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/phases_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 15:45:09,468 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:45:09,470 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:45:09,483 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:45:09,483 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:45:09,485 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:45:09,486 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:45:09,487 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:45:09,489 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:45:09,490 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:45:09,491 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:45:09,491 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:45:09,492 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:45:09,493 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:45:09,494 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:45:09,495 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:45:09,496 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:45:09,498 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:45:09,500 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:45:09,501 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:45:09,502 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:45:09,504 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:45:09,506 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 15:45:09,517 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 15:45:09,532 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:45:09,532 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:45:09,533 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:45:09,533 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-22 15:45:09,534 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-22 15:45:09,534 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-22 15:45:09,534 INFO L133 SettingsManager]: * Use SBE=true [2018-10-22 15:45:09,534 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:45:09,534 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:45:09,535 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:45:09,535 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:45:09,535 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:45:09,535 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:45:09,535 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:45:09,536 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:45:09,536 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:45:09,536 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:45:09,536 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:45:09,536 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:45:09,536 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:45:09,537 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:45:09,537 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:45:09,537 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:45:09,537 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-22 15:45:09,537 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:45:09,538 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:45:09,538 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:45:09,538 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:45:09,592 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:45:09,605 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:45:09,608 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:45:09,610 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:45:09,610 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:45:09,611 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_true-unreach-call1.i [2018-10-22 15:45:09,678 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e92422385/fd600ae094f3424f902ae7e351b2a420/FLAG1f0ecc54b [2018-10-22 15:45:10,142 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:45:10,143 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_true-unreach-call1.i [2018-10-22 15:45:10,149 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e92422385/fd600ae094f3424f902ae7e351b2a420/FLAG1f0ecc54b [2018-10-22 15:45:10,162 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e92422385/fd600ae094f3424f902ae7e351b2a420 [2018-10-22 15:45:10,171 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:45:10,173 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:45:10,174 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:45:10,174 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:45:10,178 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:45:10,179 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,182 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f1f8979 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10, skipping insertion in model container [2018-10-22 15:45:10,182 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,192 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:45:10,212 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:45:10,416 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:45:10,420 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:45:10,439 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:45:10,457 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:45:10,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10 WrapperNode [2018-10-22 15:45:10,458 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:45:10,459 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:45:10,459 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:45:10,460 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:45:10,469 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,474 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,495 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:45:10,496 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:45:10,496 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:45:10,496 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:45:10,506 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,506 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,507 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,507 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,513 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,520 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,521 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (1/1) ... [2018-10-22 15:45:10,522 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:45:10,523 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:45:10,528 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:45:10,528 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:45:10,529 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (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 15:45:10,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:45:10,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:45:10,874 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:45:10,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:45:10 BoogieIcfgContainer [2018-10-22 15:45:10,875 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:45:10,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:45:10,876 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:45:10,879 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:45:10,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:45:10" (1/3) ... [2018-10-22 15:45:10,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b4b413 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:45:10, skipping insertion in model container [2018-10-22 15:45:10,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:10" (2/3) ... [2018-10-22 15:45:10,881 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b4b413 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:45:10, skipping insertion in model container [2018-10-22 15:45:10,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:45:10" (3/3) ... [2018-10-22 15:45:10,883 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_true-unreach-call1.i [2018-10-22 15:45:10,893 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:45:10,904 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:45:10,921 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:45:10,959 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:45:10,960 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:45:10,960 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:45:10,960 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:45:10,960 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:45:10,960 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:45:10,960 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:45:10,961 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:45:10,961 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:45:10,973 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2018-10-22 15:45:10,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-22 15:45:10,979 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:10,980 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-22 15:45:10,982 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:10,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:10,989 INFO L82 PathProgramCache]: Analyzing trace with hash 889968487, now seen corresponding path program 1 times [2018-10-22 15:45:10,991 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:10,991 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:11,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:11,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:11,104 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 15:45:11,107 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:45:11,107 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:45:11,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:45:11,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:45:11,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:45:11,126 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 2 states. [2018-10-22 15:45:11,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:11,142 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2018-10-22 15:45:11,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:45:11,144 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-22 15:45:11,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:11,154 INFO L225 Difference]: With dead ends: 21 [2018-10-22 15:45:11,154 INFO L226 Difference]: Without dead ends: 9 [2018-10-22 15:45:11,158 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 15:45:11,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-22 15:45:11,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-22 15:45:11,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-22 15:45:11,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-10-22 15:45:11,190 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-10-22 15:45:11,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:11,191 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-10-22 15:45:11,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:45:11,191 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-10-22 15:45:11,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-22 15:45:11,192 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:11,192 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:11,192 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:11,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:11,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1805929617, now seen corresponding path program 1 times [2018-10-22 15:45:11,193 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:11,193 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:11,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:11,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:11,335 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 15:45:11,335 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:45:11,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 15:45:11,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 15:45:11,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 15:45:11,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:45:11,341 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 3 states. [2018-10-22 15:45:11,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:11,432 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2018-10-22 15:45:11,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:45:11,433 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-22 15:45:11,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:11,433 INFO L225 Difference]: With dead ends: 19 [2018-10-22 15:45:11,433 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 15:45:11,435 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:45:11,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 15:45:11,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 15:45:11,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 15:45:11,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-10-22 15:45:11,443 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 7 [2018-10-22 15:45:11,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:11,444 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-10-22 15:45:11,444 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 15:45:11,444 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-10-22 15:45:11,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 15:45:11,445 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:11,445 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:11,445 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:11,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:11,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1049525042, now seen corresponding path program 1 times [2018-10-22 15:45:11,446 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:11,447 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:11,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,448 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:11,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:11,569 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 15:45:11,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:11,572 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 15:45:11,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:11,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:11,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:11,658 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 15:45:11,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:11,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-22 15:45:11,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 15:45:11,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 15:45:11,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-22 15:45:11,684 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 4 states. [2018-10-22 15:45:11,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:11,776 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2018-10-22 15:45:11,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 15:45:11,777 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2018-10-22 15:45:11,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:11,777 INFO L225 Difference]: With dead ends: 22 [2018-10-22 15:45:11,778 INFO L226 Difference]: Without dead ends: 15 [2018-10-22 15:45:11,779 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-22 15:45:11,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-22 15:45:11,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-22 15:45:11,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-22 15:45:11,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-22 15:45:11,783 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-10-22 15:45:11,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:11,783 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-22 15:45:11,784 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 15:45:11,784 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-22 15:45:11,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 15:45:11,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:11,785 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:11,785 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:11,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:11,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1777006735, now seen corresponding path program 2 times [2018-10-22 15:45:11,786 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:11,786 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:11,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:11,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:11,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:11,924 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:11,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:11,925 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 15:45:11,941 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:45:11,985 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:45:11,985 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:11,987 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:12,035 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:12,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:12,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-22 15:45:12,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:45:12,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:45:12,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:45:12,059 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2018-10-22 15:45:12,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:12,324 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2018-10-22 15:45:12,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:45:12,325 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-22 15:45:12,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:12,326 INFO L225 Difference]: With dead ends: 25 [2018-10-22 15:45:12,326 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 15:45:12,326 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 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 15:45:12,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 15:45:12,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 15:45:12,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 15:45:12,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-22 15:45:12,330 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-22 15:45:12,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:12,331 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-22 15:45:12,331 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:45:12,331 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-22 15:45:12,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-22 15:45:12,332 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:12,332 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:12,332 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:12,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:12,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1779147282, now seen corresponding path program 3 times [2018-10-22 15:45:12,332 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:12,333 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:12,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:12,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:12,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:12,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:12,500 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:12,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:12,501 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 15:45:12,510 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:45:12,517 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-22 15:45:12,517 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:12,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:12,546 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 15:45:12,566 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-22 15:45:12,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2018-10-22 15:45:12,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 15:45:12,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 15:45:12,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:45:12,567 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2018-10-22 15:45:12,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:12,758 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2018-10-22 15:45:12,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 15:45:12,759 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2018-10-22 15:45:12,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:12,760 INFO L225 Difference]: With dead ends: 31 [2018-10-22 15:45:12,760 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 15:45:12,761 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:45:12,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 15:45:12,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-22 15:45:12,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 15:45:12,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-22 15:45:12,765 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 16 [2018-10-22 15:45:12,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:12,765 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-22 15:45:12,765 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 15:45:12,766 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-22 15:45:12,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-22 15:45:12,766 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:12,766 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:12,767 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:12,767 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:12,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1231130700, now seen corresponding path program 1 times [2018-10-22 15:45:12,767 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:12,767 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:12,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:12,768 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:12,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:12,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:12,951 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:12,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:12,951 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 15:45:12,966 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:12,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:12,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:13,033 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:13,059 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:13,059 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2018-10-22 15:45:13,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 15:45:13,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 15:45:13,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-22 15:45:13,060 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-10-22 15:45:13,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:13,324 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-22 15:45:13,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 15:45:13,328 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2018-10-22 15:45:13,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:13,329 INFO L225 Difference]: With dead ends: 35 [2018-10-22 15:45:13,329 INFO L226 Difference]: Without dead ends: 26 [2018-10-22 15:45:13,330 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 3 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 15:45:13,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-22 15:45:13,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-22 15:45:13,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 15:45:13,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2018-10-22 15:45:13,334 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2018-10-22 15:45:13,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:13,335 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2018-10-22 15:45:13,335 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 15:45:13,335 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2018-10-22 15:45:13,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 15:45:13,336 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:13,336 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:13,336 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:13,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:13,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1472252305, now seen corresponding path program 2 times [2018-10-22 15:45:13,337 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:13,337 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:13,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:13,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:13,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:13,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:13,913 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:13,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:13,913 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 15:45:13,926 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:45:13,936 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:45:13,936 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:13,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:13,956 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:13,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:13,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-22 15:45:13,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 15:45:13,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 15:45:13,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:45:13,978 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 9 states. [2018-10-22 15:45:14,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:14,113 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2018-10-22 15:45:14,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 15:45:14,114 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2018-10-22 15:45:14,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:14,115 INFO L225 Difference]: With dead ends: 38 [2018-10-22 15:45:14,115 INFO L226 Difference]: Without dead ends: 29 [2018-10-22 15:45:14,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 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 15:45:14,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-22 15:45:14,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-22 15:45:14,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 15:45:14,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-22 15:45:14,120 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2018-10-22 15:45:14,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:14,121 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-22 15:45:14,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 15:45:14,121 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-22 15:45:14,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 15:45:14,122 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:14,122 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:14,122 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:14,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:14,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1271380332, now seen corresponding path program 3 times [2018-10-22 15:45:14,122 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:14,123 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:14,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:14,124 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:14,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:14,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:14,438 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:14,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:14,438 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 15:45:14,448 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:45:14,457 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 15:45:14,458 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:14,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:14,516 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 15:45:14,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:14,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 4] total 12 [2018-10-22 15:45:14,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 15:45:14,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 15:45:14,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:45:14,540 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 12 states. [2018-10-22 15:45:14,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:14,880 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2018-10-22 15:45:14,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 15:45:14,881 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2018-10-22 15:45:14,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:14,882 INFO L225 Difference]: With dead ends: 48 [2018-10-22 15:45:14,882 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 15:45:14,882 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:45:14,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 15:45:14,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2018-10-22 15:45:14,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-22 15:45:14,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-22 15:45:14,888 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2018-10-22 15:45:14,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:14,888 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-22 15:45:14,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 15:45:14,888 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-22 15:45:14,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-22 15:45:14,889 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:14,890 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 7, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:14,890 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:14,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:14,890 INFO L82 PathProgramCache]: Analyzing trace with hash 242968718, now seen corresponding path program 4 times [2018-10-22 15:45:14,890 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:14,891 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:14,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:14,891 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:14,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:14,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:15,196 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:15,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:15,197 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 15:45:15,212 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:45:15,235 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:45:15,235 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:15,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:15,322 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 15:45:15,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:15,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 12 [2018-10-22 15:45:15,343 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 15:45:15,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 15:45:15,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:45:15,344 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 12 states. [2018-10-22 15:45:15,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:15,824 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2018-10-22 15:45:15,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 15:45:15,825 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-10-22 15:45:15,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:15,826 INFO L225 Difference]: With dead ends: 50 [2018-10-22 15:45:15,826 INFO L226 Difference]: Without dead ends: 38 [2018-10-22 15:45:15,827 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:45:15,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-22 15:45:15,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-22 15:45:15,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 15:45:15,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-22 15:45:15,833 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-10-22 15:45:15,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:15,834 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-22 15:45:15,834 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 15:45:15,834 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-22 15:45:15,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 15:45:15,835 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:15,835 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 8, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:15,835 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:15,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:15,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1678118351, now seen corresponding path program 5 times [2018-10-22 15:45:15,836 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:15,836 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:15,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:15,837 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:15,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:15,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:16,065 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:16,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:16,066 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 15:45:16,076 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:46:07,408 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2018-10-22 15:46:07,408 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:08,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:08,250 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:08,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:08,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-22 15:46:08,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 15:46:08,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 15:46:08,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:46:08,256 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 13 states. [2018-10-22 15:46:08,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:08,622 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2018-10-22 15:46:08,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 15:46:08,624 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2018-10-22 15:46:08,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:08,625 INFO L225 Difference]: With dead ends: 53 [2018-10-22 15:46:08,625 INFO L226 Difference]: Without dead ends: 41 [2018-10-22 15:46:08,626 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:46:08,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-22 15:46:08,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-22 15:46:08,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-22 15:46:08,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-22 15:46:08,632 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2018-10-22 15:46:08,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:08,633 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-22 15:46:08,633 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 15:46:08,633 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-22 15:46:08,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-22 15:46:08,634 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:08,634 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 9, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:08,634 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:08,634 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:08,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1951195566, now seen corresponding path program 6 times [2018-10-22 15:46:08,635 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:08,635 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:08,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:08,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:08,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:08,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:09,302 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:09,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:09,302 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 15:46:09,310 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:46:09,332 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 15:46:09,333 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:09,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:09,422 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 7 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 15:46:09,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:09,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2018-10-22 15:46:09,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 15:46:09,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 15:46:09,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:46:09,445 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 17 states. [2018-10-22 15:46:10,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:10,923 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2018-10-22 15:46:10,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:46:10,923 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 40 [2018-10-22 15:46:10,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:10,925 INFO L225 Difference]: With dead ends: 63 [2018-10-22 15:46:10,925 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 15:46:10,926 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:46:10,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 15:46:10,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47. [2018-10-22 15:46:10,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 15:46:10,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-10-22 15:46:10,935 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 40 [2018-10-22 15:46:10,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:10,935 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-10-22 15:46:10,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 15:46:10,935 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-10-22 15:46:10,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 15:46:10,936 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:10,936 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 10, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:10,937 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:10,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:10,937 INFO L82 PathProgramCache]: Analyzing trace with hash -141931124, now seen corresponding path program 7 times [2018-10-22 15:46:10,937 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:10,937 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:10,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:10,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:10,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:10,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:11,279 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:11,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:11,280 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 15:46:11,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:46:11,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:11,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:11,411 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 88 proven. 165 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 15:46:11,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:11,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 16 [2018-10-22 15:46:11,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 15:46:11,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 15:46:11,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-22 15:46:11,433 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 16 states. [2018-10-22 15:46:11,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:11,815 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2018-10-22 15:46:11,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 15:46:11,816 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2018-10-22 15:46:11,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:11,817 INFO L225 Difference]: With dead ends: 65 [2018-10-22 15:46:11,818 INFO L226 Difference]: Without dead ends: 50 [2018-10-22 15:46:11,819 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-22 15:46:11,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-22 15:46:11,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-22 15:46:11,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-22 15:46:11,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2018-10-22 15:46:11,825 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 46 [2018-10-22 15:46:11,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:11,826 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2018-10-22 15:46:11,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 15:46:11,826 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2018-10-22 15:46:11,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-22 15:46:11,827 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:11,827 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 11, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:11,827 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:11,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:11,828 INFO L82 PathProgramCache]: Analyzing trace with hash 871398063, now seen corresponding path program 8 times [2018-10-22 15:46:11,828 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:11,828 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:11,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:11,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:46:11,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:11,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:12,191 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:12,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:12,191 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 15:46:12,199 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:46:12,245 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:46:12,245 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:12,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:12,343 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:12,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:12,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-22 15:46:12,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 15:46:12,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 15:46:12,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:46:12,383 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 17 states. [2018-10-22 15:46:12,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:12,813 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2018-10-22 15:46:12,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 15:46:12,813 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 49 [2018-10-22 15:46:12,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:12,815 INFO L225 Difference]: With dead ends: 68 [2018-10-22 15:46:12,815 INFO L226 Difference]: Without dead ends: 53 [2018-10-22 15:46:12,816 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:46:12,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-22 15:46:12,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-10-22 15:46:12,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-22 15:46:12,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-10-22 15:46:12,823 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2018-10-22 15:46:12,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:12,823 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-10-22 15:46:12,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 15:46:12,823 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-10-22 15:46:12,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-22 15:46:12,824 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:12,824 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 12, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:12,825 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:12,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:12,825 INFO L82 PathProgramCache]: Analyzing trace with hash -363915604, now seen corresponding path program 9 times [2018-10-22 15:46:12,825 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:12,825 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:12,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:12,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:12,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:12,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:13,161 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:13,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:13,161 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 15:46:13,169 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:46:13,186 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 15:46:13,186 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:13,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:13,374 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 15 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 15:46:13,395 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:13,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2018-10-22 15:46:13,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 15:46:13,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 15:46:13,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2018-10-22 15:46:13,396 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 22 states. [2018-10-22 15:46:14,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:14,321 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2018-10-22 15:46:14,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 15:46:14,321 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2018-10-22 15:46:14,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:14,322 INFO L225 Difference]: With dead ends: 78 [2018-10-22 15:46:14,322 INFO L226 Difference]: Without dead ends: 63 [2018-10-22 15:46:14,322 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=134, Invalid=466, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:46:14,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-22 15:46:14,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 59. [2018-10-22 15:46:14,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-22 15:46:14,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2018-10-22 15:46:14,329 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 52 [2018-10-22 15:46:14,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:14,329 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2018-10-22 15:46:14,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 15:46:14,329 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2018-10-22 15:46:14,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-22 15:46:14,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:14,330 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 13, 4, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:14,330 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:14,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:14,331 INFO L82 PathProgramCache]: Analyzing trace with hash -820552626, now seen corresponding path program 10 times [2018-10-22 15:46:14,331 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:14,331 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:14,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:14,332 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:14,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:14,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:14,706 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:14,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:14,706 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 15:46:14,718 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:46:14,758 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:46:14,758 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:14,761 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:14,914 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 15:46:14,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:14,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 20 [2018-10-22 15:46:14,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 15:46:14,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 15:46:14,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-22 15:46:14,936 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand 20 states. [2018-10-22 15:46:15,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:15,926 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2018-10-22 15:46:15,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:46:15,926 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 58 [2018-10-22 15:46:15,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:15,927 INFO L225 Difference]: With dead ends: 80 [2018-10-22 15:46:15,927 INFO L226 Difference]: Without dead ends: 62 [2018-10-22 15:46:15,928 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-22 15:46:15,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-22 15:46:15,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-10-22 15:46:15,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-22 15:46:15,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2018-10-22 15:46:15,937 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 58 [2018-10-22 15:46:15,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:15,937 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2018-10-22 15:46:15,937 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 15:46:15,938 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2018-10-22 15:46:15,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-22 15:46:15,939 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:15,939 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:15,940 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:15,940 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:15,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1183575281, now seen corresponding path program 11 times [2018-10-22 15:46:15,940 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:15,940 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:15,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:15,946 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:15,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:15,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:16,630 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:16,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:16,631 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 15:46:16,642 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:48:53,679 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-22 15:48:53,679 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:56,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:56,680 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:56,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:56,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 21 [2018-10-22 15:48:56,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 15:48:56,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 15:48:56,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:48:56,705 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 21 states. [2018-10-22 15:48:57,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:57,303 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2018-10-22 15:48:57,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 15:48:57,303 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 61 [2018-10-22 15:48:57,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:57,305 INFO L225 Difference]: With dead ends: 83 [2018-10-22 15:48:57,305 INFO L226 Difference]: Without dead ends: 65 [2018-10-22 15:48:57,306 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:48:57,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-22 15:48:57,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-10-22 15:48:57,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-22 15:48:57,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2018-10-22 15:48:57,313 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2018-10-22 15:48:57,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:57,314 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2018-10-22 15:48:57,314 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 15:48:57,314 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2018-10-22 15:48:57,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-22 15:48:57,315 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:57,315 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 15, 4, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:57,315 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:57,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:57,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1817671022, now seen corresponding path program 12 times [2018-10-22 15:48:57,316 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:57,316 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:57,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:57,316 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:57,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:57,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:58,133 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:58,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:58,134 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 15:48:58,142 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:49:47,262 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2018-10-22 15:49:47,263 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:49:47,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:49:47,684 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 238 proven. 40 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 15:49:47,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:49:47,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 8] total 28 [2018-10-22 15:49:47,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 15:49:47,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 15:49:47,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=614, Unknown=0, NotChecked=0, Total=756 [2018-10-22 15:49:47,707 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand 28 states. [2018-10-22 15:49:53,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:49:53,913 INFO L93 Difference]: Finished difference Result 96 states and 110 transitions. [2018-10-22 15:49:53,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 15:49:53,914 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 64 [2018-10-22 15:49:53,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:49:53,915 INFO L225 Difference]: With dead ends: 96 [2018-10-22 15:49:53,915 INFO L226 Difference]: Without dead ends: 78 [2018-10-22 15:49:53,916 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=234, Invalid=822, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 15:49:53,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-22 15:49:53,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 71. [2018-10-22 15:49:53,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-22 15:49:53,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2018-10-22 15:49:53,923 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 64 [2018-10-22 15:49:53,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:49:53,923 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2018-10-22 15:49:53,923 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 15:49:53,924 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2018-10-22 15:49:53,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-22 15:49:53,924 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:49:53,924 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 16, 5, 1, 1, 1, 1, 1, 1] [2018-10-22 15:49:53,925 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:49:53,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:49:53,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1152648500, now seen corresponding path program 13 times [2018-10-22 15:49:53,925 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:49:53,925 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:49:53,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:49:53,926 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:49:53,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:49:53,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:49:54,367 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:49:54,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:49:54,367 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 15:49:54,375 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:49:54,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:49:54,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:49:54,497 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 238 proven. 408 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 15:49:54,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:49:54,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 24 [2018-10-22 15:49:54,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 15:49:54,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 15:49:54,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-22 15:49:54,519 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 24 states. [2018-10-22 15:49:55,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:49:55,374 INFO L93 Difference]: Finished difference Result 95 states and 106 transitions. [2018-10-22 15:49:55,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 15:49:55,375 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 70 [2018-10-22 15:49:55,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:49:55,376 INFO L225 Difference]: With dead ends: 95 [2018-10-22 15:49:55,376 INFO L226 Difference]: Without dead ends: 74 [2018-10-22 15:49:55,377 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-22 15:49:55,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-22 15:49:55,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-10-22 15:49:55,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-22 15:49:55,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2018-10-22 15:49:55,386 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 70 [2018-10-22 15:49:55,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:49:55,386 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2018-10-22 15:49:55,386 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 15:49:55,386 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2018-10-22 15:49:55,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-22 15:49:55,387 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:49:55,387 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 17, 5, 1, 1, 1, 1, 1, 1] [2018-10-22 15:49:55,387 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:49:55,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:49:55,388 INFO L82 PathProgramCache]: Analyzing trace with hash 903196399, now seen corresponding path program 14 times [2018-10-22 15:49:55,388 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:49:55,388 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:49:55,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:49:55,389 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:49:55,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:49:55,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:49:56,085 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:49:56,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:49:56,086 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 15:49:56,093 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:49:56,119 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:49:56,120 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:49:56,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:49:56,145 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:49:56,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:49:56,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-22 15:49:56,166 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 15:49:56,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 15:49:56,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:49:56,167 INFO L87 Difference]: Start difference. First operand 74 states and 79 transitions. Second operand 25 states. Received shutdown request... [2018-10-22 15:49:56,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:49:56,221 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 15:49:56,226 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 15:49:56,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 03:49:56 BoogieIcfgContainer [2018-10-22 15:49:56,226 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 15:49:56,227 INFO L168 Benchmark]: Toolchain (without parser) took 286055.31 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 878.2 MB). Free memory was 1.4 GB in the beginning and 2.3 GB in the end (delta: -829.1 MB). Peak memory consumption was 49.0 MB. Max. memory is 7.1 GB. [2018-10-22 15:49:56,229 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 15:49:56,229 INFO L168 Benchmark]: CACSL2BoogieTranslator took 283.96 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 15:49:56,230 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.68 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 15:49:56,230 INFO L168 Benchmark]: Boogie Preprocessor took 26.66 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 15:49:56,231 INFO L168 Benchmark]: RCFGBuilder took 352.86 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 752.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -791.5 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. [2018-10-22 15:49:56,232 INFO L168 Benchmark]: TraceAbstraction took 285350.41 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 125.3 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -48.2 MB). Peak memory consumption was 77.1 MB. Max. memory is 7.1 GB. [2018-10-22 15:49:56,236 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 283.96 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 36.68 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.66 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 352.86 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 752.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -791.5 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 285350.41 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 125.3 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -48.2 MB). Peak memory consumption was 77.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was constructing difference of abstraction (74states) and FLOYD_HOARE automaton (currently 3 states, 25 states before enhancement),while ReachableStatesComputation was computing reachable states (4 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 13 locations, 1 error locations. TIMEOUT Result, 285.2s OverallTime, 19 OverallIterations, 23 TraceHistogramMax, 14.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 284 SDtfs, 42 SDslu, 2504 SDs, 0 SdLazy, 4954 SolverSat, 147 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 11.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 966 GetRequests, 691 SyntacticMatches, 37 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 8.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=74occurred in iteration=18, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 18 MinimizatonAttempts, 20 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 257.9s SatisfiabilityAnalysisTime, 11.9s InterpolantComputationTime, 1409 NumberOfCodeBlocks, 1340 NumberOfCodeBlocksAsserted, 102 NumberOfCheckSat, 1373 ConstructedInterpolants, 0 QuantifiedInterpolants, 389959 SizeOfPredicates, 11 NumberOfNonLiveVariables, 1088 ConjunctsInSsa, 328 ConjunctsInUnsatCore, 36 InterpolantComputations, 3 PerfectInterpolantSequences, 1727/8938 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown