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/nla-digbench/egcd2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:04:26,905 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:04:26,908 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:04:26,923 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:04:26,924 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:04:26,925 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:04:26,927 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:04:26,930 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:04:26,933 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:04:26,939 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:04:26,940 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:04:26,944 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:04:26,944 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:04:26,947 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:04:26,949 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:04:26,950 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:04:26,951 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:04:26,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:04:26,953 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:04:26,955 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:04:26,957 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:04:26,958 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:04:26,959 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:04:26,960 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:04:26,965 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 03:04:26,974 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 03:04:26,975 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 03:04:26,976 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 03:04:26,976 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 03:04:26,981 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 03:04:26,981 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 03:04:26,982 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 03:04:26,983 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 03:04:26,983 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:04:26,985 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:04:26,987 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:04:26,988 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 03:04:27,014 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:04:27,015 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:04:27,017 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:04:27,017 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:04:27,018 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:04:27,018 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:04:27,018 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:04:27,018 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:04:27,019 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:04:27,019 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:04:27,020 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:04:27,020 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:04:27,021 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:04:27,021 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:04:27,021 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:04:27,022 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:04:27,022 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:04:27,022 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:04:27,022 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:04:27,023 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:04:27,023 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:04:27,023 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:04:27,024 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:04:27,024 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:04:27,024 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:04:27,024 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:04:27,024 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:04:27,025 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:04:27,025 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 03:04:27,386 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:04:27,413 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:04:27,418 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:04:27,421 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:04:27,421 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:04:27,422 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/egcd2.c [2019-10-15 03:04:27,511 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c695d435/9a4e7992a3224b02996792023348b947/FLAG5842cda4e [2019-10-15 03:04:28,074 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:04:28,075 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/egcd2.c [2019-10-15 03:04:28,086 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c695d435/9a4e7992a3224b02996792023348b947/FLAG5842cda4e [2019-10-15 03:04:28,376 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c695d435/9a4e7992a3224b02996792023348b947 [2019-10-15 03:04:28,389 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:04:28,390 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:04:28,391 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:28,392 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:04:28,401 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:04:28,402 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,406 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69137f33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28, skipping insertion in model container [2019-10-15 03:04:28,406 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,414 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:04:28,440 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:04:28,685 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:28,694 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:04:28,719 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:28,736 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:04:28,736 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28 WrapperNode [2019-10-15 03:04:28,737 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:28,737 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:04:28,738 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:04:28,738 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:04:28,851 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,851 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,857 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,858 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,864 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,870 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,872 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... [2019-10-15 03:04:28,876 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:04:28,877 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:04:28,877 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:04:28,878 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:04:28,879 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:04:28,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:04:28,943 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:04:28,944 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:04:28,944 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:04:28,944 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:04:28,945 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 03:04:28,946 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 03:04:28,946 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:04:28,947 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:04:28,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:04:28,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:04:29,249 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:04:29,249 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 03:04:29,251 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:29 BoogieIcfgContainer [2019-10-15 03:04:29,251 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:04:29,252 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:04:29,252 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:04:29,256 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:04:29,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:04:28" (1/3) ... [2019-10-15 03:04:29,257 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@446a42e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:29, skipping insertion in model container [2019-10-15 03:04:29,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:28" (2/3) ... [2019-10-15 03:04:29,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@446a42e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:29, skipping insertion in model container [2019-10-15 03:04:29,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:29" (3/3) ... [2019-10-15 03:04:29,262 INFO L109 eAbstractionObserver]: Analyzing ICFG egcd2.c [2019-10-15 03:04:29,287 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:04:29,306 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:04:29,326 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:04:29,400 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:04:29,402 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:04:29,402 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:04:29,403 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:04:29,403 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:04:29,403 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:04:29,403 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:04:29,403 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:04:29,425 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-10-15 03:04:29,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-15 03:04:29,431 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:29,431 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:29,433 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:29,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:29,440 INFO L82 PathProgramCache]: Analyzing trace with hash -526924454, now seen corresponding path program 1 times [2019-10-15 03:04:29,449 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:29,449 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84561009] [2019-10-15 03:04:29,450 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:29,450 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:29,450 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:29,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:29,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:29,584 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84561009] [2019-10-15 03:04:29,585 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:29,586 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 03:04:29,586 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276470805] [2019-10-15 03:04:29,590 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 03:04:29,591 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:29,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 03:04:29,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:04:29,607 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-10-15 03:04:29,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:29,644 INFO L93 Difference]: Finished difference Result 47 states and 71 transitions. [2019-10-15 03:04:29,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 03:04:29,647 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-10-15 03:04:29,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:29,661 INFO L225 Difference]: With dead ends: 47 [2019-10-15 03:04:29,661 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 03:04:29,668 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:04:29,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 03:04:29,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 03:04:29,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 03:04:29,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2019-10-15 03:04:29,729 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 10 [2019-10-15 03:04:29,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:29,729 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2019-10-15 03:04:29,730 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 03:04:29,730 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2019-10-15 03:04:29,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 03:04:29,731 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:29,731 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:29,731 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:29,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:29,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1008536757, now seen corresponding path program 1 times [2019-10-15 03:04:29,732 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:29,733 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560386036] [2019-10-15 03:04:29,733 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:29,733 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:29,733 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:29,745 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 03:04:29,746 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [763510180] [2019-10-15 03:04:29,746 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:29,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:29,815 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 03:04:29,821 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:29,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:29,859 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:29,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:29,902 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560386036] [2019-10-15 03:04:29,902 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 03:04:29,902 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763510180] [2019-10-15 03:04:29,903 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:29,903 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2019-10-15 03:04:29,903 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667707535] [2019-10-15 03:04:29,905 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:04:29,905 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:29,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:04:29,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:04:29,906 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 3 states. [2019-10-15 03:04:29,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:29,958 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2019-10-15 03:04:29,958 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:04:29,959 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-10-15 03:04:29,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:29,960 INFO L225 Difference]: With dead ends: 39 [2019-10-15 03:04:29,960 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 03:04:29,961 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 19 SyntacticMatches, 1 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 03:04:29,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 03:04:29,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2019-10-15 03:04:29,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 03:04:29,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2019-10-15 03:04:29,978 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 11 [2019-10-15 03:04:29,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:29,979 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2019-10-15 03:04:29,979 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:04:29,979 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2019-10-15 03:04:29,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 03:04:29,980 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:29,980 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:30,185 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:30,194 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:30,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:30,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1182801044, now seen corresponding path program 1 times [2019-10-15 03:04:30,194 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:30,195 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877859370] [2019-10-15 03:04:30,195 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:30,195 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:30,196 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:30,215 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 03:04:30,215 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [20640673] [2019-10-15 03:04:30,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:30,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:30,257 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-15 03:04:30,259 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:30,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:30,310 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:30,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:30,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877859370] [2019-10-15 03:04:30,384 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 03:04:30,385 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20640673] [2019-10-15 03:04:30,385 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:30,385 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2019-10-15 03:04:30,385 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320583716] [2019-10-15 03:04:30,386 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-15 03:04:30,386 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:30,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-15 03:04:30,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-10-15 03:04:30,387 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand 7 states. [2019-10-15 03:04:30,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:30,543 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-10-15 03:04:30,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 03:04:30,544 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2019-10-15 03:04:30,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:30,545 INFO L225 Difference]: With dead ends: 37 [2019-10-15 03:04:30,545 INFO L226 Difference]: Without dead ends: 35 [2019-10-15 03:04:30,546 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-15 03:04:30,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-15 03:04:30,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2019-10-15 03:04:30,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 03:04:30,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2019-10-15 03:04:30,564 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 12 [2019-10-15 03:04:30,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:30,565 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2019-10-15 03:04:30,565 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-15 03:04:30,565 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2019-10-15 03:04:30,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 03:04:30,566 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:30,566 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:30,779 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:30,780 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:30,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:30,780 INFO L82 PathProgramCache]: Analyzing trace with hash -2031293851, now seen corresponding path program 1 times [2019-10-15 03:04:30,781 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:30,781 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465056836] [2019-10-15 03:04:30,782 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:30,782 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:30,782 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:30,791 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 03:04:30,791 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [871523879] [2019-10-15 03:04:30,791 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:30,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:30,830 INFO L256 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-15 03:04:30,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:30,893 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:30,893 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:30,977 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:30,978 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465056836] [2019-10-15 03:04:30,978 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 03:04:30,978 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871523879] [2019-10-15 03:04:30,979 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:30,979 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-10-15 03:04:30,979 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638567369] [2019-10-15 03:04:30,980 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-15 03:04:30,980 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:30,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-15 03:04:30,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-10-15 03:04:30,981 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand 8 states. [2019-10-15 03:04:31,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:31,112 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2019-10-15 03:04:31,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 03:04:31,113 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2019-10-15 03:04:31,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:31,119 INFO L225 Difference]: With dead ends: 45 [2019-10-15 03:04:31,119 INFO L226 Difference]: Without dead ends: 43 [2019-10-15 03:04:31,122 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-15 03:04:31,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-15 03:04:31,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2019-10-15 03:04:31,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-15 03:04:31,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 53 transitions. [2019-10-15 03:04:31,146 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 53 transitions. Word has length 17 [2019-10-15 03:04:31,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:31,146 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 53 transitions. [2019-10-15 03:04:31,146 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-15 03:04:31,146 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 53 transitions. [2019-10-15 03:04:31,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-15 03:04:31,147 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:31,149 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:31,353 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:31,354 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:31,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:31,355 INFO L82 PathProgramCache]: Analyzing trace with hash -71864628, now seen corresponding path program 1 times [2019-10-15 03:04:31,355 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:31,356 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230959760] [2019-10-15 03:04:31,356 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:31,357 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:31,357 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:31,376 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 03:04:31,377 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1969719343] [2019-10-15 03:04:31,377 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -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 03:04:31,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:31,422 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-15 03:04:31,424 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:31,478 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 03:04:31,479 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:31,532 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 03:04:31,533 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230959760] [2019-10-15 03:04:31,533 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 03:04:31,533 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969719343] [2019-10-15 03:04:31,534 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:31,534 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-10-15 03:04:31,534 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466813466] [2019-10-15 03:04:31,535 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-15 03:04:31,536 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:31,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-15 03:04:31,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-10-15 03:04:31,537 INFO L87 Difference]: Start difference. First operand 42 states and 53 transitions. Second operand 8 states. [2019-10-15 03:04:31,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:31,648 INFO L93 Difference]: Finished difference Result 49 states and 59 transitions. [2019-10-15 03:04:31,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 03:04:31,649 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2019-10-15 03:04:31,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:31,651 INFO L225 Difference]: With dead ends: 49 [2019-10-15 03:04:31,651 INFO L226 Difference]: Without dead ends: 47 [2019-10-15 03:04:31,652 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-15 03:04:31,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-15 03:04:31,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-10-15 03:04:31,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-15 03:04:31,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2019-10-15 03:04:31,663 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 22 [2019-10-15 03:04:31,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:31,664 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2019-10-15 03:04:31,664 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-15 03:04:31,664 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2019-10-15 03:04:31,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-15 03:04:31,666 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:31,666 INFO L380 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:31,879 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:31,880 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:31,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:31,880 INFO L82 PathProgramCache]: Analyzing trace with hash 954332139, now seen corresponding path program 1 times [2019-10-15 03:04:31,881 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:31,881 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387741208] [2019-10-15 03:04:31,882 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:31,882 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:31,882 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:31,890 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 03:04:31,891 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1884091852] [2019-10-15 03:04:31,891 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -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 03:04:31,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:31,959 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-15 03:04:31,961 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:32,003 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 03:04:32,003 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:32,080 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 03:04:32,080 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387741208] [2019-10-15 03:04:32,080 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 03:04:32,081 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884091852] [2019-10-15 03:04:32,081 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053114497] [2019-10-15 03:04:32,126 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:04:32,126 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:32,132 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:32,141 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:32,142 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:32,199 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:04:40,045 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 9 [2019-10-15 03:04:42,273 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-10-15 03:04:42,289 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:04:42,294 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:42,909 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 03:04:42,909 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9] total 17 [2019-10-15 03:04:42,909 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036135774] [2019-10-15 03:04:42,911 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-15 03:04:42,911 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:42,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-15 03:04:42,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2019-10-15 03:04:42,912 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand 17 states. [2019-10-15 03:04:43,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:43,798 INFO L93 Difference]: Finished difference Result 75 states and 103 transitions. [2019-10-15 03:04:43,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-15 03:04:43,800 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2019-10-15 03:04:43,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:43,803 INFO L225 Difference]: With dead ends: 75 [2019-10-15 03:04:43,803 INFO L226 Difference]: Without dead ends: 73 [2019-10-15 03:04:43,804 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 82 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2019-10-15 03:04:43,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-10-15 03:04:43,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 48. [2019-10-15 03:04:43,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-15 03:04:43,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2019-10-15 03:04:43,826 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 34 [2019-10-15 03:04:43,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:43,826 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2019-10-15 03:04:43,826 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-15 03:04:43,827 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2019-10-15 03:04:43,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-15 03:04:43,828 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:43,828 INFO L380 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:44,029 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:44,029 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:44,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:44,030 INFO L82 PathProgramCache]: Analyzing trace with hash 286726549, now seen corresponding path program 1 times [2019-10-15 03:04:44,030 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:44,031 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683014373] [2019-10-15 03:04:44,031 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:44,031 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:44,032 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:44,042 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 03:04:44,042 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [867921742] [2019-10-15 03:04:44,043 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -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 03:04:44,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:44,169 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 03:04:44,172 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:44,191 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 03:04:44,192 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:44,287 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 03:04:44,289 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683014373] [2019-10-15 03:04:44,289 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 03:04:44,290 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867921742] [2019-10-15 03:04:44,291 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19567932] [2019-10-15 03:04:44,294 INFO L162 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-10-15 03:04:44,294 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:44,295 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:44,295 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:44,295 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:44,315 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:04:51,463 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-10-15 03:04:51,484 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:04:51,485 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:51,830 WARN L191 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 35 [2019-10-15 03:04:52,375 WARN L191 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 48 [2019-10-15 03:04:52,523 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 34 [2019-10-15 03:04:52,547 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 03:04:52,547 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 10] total 13 [2019-10-15 03:04:52,547 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910228635] [2019-10-15 03:04:52,548 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-15 03:04:52,549 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:52,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-15 03:04:52,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2019-10-15 03:04:52,549 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand 13 states. [2019-10-15 03:04:52,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:52,930 INFO L93 Difference]: Finished difference Result 102 states and 145 transitions. [2019-10-15 03:04:52,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-15 03:04:52,931 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2019-10-15 03:04:52,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:52,934 INFO L225 Difference]: With dead ends: 102 [2019-10-15 03:04:52,934 INFO L226 Difference]: Without dead ends: 94 [2019-10-15 03:04:52,935 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 88 SyntacticMatches, 8 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=70, Invalid=170, Unknown=0, NotChecked=0, Total=240 [2019-10-15 03:04:52,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-15 03:04:52,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 76. [2019-10-15 03:04:52,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-15 03:04:52,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 106 transitions. [2019-10-15 03:04:52,952 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 106 transitions. Word has length 36 [2019-10-15 03:04:52,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:52,952 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 106 transitions. [2019-10-15 03:04:52,953 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-15 03:04:52,953 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 106 transitions. [2019-10-15 03:04:52,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-15 03:04:52,954 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:52,954 INFO L380 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:53,157 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:53,157 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:53,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:53,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1803964113, now seen corresponding path program 1 times [2019-10-15 03:04:53,158 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:53,159 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472133576] [2019-10-15 03:04:53,159 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:53,159 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:53,160 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:53,172 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 03:04:53,172 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [431085260] [2019-10-15 03:04:53,173 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -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 03:04:53,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:53,339 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-15 03:04:53,341 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:53,393 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-15 03:04:53,393 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:53,471 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-15 03:04:53,471 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472133576] [2019-10-15 03:04:53,472 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 03:04:53,472 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431085260] [2019-10-15 03:04:53,472 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1240769885] [2019-10-15 03:04:53,474 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 03:04:53,474 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:53,474 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:53,475 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:53,475 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:53,486 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:04:58,702 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-10-15 03:04:58,720 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:04:58,721 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:59,088 WARN L191 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 35 [2019-10-15 03:05:01,895 WARN L191 SmtUtils]: Spent 2.55 s on a formula simplification. DAG size of input: 104 DAG size of output: 46 [2019-10-15 03:05:02,086 WARN L191 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 34 [2019-10-15 03:05:02,153 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 03:05:02,153 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9] total 18 [2019-10-15 03:05:02,153 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613278149] [2019-10-15 03:05:02,154 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 03:05:02,155 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:05:02,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 03:05:02,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2019-10-15 03:05:02,156 INFO L87 Difference]: Start difference. First operand 76 states and 106 transitions. Second operand 18 states. [2019-10-15 03:05:02,280 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 34 [2019-10-15 03:05:02,439 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 34 [2019-10-15 03:05:04,794 WARN L191 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 40 DAG size of output: 34