/usr/bin/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_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:25:41,540 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:25:41,564 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:25:41,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:25:41,566 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:25:41,567 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:25:41,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:25:41,569 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:25:41,570 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:25:41,572 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:25:41,574 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:25:41,575 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:25:41,576 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:25:41,576 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:25:41,579 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:25:41,586 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:25:41,587 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:25:41,588 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:25:41,588 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 [2019-11-07 01:25:41,611 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:25:41,611 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:25:41,612 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:25:41,612 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:25:41,612 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:25:41,613 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:25:41,613 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:25:41,613 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:25:41,613 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:25:41,613 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:25:41,615 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:25:41,615 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:25:41,615 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:25:41,616 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:25:41,616 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:25:41,616 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:25:41,617 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:25:41,617 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:25:41,617 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:25:41,617 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:25:41,618 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:25:41,618 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:25:41,618 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:25:41,618 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:25:41,618 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:25:41,619 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:25:41,619 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:25:41,619 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:25:41,619 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 [2019-11-07 01:25:41,887 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:25:41,901 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:25:41,904 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:25:41,906 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:25:41,906 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:25:41,907 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-11-07 01:25:41,991 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0af941173/19d1e0b9085c478eb2a44c1f12373fc0/FLAG08e837def [2019-11-07 01:25:42,475 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:25:42,476 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-11-07 01:25:42,486 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0af941173/19d1e0b9085c478eb2a44c1f12373fc0/FLAG08e837def [2019-11-07 01:25:42,829 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0af941173/19d1e0b9085c478eb2a44c1f12373fc0 [2019-11-07 01:25:42,840 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:25:42,842 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:25:42,843 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:25:42,843 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:25:42,847 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:25:42,848 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:25:42" (1/1) ... [2019-11-07 01:25:42,856 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4334376c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:42, skipping insertion in model container [2019-11-07 01:25:42,856 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:25:42" (1/1) ... [2019-11-07 01:25:42,864 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:25:42,885 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:25:43,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:25:43,054 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:25:43,077 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:25:43,098 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:25:43,099 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43 WrapperNode [2019-11-07 01:25:43,099 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:25:43,100 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:25:43,100 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:25:43,100 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:25:43,194 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (1/1) ... [2019-11-07 01:25:43,194 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (1/1) ... [2019-11-07 01:25:43,204 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (1/1) ... [2019-11-07 01:25:43,206 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (1/1) ... [2019-11-07 01:25:43,212 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (1/1) ... [2019-11-07 01:25:43,218 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (1/1) ... [2019-11-07 01:25:43,220 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (1/1) ... [2019-11-07 01:25:43,222 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:25:43,222 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:25:43,222 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:25:43,222 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:25:43,223 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (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 [2019-11-07 01:25:43,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:25:43,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:25:43,283 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:25:43,283 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:25:43,283 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:25:43,283 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:25:43,284 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:25:43,284 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:25:43,284 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:25:43,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:25:43,284 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:25:43,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:25:43,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:25:43,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:25:43,651 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:25:43,652 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 01:25:43,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:25:43 BoogieIcfgContainer [2019-11-07 01:25:43,653 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:25:43,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:25:43,654 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:25:43,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:25:43,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:25:42" (1/3) ... [2019-11-07 01:25:43,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@561e6f58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:25:43, skipping insertion in model container [2019-11-07 01:25:43,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:25:43" (2/3) ... [2019-11-07 01:25:43,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@561e6f58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:25:43, skipping insertion in model container [2019-11-07 01:25:43,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:25:43" (3/3) ... [2019-11-07 01:25:43,661 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2019-11-07 01:25:43,670 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:25:43,677 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:25:43,689 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:25:43,715 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:25:43,715 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:25:43,715 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:25:43,715 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:25:43,715 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:25:43,715 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:25:43,716 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:25:43,716 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:25:43,733 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-07 01:25:43,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:25:43,740 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:25:43,741 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:25:43,744 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:25:43,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:25:43,751 INFO L82 PathProgramCache]: Analyzing trace with hash -973561822, now seen corresponding path program 1 times [2019-11-07 01:25:43,761 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:25:43,761 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263886567] [2019-11-07 01:25:43,762 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:25:43,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:43,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:25:43,917 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263886567] [2019-11-07 01:25:43,917 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:25:43,918 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:25:43,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294613229] [2019-11-07 01:25:43,922 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:25:43,923 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:25:43,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:25:43,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:25:43,937 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-11-07 01:25:43,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:25:43,981 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2019-11-07 01:25:43,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:25:43,985 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 01:25:43,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:25:43,992 INFO L225 Difference]: With dead ends: 34 [2019-11-07 01:25:43,992 INFO L226 Difference]: Without dead ends: 18 [2019-11-07 01:25:43,996 INFO L630 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 [2019-11-07 01:25:44,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-07 01:25:44,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-07 01:25:44,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-07 01:25:44,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-11-07 01:25:44,039 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2019-11-07 01:25:44,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:25:44,040 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-11-07 01:25:44,040 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:25:44,040 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-11-07 01:25:44,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:25:44,041 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:25:44,041 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:25:44,042 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:25:44,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:25:44,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1894348460, now seen corresponding path program 1 times [2019-11-07 01:25:44,043 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:25:44,043 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103784280] [2019-11-07 01:25:44,043 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:25:44,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:44,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:25:44,106 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103784280] [2019-11-07 01:25:44,106 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839531381] [2019-11-07 01:25:44,107 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 [2019-11-07 01:25:44,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:44,175 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:25:44,183 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:25:44,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:25:44,228 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:25:44,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:25:44,276 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1221897501] [2019-11-07 01:25:44,308 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:25:44,309 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:25:44,325 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:25:44,337 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:25:44,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:25:44,486 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:25:44,832 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:25:44,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:25:44,847 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:25:45,170 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:25:45,171 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-11-07 01:25:45,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609887870] [2019-11-07 01:25:45,174 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 01:25:45,174 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:25:45,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 01:25:45,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2019-11-07 01:25:45,176 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 17 states. [2019-11-07 01:25:45,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:25:45,752 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2019-11-07 01:25:45,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-07 01:25:45,754 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 14 [2019-11-07 01:25:45,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:25:45,755 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:25:45,755 INFO L226 Difference]: Without dead ends: 31 [2019-11-07 01:25:45,759 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=150, Invalid=606, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:25:45,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-07 01:25:45,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 22. [2019-11-07 01:25:45,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 01:25:45,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-11-07 01:25:45,777 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 14 [2019-11-07 01:25:45,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:25:45,778 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-11-07 01:25:45,778 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 01:25:45,778 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-11-07 01:25:45,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-07 01:25:45,779 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:25:45,779 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:25:45,980 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:25:45,980 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:25:45,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:25:45,981 INFO L82 PathProgramCache]: Analyzing trace with hash -317151134, now seen corresponding path program 2 times [2019-11-07 01:25:45,981 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:25:45,982 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891913623] [2019-11-07 01:25:45,982 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:25:46,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:46,143 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:25:46,144 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891913623] [2019-11-07 01:25:46,145 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076525700] [2019-11-07 01:25:46,145 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 [2019-11-07 01:25:46,212 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:25:46,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:25:46,213 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:25:46,216 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:25:46,226 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:25:46,227 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:25:46,264 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:25:46,264 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1174327035] [2019-11-07 01:25:46,266 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:25:46,266 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:25:46,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:25:46,267 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:25:46,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:25:46,300 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:25:46,497 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:25:46,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:25:46,505 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:25:46,765 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:25:46,765 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 11] total 21 [2019-11-07 01:25:46,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582018166] [2019-11-07 01:25:46,767 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 01:25:46,767 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:25:46,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 01:25:46,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2019-11-07 01:25:46,768 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 21 states. [2019-11-07 01:25:47,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:25:47,472 INFO L93 Difference]: Finished difference Result 53 states and 66 transitions. [2019-11-07 01:25:47,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:25:47,473 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 18 [2019-11-07 01:25:47,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:25:47,474 INFO L225 Difference]: With dead ends: 53 [2019-11-07 01:25:47,474 INFO L226 Difference]: Without dead ends: 41 [2019-11-07 01:25:47,475 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2019-11-07 01:25:47,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-07 01:25:47,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2019-11-07 01:25:47,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:25:47,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-11-07 01:25:47,485 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 18 [2019-11-07 01:25:47,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:25:47,486 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-11-07 01:25:47,486 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-07 01:25:47,486 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-11-07 01:25:47,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:25:47,487 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:25:47,487 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:25:47,690 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:25:47,691 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:25:47,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:25:47,692 INFO L82 PathProgramCache]: Analyzing trace with hash -418739934, now seen corresponding path program 3 times [2019-11-07 01:25:47,692 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:25:47,692 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065901879] [2019-11-07 01:25:47,692 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:25:47,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:47,818 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-07 01:25:47,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065901879] [2019-11-07 01:25:47,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701435294] [2019-11-07 01:25:47,819 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 [2019-11-07 01:25:47,893 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:25:47,893 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:25:47,895 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:25:47,898 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:25:47,921 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-07 01:25:47,921 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:25:48,099 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-07 01:25:48,099 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099205959] [2019-11-07 01:25:48,101 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:25:48,101 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:25:48,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:25:48,102 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:25:48,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:25:48,126 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:25:48,231 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:25:48,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:25:48,237 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:25:48,527 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:25:48,527 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 31 [2019-11-07 01:25:48,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961927273] [2019-11-07 01:25:48,529 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-07 01:25:48,529 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:25:48,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-07 01:25:48,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=690, Unknown=0, NotChecked=0, Total=930 [2019-11-07 01:25:48,537 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 31 states. [2019-11-07 01:25:49,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:25:49,796 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2019-11-07 01:25:49,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-07 01:25:49,797 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 28 [2019-11-07 01:25:49,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:25:49,798 INFO L225 Difference]: With dead ends: 70 [2019-11-07 01:25:49,798 INFO L226 Difference]: Without dead ends: 52 [2019-11-07 01:25:49,800 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=745, Invalid=2335, Unknown=0, NotChecked=0, Total=3080 [2019-11-07 01:25:49,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-07 01:25:49,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 43. [2019-11-07 01:25:49,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-07 01:25:49,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2019-11-07 01:25:49,810 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 28 [2019-11-07 01:25:49,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:25:49,811 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2019-11-07 01:25:49,811 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-07 01:25:49,811 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2019-11-07 01:25:49,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-07 01:25:49,812 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:25:49,812 INFO L410 BasicCegarLoop]: trace histogram [18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:25:50,017 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:25:50,017 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:25:50,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:25:50,018 INFO L82 PathProgramCache]: Analyzing trace with hash 798654980, now seen corresponding path program 4 times [2019-11-07 01:25:50,019 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:25:50,022 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253138964] [2019-11-07 01:25:50,022 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:25:50,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:50,351 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-07 01:25:50,352 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253138964] [2019-11-07 01:25:50,352 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123428788] [2019-11-07 01:25:50,352 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 [2019-11-07 01:25:50,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:50,434 INFO L256 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-07 01:25:50,439 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:25:50,460 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-07 01:25:50,461 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:25:50,941 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-07 01:25:50,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2116117804] [2019-11-07 01:25:50,942 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:25:50,943 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:25:50,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:25:50,943 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:25:50,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:25:50,964 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:25:51,075 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:25:51,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:25:51,087 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:25:51,422 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:25:51,423 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 11] total 51 [2019-11-07 01:25:51,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132206440] [2019-11-07 01:25:51,424 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-11-07 01:25:51,424 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:25:51,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-11-07 01:25:51,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=850, Invalid=1700, Unknown=0, NotChecked=0, Total=2550 [2019-11-07 01:25:51,428 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 51 states. [2019-11-07 01:25:54,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:25:54,121 INFO L93 Difference]: Finished difference Result 101 states and 134 transitions. [2019-11-07 01:25:54,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-11-07 01:25:54,121 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 39 [2019-11-07 01:25:54,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:25:54,123 INFO L225 Difference]: With dead ends: 101 [2019-11-07 01:25:54,123 INFO L226 Difference]: Without dead ends: 82 [2019-11-07 01:25:54,128 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2615, Invalid=6505, Unknown=0, NotChecked=0, Total=9120 [2019-11-07 01:25:54,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-07 01:25:54,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 73. [2019-11-07 01:25:54,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-07 01:25:54,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2019-11-07 01:25:54,153 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 39 [2019-11-07 01:25:54,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:25:54,153 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2019-11-07 01:25:54,154 INFO L463 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-11-07 01:25:54,154 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2019-11-07 01:25:54,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-07 01:25:54,158 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:25:54,158 INFO L410 BasicCegarLoop]: trace histogram [38, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:25:54,361 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:25:54,361 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:25:54,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:25:54,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1517035324, now seen corresponding path program 5 times [2019-11-07 01:25:54,362 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:25:54,362 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616677515] [2019-11-07 01:25:54,363 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:25:54,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:25:55,405 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-11-07 01:25:55,406 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616677515] [2019-11-07 01:25:55,406 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094214093] [2019-11-07 01:25:55,406 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 [2019-11-07 01:26:11,577 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2019-11-07 01:26:11,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:11,587 INFO L256 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-07 01:26:11,590 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:11,609 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-11-07 01:26:11,609 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:12,576 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-11-07 01:26:12,576 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029391481] [2019-11-07 01:26:12,579 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:12,579 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:12,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:12,580 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:12,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:12,602 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:12,707 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:26:12,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:12,720 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:13,128 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:13,128 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 22, 22, 11] total 72 [2019-11-07 01:26:13,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977341296] [2019-11-07 01:26:13,129 INFO L442 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-11-07 01:26:13,129 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:13,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-11-07 01:26:13,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1921, Invalid=3191, Unknown=0, NotChecked=0, Total=5112 [2019-11-07 01:26:13,132 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 72 states. [2019-11-07 01:26:17,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:17,978 INFO L93 Difference]: Finished difference Result 172 states and 236 transitions. [2019-11-07 01:26:17,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-11-07 01:26:17,979 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 69 [2019-11-07 01:26:17,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:17,981 INFO L225 Difference]: With dead ends: 172 [2019-11-07 01:26:17,982 INFO L226 Difference]: Without dead ends: 143 [2019-11-07 01:26:17,988 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3619 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=5752, Invalid=13154, Unknown=0, NotChecked=0, Total=18906 [2019-11-07 01:26:17,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2019-11-07 01:26:18,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 134. [2019-11-07 01:26:18,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-11-07 01:26:18,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2019-11-07 01:26:18,006 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 69 [2019-11-07 01:26:18,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:18,007 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2019-11-07 01:26:18,007 INFO L463 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-11-07 01:26:18,007 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2019-11-07 01:26:18,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-11-07 01:26:18,009 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:18,009 INFO L410 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:18,209 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:18,210 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:18,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:18,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1462323180, now seen corresponding path program 6 times [2019-11-07 01:26:18,211 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:18,212 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795391198] [2019-11-07 01:26:18,212 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:18,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:20,147 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-11-07 01:26:20,147 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795391198] [2019-11-07 01:26:20,147 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577913289] [2019-11-07 01:26:20,148 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 [2019-11-07 01:26:20,313 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:26:20,313 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:20,317 INFO L256 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 61 conjunts are in the unsatisfiable core [2019-11-07 01:26:20,324 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:20,369 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-11-07 01:26:20,369 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:24,999 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-11-07 01:26:24,999 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [875870972] [2019-11-07 01:26:25,001 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:25,001 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:25,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:25,001 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:25,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:25,023 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:25,130 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:26:25,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:25,136 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:25,932 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:25,933 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62, 11] total 133 [2019-11-07 01:26:25,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514129903] [2019-11-07 01:26:25,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 133 states [2019-11-07 01:26:25,934 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:25,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2019-11-07 01:26:25,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7533, Invalid=10023, Unknown=0, NotChecked=0, Total=17556 [2019-11-07 01:26:25,946 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand 133 states.