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 0.1.23-8c3fbe1 [2018-10-22 15:41:17,271 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:41:17,273 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:41:17,286 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:41:17,287 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:41:17,288 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:41:17,289 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:41:17,291 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:41:17,292 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:41:17,293 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:41:17,294 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:41:17,295 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:41:17,296 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:41:17,297 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:41:17,298 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:41:17,299 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:41:17,299 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:41:17,301 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:41:17,303 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:41:17,305 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:41:17,306 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:41:17,307 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:41:17,310 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 15:41:17,325 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 [2018-10-22 15:41:17,347 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:41:17,348 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:41:17,349 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:41:17,349 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-22 15:41:17,349 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-22 15:41:17,350 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-22 15:41:17,350 INFO L133 SettingsManager]: * Use SBE=true [2018-10-22 15:41:17,350 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:41:17,350 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:41:17,350 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:41:17,351 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:41:17,351 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:41:17,351 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:41:17,351 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:41:17,351 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:41:17,352 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:41:17,352 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:41:17,352 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:41:17,352 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:41:17,352 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:41:17,353 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:41:17,353 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:41:17,353 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:41:17,353 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-22 15:41:17,353 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:41:17,354 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:41:17,354 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:41:17,354 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:41:17,398 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:41:17,415 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:41:17,420 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:41:17,422 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:41:17,422 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:41:17,423 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-22 15:41:17,493 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/204bb7d15/99659b969a3c4faf9310f9aa58fdfb88/FLAG71983e3f8 [2018-10-22 15:41:17,973 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:41:17,973 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-22 15:41:17,981 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/204bb7d15/99659b969a3c4faf9310f9aa58fdfb88/FLAG71983e3f8 [2018-10-22 15:41:17,996 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/204bb7d15/99659b969a3c4faf9310f9aa58fdfb88 [2018-10-22 15:41:18,006 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:41:18,007 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:41:18,008 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:41:18,008 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:41:18,012 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:41:18,013 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:41:17" (1/1) ... [2018-10-22 15:41:18,016 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4389c80e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18, skipping insertion in model container [2018-10-22 15:41:18,016 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:41:17" (1/1) ... [2018-10-22 15:41:18,026 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:41:18,044 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:41:18,206 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:41:18,210 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:41:18,227 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:41:18,243 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:41:18,244 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18 WrapperNode [2018-10-22 15:41:18,244 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:41:18,248 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:41:18,248 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:41:18,248 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:41:18,257 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,263 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,282 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:41:18,282 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:41:18,283 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:41:18,283 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:41:18,293 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,294 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,294 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,296 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,303 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,304 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (1/1) ... [2018-10-22 15:41:18,305 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:41:18,306 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:41:18,306 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:41:18,306 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:41:18,307 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (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 [2018-10-22 15:41:18,422 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:41:18,423 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:41:18,618 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:41:18,619 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:41:18 BoogieIcfgContainer [2018-10-22 15:41:18,619 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:41:18,620 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:41:18,620 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:41:18,625 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:41:18,626 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:41:17" (1/3) ... [2018-10-22 15:41:18,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@129c3e6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:41:18, skipping insertion in model container [2018-10-22 15:41:18,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:18" (2/3) ... [2018-10-22 15:41:18,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@129c3e6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:41:18, skipping insertion in model container [2018-10-22 15:41:18,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:41:18" (3/3) ... [2018-10-22 15:41:18,629 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call4.i [2018-10-22 15:41:18,637 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:41:18,645 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:41:18,662 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:41:18,693 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:41:18,694 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:41:18,694 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:41:18,694 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:41:18,694 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:41:18,694 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:41:18,695 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:41:18,695 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:41:18,695 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:41:18,709 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-22 15:41:18,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-22 15:41:18,715 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:18,716 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-22 15:41:18,718 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:18,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:18,725 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-22 15:41:18,727 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:18,728 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:18,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:18,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:18,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:18,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:18,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:18,826 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:41:18,826 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:41:18,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:41:18,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:41:18,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:41:18,849 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-22 15:41:18,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:18,866 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-22 15:41:18,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:41:18,868 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-22 15:41:18,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:18,876 INFO L225 Difference]: With dead ends: 20 [2018-10-22 15:41:18,877 INFO L226 Difference]: Without dead ends: 8 [2018-10-22 15:41:18,880 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 [2018-10-22 15:41:18,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-22 15:41:18,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-22 15:41:18,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-22 15:41:18,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-22 15:41:18,913 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-22 15:41:18,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:18,913 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-22 15:41:18,914 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:41:18,914 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-22 15:41:18,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-22 15:41:18,914 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:18,915 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:18,915 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:18,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:18,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-22 15:41:18,916 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:18,916 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:18,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:18,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:18,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:18,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:19,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:19,104 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:41:19,106 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 15:41:19,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 15:41:19,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 15:41:19,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:41:19,113 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-22 15:41:19,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:19,177 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-22 15:41:19,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:41:19,179 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-22 15:41:19,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:19,180 INFO L225 Difference]: With dead ends: 14 [2018-10-22 15:41:19,180 INFO L226 Difference]: Without dead ends: 10 [2018-10-22 15:41:19,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:41:19,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-22 15:41:19,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-22 15:41:19,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-22 15:41:19,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-22 15:41:19,190 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-22 15:41:19,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:19,190 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-22 15:41:19,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 15:41:19,194 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-22 15:41:19,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-22 15:41:19,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:19,195 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:19,195 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:19,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:19,199 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-22 15:41:19,199 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:19,199 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:19,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:19,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:19,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:19,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:19,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:19,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:19,395 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 [2018-10-22 15:41:19,415 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:19,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:19,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:19,495 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:19,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:19,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-22 15:41:19,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 15:41:19,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 15:41:19,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-22 15:41:19,519 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-22 15:41:19,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:19,569 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-22 15:41:19,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 15:41:19,570 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-22 15:41:19,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:19,571 INFO L225 Difference]: With dead ends: 16 [2018-10-22 15:41:19,571 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 15:41:19,572 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 [2018-10-22 15:41:19,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 15:41:19,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 15:41:19,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 15:41:19,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-22 15:41:19,575 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-22 15:41:19,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:19,576 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-22 15:41:19,576 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 15:41:19,576 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-22 15:41:19,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 15:41:19,577 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:19,577 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:19,577 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:19,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:19,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-22 15:41:19,578 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:19,578 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:19,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:19,579 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:19,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:19,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:19,740 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:19,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:19,740 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 [2018-10-22 15:41:19,750 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:41:19,765 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:41:19,766 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:19,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:19,787 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:19,807 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:19,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-22 15:41:19,808 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:41:19,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:41:19,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:41:19,809 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-22 15:41:19,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:19,966 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-22 15:41:19,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:41:19,967 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-22 15:41:19,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:19,968 INFO L225 Difference]: With dead ends: 18 [2018-10-22 15:41:19,968 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 15:41:19,969 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 [2018-10-22 15:41:19,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 15:41:19,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 15:41:19,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 15:41:19,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 15:41:19,972 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 15:41:19,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:19,973 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 15:41:19,973 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:41:19,973 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 15:41:19,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 15:41:19,974 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:19,974 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:19,974 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:19,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:19,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-22 15:41:19,975 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:19,975 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:19,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:19,976 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:19,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:19,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:20,301 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:20,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:20,302 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 [2018-10-22 15:41:20,313 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:41:20,330 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 15:41:20,330 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:20,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:20,359 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:20,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:20,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-22 15:41:20,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 15:41:20,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 15:41:20,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:41:20,381 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-22 15:41:20,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:20,428 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-22 15:41:20,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 15:41:20,429 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-22 15:41:20,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:20,430 INFO L225 Difference]: With dead ends: 20 [2018-10-22 15:41:20,430 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 15:41:20,430 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:41:20,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 15:41:20,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 15:41:20,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 15:41:20,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 15:41:20,435 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-22 15:41:20,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:20,435 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 15:41:20,435 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 15:41:20,435 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 15:41:20,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 15:41:20,436 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:20,436 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:20,436 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:20,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:20,437 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-22 15:41:20,437 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:20,437 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:20,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:20,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:20,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:20,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:20,605 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:20,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:20,605 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 [2018-10-22 15:41:20,619 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:41:20,661 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:41:20,661 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:20,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:20,730 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:20,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:20,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-22 15:41:20,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 15:41:20,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 15:41:20,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:41:20,753 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-22 15:41:20,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:20,803 