java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:54:31,511 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:54:31,514 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:54:31,532 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:54:31,532 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:54:31,534 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:54:31,536 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:54:31,538 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:54:31,541 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:54:31,543 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:54:31,545 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:54:31,546 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:54:31,547 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:54:31,549 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:54:31,550 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:54:31,559 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:54:31,560 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:54:31,563 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:54:31,568 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:54:31,570 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:54:31,572 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:54:31,573 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:54:31,575 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 11:54:31,584 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-24 11:54:31,600 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:54:31,600 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:54:31,601 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:54:31,601 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:54:31,602 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:54:31,602 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:54:31,602 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:54:31,602 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:54:31,602 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:54:31,603 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:54:31,603 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:54:31,603 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:54:31,603 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:54:31,603 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:54:31,603 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:54:31,604 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:54:31,604 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:54:31,604 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:54:31,604 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:54:31,604 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:54:31,605 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:54:31,605 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:54:31,605 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:54:31,605 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:54:31,605 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:54:31,606 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:54:31,606 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:54:31,606 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:54:31,651 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:54:31,674 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:54:31,678 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:54:31,679 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:54:31,680 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:54:31,681 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call3_true-termination.i [2018-10-24 11:54:31,759 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/542f38011/9e2f129a80854e0f8ba349f3db91ddd4/FLAG00ccd0d46 [2018-10-24 11:54:32,239 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:54:32,239 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call3_true-termination.i [2018-10-24 11:54:32,247 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/542f38011/9e2f129a80854e0f8ba349f3db91ddd4/FLAG00ccd0d46 [2018-10-24 11:54:32,263 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/542f38011/9e2f129a80854e0f8ba349f3db91ddd4 [2018-10-24 11:54:32,276 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:54:32,278 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:54:32,279 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:32,279 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:54:32,286 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:54:32,287 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,290 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cdbd11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32, skipping insertion in model container [2018-10-24 11:54:32,291 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,302 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:54:32,326 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:54:32,559 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:32,564 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:54:32,583 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:32,601 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:54:32,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32 WrapperNode [2018-10-24 11:54:32,601 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:32,602 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:32,603 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:54:32,603 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:54:32,613 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,619 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,643 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:32,643 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:54:32,644 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:54:32,644 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:54:32,655 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,656 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,656 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,657 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,663 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,665 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... [2018-10-24 11:54:32,666 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:54:32,667 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:54:32,667 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:54:32,667 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:54:32,668 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:54:32,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:54:32,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:54:32,978 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:54:32,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:32 BoogieIcfgContainer [2018-10-24 11:54:32,979 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:54:32,980 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:54:32,980 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:54:32,983 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:54:32,984 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:54:32" (1/3) ... [2018-10-24 11:54:32,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e878609 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:32, skipping insertion in model container [2018-10-24 11:54:32,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:32" (2/3) ... [2018-10-24 11:54:32,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e878609 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:32, skipping insertion in model container [2018-10-24 11:54:32,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:32" (3/3) ... [2018-10-24 11:54:32,987 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_true-unreach-call3_true-termination.i [2018-10-24 11:54:32,998 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:54:33,005 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:54:33,019 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:54:33,051 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:54:33,052 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:54:33,052 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:54:33,052 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:54:33,052 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:54:33,052 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:54:33,052 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:54:33,053 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:54:33,053 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:54:33,065 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-24 11:54:33,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:54:33,072 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:33,072 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:54:33,075 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:33,081 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:33,082 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-24 11:54:33,084 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:33,084 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:33,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,135 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:33,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:33,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:33,189 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:33,189 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:54:33,192 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:54:33,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:54:33,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:33,208 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-24 11:54:33,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:33,223 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-24 11:54:33,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:54:33,224 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:54:33,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:33,235 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:54:33,235 INFO L226 Difference]: Without dead ends: 8 [2018-10-24 11:54:33,241 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:33,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-24 11:54:33,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-24 11:54:33,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-24 11:54:33,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-24 11:54:33,272 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-24 11:54:33,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:33,272 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-24 11:54:33,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:54:33,272 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-24 11:54:33,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:54:33,273 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:33,273 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:33,273 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:33,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:33,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-24 11:54:33,274 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:33,274 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:33,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,275 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:33,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:33,536 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:33,537 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:33,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-24 11:54:33,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 11:54:33,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 11:54:33,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:54:33,540 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 4 states. [2018-10-24 11:54:33,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:33,635 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-24 11:54:33,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 11:54:33,636 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2018-10-24 11:54:33,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:33,637 INFO L225 Difference]: With dead ends: 14 [2018-10-24 11:54:33,637 INFO L226 Difference]: Without dead ends: 10 [2018-10-24 11:54:33,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:54:33,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-24 11:54:33,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-24 11:54:33,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-24 11:54:33,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-24 11:54:33,641 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-24 11:54:33,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:33,641 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-24 11:54:33,641 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 11:54:33,642 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-24 11:54:33,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-24 11:54:33,643 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:33,643 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:33,643 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:33,644 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:33,644 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-24 11:54:33,644 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:33,644 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:33,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,646 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:33,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:33,794 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:33,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:33,795 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:33,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:33,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:33,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:33,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:33,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:33,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:54:33,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:54:33,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:54:34,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:54:34,000 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 5 states. [2018-10-24 11:54:34,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:34,207 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-24 11:54:34,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:54:34,209 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2018-10-24 11:54:34,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:34,210 INFO L225 Difference]: With dead ends: 16 [2018-10-24 11:54:34,210 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:54:34,211 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:54:34,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:54:34,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 11:54:34,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 11:54:34,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-24 11:54:34,214 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-24 11:54:34,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:34,214 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-24 11:54:34,215 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:54:34,219 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-24 11:54:34,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 11:54:34,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:34,221 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:34,221 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:34,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:34,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-24 11:54:34,222 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:34,223 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:34,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:34,224 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:34,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:34,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:34,554 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:34,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:34,554 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) [2018-10-24 11:54:34,571 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:34,604 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:34,604 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:34,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:34,680 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:34,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:34,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-24 11:54:34,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 11:54:34,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 11:54:34,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:54:34,707 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2018-10-24 11:54:34,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:34,768 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-24 11:54:34,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 11:54:34,768 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2018-10-24 11:54:34,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:34,769 INFO L225 Difference]: With dead ends: 18 [2018-10-24 11:54:34,769 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 11:54:34,770 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:34,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 11:54:34,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 11:54:34,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 11:54:34,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 11:54:34,774 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 11:54:34,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:34,774 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 11:54:34,775 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 11:54:34,775 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 11:54:34,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:54:34,775 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:34,776 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:34,776 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:34,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:34,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-24 11:54:34,777 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:34,777 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:34,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:34,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:34,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:34,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:35,021 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:35,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:35,022 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:35,039 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:35,088 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 11:54:35,089 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:35,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:35,168 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:35,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:35,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-24 11:54:35,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:54:35,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:54:35,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:35,194 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2018-10-24 11:54:35,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:35,270 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-24 11:54:35,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:54:35,270 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-10-24 11:54:35,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:35,271 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:54:35,271 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 11:54:35,272 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:54:35,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 11:54:35,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 11:54:35,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 11:54:35,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 11:54:35,276 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-24 11:54:35,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:35,277 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 11:54:35,277 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:54:35,277 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 11:54:35,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 11:54:35,278 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:35,278 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:35,278 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:35,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:35,279 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-24 11:54:35,279 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:35,279 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:35,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:35,280 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:35,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:35,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:35,790 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:35,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:35,791 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:35,800 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:54:35,818 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:54:35,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:35,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:35,883 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:35,910 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:35,910 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-24 11:54:35,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:54:35,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:54:35,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:54:35,912 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2018-10-24 11:54:36,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:36,021 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-24 11:54:36,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:54:36,022 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2018-10-24 11:54:36,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:36,023 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:54:36,023 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:54:36,024 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:54:36,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:54:36,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 11:54:36,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 11:54:36,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 11:54:36,027 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-24 11:54:36,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:36,028 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 11:54:36,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:54:36,028 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 11:54:36,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 11:54:36,029 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:36,029 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:36,030 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:36,030 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:36,030 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-24 11:54:36,030 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:36,030 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:36,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:36,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:36,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:36,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:36,222 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:36,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:36,223 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:36,232 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:54:36,280 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-24 11:54:36,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:36,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:36,357 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:36,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:36,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-24 11:54:36,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 11:54:36,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 11:54:36,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:54:36,380 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 9 states. [2018-10-24 11:54:36,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:36,473 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 11:54:36,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 11:54:36,474 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2018-10-24 11:54:36,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:36,475 INFO L225 Difference]: With dead ends: 24 [2018-10-24 11:54:36,475 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 11:54:36,476 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:54:36,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 11:54:36,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 11:54:36,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 11:54:36,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 11:54:36,480 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-24 11:54:36,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:36,480 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 11:54:36,480 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 11:54:36,480 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 11:54:36,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 11:54:36,481 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:36,481 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:36,481 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:36,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:36,482 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-24 11:54:36,482 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:36,482 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:36,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:36,483 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:36,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:36,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:36,890 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:36,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:36,890 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:36,900 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:54:36,932 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-24 11:54:36,932 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:36,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:36,990 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:37,012 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:37,012 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-24 11:54:37,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 11:54:37,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 11:54:37,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:54:37,013 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 10 states. [2018-10-24 11:54:37,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:37,160 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-24 11:54:37,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 11:54:37,163 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2018-10-24 11:54:37,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:37,163 INFO L225 Difference]: With dead ends: 26 [2018-10-24 11:54:37,164 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 11:54:37,164 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:54:37,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 11:54:37,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-24 11:54:37,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 11:54:37,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-24 11:54:37,168 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-24 11:54:37,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:37,169 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-24 11:54:37,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 11:54:37,169 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-24 11:54:37,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 11:54:37,170 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:37,170 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:37,170 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:37,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:37,171 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-24 11:54:37,171 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:37,171 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:37,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:37,172 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:37,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:37,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:37,437 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:37,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:37,437 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:37,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:37,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:37,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:37,516 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:37,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:37,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-24 11:54:37,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 11:54:37,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 11:54:37,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:54:37,539 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 11 states. [2018-10-24 11:54:37,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:37,668 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-24 11:54:37,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:54:37,669 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 21 [2018-10-24 11:54:37,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:37,670 INFO L225 Difference]: With dead ends: 28 [2018-10-24 11:54:37,671 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 11:54:37,672 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:54:37,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 11:54:37,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 11:54:37,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 11:54:37,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 11:54:37,676 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-24 11:54:37,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:37,677 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 11:54:37,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 11:54:37,677 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 11:54:37,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 11:54:37,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:37,678 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:37,678 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:37,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:37,679 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-24 11:54:37,679 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:37,679 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:37,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:37,680 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:37,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:37,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:37,901 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:37,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:37,902 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:37,912 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:37,927 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:37,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:37,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:37,978 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:38,000 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:38,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-24 11:54:38,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:54:38,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:54:38,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:54:38,001 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 12 states. [2018-10-24 11:54:38,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:38,283 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 11:54:38,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:54:38,284 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 23 [2018-10-24 11:54:38,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:38,284 INFO L225 Difference]: With dead ends: 30 [2018-10-24 11:54:38,284 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 11:54:38,285 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:54:38,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 11:54:38,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 11:54:38,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 11:54:38,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 11:54:38,290 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-24 11:54:38,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:38,290 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 11:54:38,291 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:54:38,291 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 11:54:38,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:54:38,291 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:38,292 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:38,292 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:38,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:38,292 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-24 11:54:38,292 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:38,293 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:38,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:38,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:38,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:38,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:38,562 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:38,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:38,562 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:38,571 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:55:03,043 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 11:55:03,044 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:03,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:03,334 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:03,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:03,355 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-24 11:55:03,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 11:55:03,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 11:55:03,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:55:03,357 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2018-10-24 11:55:03,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:03,492 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-24 11:55:03,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 11:55:03,495 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2018-10-24 11:55:03,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:03,496 INFO L225 Difference]: With dead ends: 32 [2018-10-24 11:55:03,496 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 11:55:03,497 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:55:03,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 11:55:03,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-24 11:55:03,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 11:55:03,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-24 11:55:03,501 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-24 11:55:03,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:03,502 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-24 11:55:03,502 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 11:55:03,502 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-24 11:55:03,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 11:55:03,503 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:03,503 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:03,503 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:03,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:03,504 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-24 11:55:03,504 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:03,504 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:03,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:03,505 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:03,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:03,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:03,789 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:03,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:03,790 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:03,813 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:55:03,830 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:55:03,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:03,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:03,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:03,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-24 11:55:03,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 11:55:03,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 11:55:03,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:55:03,897 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 14 states. [2018-10-24 11:55:04,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:04,348 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-24 11:55:04,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 11:55:04,349 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-10-24 11:55:04,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:04,350 INFO L225 Difference]: With dead ends: 34 [2018-10-24 11:55:04,350 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 11:55:04,351 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:55:04,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 11:55:04,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-24 11:55:04,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 11:55:04,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 11:55:04,355 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-24 11:55:04,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:04,355 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 11:55:04,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 11:55:04,356 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 11:55:04,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 11:55:04,357 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:04,357 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:04,357 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:04,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:04,357 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-24 11:55:04,358 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:04,358 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:04,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:04,359 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:04,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:04,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:04,619 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:04,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:04,620 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:04,629 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:56:27,927 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-24 11:56:27,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2018-10-24 11:56:28,509 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-24 11:56:28,510 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2018-10-24 11:56:28,510 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 11:56:28,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 11:56:28,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:56:28,511 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 15 states. [2018-10-24 11:56:28,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:56:28,697 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 11:56:28,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 11:56:28,697 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 29 [2018-10-24 11:56:28,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:56:28,698 INFO L225 Difference]: With dead ends: 36 [2018-10-24 11:56:28,698 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 11:56:28,699 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:56:28,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 11:56:28,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-24 11:56:28,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 11:56:28,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 11:56:28,703 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-24 11:56:28,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:56:28,704 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 11:56:28,704 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 11:56:28,704 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 11:56:28,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 11:56:28,705 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:56:28,705 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-24 11:56:28,705 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:56:28,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:56:28,706 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-24 11:56:28,706 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:56:28,706 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:56:28,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:28,707 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:56:28,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:28,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:29,073 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:29,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:56:29,073 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:56:29,081 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:57:53,632 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-24 11:57:53,633 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2018-10-24 11:57:54,382 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-24 11:57:54,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2018-10-24 11:57:54,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 11:57:54,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 11:57:54,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:57:54,384 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 16 states. [2018-10-24 11:57:54,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:57:54,618 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-24 11:57:54,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:57:54,618 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 31 [2018-10-24 11:57:54,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:57:54,619 INFO L225 Difference]: With dead ends: 38 [2018-10-24 11:57:54,619 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 11:57:54,620 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:57:54,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 11:57:54,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 11:57:54,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 11:57:54,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 11:57:54,624 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-24 11:57:54,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:57:54,625 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 11:57:54,625 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 11:57:54,625 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 11:57:54,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 11:57:54,626 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:57:54,626 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-24 11:57:54,626 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:57:54,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:57:54,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-24 11:57:54,626 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:57:54,627 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:57:54,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:57:54,628 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:57:54,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:57:54,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:57:55,413 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:57:55,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:57:55,414 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:57:55,422 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:57:55,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:57:55,441 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:57:55,514 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:57:55,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:57:55,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-24 11:57:55,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:57:55,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:57:55,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:57:55,535 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 17 states. [2018-10-24 11:57:55,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:57:55,748 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-24 11:57:55,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 11:57:55,749 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 33 [2018-10-24 11:57:55,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:57:55,750 INFO L225 Difference]: With dead ends: 40 [2018-10-24 11:57:55,750 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 11:57:55,751 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:57:55,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 11:57:55,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 11:57:55,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 11:57:55,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 11:57:55,756 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-24 11:57:55,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:57:55,756 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 11:57:55,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:57:55,757 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 11:57:55,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 11:57:55,757 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:57:55,758 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-24 11:57:55,758 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:57:55,758 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:57:55,758 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-24 11:57:55,758 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:57:55,758 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:57:55,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:57:55,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:57:55,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:57:55,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:57:56,935 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:57:56,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:57:56,935 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:57:56,943 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:57:56,965 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:57:56,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:57:56,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:57:57,016 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:57:57,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:57:57,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-24 11:57:57,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 11:57:57,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 11:57:57,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:57:57,038 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 18 states. [2018-10-24 11:57:57,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:57:57,296 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 11:57:57,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 11:57:57,297 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 35 [2018-10-24 11:57:57,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:57:57,297 INFO L225 Difference]: With dead ends: 42 [2018-10-24 11:57:57,298 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 11:57:57,298 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:57:57,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 11:57:57,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 11:57:57,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 11:57:57,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 11:57:57,305 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-24 11:57:57,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:57:57,305 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 11:57:57,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 11:57:57,306 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 11:57:57,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 11:57:57,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:57:57,311 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-24 11:57:57,311 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:57:57,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:57:57,312 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-24 11:57:57,312 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:57:57,312 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:57:57,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:57:57,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:57:57,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:57:57,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:57:57,651 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:57:57,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:57:57,651 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:57:57,659 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown