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 --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/loop-invgen/sendmail-close-angle.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:02:35,676 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:02:35,679 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:02:35,696 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:02:35,697 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:02:35,699 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:02:35,701 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:02:35,709 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:02:35,714 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:02:35,718 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:02:35,719 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:02:35,720 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:02:35,720 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:02:35,722 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:02:35,725 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:02:35,726 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:02:35,727 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:02:35,729 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:02:35,731 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:02:35,735 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:02:35,739 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:02:35,742 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:02:35,746 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:02:35,746 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:02:35,748 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 03:02:35,759 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:02:35,760 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:02:35,761 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:02:35,762 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 [2019-10-15 03:02:35,783 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:02:35,783 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:02:35,784 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:02:35,785 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:02:35,785 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:02:35,785 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:02:35,785 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:02:35,786 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:02:35,786 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:02:35,786 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:02:35,789 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:02:35,789 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:02:35,790 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:02:35,790 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:02:35,790 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:02:35,790 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:02:35,790 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:02:35,791 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:02:35,791 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:02:35,791 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:02:35,792 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:02:35,792 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:02:35,793 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:02:35,794 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:02:35,794 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:02:35,794 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:02:35,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:02:35,794 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:02:35,795 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 03:02:36,074 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:02:36,086 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:02:36,090 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:02:36,091 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:02:36,092 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:02:36,092 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/sendmail-close-angle.i [2019-10-15 03:02:36,150 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f40ce68f5/fe6cadb66d324b30bf898630b06b3838/FLAG63391aa3c [2019-10-15 03:02:36,615 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:02:36,617 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/sendmail-close-angle.i [2019-10-15 03:02:36,624 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f40ce68f5/fe6cadb66d324b30bf898630b06b3838/FLAG63391aa3c [2019-10-15 03:02:36,996 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f40ce68f5/fe6cadb66d324b30bf898630b06b3838 [2019-10-15 03:02:37,007 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:02:37,009 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:02:37,010 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:02:37,010 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:02:37,014 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:02:37,015 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:02:36" (1/1) ... [2019-10-15 03:02:37,018 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4fc689a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37, skipping insertion in model container [2019-10-15 03:02:37,018 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:02:36" (1/1) ... [2019-10-15 03:02:37,026 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:02:37,047 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:02:37,227 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:02:37,231 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:02:37,249 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:02:37,262 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:02:37,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37 WrapperNode [2019-10-15 03:02:37,263 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:02:37,264 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:02:37,264 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:02:37,264 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:02:37,356 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (1/1) ... [2019-10-15 03:02:37,356 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (1/1) ... [2019-10-15 03:02:37,362 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (1/1) ... [2019-10-15 03:02:37,363 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (1/1) ... [2019-10-15 03:02:37,367 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (1/1) ... [2019-10-15 03:02:37,372 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (1/1) ... [2019-10-15 03:02:37,374 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (1/1) ... [2019-10-15 03:02:37,376 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:02:37,377 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:02:37,377 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:02:37,377 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:02:37,378 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (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 [2019-10-15 03:02:37,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:02:37,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:02:37,437 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:02:37,437 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:02:37,438 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:02:37,438 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 03:02:37,438 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:02:37,438 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 03:02:37,438 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:02:37,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:02:37,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:02:37,704 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:02:37,704 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 03:02:37,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:02:37 BoogieIcfgContainer [2019-10-15 03:02:37,712 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:02:37,713 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:02:37,713 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:02:37,720 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:02:37,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:02:36" (1/3) ... [2019-10-15 03:02:37,721 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40b35842 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:02:37, skipping insertion in model container [2019-10-15 03:02:37,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:02:37" (2/3) ... [2019-10-15 03:02:37,722 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40b35842 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:02:37, skipping insertion in model container [2019-10-15 03:02:37,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:02:37" (3/3) ... [2019-10-15 03:02:37,725 INFO L109 eAbstractionObserver]: Analyzing ICFG sendmail-close-angle.i [2019-10-15 03:02:37,736 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:02:37,744 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:02:37,768 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:02:37,790 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:02:37,791 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:02:37,791 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:02:37,791 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:02:37,791 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:02:37,791 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:02:37,792 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:02:37,792 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:02:37,811 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2019-10-15 03:02:37,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 03:02:37,817 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:37,817 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:02:37,819 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:37,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:37,825 INFO L82 PathProgramCache]: Analyzing trace with hash 345773710, now seen corresponding path program 1 times [2019-10-15 03:02:37,832 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:37,833 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355902254] [2019-10-15 03:02:37,833 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:37,833 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:37,833 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:37,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:38,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:02:38,003 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355902254] [2019-10-15 03:02:38,005 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:02:38,005 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 03:02:38,006 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918010060] [2019-10-15 03:02:38,011 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 03:02:38,012 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:02:38,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 03:02:38,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:02:38,032 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 2 states. [2019-10-15 03:02:38,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:02:38,069 INFO L93 Difference]: Finished difference Result 56 states and 87 transitions. [2019-10-15 03:02:38,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 03:02:38,071 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2019-10-15 03:02:38,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:02:38,082 INFO L225 Difference]: With dead ends: 56 [2019-10-15 03:02:38,083 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 03:02:38,087 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:02:38,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 03:02:38,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-10-15 03:02:38,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 03:02:38,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2019-10-15 03:02:38,140 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 13 [2019-10-15 03:02:38,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:02:38,141 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2019-10-15 03:02:38,141 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 03:02:38,141 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2019-10-15 03:02:38,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 03:02:38,143 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:38,143 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:02:38,144 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:38,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:38,144 INFO L82 PathProgramCache]: Analyzing trace with hash 1539602810, now seen corresponding path program 1 times [2019-10-15 03:02:38,145 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:38,145 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979293208] [2019-10-15 03:02:38,145 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:38,146 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:38,146 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:38,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:38,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:02:38,248 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979293208] [2019-10-15 03:02:38,248 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:02:38,248 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 03:02:38,249 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854359453] [2019-10-15 03:02:38,251 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 03:02:38,251 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:02:38,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 03:02:38,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 03:02:38,252 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand 5 states. [2019-10-15 03:02:38,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:02:38,397 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-10-15 03:02:38,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 03:02:38,398 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2019-10-15 03:02:38,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:02:38,400 INFO L225 Difference]: With dead ends: 33 [2019-10-15 03:02:38,400 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 03:02:38,403 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 03:02:38,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 03:02:38,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-15 03:02:38,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-15 03:02:38,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2019-10-15 03:02:38,430 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 14 [2019-10-15 03:02:38,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:02:38,431 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2019-10-15 03:02:38,431 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 03:02:38,431 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2019-10-15 03:02:38,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-15 03:02:38,433 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:38,433 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:02:38,433 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:38,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:38,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1090524767, now seen corresponding path program 1 times [2019-10-15 03:02:38,435 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:38,435 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321947439] [2019-10-15 03:02:38,435 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:38,436 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:38,437 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:38,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:38,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:02:38,560 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321947439] [2019-10-15 03:02:38,564 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:02:38,564 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 03:02:38,564 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279808052] [2019-10-15 03:02:38,565 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 03:02:38,565 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:02:38,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 03:02:38,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-15 03:02:38,569 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 6 states. [2019-10-15 03:02:38,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:02:38,783 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2019-10-15 03:02:38,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 03:02:38,784 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-10-15 03:02:38,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:02:38,786 INFO L225 Difference]: With dead ends: 46 [2019-10-15 03:02:38,786 INFO L226 Difference]: Without dead ends: 44 [2019-10-15 03:02:38,787 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-10-15 03:02:38,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-15 03:02:38,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2019-10-15 03:02:38,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-15 03:02:38,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 54 transitions. [2019-10-15 03:02:38,800 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 54 transitions. Word has length 19 [2019-10-15 03:02:38,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:02:38,800 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 54 transitions. [2019-10-15 03:02:38,800 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 03:02:38,800 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 54 transitions. [2019-10-15 03:02:38,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 03:02:38,802 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:38,802 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:02:38,802 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:38,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:38,803 INFO L82 PathProgramCache]: Analyzing trace with hash 809711761, now seen corresponding path program 1 times [2019-10-15 03:02:38,803 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:38,804 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090220705] [2019-10-15 03:02:38,804 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:38,804 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:38,804 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:38,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:38,899 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 03:02:38,899 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090220705] [2019-10-15 03:02:38,900 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:02:38,900 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 03:02:38,900 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674738674] [2019-10-15 03:02:38,902 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 03:02:38,903 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:02:38,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 03:02:38,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-10-15 03:02:38,904 INFO L87 Difference]: Start difference. First operand 42 states and 54 transitions. Second operand 6 states. [2019-10-15 03:02:39,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:02:39,041 