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-22 15:41:20,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 15:41:20,804 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-22 15:41:20,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:20,806 INFO L225 Difference]: With dead ends: 22 [2018-10-22 15:41:20,806 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 15:41:20,807 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 [2018-10-22 15:41:20,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 15:41:20,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 15:41:20,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 15:41:20,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 15:41:20,811 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-22 15:41:20,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:20,813 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 15:41:20,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 15:41:20,813 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 15:41:20,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 15:41:20,815 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:20,815 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:20,816 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:20,817 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:20,817 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-22 15:41:20,817 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:20,817 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:20,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:20,818 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:20,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:20,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:21,046 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:21,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:21,047 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 [2018-10-22 15:41:21,060 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:41:21,208 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 15:41:21,208 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:21,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:21,234 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:21,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:21,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-22 15:41:21,261 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 15:41:21,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 15:41:21,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-22 15:41:21,262 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-22 15:41:21,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:21,386 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-22 15:41:21,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 15:41:21,390 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-22 15:41:21,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:21,391 INFO L225 Difference]: With dead ends: 24 [2018-10-22 15:41:21,391 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 15:41:21,392 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-22 15:41:21,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 15:41:21,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 15:41:21,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 15:41:21,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 15:41:21,395 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-22 15:41:21,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:21,396 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 15:41:21,396 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 15:41:21,396 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 15:41:21,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 15:41:21,397 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:21,397 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:21,397 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:21,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:21,397 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-22 15:41:21,398 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:21,398 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:21,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:21,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:21,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:21,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:21,944 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:21,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:21,945 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 [2018-10-22 15:41:21,954 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:41:21,978 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 15:41:21,978 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:21,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:22,004 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:22,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:22,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-22 15:41:22,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 15:41:22,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 15:41:22,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:41:22,026 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-22 15:41:22,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:22,133 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-22 15:41:22,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 15:41:22,135 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-22 15:41:22,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:22,136 INFO L225 Difference]: With dead ends: 26 [2018-10-22 15:41:22,136 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 15:41:22,136 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:41:22,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 15:41:22,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 15:41:22,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 15:41:22,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-22 15:41:22,140 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-22 15:41:22,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:22,141 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-22 15:41:22,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 15:41:22,141 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-22 15:41:22,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 15:41:22,142 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:22,142 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:22,142 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:22,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:22,143 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-22 15:41:22,143 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:22,143 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:22,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:22,144 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:22,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:22,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:22,383 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:22,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:22,384 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 [2018-10-22 15:41:22,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:22,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:22,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:22,427 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:22,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:22,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-22 15:41:22,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 15:41:22,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 15:41:22,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-22 15:41:22,449 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-22 15:41:22,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:22,581 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-22 15:41:22,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 15:41:22,582 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-22 15:41:22,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:22,584 INFO L225 Difference]: With dead ends: 28 [2018-10-22 15:41:22,584 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 15:41:22,585 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 [2018-10-22 15:41:22,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 15:41:22,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 15:41:22,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 15:41:22,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 15:41:22,589 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-22 15:41:22,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:22,590 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 15:41:22,590 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 15:41:22,590 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 15:41:22,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 15:41:22,591 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:22,591 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:22,591 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:22,591 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:22,592 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-22 15:41:22,592 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:22,592 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:22,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:22,593 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:22,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:22,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:22,932 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:22,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:22,933 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 [2018-10-22 15:41:22,944 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:41:22,980 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:41:22,981 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:22,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:23,001 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:23,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:23,023 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-22 15:41:23,023 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 15:41:23,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 15:41:23,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:41:23,025 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-22 15:41:23,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:23,128 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-22 15:41:23,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 15:41:23,129 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-22 15:41:23,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:23,130 INFO L225 Difference]: With dead ends: 30 [2018-10-22 15:41:23,130 INFO L226 Difference]: Without dead ends: 26 [2018-10-22 15:41:23,131 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:41:23,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-22 15:41:23,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-22 15:41:23,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 15:41:23,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-22 15:41:23,136 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-22 15:41:23,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:23,137 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-22 15:41:23,137 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 15:41:23,137 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-22 15:41:23,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 15:41:23,138 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:23,138 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:23,138 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:23,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:23,139 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-22 15:41:23,139 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:23,139 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:23,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:23,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:23,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:23,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:23,342 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:23,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:23,342 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 [2018-10-22 15:41:23,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:41:30,321 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 15:41:30,322 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:30,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:30,364 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:30,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:30,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-22 15:41:30,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 15:41:30,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 15:41:30,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:41:30,386 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-22 15:41:30,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:30,608 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-22 15:41:30,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 15:41:30,609 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-22 15:41:30,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:30,609 INFO L225 Difference]: With dead ends: 32 [2018-10-22 15:41:30,610 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 15:41:30,610 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 [2018-10-22 15:41:30,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 15:41:30,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-22 15:41:30,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-22 15:41:30,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-22 15:41:30,615 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-22 15:41:30,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:30,615 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-22 15:41:30,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 15:41:30,616 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-22 15:41:30,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 15:41:30,616 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:30,616 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:30,616 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:30,617 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:30,617 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-22 15:41:30,617 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:30,617 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:30,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:30,618 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:30,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:30,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:30,888 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:30,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:30,889 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 [2018-10-22 15:41:30,904 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:41:30,927 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:41:30,927 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:30,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:30,957 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:30,988 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:30,988 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-22 15:41:30,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 15:41:30,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 15:41:30,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:41:30,990 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-22 15:41:31,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:31,168 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-22 15:41:31,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 15:41:31,171 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-22 15:41:31,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:31,171 INFO L225 Difference]: With dead ends: 34 [2018-10-22 15:41:31,171 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 15:41:31,172 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:41:31,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 15:41:31,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-22 15:41:31,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 15:41:31,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 15:41:31,176 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-22 15:41:31,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:31,176 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 15:41:31,177 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 15:41:31,177 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 15:41:31,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 15:41:31,178 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:31,178 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:31,178 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:31,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:31,178 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-22 15:41:31,179 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:31,179 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:31,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:31,180 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:31,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:31,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:31,651 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:31,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:31,651 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 [2018-10-22 15:41:31,660 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:42:37,229 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 15:42:37,229 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:42:38,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:38,974 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:38,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:38,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-22 15:42:38,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 15:42:38,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 15:42:38,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-22 15:42:38,996 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-22 15:42:39,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:39,144 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-22 15:42:39,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 15:42:39,145 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-22 15:42:39,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:39,147 INFO L225 Difference]: With dead ends: 36 [2018-10-22 15:42:39,147 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 15:42:39,149 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-22 15:42:39,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 15:42:39,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-22 15:42:39,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 15:42:39,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-22 15:42:39,154 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-22 15:42:39,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:39,155 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-22 15:42:39,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 15:42:39,155 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-22 15:42:39,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 15:42:39,156 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:39,156 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:39,156 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:39,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:39,157 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-22 15:42:39,157 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:39,157 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:39,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:39,158 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:42:39,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:39,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:39,396 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:39,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:39,396 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 [2018-10-22 15:42:39,406 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:42:49,580 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 15:42:49,581 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:42:49,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:49,619 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:49,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:49,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-22 15:42:49,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 15:42:49,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 15:42:49,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:42:49,642 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-22 15:42:49,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:49,873 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-22 15:42:49,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 15:42:49,874 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-22 15:42:49,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:49,874 INFO L225 Difference]: With dead ends: 38 [2018-10-22 15:42:49,874 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 15:42:49,875 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 [2018-10-22 15:42:49,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 15:42:49,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-22 15:42:49,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 15:42:49,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-22 15:42:49,880 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-22 15:42:49,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:49,880 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-22 15:42:49,881 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 15:42:49,881 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-22 15:42:49,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 15:42:49,882 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:49,882 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:49,882 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:49,882 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:49,883 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-22 15:42:49,883 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:49,883 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:49,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:49,884 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:42:49,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:49,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:50,344 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:50,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:50,345 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 [2018-10-22 15:42:50,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:42:50,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:50,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:50,386 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:50,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:50,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-22 15:42:50,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 15:42:50,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 15:42:50,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-22 15:42:50,407 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-22 15:42:50,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:50,703 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-22 15:42:50,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:42:50,703 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-22 15:42:50,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:50,704 INFO L225 Difference]: With dead ends: 40 [2018-10-22 15:42:50,705 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 15:42:50,706 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 [2018-10-22 15:42:50,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 15:42:50,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-22 15:42:50,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 15:42:50,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-22 15:42:50,710 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-22 15:42:50,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:50,711 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-22 15:42:50,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 15:42:50,711 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-22 15:42:50,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 15:42:50,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:50,712 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:50,712 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:50,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:50,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-22 15:42:50,713 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:50,713 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:50,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:50,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:42:50,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:50,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:51,208 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:51,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:51,208 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 [2018-10-22 15:42:51,216 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:42:51,249 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:42:51,249 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:42:51,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:51,327 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:51,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:51,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-22 15:42:51,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 15:42:51,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 15:42:51,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:42:51,363 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-22 15:42:51,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:51,711 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-22 15:42:51,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 15:42:51,712 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-22 15:42:51,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:51,713 INFO L225 Difference]: With dead ends: 42 [2018-10-22 15:42:51,713 INFO L226 Difference]: Without dead ends: 38 [2018-10-22 15:42:51,714 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 [2018-10-22 15:42:51,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-22 15:42:51,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-22 15:42:51,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 15:42:51,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-22 15:42:51,719 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-22 15:42:51,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:51,719 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-22 15:42:51,719 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 15:42:51,719 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-22 15:42:51,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 15:42:51,720 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:51,720 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:51,721 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:51,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:51,721 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-22 15:42:51,721 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:51,721 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:51,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:51,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:42:51,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:51,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:52,147 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:52,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:52,148 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 [2018-10-22 15:42:52,157 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:43:07,445 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 15:43:07,445 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:43:07,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:43:07,521 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:43:07,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:43:07,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-22 15:43:07,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 15:43:07,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 15:43:07,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-22 15:43:07,528 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 18 states. [2018-10-22 15:43:07,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:43:07,970 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-22 15:43:07,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 15:43:07,970 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2018-10-22 15:43:07,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:43:07,971 INFO L225 Difference]: With dead ends: 44 [2018-10-22 15:43:07,971 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 15:43:07,972 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-22 15:43:07,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 15:43:07,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-22 15:43:07,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-22 15:43:07,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-22 15:43:07,978 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-22 15:43:07,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:43:07,978 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-22 15:43:07,978 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 15:43:07,978 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-22 15:43:07,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-22 15:43:07,979 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:43:07,979 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1] [2018-10-22 15:43:07,979 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:43:07,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:43:07,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1351703317, now seen corresponding path program 16 times [2018-10-22 15:43:07,980 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:43:07,980 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:43:07,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:43:07,981 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:43:07,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:43:07,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:43:08,345 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:43:08,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:43:08,346 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 [2018-10-22 15:43:08,353 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:43:08,379 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:43:08,379 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:43:08,381 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:43:08,464 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:43:08,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:43:08,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-22 15:43:08,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 15:43:08,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 15:43:08,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:43:08,494 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 19 states. [2018-10-22 15:43:08,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:43:08,749 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-22 15:43:08,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 15:43:08,750 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2018-10-22 15:43:08,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:43:08,751 INFO L225 Difference]: With dead ends: 46 [2018-10-22 15:43:08,751 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 15:43:08,752 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:43:08,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 15:43:08,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-22 15:43:08,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 15:43:08,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-22 15:43:08,757 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-22 15:43:08,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:43:08,757 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-22 15:43:08,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 15:43:08,758 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-22 15:43:08,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 15:43:08,758 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:43:08,759 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1] [2018-10-22 15:43:08,759 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:43:08,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:43:08,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1859013467, now seen corresponding path program 17 times [2018-10-22 15:43:08,759 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:43:08,759 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:43:08,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:43:08,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:43:08,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:43:08,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:43:09,643 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:43:09,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:43:09,644 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 [2018-10-22 15:43:09,658 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown