773 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 20:07:07,773 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 20:07:07,773 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 20:07:07,774 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 20:07:07,774 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 20:07:07,774 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 20:07:07,774 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 20:07:07,774 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 20:07:07,774 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-13 20:07:08,068 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 20:07:08,081 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 20:07:08,084 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 20:07:08,086 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 20:07:08,086 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 20:07:08,087 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem14_label28.c [2019-10-13 20:07:08,165 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/06fdea714/ab6d24a981c94df7afe7e53d627fdce8/FLAGfe33928ab [2019-10-13 20:07:08,742 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 20:07:08,742 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem14_label28.c [2019-10-13 20:07:08,759 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/06fdea714/ab6d24a981c94df7afe7e53d627fdce8/FLAGfe33928ab [2019-10-13 20:07:08,970 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/06fdea714/ab6d24a981c94df7afe7e53d627fdce8 [2019-10-13 20:07:08,981 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 20:07:08,983 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 20:07:08,984 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 20:07:08,984 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 20:07:08,988 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 20:07:08,989 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:07:08" (1/1) ... [2019-10-13 20:07:08,991 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42d0e612 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:08, skipping insertion in model container [2019-10-13 20:07:08,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:07:08" (1/1) ... [2019-10-13 20:07:08,999 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 20:07:09,059 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 20:07:09,614 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 20:07:09,619 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 20:07:09,912 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 20:07:09,942 INFO L192 MainTranslator]: Completed translation [2019-10-13 20:07:09,943 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09 WrapperNode [2019-10-13 20:07:09,944 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 20:07:09,945 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 20:07:09,945 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 20:07:09,946 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 20:07:09,968 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (1/1) ... [2019-10-13 20:07:09,969 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (1/1) ... [2019-10-13 20:07:10,015 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (1/1) ... [2019-10-13 20:07:10,015 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (1/1) ... [2019-10-13 20:07:10,082 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (1/1) ... [2019-10-13 20:07:10,103 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (1/1) ... [2019-10-13 20:07:10,116 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (1/1) ... [2019-10-13 20:07:10,128 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 20:07:10,128 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 20:07:10,129 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 20:07:10,129 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 20:07:10,132 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (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 [2019-10-13 20:07:10,208 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 20:07:10,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 20:07:10,209 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-13 20:07:10,209 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 20:07:10,209 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-13 20:07:10,210 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 20:07:10,210 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 20:07:10,210 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-13 20:07:10,210 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 20:07:10,210 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 20:07:10,211 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 20:07:11,597 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 20:07:11,601 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-13 20:07:11,603 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:07:11 BoogieIcfgContainer [2019-10-13 20:07:11,604 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 20:07:11,605 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 20:07:11,605 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 20:07:11,609 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 20:07:11,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 08:07:08" (1/3) ... [2019-10-13 20:07:11,610 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f1db3d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:07:11, skipping insertion in model container [2019-10-13 20:07:11,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:07:09" (2/3) ... [2019-10-13 20:07:11,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f1db3d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:07:11, skipping insertion in model container [2019-10-13 20:07:11,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:07:11" (3/3) ... [2019-10-13 20:07:11,619 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem14_label28.c [2019-10-13 20:07:11,632 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 20:07:11,642 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 20:07:11,653 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 20:07:11,699 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 20:07:11,699 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 20:07:11,701 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 20:07:11,701 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 20:07:11,702 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 20:07:11,702 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 20:07:11,702 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 20:07:11,702 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 20:07:11,742 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states. [2019-10-13 20:07:11,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 20:07:11,753 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:07:11,755 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:07:11,757 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:07:11,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:07:11,766 INFO L82 PathProgramCache]: Analyzing trace with hash -1694474349, now seen corresponding path program 1 times [2019-10-13 20:07:11,777 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:07:11,778 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644463210] [2019-10-13 20:07:11,778 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:11,778 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:11,779 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:07:11,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:07:11,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:07:11,995 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644463210] [2019-10-13 20:07:11,996 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:07:11,996 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 20:07:11,997 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878439909] [2019-10-13 20:07:12,002 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 20:07:12,004 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:07:12,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 20:07:12,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 20:07:12,023 INFO L87 Difference]: Start difference. First operand 254 states. Second operand 4 states. [2019-10-13 20:07:14,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:07:14,111 INFO L93 Difference]: Finished difference Result 890 states and 1606 transitions. [2019-10-13 20:07:14,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 20:07:14,116 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-13 20:07:14,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:07:14,136 INFO L225 Difference]: With dead ends: 890 [2019-10-13 20:07:14,137 INFO L226 Difference]: Without dead ends: 554 [2019-10-13 20:07:14,146 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 20:07:14,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2019-10-13 20:07:14,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 372. [2019-10-13 20:07:14,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2019-10-13 20:07:14,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 524 transitions. [2019-10-13 20:07:14,237 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 524 transitions. Word has length 16 [2019-10-13 20:07:14,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:07:14,237 INFO L462 AbstractCegarLoop]: Abstraction has 372 states and 524 transitions. [2019-10-13 20:07:14,237 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 20:07:14,238 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 524 transitions. [2019-10-13 20:07:14,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-10-13 20:07:14,243 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:07:14,243 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:07:14,243 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:07:14,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:07:14,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1881013151, now seen corresponding path program 1 times [2019-10-13 20:07:14,244 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:07:14,245 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112196072] [2019-10-13 20:07:14,245 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:14,245 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:14,245 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:07:14,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:07:14,743 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:07:14,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112196072] [2019-10-13 20:07:14,744 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:07:14,744 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 20:07:14,745 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153994601] [2019-10-13 20:07:14,746 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 20:07:14,747 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:07:14,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 20:07:14,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-13 20:07:14,748 INFO L87 Difference]: Start difference. First operand 372 states and 524 transitions. Second operand 6 states. [2019-10-13 20:07:16,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:07:16,243 INFO L93 Difference]: Finished difference Result 948 states and 1313 transitions. [2019-10-13 20:07:16,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-13 20:07:16,244 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 99 [2019-10-13 20:07:16,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:07:16,250 INFO L225 Difference]: With dead ends: 948 [2019-10-13 20:07:16,250 INFO L226 Difference]: Without dead ends: 582 [2019-10-13 20:07:16,252 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2019-10-13 20:07:16,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2019-10-13 20:07:16,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 566. [2019-10-13 20:07:16,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 566 states. [2019-10-13 20:07:16,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 566 states to 566 states and 747 transitions. [2019-10-13 20:07:16,295 INFO L78 Accepts]: Start accepts. Automaton has 566 states and 747 transitions. Word has length 99 [2019-10-13 20:07:16,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:07:16,295 INFO L462 AbstractCegarLoop]: Abstraction has 566 states and 747 transitions. [2019-10-13 20:07:16,296 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 20:07:16,296 INFO L276 IsEmpty]: Start isEmpty. Operand 566 states and 747 transitions. [2019-10-13 20:07:16,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2019-10-13 20:07:16,301 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:07:16,301 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:07:16,302 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:07:16,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:07:16,302 INFO L82 PathProgramCache]: Analyzing trace with hash -2144779955, now seen corresponding path program 1 times [2019-10-13 20:07:16,303 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:07:16,303 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485543511] [2019-10-13 20:07:16,303 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:16,303 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:16,303 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:07:16,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:07:16,455 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:07:16,455 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485543511] [2019-10-13 20:07:16,456 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:07:16,456 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 20:07:16,456 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978269807] [2019-10-13 20:07:16,457 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 20:07:16,457 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:07:16,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 20:07:16,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 20:07:16,458 INFO L87 Difference]: Start difference. First operand 566 states and 747 transitions. Second operand 3 states. [2019-10-13 20:07:17,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:07:17,349 INFO L93 Difference]: Finished difference Result 1494 states and 2014 transitions. [2019-10-13 20:07:17,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 20:07:17,351 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 125 [2019-10-13 20:07:17,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:07:17,357 INFO L225 Difference]: With dead ends: 1494 [2019-10-13 20:07:17,357 INFO L226 Difference]: Without dead ends: 934 [2019-10-13 20:07:17,360 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 20:07:17,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 934 states. [2019-10-13 20:07:17,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 934 to 934. [2019-10-13 20:07:17,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 934 states. [2019-10-13 20:07:17,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 934 states to 934 states and 1192 transitions. [2019-10-13 20:07:17,398 INFO L78 Accepts]: Start accepts. Automaton has 934 states and 1192 transitions. Word has length 125 [2019-10-13 20:07:17,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:07:17,398 INFO L462 AbstractCegarLoop]: Abstraction has 934 states and 1192 transitions. [2019-10-13 20:07:17,398 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 20:07:17,399 INFO L276 IsEmpty]: Start isEmpty. Operand 934 states and 1192 transitions. [2019-10-13 20:07:17,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-10-13 20:07:17,404 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:07:17,405 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:07:17,405 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:07:17,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:07:17,406 INFO L82 PathProgramCache]: Analyzing trace with hash 386406922, now seen corresponding path program 1 times [2019-10-13 20:07:17,406 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:07:17,406 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708952355] [2019-10-13 20:07:17,406 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:17,406 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:17,407 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:07:17,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:07:17,690 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:07:17,690 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708952355] [2019-10-13 20:07:17,690 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:07:17,691 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 20:07:17,691 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617240838] [2019-10-13 20:07:17,693 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 20:07:17,693 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:07:17,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 20:07:17,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 20:07:17,694 INFO L87 Difference]: Start difference. First operand 934 states and 1192 transitions. Second operand 6 states. [2019-10-13 20:07:18,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:07:18,909 INFO L93 Difference]: Finished difference Result 2266 states and 3056 transitions. [2019-10-13 20:07:18,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 20:07:18,909 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 156 [2019-10-13 20:07:18,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:07:18,962 INFO L225 Difference]: With dead ends: 2266 [2019-10-13 20:07:18,962 INFO L226 Difference]: Without dead ends: 1520 [2019-10-13 20:07:18,965 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-13 20:07:18,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1520 states. [2019-10-13 20:07:19,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1520 to 1498. [2019-10-13 20:07:19,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1498 states. [2019-10-13 20:07:19,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1498 states to 1498 states and 1870 transitions. [2019-10-13 20:07:19,013 INFO L78 Accepts]: Start accepts. Automaton has 1498 states and 1870 transitions. Word has length 156 [2019-10-13 20:07:19,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:07:19,013 INFO L462 AbstractCegarLoop]: Abstraction has 1498 states and 1870 transitions. [2019-10-13 20:07:19,013 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 20:07:19,014 INFO L276 IsEmpty]: Start isEmpty. Operand 1498 states and 1870 transitions. [2019-10-13 20:07:19,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2019-10-13 20:07:19,017 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:07:19,017 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:07:19,018 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:07:19,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:07:19,018 INFO L82 PathProgramCache]: Analyzing trace with hash -380685670, now seen corresponding path program 1 times [2019-10-13 20:07:19,018 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:07:19,019 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862308744] [2019-10-13 20:07:19,019 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:19,019 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:07:19,019 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:07:19,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:07:19,622 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 99 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:07:19,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862308744] [2019-10-13 20:07:19,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031557820] [2019-10-13 20:07:19,623 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 20:07:19,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:07:19,763 INFO L256 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-13 20:07:19,776 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 20:07:19,882 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 4 terms [2019-10-13 20:07:19,990 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 49 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:07:19,990 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 20:07:20,057 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 4 terms [2019-10-13 20:07:20,417 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 22 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:07:20,417 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1862016163] [2019-10-13 20:07:20,422 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 184 [2019-10-13 20:07:20,480 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 20:07:20,480 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 20:07:25,505 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 20:07:25,507 INFO L272 AbstractInterpreter]: Visited 92 different actions 179 times. Merged at 4 different actions 5 times. Never widened. Performed 398 root evaluator evaluations with a maximum evaluation depth of 13. Performed 398 inverse root evaluator evaluations with a maximum inverse evaluation depth of 13. Found 1 fixpoints after 1 different actions. Largest state had 24 variables. [2019-10-13 20:07:25,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:07:25,511 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 20:07:27,008 INFO L227 lantSequenceWeakener]: Weakened 180 states. On average, predicates are now at 77.22% of their original sizes. [2019-10-13 20:07:27,009 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 20:07:27,078 INFO L553 sIntCurrentIteration]: We unified 182 AI predicates to 182 [2019-10-13 20:07:27,078 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 20:07:27,079 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 20:07:27,080 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [12, 8, 8] total 29 [2019-10-13 20:07:27,080 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544884485] [2019-10-13 20:07:27,081 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 20:07:27,081 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 20:07:27,082 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 20:07:27,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 20:07:27,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2019-10-13 20:07:27,082 INFO L87 Difference]: Start difference. First operand 1498 states and 1870 transitions. Second operand 11 states.