java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:50:18,180 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:50:18,182 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:50:18,194 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:50:18,194 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:50:18,195 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:50:18,196 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:50:18,198 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:50:18,200 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:50:18,201 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:50:18,202 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:50:18,202 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:50:18,203 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:50:18,204 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:50:18,207 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:50:18,211 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:50:18,212 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:50:18,217 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:50:18,220 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:50:18,225 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:50:18,227 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:50:18,228 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:50:18,230 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 11:50:18,241 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-24 11:50:18,270 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:50:18,270 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:50:18,271 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:50:18,272 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:50:18,272 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:50:18,273 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:50:18,273 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:50:18,273 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:50:18,273 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:50:18,273 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:50:18,274 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:50:18,274 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:50:18,274 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:50:18,274 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:50:18,274 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:50:18,274 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:50:18,276 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:50:18,276 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:50:18,276 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:50:18,277 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:50:18,277 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:50:18,277 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:50:18,277 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:50:18,277 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:50:18,277 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:50:18,278 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:50:18,278 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:50:18,278 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:50:18,325 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:50:18,339 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:50:18,343 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:50:18,344 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:50:18,345 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:50:18,346 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-24 11:50:18,403 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/477e48efd/32a10a88660c4700ad58a024a6e51309/FLAG8abf15191 [2018-10-24 11:50:18,807 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:50:18,807 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-24 11:50:18,814 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/477e48efd/32a10a88660c4700ad58a024a6e51309/FLAG8abf15191 [2018-10-24 11:50:18,828 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/477e48efd/32a10a88660c4700ad58a024a6e51309 [2018-10-24 11:50:18,837 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:50:18,839 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:50:18,840 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:50:18,840 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:50:18,844 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:50:18,845 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:50:18" (1/1) ... [2018-10-24 11:50:18,848 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a802b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:18, skipping insertion in model container [2018-10-24 11:50:18,848 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:50:18" (1/1) ... [2018-10-24 11:50:18,859 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:50:18,882 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:50:19,076 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:50:19,083 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:50:19,100 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:50:19,119 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:50:19,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19 WrapperNode [2018-10-24 11:50:19,119 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:50:19,121 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:50:19,121 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:50:19,121 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:50:19,132 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,138 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,159 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:50:19,159 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:50:19,160 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:50:19,160 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:50:19,170 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,171 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,171 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,172 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,178 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,178 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... [2018-10-24 11:50:19,180 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:50:19,180 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:50:19,181 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:50:19,181 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:50:19,182 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 11:50:19,309 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:50:19,310 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:50:19,604 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:50:19,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:50:19 BoogieIcfgContainer [2018-10-24 11:50:19,606 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:50:19,607 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:50:19,607 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:50:19,610 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:50:19,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:50:18" (1/3) ... [2018-10-24 11:50:19,612 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34ddb45f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:50:19, skipping insertion in model container [2018-10-24 11:50:19,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:19" (2/3) ... [2018-10-24 11:50:19,612 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34ddb45f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:50:19, skipping insertion in model container [2018-10-24 11:50:19,613 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:50:19" (3/3) ... [2018-10-24 11:50:19,616 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call4.i [2018-10-24 11:50:19,627 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:50:19,634 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:50:19,650 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:50:19,684 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:50:19,685 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:50:19,685 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:50:19,686 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:50:19,686 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:50:19,686 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:50:19,686 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:50:19,686 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:50:19,686 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:50:19,701 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-24 11:50:19,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:50:19,707 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:19,708 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:50:19,710 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:19,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:19,717 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-24 11:50:19,719 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:19,720 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:19,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:19,766 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:19,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:19,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:19,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:19,826 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:50:19,826 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:50:19,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:50:19,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:50:19,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:50:19,844 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-24 11:50:19,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:19,858 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-24 11:50:19,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:50:19,860 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:50:19,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:19,871 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:50:19,871 INFO L226 Difference]: Without dead ends: 8 [2018-10-24 11:50:19,875 INFO L605 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 [2018-10-24 11:50:19,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-24 11:50:19,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-24 11:50:19,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-24 11:50:19,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-24 11:50:19,907 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-24 11:50:19,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:19,907 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-24 11:50:19,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:50:19,908 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-24 11:50:19,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:50:19,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:19,908 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:19,909 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:19,909 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:19,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-24 11:50:19,910 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:19,910 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:19,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:19,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:19,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:19,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:20,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:20,050 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:50:20,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 