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/array-examples/standard_copy1_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:32:30,714 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:32:30,717 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:32:30,734 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:32:30,746 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:32:30,747 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:32:30,748 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:32:30,749 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:32:30,750 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:32:30,750 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:32:30,752 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:32:30,754 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:32:30,755 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:32:30,756 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:32:30,757 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:32:30,758 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:32:30,760 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:32:30,767 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:32:30,770 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:32:30,770 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:32:30,771 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 01:32:30,792 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:32:30,793 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:32:30,794 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:32:30,794 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:32:30,794 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:32:30,795 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:32:30,795 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:32:30,795 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:32:30,795 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:32:30,795 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:32:30,796 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:32:30,796 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:32:30,797 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:32:30,797 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:32:30,797 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:32:30,797 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:32:30,798 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:32:30,798 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:32:30,798 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:32:30,798 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:32:30,799 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:32:30,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:32:30,799 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:32:30,799 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:32:30,799 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:32:30,800 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:32:30,800 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:32:30,800 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:32:30,800 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 01:32:31,120 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:32:31,133 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:32:31,136 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:32:31,138 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:32:31,138 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:32:31,139 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy1_ground-2.i [2019-10-15 01:32:31,201 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6045804b6/ce2aff59398c428a99855d9e3083dec0/FLAG76fd3a04a [2019-10-15 01:32:31,636 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:32:31,637 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy1_ground-2.i [2019-10-15 01:32:31,644 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6045804b6/ce2aff59398c428a99855d9e3083dec0/FLAG76fd3a04a [2019-10-15 01:32:32,034 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6045804b6/ce2aff59398c428a99855d9e3083dec0 [2019-10-15 01:32:32,045 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:32:32,046 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:32:32,047 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:32,047 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:32:32,050 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:32:32,051 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,053 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@287e3a05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32, skipping insertion in model container [2019-10-15 01:32:32,054 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,061 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:32:32,079 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:32:32,295 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:32,298 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:32:32,322 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:32,342 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:32:32,343 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32 WrapperNode [2019-10-15 01:32:32,343 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:32,344 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:32:32,344 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:32:32,344 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:32:32,435 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,436 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,442 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,443 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,449 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,455 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,456 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,458 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:32:32,459 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:32:32,459 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:32:32,459 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:32:32,460 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (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 01:32:32,526 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:32:32,526 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:32:32,526 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:32:32,526 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:32:32,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:32:32,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:32:32,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:32:32,527 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:32:32,527 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:32:32,527 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:32:32,528 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:32:32,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:32:32,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:32:32,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:32:32,885 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:32:32,886 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-15 01:32:32,887 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:32 BoogieIcfgContainer [2019-10-15 01:32:32,887 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:32:32,888 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:32:32,888 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:32:32,891 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:32:32,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:32:32" (1/3) ... [2019-10-15 01:32:32,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@448fb6cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:32, skipping insertion in model container [2019-10-15 01:32:32,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32" (2/3) ... [2019-10-15 01:32:32,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@448fb6cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:32, skipping insertion in model container [2019-10-15 01:32:32,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:32" (3/3) ... [2019-10-15 01:32:32,894 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy1_ground-2.i [2019-10-15 01:32:32,904 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:32:32,911 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:32:32,923 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:32:32,947 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:32:32,947 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:32:32,947 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:32:32,947 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:32:32,947 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:32:32,947 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:32:32,948 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:32:32,948 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:32:32,962 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-15 01:32:32,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:32:32,967 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:32,967 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:32,969 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:32,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:32,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1524454115, now seen corresponding path program 1 times [2019-10-15 01:32:32,981 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:32,981 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168265964] [2019-10-15 01:32:32,981 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:32,981 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:32,981 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:33,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:33,142 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 01:32:33,143 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168265964] [2019-10-15 01:32:33,144 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:33,144 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:33,144 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985269421] [2019-10-15 01:32:33,149 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:33,150 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:33,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:33,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:33,172 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-10-15 01:32:33,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:33,217 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-10-15 01:32:33,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:33,219 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 01:32:33,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:33,227 INFO L225 Difference]: With dead ends: 33 [2019-10-15 01:32:33,228 INFO L226 Difference]: Without dead ends: 17 [2019-10-15 01:32:33,231 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:33,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-15 01:32:33,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-15 01:32:33,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-15 01:32:33,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-10-15 01:32:33,265 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2019-10-15 01:32:33,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:33,265 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-10-15 01:32:33,265 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:33,265 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-10-15 01:32:33,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:32:33,266 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:33,266 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:33,267 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:33,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:33,268 INFO L82 PathProgramCache]: Analyzing trace with hash -32570220, now seen corresponding path program 1 times [2019-10-15 01:32:33,268 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:33,269 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844709030] [2019-10-15 01:32:33,269 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,269 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,269 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:33,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:33,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:32:33,335 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844709030] [2019-10-15 01:32:33,335 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:33,336 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:33,336 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478337710] [2019-10-15 01:32:33,338 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:33,338 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:33,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:33,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:33,339 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2019-10-15 01:32:33,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:33,355 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2019-10-15 01:32:33,355 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:33,356 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-15 01:32:33,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:33,357 INFO L225 Difference]: With dead ends: 27 [2019-10-15 01:32:33,357 INFO L226 Difference]: Without dead ends: 18 [2019-10-15 01:32:33,358 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:33,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-15 01:32:33,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-15 01:32:33,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:32:33,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-10-15 01:32:33,364 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-10-15 01:32:33,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:33,365 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-10-15 01:32:33,365 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:33,365 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-10-15 01:32:33,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:32:33,366 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:33,366 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:33,366 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:33,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:33,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1459604560, now seen corresponding path program 1 times [2019-10-15 01:32:33,367 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:33,368 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304252391] [2019-10-15 01:32:33,368 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,368 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,368 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:33,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:33,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:32:33,461 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304252391] [2019-10-15 01:32:33,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960933175] [2019-10-15 01:32:33,462 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 01:32:33,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:33,530 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:32:33,540 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:33,584 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:32:33,585 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:33,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:32:33,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1016628800] [2019-10-15 01:32:33,649 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:32:33,649 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:33,656 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:33,663 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:33,664 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:33,854 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:34,285 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:34,299 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:34,306 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:34,694 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:34,694 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:32:34,695 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601739738] [2019-10-15 01:32:34,696 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:32:34,697 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:34,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:32:34,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:32:34,698 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 18 states. [2019-10-15 01:32:35,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:35,420 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2019-10-15 01:32:35,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:32:35,421 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2019-10-15 01:32:35,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:35,422 INFO L225 Difference]: With dead ends: 42 [2019-10-15 01:32:35,422 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:32:35,425 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:32:35,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:32:35,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 22. [2019-10-15 01:32:35,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:32:35,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-15 01:32:35,436 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 14 [2019-10-15 01:32:35,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:35,437 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-15 01:32:35,437 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:32:35,437 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-15 01:32:35,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 01:32:35,438 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:35,439 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:35,652 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:35,653 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:35,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:35,654 INFO L82 PathProgramCache]: Analyzing trace with hash -2046081309, now seen corresponding path program 2 times [2019-10-15 01:32:35,655 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:35,655 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511874769] [2019-10-15 01:32:35,655 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,656 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,656 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:35,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:35,735 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:32:35,735 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511874769] [2019-10-15 01:32:35,735 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95117655] [2019-10-15 01:32:35,736 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 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 01:32:35,794 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:32:35,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:35,795 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:32:35,798 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:35,812 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:32:35,812 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:35,848 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:32:35,849 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [142874975] [2019-10-15 01:32:35,851 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:32:35,851 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:35,852 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:35,852 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:35,852 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:35,883 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:36,102 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:36,125 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:36,131 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:36,469 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:36,470 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-10-15 01:32:36,470 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735490138] [2019-10-15 01:32:36,471 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 01:32:36,471 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:36,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 01:32:36,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2019-10-15 01:32:36,472 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 19 states. [2019-10-15 01:32:37,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:37,098 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2019-10-15 01:32:37,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:32:37,099 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2019-10-15 01:32:37,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:37,101 INFO L225 Difference]: With dead ends: 44 [2019-10-15 01:32:37,101 INFO L226 Difference]: Without dead ends: 35 [2019-10-15 01:32:37,102 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=186, Invalid=806, Unknown=0, NotChecked=0, Total=992 [2019-10-15 01:32:37,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-15 01:32:37,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 26. [2019-10-15 01:32:37,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-15 01:32:37,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-10-15 01:32:37,110 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2019-10-15 01:32:37,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:37,110 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-10-15 01:32:37,110 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 01:32:37,110 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-10-15 01:32:37,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-15 01:32:37,111 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:37,111 INFO L380 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:37,315 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:37,316 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:37,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:37,317 INFO L82 PathProgramCache]: Analyzing trace with hash -398092701, now seen corresponding path program 3 times [2019-10-15 01:32:37,317 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:37,318 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227490069] [2019-10-15 01:32:37,318 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,318 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,319 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:37,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:37,454 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:32:37,454 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227490069] [2019-10-15 01:32:37,455 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718781422] [2019-10-15 01:32:37,455 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 01:32:37,550 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:37,551 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:37,555 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 01:32:37,563 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:37,628 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:32:37,629 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:37,713 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:32:37,714 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239053540] [2019-10-15 01:32:37,716 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:32:37,716 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:37,717 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:37,718 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:37,718 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:37,768 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:38,008 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:38,022 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:38,028 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:38,393 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:38,393 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7, 11] total 29 [2019-10-15 01:32:38,393 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625803953] [2019-10-15 01:32:38,394 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-15 01:32:38,395 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:38,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-15 01:32:38,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2019-10-15 01:32:38,396 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 29 states. [2019-10-15 01:32:39,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:39,489 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2019-10-15 01:32:39,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-15 01:32:39,489 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 22 [2019-10-15 01:32:39,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:39,490 INFO L225 Difference]: With dead ends: 58 [2019-10-15 01:32:39,491 INFO L226 Difference]: Without dead ends: 42 [2019-10-15 01:32:39,494 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=398, Invalid=2358, Unknown=0, NotChecked=0, Total=2756 [2019-10-15 01:32:39,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-15 01:32:39,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 33. [2019-10-15 01:32:39,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 01:32:39,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-10-15 01:32:39,511 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 22 [2019-10-15 01:32:39,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:39,512 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-10-15 01:32:39,512 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-15 01:32:39,512 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-10-15 01:32:39,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:32:39,514 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:39,514 INFO L380 BasicCegarLoop]: trace histogram [10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:39,717 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:39,718 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:39,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:39,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1654238721, now seen corresponding path program 4 times [2019-10-15 01:32:39,719 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:39,720 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456313703] [2019-10-15 01:32:39,720 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:39,720 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:39,720 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:39,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:39,883 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-15 01:32:39,884 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456313703] [2019-10-15 01:32:39,885 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871231805] [2019-10-15 01:32:39,885 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:39,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:39,962 INFO L256 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-15 01:32:39,967 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:39,988 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-15 01:32:39,988 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:40,256 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-15 01:32:40,257 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [244700544] [2019-10-15 01:32:40,260 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:32:40,260 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:40,261 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:40,262 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:40,263 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:40,290 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:40,509 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:40,525 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:40,535 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:40,837 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:40,838 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 11] total 35 [2019-10-15 01:32:40,838 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024734141] [2019-10-15 01:32:40,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-15 01:32:40,840 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:40,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-15 01:32:40,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2019-10-15 01:32:40,841 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 35 states. [2019-10-15 01:32:42,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:42,154 INFO L93 Difference]: Finished difference Result 71 states and 86 transitions. [2019-10-15 01:32:42,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-15 01:32:42,159 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 29 [2019-10-15 01:32:42,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:42,160 INFO L225 Difference]: With dead ends: 71 [2019-10-15 01:32:42,160 INFO L226 Difference]: Without dead ends: 54 [2019-10-15 01:32:42,162 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=934, Invalid=3098, Unknown=0, NotChecked=0, Total=4032 [2019-10-15 01:32:42,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-15 01:32:42,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2019-10-15 01:32:42,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-15 01:32:42,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2019-10-15 01:32:42,183 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 29 [2019-10-15 01:32:42,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:42,184 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2019-10-15 01:32:42,184 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-15 01:32:42,184 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2019-10-15 01:32:42,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-15 01:32:42,185 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:42,185 INFO L380 BasicCegarLoop]: trace histogram [22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:42,386 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:42,387 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:42,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:42,387 INFO L82 PathProgramCache]: Analyzing trace with hash 243464513, now seen corresponding path program 5 times [2019-10-15 01:32:42,388 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:42,388 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286684947] [2019-10-15 01:32:42,388 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:42,389 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:42,389 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:42,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:42,769 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-15 01:32:42,769 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286684947] [2019-10-15 01:32:42,770 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757874800] [2019-10-15 01:32:42,770 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:42,927 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-15 01:32:42,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:42,928 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-15 01:32:42,931 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:43,069 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-10-15 01:32:43,069 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:43,261 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-10-15 01:32:43,262 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029575743] [2019-10-15 01:32:43,263 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:32:43,263 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:43,264 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:43,264 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:43,264 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:43,302 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:43,503 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:43,511 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:43,514 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:43,913 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:43,914 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 10, 10, 11] total 51 [2019-10-15 01:32:43,914 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47490947] [2019-10-15 01:32:43,915 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-10-15 01:32:43,916 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:43,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-10-15 01:32:43,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=2069, Unknown=0, NotChecked=0, Total=2550 [2019-10-15 01:32:43,917 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 51 states. [2019-10-15 01:32:46,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:46,449 INFO L93 Difference]: Finished difference Result 81 states and 94 transitions. [2019-10-15 01:32:46,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-10-15 01:32:46,450 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 41 [2019-10-15 01:32:46,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:46,452 INFO L225 Difference]: With dead ends: 81 [2019-10-15 01:32:46,452 INFO L226 Difference]: Without dead ends: 64 [2019-10-15 01:32:46,456 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2221 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1469, Invalid=7843, Unknown=0, NotChecked=0, Total=9312 [2019-10-15 01:32:46,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-15 01:32:46,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 55. [2019-10-15 01:32:46,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-15 01:32:46,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2019-10-15 01:32:46,475 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 41 [2019-10-15 01:32:46,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:46,475 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2019-10-15 01:32:46,475 INFO L463 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-10-15 01:32:46,475 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2019-10-15 01:32:46,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-15 01:32:46,478 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:46,479 INFO L380 BasicCegarLoop]: trace histogram [23, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:46,679 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:46,680 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:46,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:46,681 INFO L82 PathProgramCache]: Analyzing trace with hash 2063520052, now seen corresponding path program 6 times [2019-10-15 01:32:46,681 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:46,681 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930299798] [2019-10-15 01:32:46,682 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:46,682 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:46,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:46,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:46,994 INFO L134 CoverageAnalysis]: Checked inductivity of 412 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-15 01:32:46,994 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930299798] [2019-10-15 01:32:46,994 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562144057] [2019-10-15 01:32:46,994 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:47,104 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:47,104 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:47,106 INFO L256 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-15 01:32:47,109 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:47,127 INFO L134 CoverageAnalysis]: Checked inductivity of 412 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-15 01:32:47,128 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:47,808 INFO L134 CoverageAnalysis]: Checked inductivity of 412 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-15 01:32:47,809 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [243979461] [2019-10-15 01:32:47,810 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:32:47,810 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:47,811 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:47,811 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:47,811 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:47,836 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:47,991 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:47,997 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:48,000 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:48,352 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:48,353 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 11] total 61 [2019-10-15 01:32:48,353 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073835087] [2019-10-15 01:32:48,354 INFO L442 AbstractCegarLoop]: Interpolant automaton has 61 states [2019-10-15 01:32:48,355 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:48,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2019-10-15 01:32:48,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1304, Invalid=2356, Unknown=0, NotChecked=0, Total=3660 [2019-10-15 01:32:48,357 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 61 states. [2019-10-15 01:32:51,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:51,060 INFO L93 Difference]: Finished difference Result 115 states and 143 transitions. [2019-10-15 01:32:51,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-10-15 01:32:51,061 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 51 [2019-10-15 01:32:51,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:51,063 INFO L225 Difference]: With dead ends: 115 [2019-10-15 01:32:51,063 INFO L226 Difference]: Without dead ends: 89 [2019-10-15 01:32:51,067 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2979 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3807, Invalid=9533, Unknown=0, NotChecked=0, Total=13340 [2019-10-15 01:32:51,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-15 01:32:51,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 80. [2019-10-15 01:32:51,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-15 01:32:51,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2019-10-15 01:32:51,079 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 51 [2019-10-15 01:32:51,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:51,080 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2019-10-15 01:32:51,080 INFO L463 AbstractCegarLoop]: Interpolant automaton has 61 states. [2019-10-15 01:32:51,080 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2019-10-15 01:32:51,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-10-15 01:32:51,081 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:51,081 INFO L380 BasicCegarLoop]: trace histogram [48, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:51,284 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:51,285 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:51,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:51,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1307214819, now seen corresponding path program 7 times [2019-10-15 01:32:51,286 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:51,286 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843013989] [2019-10-15 01:32:51,287 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,287 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,287 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:51,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:52,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-15 01:32:52,392 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843013989] [2019-10-15 01:32:52,392 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755571942] [2019-10-15 01:32:52,392 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:52,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:52,545 INFO L256 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 50 conjunts are in the unsatisfiable core [2019-10-15 01:32:52,561 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:52,591 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-15 01:32:52,591 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:55,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-15 01:32:55,194 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [304272469] [2019-10-15 01:32:55,196 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:32:55,196 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:55,196 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:55,196 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:55,197 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:55,217 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:55,358 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:55,364 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:55,366 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:55,851 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:55,851 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 11] total 111 [2019-10-15 01:32:55,852 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732162019] [2019-10-15 01:32:55,853 INFO L442 AbstractCegarLoop]: Interpolant automaton has 111 states [2019-10-15 01:32:55,853 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:55,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2019-10-15 01:32:55,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=7131, Unknown=0, NotChecked=0, Total=12210 [2019-10-15 01:32:55,858 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 111 states. [2019-10-15 01:33:03,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:03,188 INFO L93 Difference]: Finished difference Result 165 states and 218 transitions. [2019-10-15 01:33:03,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2019-10-15 01:33:03,189 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 76 [2019-10-15 01:33:03,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:03,191 INFO L225 Difference]: With dead ends: 165 [2019-10-15 01:33:03,191 INFO L226 Difference]: Without dead ends: 139 [2019-10-15 01:33:03,195 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9104 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=15032, Invalid=31408, Unknown=0, NotChecked=0, Total=46440 [2019-10-15 01:33:03,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2019-10-15 01:33:03,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 130. [2019-10-15 01:33:03,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-10-15 01:33:03,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2019-10-15 01:33:03,211 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 76 [2019-10-15 01:33:03,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:03,211 INFO L462 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2019-10-15 01:33:03,211 INFO L463 AbstractCegarLoop]: Interpolant automaton has 111 states. [2019-10-15 01:33:03,212 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2019-10-15 01:33:03,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-10-15 01:33:03,213 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:03,214 INFO L380 BasicCegarLoop]: trace histogram [98, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:03,419 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:03,420 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:03,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:03,420 INFO L82 PathProgramCache]: Analyzing trace with hash -240161533, now seen corresponding path program 8 times [2019-10-15 01:33:03,421 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:03,421 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490485437] [2019-10-15 01:33:03,421 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:03,421 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:03,422 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:03,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:07,244 INFO L134 CoverageAnalysis]: Checked inductivity of 4987 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-15 01:33:07,245 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490485437] [2019-10-15 01:33:07,245 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402093374] [2019-10-15 01:33:07,245 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:08,600 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-15 01:33:08,600 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:33:08,604 INFO L256 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-15 01:33:08,608 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:09,402 INFO L134 CoverageAnalysis]: Checked inductivity of 4987 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2019-10-15 01:33:09,402 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:10,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4987 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2019-10-15 01:33:10,392 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1017580551] [2019-10-15 01:33:10,394 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:33:10,394 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:10,394 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:10,394 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:10,395 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:10,409 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:10,546 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:33:10,556 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:10,562 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:11,384 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:11,385 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 19, 19, 11] total 145 [2019-10-15 01:33:11,385 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175683609] [2019-10-15 01:33:11,387 INFO L442 AbstractCegarLoop]: Interpolant automaton has 145 states [2019-10-15 01:33:11,387 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:11,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2019-10-15 01:33:11,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5708, Invalid=15172, Unknown=0, NotChecked=0, Total=20880 [2019-10-15 01:33:11,390 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand 145 states.