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2019-10-15 03:02:39,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 03:02:39,041 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2019-10-15 03:02:39,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:02:39,043 INFO L225 Difference]: With dead ends: 52 [2019-10-15 03:02:39,043 INFO L226 Difference]: Without dead ends: 50 [2019-10-15 03:02:39,044 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-15 03:02:39,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-15 03:02:39,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 46. [2019-10-15 03:02:39,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-15 03:02:39,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2019-10-15 03:02:39,056 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 26 [2019-10-15 03:02:39,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:02:39,056 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2019-10-15 03:02:39,057 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 03:02:39,057 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2019-10-15 03:02:39,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 03:02:39,058 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:39,058 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:02:39,059 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:39,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:39,059 INFO L82 PathProgramCache]: Analyzing trace with hash -157864588, now seen corresponding path program 1 times [2019-10-15 03:02:39,060 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:39,060 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657380] [2019-10-15 03:02:39,060 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:39,060 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:39,061 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:39,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:39,144 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 03:02:39,144 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657380] [2019-10-15 03:02:39,145 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:02:39,145 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-10-15 03:02:39,145 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915404036] [2019-10-15 03:02:39,146 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-15 03:02:39,146 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:02:39,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-15 03:02:39,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2019-10-15 03:02:39,147 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand 7 states. [2019-10-15 03:02:39,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:02:39,368 INFO L93 Difference]: Finished difference Result 67 states and 86 transitions. [2019-10-15 03:02:39,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 03:02:39,368 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2019-10-15 03:02:39,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:02:39,370 INFO L225 Difference]: With dead ends: 67 [2019-10-15 03:02:39,371 INFO L226 Difference]: Without dead ends: 60 [2019-10-15 03:02:39,371 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-10-15 03:02:39,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-15 03:02:39,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-10-15 03:02:39,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-15 03:02:39,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2019-10-15 03:02:39,403 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 30 [2019-10-15 03:02:39,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:02:39,407 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2019-10-15 03:02:39,407 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-15 03:02:39,408 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2019-10-15 03:02:39,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-15 03:02:39,409 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:39,409 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:02:39,409 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:39,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:39,410 INFO L82 PathProgramCache]: Analyzing trace with hash 501600618, now seen corresponding path program 1 times [2019-10-15 03:02:39,410 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:39,410 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634281369] [2019-10-15 03:02:39,411 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:39,411 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:39,411 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:39,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:39,499 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 03:02:39,500 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634281369] [2019-10-15 03:02:39,500 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:02:39,500 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-10-15 03:02:39,501 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306837581] [2019-10-15 03:02:39,501 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-15 03:02:39,501 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:02:39,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-15 03:02:39,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2019-10-15 03:02:39,502 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 7 states. [2019-10-15 03:02:39,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:02:39,624 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2019-10-15 03:02:39,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 03:02:39,624 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 31 [2019-10-15 03:02:39,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:02:39,626 INFO L225 Difference]: With dead ends: 68 [2019-10-15 03:02:39,626 INFO L226 Difference]: Without dead ends: 66 [2019-10-15 03:02:39,627 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-10-15 03:02:39,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-15 03:02:39,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2019-10-15 03:02:39,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-15 03:02:39,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 75 transitions. [2019-10-15 03:02:39,639 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 75 transitions. Word has length 31 [2019-10-15 03:02:39,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:02:39,639 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 75 transitions. [2019-10-15 03:02:39,640 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-15 03:02:39,640 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 75 transitions. [2019-10-15 03:02:39,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-15 03:02:39,642 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:39,642 INFO L380 BasicCegarLoop]: trace histogram [8, 7, 7, 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] [2019-10-15 03:02:39,647 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:39,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:39,648 INFO L82 PathProgramCache]: Analyzing trace with hash 397668462, now seen corresponding path program 1 times [2019-10-15 03:02:39,648 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:39,648 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933101700] [2019-10-15 03:02:39,649 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:39,649 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:39,649 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:39,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:39,870 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 03:02:39,871 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933101700] [2019-10-15 03:02:39,871 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587382631] [2019-10-15 03:02:39,871 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 [2019-10-15 03:02:39,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:39,939 INFO L256 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-15 03:02:39,949 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:02:40,151 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:02:40,202 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 21 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-15 03:02:40,203 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:02:40,301 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:02:40,332 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:02:40,334 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:02:40,432 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 21 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-15 03:02:40,433 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2070377624] [2019-10-15 03:02:40,462 INFO L162 IcfgInterpreter]: Started Sifa with 27 locations of interest [2019-10-15 03:02:40,462 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:02:40,470 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:02:40,479 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:02:40,480 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:02:40,543 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:02:46,215 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 15 [2019-10-15 03:02:46,836 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 11 [2019-10-15 03:02:53,347 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-10-15 03:02:53,365 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:02:53,368 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:02:53,836 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 29 [2019-10-15 03:02:54,031 WARN L191 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 31 [2019-10-15 03:02:54,640 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:02:54,641 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 16] total 34 [2019-10-15 03:02:54,641 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983640883] [2019-10-15 03:02:54,645 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-15 03:02:54,645 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:02:54,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-15 03:02:54,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=982, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 03:02:54,646 INFO L87 Difference]: Start difference. First operand 62 states and 75 transitions. Second operand 34 states. [2019-10-15 03:02:55,362 WARN L191 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 26 [2019-10-15 03:02:56,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:02:56,974 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2019-10-15 03:02:56,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-15 03:02:56,975 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 54 [2019-10-15 03:02:56,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:02:56,977 INFO L225 Difference]: With dead ends: 81 [2019-10-15 03:02:56,977 INFO L226 Difference]: Without dead ends: 66 [2019-10-15 03:02:56,979 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 130 SyntacticMatches, 8 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=458, Invalid=1992, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 03:02:56,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-15 03:02:56,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 57. [2019-10-15 03:02:56,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-15 03:02:56,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2019-10-15 03:02:56,989 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 54 [2019-10-15 03:02:56,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:02:56,990 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2019-10-15 03:02:56,990 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-15 03:02:56,990 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2019-10-15 03:02:56,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-15 03:02:56,992 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:02:56,992 INFO L380 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:02:57,196 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:02:57,197 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:02:57,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:02:57,197 INFO L82 PathProgramCache]: Analyzing trace with hash 543255984, now seen corresponding path program 1 times [2019-10-15 03:02:57,197 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:02:57,198 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363834134] [2019-10-15 03:02:57,198 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:57,198 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:02:57,199 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:02:57,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:57,278 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 03:02:57,278 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363834134] [2019-10-15 03:02:57,279 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33218198] [2019-10-15 03:02:57,279 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:02:57,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:02:57,450 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-15 03:02:57,453 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:02:57,538 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 03:02:57,538 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:02:57,590 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 03:02:57,591 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027766368] [2019-10-15 03:02:57,593 INFO L162 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-10-15 03:02:57,594 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:02:57,594 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:02:57,595 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:02:57,595 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:02:57,603 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:03:00,197 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 12 [2019-10-15 03:03:03,713 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-10-15 03:03:03,729 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:03:03,730 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:03:04,089 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 29 [2019-10-15 03:03:04,592 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:03:04,593 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 14] total 26 [2019-10-15 03:03:04,593 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324538715] [2019-10-15 03:03:04,594 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 03:03:04,594 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:03:04,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 03:03:04,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2019-10-15 03:03:04,595 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 26 states. [2019-10-15 03:03:06,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:03:06,293 INFO L93 Difference]: Finished difference Result 72 states and 82 transitions. [2019-10-15 03:03:06,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-15 03:03:06,296 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 55 [2019-10-15 03:03:06,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:03:06,299 INFO L225 Difference]: With dead ends: 72 [2019-10-15 03:03:06,299 INFO L226 Difference]: Without dead ends: 70 [2019-10-15 03:03:06,300 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=356, Invalid=1366, Unknown=0, NotChecked=0, Total=1722 [2019-10-15 03:03:06,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-15 03:03:06,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-10-15 03:03:06,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-15 03:03:06,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2019-10-15 03:03:06,311 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 55 [2019-10-15 03:03:06,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:03:06,312 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2019-10-15 03:03:06,312 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 03:03:06,312 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2019-10-15 03:03:06,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2019-10-15 03:03:06,314 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:03:06,314 INFO L380 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:03:06,520 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:03:06,522 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:03:06,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:03:06,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1878118460, now seen corresponding path program 2 times [2019-10-15 03:03:06,523 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:03:06,523 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41899134] [2019-10-15 03:03:06,524 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:06,524 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:06,524 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:03:06,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:03:06,760 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 30 proven. 42 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2019-10-15 03:03:06,760 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41899134] [2019-10-15 03:03:06,761 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091972916] [2019-10-15 03:03:06,761 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:03:07,011 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-15 03:03:07,011 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:03:07,012 INFO L256 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-15 03:03:07,031 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:03:07,312 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 100 proven. 56 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2019-10-15 03:03:07,312 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:03:07,730 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 100 proven. 56 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2019-10-15 03:03:07,731 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2072507528] [2019-10-15 03:03:07,733 INFO L162 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-10-15 03:03:07,734 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:03:07,734 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:03:07,734 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:03:07,735 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:03:07,743 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:03:13,746 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-10-15 03:03:13,763 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:03:13,764 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:03:14,438 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 31 [2019-10-15 03:03:14,814 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 31 [2019-10-15 03:03:15,095 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:03:15,095 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 14] total 40 [2019-10-15 03:03:15,096 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203113349] [2019-10-15 03:03:15,097 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-10-15 03:03:15,097 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:03:15,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-10-15 03:03:15,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1375, Unknown=0, NotChecked=0, Total=1560 [2019-10-15 03:03:15,099 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand 40 states. [2019-10-15 03:03:17,177 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 36 [2019-10-15 03:03:17,439 WARN L191 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42