11:50:20,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 11:50:20,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 11:50:20,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:50:20,055 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-24 11:50:20,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:20,133 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-24 11:50:20,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 11:50:20,133 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-24 11:50:20,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:20,134 INFO L225 Difference]: With dead ends: 14 [2018-10-24 11:50:20,134 INFO L226 Difference]: Without dead ends: 10 [2018-10-24 11:50:20,136 INFO L605 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 [2018-10-24 11:50:20,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-24 11:50:20,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-24 11:50:20,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-24 11:50:20,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-24 11:50:20,141 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-24 11:50:20,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:20,142 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-24 11:50:20,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 11:50:20,142 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-24 11:50:20,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-24 11:50:20,143 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:20,143 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:20,143 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:20,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:20,144 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-24 11:50:20,144 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:20,144 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:20,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:20,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:20,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:20,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:20,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:20,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:20,290 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:20,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:20,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:20,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:20,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:20,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-24 11:50:20,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 11:50:20,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 11:50:20,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:50:20,388 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-24 11:50:20,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:20,446 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-24 11:50:20,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 11:50:20,447 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-24 11:50:20,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:20,448 INFO L225 Difference]: With dead ends: 16 [2018-10-24 11:50:20,448 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:50:20,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:50:20,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:50:20,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 11:50:20,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 11:50:20,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-24 11:50:20,454 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-24 11:50:20,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:20,456 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-24 11:50:20,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 11:50:20,456 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-24 11:50:20,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 11:50:20,456 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:20,457 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:20,457 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:20,457 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:20,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-24 11:50:20,459 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:20,460 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:20,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:20,461 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:20,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:20,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:20,606 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:20,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:20,606 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:20,616 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:50:20,629 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:50:20,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:20,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:20,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:20,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:20,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:50:20,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:50:20,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:50:20,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:50:20,695 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-24 11:50:20,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:20,837 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-24 11:50:20,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:50:20,838 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-24 11:50:20,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:20,838 INFO L225 Difference]: With dead ends: 18 [2018-10-24 11:50:20,839 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 11:50:20,839 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:50:20,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 11:50:20,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 11:50:20,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 11:50:20,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 11:50:20,843 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 11:50:20,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:20,844 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 11:50:20,844 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:50:20,844 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 11:50:20,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:50:20,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:20,846 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:20,846 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:20,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:20,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-24 11:50:20,847 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:20,847 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:20,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:20,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:20,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:20,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:21,008 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:21,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:21,008 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:21,025 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:50:21,071 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 11:50:21,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:21,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:21,095 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:21,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:21,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-24 11:50:21,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 11:50:21,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 11:50:21,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:50:21,117 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-24 11:50:21,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:21,252 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-24 11:50:21,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 11:50:21,253 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-24 11:50:21,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:21,254 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:50:21,254 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 11:50:21,255 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:50:21,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 11:50:21,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 11:50:21,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 11:50:21,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 11:50:21,261 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-24 11:50:21,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:21,261 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 11:50:21,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 11:50:21,261 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 11:50:21,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 11:50:21,263 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:21,263 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:21,263 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:21,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:21,265 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-24 11:50:21,266 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:21,266 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:21,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:21,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:21,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:21,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:21,440 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:21,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:21,441 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:21,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:50:21,485 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:50:21,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:21,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:21,555 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:21,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:21,576 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-24 11:50:21,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:50:21,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:50:21,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:50:21,578 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-24 11:50:21,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:21,633 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-24 11:50:21,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:50:21,634 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-24 11:50:21,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:21,636 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:50:21,636 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:50:21,636 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:50:21,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:50:21,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 11:50:21,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 11:50:21,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 11:50:21,641 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-24 11:50:21,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:21,641 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 11:50:21,641 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:50:21,641 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 11:50:21,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 11:50:21,642 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:21,642 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:21,643 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:21,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:21,643 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-24 11:50:21,643 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:21,643 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:21,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:21,645 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:21,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:21,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:21,943 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:21,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:21,943 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:21,957 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:50:22,131 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-24 11:50:22,132 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:22,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:22,160 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:22,181 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:22,181 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-24 11:50:22,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:50:22,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:50:22,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:50:22,182 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-24 11:50:22,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:22,545 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 11:50:22,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:50:22,549 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-24 11:50:22,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:22,551 INFO L225 Difference]: With dead ends: 24 [2018-10-24 11:50:22,551 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 11:50:22,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:50:22,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 11:50:22,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 11:50:22,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 11:50:22,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 11:50:22,558 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-24 11:50:22,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:22,558 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 11:50:22,558 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:50:22,559 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 11:50:22,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 11:50:22,565 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:22,565 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:22,565 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:22,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:22,566 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-24 11:50:22,566 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:22,566 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:22,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:22,567 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:22,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:22,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:22,849 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:22,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:22,850 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:22,858 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:50:22,886 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-24 11:50:22,886 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:22,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:22,915 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:22,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:22,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-24 11:50:22,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 11:50:22,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 11:50:22,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:50:22,936 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-24 11:50:23,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:23,027 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-24 11:50:23,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 11:50:23,029 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-24 11:50:23,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:23,031 INFO L225 Difference]: With dead ends: 26 [2018-10-24 11:50:23,031 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 11:50:23,031 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:50:23,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 11:50:23,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-24 11:50:23,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 11:50:23,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-24 11:50:23,037 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-24 11:50:23,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:23,037 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-24 11:50:23,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 11:50:23,037 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-24 11:50:23,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 11:50:23,038 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:23,038 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:23,038 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:23,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:23,039 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-24 11:50:23,039 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:23,039 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:23,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:23,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:23,252 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:23,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:23,253 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:23,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:23,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:23,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:23,286 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:23,306 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:23,306 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-24 11:50:23,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 11:50:23,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 11:50:23,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:50:23,308 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-24 11:50:23,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:23,438 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-24 11:50:23,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 11:50:23,439 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-24 11:50:23,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:23,440 INFO L225 Difference]: With dead ends: 28 [2018-10-24 11:50:23,441 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 11:50:23,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:50:23,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 11:50:23,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 11:50:23,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 11:50:23,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 11:50:23,446 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-24 11:50:23,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:23,447 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 11:50:23,447 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 11:50:23,447 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 11:50:23,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 11:50:23,448 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:23,448 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:23,448 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:23,449 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:23,449 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-24 11:50:23,449 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:23,449 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:23,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,450 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:23,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:23,672 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:23,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:23,673 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:23,688 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:50:23,720 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:50:23,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:23,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:23,744 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:23,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:23,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-24 11:50:23,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 11:50:23,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 11:50:23,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:50:23,768 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-24 11:50:23,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:23,882 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 11:50:23,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:50:23,883 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-24 11:50:23,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:23,884 INFO L225 Difference]: With dead ends: 30 [2018-10-24 11:50:23,885 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 11:50:23,885 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:50:23,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 11:50:23,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 11:50:23,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 11:50:23,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 11:50:23,890 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-24 11:50:23,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:23,891 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 11:50:23,891 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 11:50:23,891 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 11:50:23,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:50:23,892 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:23,892 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:23,892 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:23,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:23,893 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-24 11:50:23,893 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:23,893 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:23,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:23,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:24,088 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:24,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:24,089 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:24,099 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:50:31,311 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 11:50:31,311 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:31,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:31,355 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:31,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:31,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-24 11:50:31,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:50:31,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:50:31,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:50:31,377 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-24 11:50:31,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:31,591 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-24 