java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:01:06,881 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:01:06,883 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:01:06,907 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:01:06,907 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:01:06,908 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:01:06,911 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:01:06,913 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:01:06,914 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:01:06,915 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:01:06,916 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:01:06,917 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:01:06,918 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:01:06,919 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:01:06,920 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:01:06,921 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:01:06,922 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:01:06,923 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:01:06,925 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:01:06,926 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:01:06,928 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:01:06,931 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:01:06,932 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:01:06,933 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:01:06,939 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 03:01:06,955 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:01:06,956 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:01:06,961 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:01:06,962 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 03:01:06,976 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:01:06,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:01:06,978 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:01:06,978 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:01:06,978 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:01:06,978 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:01:06,979 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:01:06,979 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:01:06,979 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:01:06,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:01:06,979 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:01:06,980 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:01:06,980 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:01:06,980 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:01:06,980 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:01:06,980 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:01:06,981 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:01:06,981 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:01:06,981 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:01:06,981 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:01:06,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:01:06,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:01:06,982 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:01:06,982 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:01:06,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:01:06,982 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:01:06,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:01:06,983 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:01:06,983 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 03:01:07,266 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:01:07,281 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:01:07,286 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:01:07,287 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:01:07,288 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:01:07,288 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-10-15 03:01:07,359 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/393c96f14/15c0ea5580cc4f3bb6d0f03f23bded30/FLAG556975807 [2019-10-15 03:01:07,819 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:01:07,820 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-10-15 03:01:07,826 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/393c96f14/15c0ea5580cc4f3bb6d0f03f23bded30/FLAG556975807 [2019-10-15 03:01:08,202 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/393c96f14/15c0ea5580cc4f3bb6d0f03f23bded30 [2019-10-15 03:01:08,210 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:01:08,212 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:01:08,214 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:01:08,214 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:01:08,217 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:01:08,218 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,221 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ebafe9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08, skipping insertion in model container [2019-10-15 03:01:08,222 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,230 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:01:08,248 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:01:08,447 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:01:08,458 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:01:08,483 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:01:08,498 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:01:08,499 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08 WrapperNode [2019-10-15 03:01:08,499 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:01:08,500 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:01:08,500 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:01:08,500 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:01:08,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,606 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,608 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,611 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,616 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,617 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (1/1) ... [2019-10-15 03:01:08,618 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:01:08,619 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:01:08,619 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:01:08,619 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:01:08,620 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (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 03:01:08,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:01:08,680 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:01:08,680 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:01:08,680 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:01:08,680 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:01:08,680 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:01:08,680 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:01:08,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:01:08,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:01:08,885 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:01:08,885 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 03:01:08,886 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:01:08 BoogieIcfgContainer [2019-10-15 03:01:08,886 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:01:08,887 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:01:08,888 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:01:08,890 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:01:08,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:01:08" (1/3) ... [2019-10-15 03:01:08,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@457f9da9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:01:08, skipping insertion in model container [2019-10-15 03:01:08,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:08" (2/3) ... [2019-10-15 03:01:08,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@457f9da9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:01:08, skipping insertion in model container [2019-10-15 03:01:08,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:01:08" (3/3) ... [2019-10-15 03:01:08,894 INFO L109 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2019-10-15 03:01:08,903 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:01:08,910 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:01:08,919 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:01:08,951 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:01:08,951 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:01:08,952 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:01:08,952 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:01:08,952 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:01:08,953 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:01:08,953 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:01:08,953 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:01:08,968 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-10-15 03:01:08,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-15 03:01:08,973 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:08,973 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:08,975 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:08,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:08,979 INFO L82 PathProgramCache]: Analyzing trace with hash -838692905, now seen corresponding path program 1 times [2019-10-15 03:01:08,986 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:08,987 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91798181] [2019-10-15 03:01:08,987 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:08,987 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:08,987 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:09,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:09,172 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 03:01:09,172 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91798181] [2019-10-15 03:01:09,173 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:01:09,174 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:01:09,174 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709173482] [2019-10-15 03:01:09,179 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:01:09,179 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:09,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:01:09,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:01:09,197 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2019-10-15 03:01:09,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:09,282 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-10-15 03:01:09,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:01:09,284 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-10-15 03:01:09,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:09,293 INFO L225 Difference]: With dead ends: 31 [2019-10-15 03:01:09,293 INFO L226 Difference]: Without dead ends: 14 [2019-10-15 03:01:09,307 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 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 03:01:09,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-15 03:01:09,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-10-15 03:01:09,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-10-15 03:01:09,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-10-15 03:01:09,365 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-10-15 03:01:09,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:09,366 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-10-15 03:01:09,366 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:01:09,366 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-10-15 03:01:09,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 03:01:09,367 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:09,367 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:09,368 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:09,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:09,368 INFO L82 PathProgramCache]: Analyzing trace with hash -284821231, now seen corresponding path program 1 times [2019-10-15 03:01:09,368 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:09,369 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945354792] [2019-10-15 03:01:09,369 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:09,369 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:09,370 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:09,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:09,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:01:09,446 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945354792] [2019-10-15 03:01:09,446 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:01:09,447 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:01:09,447 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166684777] [2019-10-15 03:01:09,449 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:01:09,449 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:09,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:01:09,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:01:09,450 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2019-10-15 03:01:09,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:09,477 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2019-10-15 03:01:09,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:01:09,478 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 03:01:09,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:09,479 INFO L225 Difference]: With dead ends: 21 [2019-10-15 03:01:09,479 INFO L226 Difference]: Without dead ends: 14 [2019-10-15 03:01:09,481 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:01:09,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-15 03:01:09,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-10-15 03:01:09,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-15 03:01:09,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-10-15 03:01:09,488 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2019-10-15 03:01:09,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:09,488 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-10-15 03:01:09,488 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:01:09,489 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-10-15 03:01:09,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 03:01:09,489 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:09,490 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:09,490 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:09,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:09,490 INFO L82 PathProgramCache]: Analyzing trace with hash -147777241, now seen corresponding path program 1 times [2019-10-15 03:01:09,491 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:09,491 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951928861] [2019-10-15 03:01:09,491 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:09,491 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:09,491 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:09,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:09,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:01:09,610 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951928861] [2019-10-15 03:01:09,610 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661741317] [2019-10-15 03:01:09,610 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 03:01:09,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:09,653 INFO L256 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-15 03:01:09,659 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:01:09,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:01:09,728 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:01:09,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:01:09,794 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1287818779] [2019-10-15 03:01:09,816 INFO L162 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-10-15 03:01:09,816 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:01:09,827 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:01:09,835 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:01:09,836 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:01:09,894 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:01:10,342 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2019-10-15 03:01:10,364 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:01:10,369 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:01:10,646 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:01:10,646 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4, 7] total 15 [2019-10-15 03:01:10,646 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076005172] [2019-10-15 03:01:10,648 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-15 03:01:10,648 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:10,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-15 03:01:10,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2019-10-15 03:01:10,649 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 15 states. [2019-10-15 03:01:11,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:11,225 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2019-10-15 03:01:11,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-15 03:01:11,226 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 13 [2019-10-15 03:01:11,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:11,227 INFO L225 Difference]: With dead ends: 35 [2019-10-15 03:01:11,227 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 03:01:11,232 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=192, Invalid=620, Unknown=0, NotChecked=0, Total=812 [2019-10-15 03:01:11,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 03:01:11,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-10-15 03:01:11,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 03:01:11,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2019-10-15 03:01:11,243 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 13 [2019-10-15 03:01:11,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:11,243 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2019-10-15 03:01:11,243 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-15 03:01:11,244 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2019-10-15 03:01:11,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 03:01:11,245 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:11,246 INFO L380 BasicCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:11,449 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:11,450 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:11,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:11,450 INFO L82 PathProgramCache]: Analyzing trace with hash 689631679, now seen corresponding path program 2 times [2019-10-15 03:01:11,451 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:11,451 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671231279] [2019-10-15 03:01:11,451 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:11,451 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:11,452 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:11,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:11,562 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 03:01:11,563 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671231279] [2019-10-15 03:01:11,563 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526158878] [2019-10-15 03:01:11,563 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:11,618 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-15 03:01:11,619 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:01:11,620 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 03:01:11,623 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:01:11,647 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 03:01:11,647 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:01:11,689 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 03:01:11,689 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678092765] [2019-10-15 03:01:11,691 INFO L162 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-10-15 03:01:11,691 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:01:11,692 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:01:11,692 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:01:11,692 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:01:11,710 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:01:11,985 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 87 for LOIs [2019-10-15 03:01:11,995 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:01:11,997 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:01:12,225 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:01:12,225 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 7] total 15 [2019-10-15 03:01:12,225 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441236089] [2019-10-15 03:01:12,226 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-15 03:01:12,227 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:12,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-15 03:01:12,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2019-10-15 03:01:12,227 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 15 states. [2019-10-15 03:01:14,382 WARN L191 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 18 [2019-10-15 03:01:14,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:14,525 INFO L93 Difference]: Finished difference Result 61 states and 84 transitions. [2019-10-15 03:01:14,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-15 03:01:14,525 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 26 [2019-10-15 03:01:14,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:14,526 INFO L225 Difference]: With dead ends: 61 [2019-10-15 03:01:14,526 INFO L226 Difference]: Without dead ends: 43 [2019-10-15 03:01:14,527 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=114, Invalid=348, Unknown=0, NotChecked=0, Total=462 [2019-10-15 03:01:14,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-15 03:01:14,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-10-15 03:01:14,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-15 03:01:14,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2019-10-15 03:01:14,537 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 26 [2019-10-15 03:01:14,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:14,538 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2019-10-15 03:01:14,538 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-15 03:01:14,538 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2019-10-15 03:01:14,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-15 03:01:14,539 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:14,540 INFO L380 BasicCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:14,751 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:14,752 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:14,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:14,752 INFO L82 PathProgramCache]: Analyzing trace with hash -690259521, now seen corresponding path program 3 times [2019-10-15 03:01:14,752 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:14,753 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263168734] [2019-10-15 03:01:14,753 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:14,753 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:14,753 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:14,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:14,910 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2019-10-15 03:01:14,911 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263168734] [2019-10-15 03:01:14,911 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251986778] [2019-10-15 03:01:14,912 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:14,992 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 03:01:14,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:01:14,994 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-15 03:01:15,001 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:01:15,201 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-15 03:01:15,201 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:01:15,568 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 10 proven. 314 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-15 03:01:15,569 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39878166] [2019-10-15 03:01:15,571 INFO L162 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-10-15 03:01:15,571 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:01:15,571 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:01:15,572 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:01:15,572 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:01:15,584 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:01:15,770 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 58 for LOIs [2019-10-15 03:01:15,777 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:01:15,779 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:01:16,270 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:01:16,271 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12, 7] total 35 [2019-10-15 03:01:16,271 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525116147] [2019-10-15 03:01:16,272 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-15 03:01:16,272 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:16,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-15 03:01:16,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=983, Unknown=0, NotChecked=0, Total=1190 [2019-10-15 03:01:16,274 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 35 states. [2019-10-15 03:01:20,215 WARN L191 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 35 DAG size of output: 24 [2019-10-15 03:01:26,521 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 14 [2019-10-15 03:01:30,774 WARN L191 SmtUtils]: Spent 4.16 s on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2019-10-15 03:01:31,241 WARN L191 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2019-10-15 03:01:34,271 WARN L191 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 24 DAG size of output: 15 [2019-10-15 03:01:39,966 WARN L191 SmtUtils]: Spent 2.09 s on a formula simplification. DAG size of input: 36 DAG size of output: 25 [2019-10-15 03:01:47,275 WARN L191 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 35 DAG size of output: 27 [2019-10-15 03:01:49,479 WARN L191 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 27 [2019-10-15 03:01:52,455 WARN L191 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 39 DAG size of output: 28