11:50:31,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:50:31,591 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-24 11:50:31,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:31,593 INFO L225 Difference]: With dead ends: 32 [2018-10-24 11:50:31,593 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 11:50:31,594 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:50:31,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 11:50:31,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-24 11:50:31,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 11:50:31,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-24 11:50:31,600 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-24 11:50:31,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:31,601 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-24 11:50:31,602 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:50:31,602 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-24 11:50:31,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 11:50:31,603 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:31,603 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:31,603 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:31,604 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:31,604 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-24 11:50:31,604 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:31,604 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:31,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:31,605 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:31,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:31,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:32,401 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:32,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:32,402 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:32,420 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:50:32,440 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:50:32,440 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:32,442 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:32,464 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:32,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:32,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-24 11:50:32,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 11:50:32,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 11:50:32,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:50:32,487 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-24 11:50:32,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:32,655 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-24 11:50:32,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 11:50:32,657 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-24 11:50:32,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:32,658 INFO L225 Difference]: With dead ends: 34 [2018-10-24 11:50:32,658 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 11:50:32,659 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:50:32,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 11:50:32,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-24 11:50:32,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 11:50:32,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 11:50:32,663 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-24 11:50:32,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:32,664 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 11:50:32,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 11:50:32,664 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 11:50:32,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 11:50:32,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:32,665 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:32,665 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:32,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:32,666 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-24 11:50:32,666 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:32,666 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:32,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:32,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:32,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:32,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:33,265 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:33,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:33,266 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:33,274 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:51:39,301 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-24 11:51:39,301 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:51:39,814 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:51:39,829 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:39,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:51:39,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-24 11:51:39,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 11:51:39,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 11:51:39,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:51:39,852 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-24 11:51:40,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:51:40,061 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 11:51:40,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 11:51:40,062 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-24 11:51:40,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:51:40,063 INFO L225 Difference]: With dead ends: 36 [2018-10-24 11:51:40,063 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 11:51:40,064 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:51:40,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 11:51:40,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-24 11:51:40,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 11:51:40,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 11:51:40,071 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-24 11:51:40,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:51:40,072 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 11:51:40,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 11:51:40,072 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 11:51:40,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 11:51:40,073 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:51:40,073 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-24 11:51:40,073 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:51:40,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:51:40,074 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-24 11:51:40,074 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:51:40,074 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:51:40,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:40,075 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:51:40,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:40,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:51:40,326 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:40,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:51:40,327 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:51:40,334 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:51:50,492 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-24 11:51:50,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:51:50,497 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:51:50,531 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:50,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:51:50,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-24 11:51:50,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 11:51:50,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 11:51:50,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:51:50,552 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-24 11:51:50,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:51:50,774 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-24 11:51:50,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 11:51:50,775 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-24 11:51:50,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:51:50,776 INFO L225 Difference]: With dead ends: 38 [2018-10-24 11:51:50,776 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 11:51:50,777 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:51:50,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 11:51:50,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 11:51:50,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 11:51:50,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 11:51:50,782 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-24 11:51:50,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:51:50,782 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 11:51:50,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 11:51:50,783 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 11:51:50,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 11:51:50,783 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:51:50,784 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-24 11:51:50,784 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:51:50,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:51:50,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-24 11:51:50,784 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:51:50,785 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:51:50,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:50,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:51:50,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:50,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:51:51,237 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:51,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:51:51,237 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:51:51,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:51:51,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:51:51,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:51:51,275 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:51,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:51:51,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-24 11:51:51,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 11:51:51,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 11:51:51,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:51:51,299 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-24 11:51:51,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:51:51,611 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-24 11:51:51,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:51:51,611 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-24 11:51:51,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:51:51,612 INFO L225 Difference]: With dead ends: 40 [2018-10-24 11:51:51,613 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 11:51:51,614 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:51:51,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 11:51:51,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 11:51:51,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 11:51:51,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 11:51:51,619 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-24 11:51:51,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:51:51,619 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 11:51:51,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 11:51:51,620 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 11:51:51,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 11:51:51,620 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:51:51,621 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-24 11:51:51,621 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:51:51,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:51:51,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-24 11:51:51,621 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:51:51,621 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:51:51,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:51,622 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:51:51,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:51,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:51:52,182 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:52,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:51:52,182 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:51:52,190 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:51:52,201 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:51:52,201 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:51:52,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:51:52,220 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:52,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:51:52,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-24 11:51:52,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:51:52,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:51:52,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:51:52,242 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-24 11:51:52,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:51:52,486 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 11:51:52,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 11:51:52,486 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-24 11:51:52,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:51:52,487 INFO L225 Difference]: With dead ends: 42 [2018-10-24 11:51:52,487 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 11:51:52,488 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:51:52,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 11:51:52,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 11:51:52,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 11:51:52,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 11:51:52,493 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-24 11:51:52,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:51:52,494 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 11:51:52,494 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:51:52,494 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 11:51:52,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 11:51:52,495 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:51:52,495 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-24 11:51:52,495 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:51:52,495 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:51:52,495 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-24 11:51:52,495 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:51:52,496 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:51:52,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:52,497 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:51:52,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:51:52,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:51:52,797 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:51:52,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:51:52,798 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:51:52,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:52:08,100 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 11:52:08,101 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:52:08,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:52:08,147 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:52:08,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:52:08,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-24 11:52:08,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 11:52:08,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 11:52:08,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:52:08,179 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 18 states. [2018-10-24 11:52:08,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:52:08,628 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-24 11:52:08,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 11:52:08,628 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2018-10-24 11:52:08,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:52:08,629 INFO L225 Difference]: With dead ends: 44 [2018-10-24 11:52:08,629 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 11:52:08,630 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:52:08,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 11:52:08,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-24 11:52:08,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 11:52:08,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-24 11:52:08,637 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-24 11:52:08,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:52:08,637 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-24 11:52:08,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 11:52:08,637 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-24 11:52:08,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 11:52:08,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:52:08,638 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1] [2018-10-24 11:52:08,638 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:52:08,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:52:08,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1351703317, now seen corresponding path program 16 times [2018-10-24 11:52:08,639 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:52:08,639 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:52:08,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:52:08,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:52:08,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:52:08,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:52:09,058 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:52:09,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:52:09,059 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:52:09,067 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:52:09,093 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:52:09,093 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:52:09,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:52:09,170 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:52:09,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:52:09,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-24 11:52:09,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 11:52:09,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 11:52:09,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:52:09,201 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 19 states. [2018-10-24 11:52:09,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:52:09,478 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-24 11:52:09,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 11:52:09,478 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2018-10-24 11:52:09,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:52:09,479 INFO L225 Difference]: With dead ends: 46 [2018-10-24 11:52:09,479 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 11:52:09,480 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:52:09,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 11:52:09,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-24 11:52:09,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 11:52:09,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 11:52:09,486 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-24 11:52:09,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:52:09,486 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 11:52:09,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 11:52:09,486 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 11:52:09,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 11:52:09,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:52:09,487 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1] [2018-10-24 11:52:09,488 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:52:09,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:52:09,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1859013467, now seen corresponding path program 17 times [2018-10-24 11:52:09,488 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:52:09,488 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:52:09,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:52:09,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:52:09,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:52:09,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:52:09,811 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:52:09,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:52:09,811 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:52:09,823 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:54:44,165 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-24 11:54:44,165 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:44,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:44,483 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:44,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:44,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-10-24 11:54:44,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 11:54:44,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 11:54:44,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:54:44,514 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 20 states. [2018-10-24 11:54:45,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:45,257 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 11:54:45,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 11:54:45,258 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2018-10-24 11:54:45,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:45,258 INFO L225 Difference]: With dead ends: 48 [2018-10-24 11:54:45,258 INFO L226 Difference]: Without dead ends: 44 [2018-10-24 11:54:45,259 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:54:45,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-24 11:54:45,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-24 11:54:45,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 11:54:45,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 11:54:45,264 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-24 11:54:45,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:45,264 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 11:54:45,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 11:54:45,265 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 11:54:45,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 11:54:45,265 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:45,266 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:45,266 INFO L424 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:45,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:45,266 INFO L82 PathProgramCache]: Analyzing trace with hash 242204127, now seen corresponding path program 18 times [2018-10-24 11:54:45,266 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:45,267 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:45,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:45,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:45,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:45,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:46,073 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:46,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:46,074 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:46,086 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown