java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 15:41:12,173 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:41:12,174 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:41:12,193 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:41:12,193 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:41:12,194 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:41:12,195 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:41:12,197 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:41:12,199 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:41:12,199 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:41:12,200 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:41:12,201 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:41:12,201 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:41:12,202 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:41:12,204 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:41:12,204 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:41:12,205 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:41:12,207 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:41:12,209 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:41:12,210 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:41:12,211 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:41:12,212 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:41:12,218 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 15:41:12,236 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-22 15:41:12,261 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:41:12,262 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:41:12,262 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:41:12,263 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-22 15:41:12,263 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-22 15:41:12,263 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-22 15:41:12,264 INFO L133 SettingsManager]: * Use SBE=true [2018-10-22 15:41:12,264 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:41:12,264 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:41:12,264 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:41:12,264 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:41:12,265 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:41:12,265 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:41:12,265 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:41:12,265 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:41:12,265 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:41:12,266 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:41:12,266 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:41:12,266 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:41:12,266 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:41:12,266 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:41:12,267 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:41:12,267 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:41:12,267 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-22 15:41:12,267 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:41:12,267 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:41:12,267 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:41:12,268 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:41:12,321 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:41:12,337 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:41:12,341 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:41:12,342 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:41:12,343 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:41:12,343 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-22 15:41:12,413 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/69722c4d8/83f8fe7fec7f467eaee151b9300c27a6/FLAG049d4509a [2018-10-22 15:41:12,793 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:41:12,793 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-22 15:41:12,799 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/69722c4d8/83f8fe7fec7f467eaee151b9300c27a6/FLAG049d4509a [2018-10-22 15:41:12,817 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/69722c4d8/83f8fe7fec7f467eaee151b9300c27a6 [2018-10-22 15:41:12,827 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:41:12,829 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:41:12,829 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:41:12,830 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:41:12,833 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:41:12,835 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:41:12" (1/1) ... [2018-10-22 15:41:12,838 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e7fca2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:12, skipping insertion in model container [2018-10-22 15:41:12,838 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:41:12" (1/1) ... [2018-10-22 15:41:12,848 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:41:12,872 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:41:13,075 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:41:13,080 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:41:13,096 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:41:13,111 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:41:13,111 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13 WrapperNode [2018-10-22 15:41:13,112 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:41:13,113 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:41:13,113 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:41:13,113 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:41:13,122 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,128 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,147 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:41:13,147 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:41:13,148 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:41:13,148 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:41:13,158 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,158 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,159 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,159 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,160 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,165 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,166 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... [2018-10-22 15:41:13,167 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:41:13,168 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:41:13,168 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:41:13,168 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:41:13,169 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:41:13,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:41:13,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:41:13,519 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:41:13,519 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:41:13 BoogieIcfgContainer [2018-10-22 15:41:13,519 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:41:13,522 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:41:13,522 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:41:13,525 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:41:13,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:41:12" (1/3) ... [2018-10-22 15:41:13,526 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66404fb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:41:13, skipping insertion in model container [2018-10-22 15:41:13,526 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:41:13" (2/3) ... [2018-10-22 15:41:13,527 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66404fb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:41:13, skipping insertion in model container [2018-10-22 15:41:13,527 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:41:13" (3/3) ... [2018-10-22 15:41:13,530 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call1.i [2018-10-22 15:41:13,539 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:41:13,547 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:41:13,564 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:41:13,601 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:41:13,602 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:41:13,602 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:41:13,603 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:41:13,603 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:41:13,603 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:41:13,603 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:41:13,603 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:41:13,603 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:41:13,620 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-22 15:41:13,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-22 15:41:13,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:13,628 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-22 15:41:13,630 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:13,644 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:13,644 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-22 15:41:13,646 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:13,647 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:13,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:13,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:13,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:13,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:13,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:13,760 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:41:13,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:41:13,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:41:13,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:41:13,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:41:13,779 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-22 15:41:13,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:13,794 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-22 15:41:13,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:41:13,795 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-22 15:41:13,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:13,805 INFO L225 Difference]: With dead ends: 20 [2018-10-22 15:41:13,805 INFO L226 Difference]: Without dead ends: 8 [2018-10-22 15:41:13,809 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:41:13,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-22 15:41:13,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-22 15:41:13,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-22 15:41:13,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-22 15:41:13,843 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-22 15:41:13,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:13,844 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-22 15:41:13,844 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:41:13,844 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-22 15:41:13,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-22 15:41:13,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:13,845 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:13,845 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:13,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:13,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-22 15:41:13,846 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:13,846 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:13,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:13,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:13,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:13,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:13,978 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:13,979 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:41:13,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 15:41:13,987 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 15:41:13,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 15:41:13,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:41:13,988 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-22 15:41:14,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:14,056 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-22 15:41:14,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:41:14,057 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-22 15:41:14,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:14,058 INFO L225 Difference]: With dead ends: 14 [2018-10-22 15:41:14,058 INFO L226 Difference]: Without dead ends: 10 [2018-10-22 15:41:14,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:41:14,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-22 15:41:14,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-22 15:41:14,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-22 15:41:14,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-22 15:41:14,063 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-22 15:41:14,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:14,063 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-22 15:41:14,063 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 15:41:14,063 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-22 15:41:14,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-22 15:41:14,064 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:14,064 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:14,064 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:14,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:14,065 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-22 15:41:14,065 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:14,065 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:14,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:14,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:14,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:14,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:14,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:14,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:14,183 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:14,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:14,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:14,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:14,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:14,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:14,304 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-22 15:41:14,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 15:41:14,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 15:41:14,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-22 15:41:14,305 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-22 15:41:14,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:14,447 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-22 15:41:14,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 15:41:14,447 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-22 15:41:14,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:14,448 INFO L225 Difference]: With dead ends: 16 [2018-10-22 15:41:14,448 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 15:41:14,449 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-22 15:41:14,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 15:41:14,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 15:41:14,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 15:41:14,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-22 15:41:14,452 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-22 15:41:14,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:14,453 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-22 15:41:14,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 15:41:14,453 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-22 15:41:14,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 15:41:14,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:14,454 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:14,454 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:14,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:14,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-22 15:41:14,455 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:14,455 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:14,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:14,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:14,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:14,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:14,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:14,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:14,662 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:14,677 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:41:14,701 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:41:14,701 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:14,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:14,717 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:14,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:14,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-22 15:41:14,738 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:41:14,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:41:14,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:41:14,739 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-22 15:41:14,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:14,863 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-22 15:41:14,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:41:14,864 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-22 15:41:14,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:14,865 INFO L225 Difference]: With dead ends: 18 [2018-10-22 15:41:14,865 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 15:41:14,865 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:41:14,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 15:41:14,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 15:41:14,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 15:41:14,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 15:41:14,869 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 15:41:14,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:14,869 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 15:41:14,869 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:41:14,870 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 15:41:14,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 15:41:14,870 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:14,870 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:14,871 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:14,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:14,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-22 15:41:14,871 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:14,871 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:14,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:14,872 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:14,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:14,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:15,192 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:15,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:15,192 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:15,208 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:41:15,236 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 15:41:15,237 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:15,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:15,256 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:15,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:15,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-22 15:41:15,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 15:41:15,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 15:41:15,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:41:15,280 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-22 15:41:15,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:15,375 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-22 15:41:15,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 15:41:15,377 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-22 15:41:15,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:15,377 INFO L225 Difference]: With dead ends: 20 [2018-10-22 15:41:15,377 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 15:41:15,378 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:41:15,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 15:41:15,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 15:41:15,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 15:41:15,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 15:41:15,381 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-22 15:41:15,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:15,382 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 15:41:15,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 15:41:15,382 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 15:41:15,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 15:41:15,383 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:15,383 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:15,383 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:15,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:15,384 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-22 15:41:15,384 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:15,384 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:15,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:15,385 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:15,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:15,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:15,540 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:15,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:15,541 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:15,548 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:41:15,567 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:41:15,567 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:15,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:15,596 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:15,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:15,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-22 15:41:15,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 15:41:15,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 15:41:15,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:41:15,618 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-22 15:41:15,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:15,766 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-22 15:41:15,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 15:41:15,767 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-22 15:41:15,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:15,769 INFO L225 Difference]: With dead ends: 22 [2018-10-22 15:41:15,769 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 15:41:15,770 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:41:15,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 15:41:15,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 15:41:15,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 15:41:15,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 15:41:15,775 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-22 15:41:15,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:15,775 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 15:41:15,775 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 15:41:15,775 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 15:41:15,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 15:41:15,776 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:15,776 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:15,777 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:15,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:15,778 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-22 15:41:15,778 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:15,778 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:15,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:15,779 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:15,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:15,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:16,041 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:16,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:16,042 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:16,058 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:41:16,092 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 15:41:16,092 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:16,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:16,117 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:16,142 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:16,142 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-22 15:41:16,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 15:41:16,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 15:41:16,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-22 15:41:16,143 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-22 15:41:16,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:16,473 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-22 15:41:16,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 15:41:16,474 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-22 15:41:16,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:16,475 INFO L225 Difference]: With dead ends: 24 [2018-10-22 15:41:16,475 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 15:41:16,475 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-22 15:41:16,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 15:41:16,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 15:41:16,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 15:41:16,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 15:41:16,479 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-22 15:41:16,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:16,480 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 15:41:16,480 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 15:41:16,480 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 15:41:16,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 15:41:16,481 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:16,481 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:16,481 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:16,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:16,481 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-22 15:41:16,482 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:16,482 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:16,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:16,483 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:16,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:16,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:16,680 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:16,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:16,680 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:16,689 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:41:16,715 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 15:41:16,715 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:16,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:16,734 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:16,755 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:16,755 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-22 15:41:16,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 15:41:16,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 15:41:16,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:41:16,757 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-22 15:41:16,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:16,843 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-22 15:41:16,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 15:41:16,845 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-22 15:41:16,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:16,846 INFO L225 Difference]: With dead ends: 26 [2018-10-22 15:41:16,846 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 15:41:16,846 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:41:16,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 15:41:16,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 15:41:16,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 15:41:16,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-22 15:41:16,851 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-22 15:41:16,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:16,851 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-22 15:41:16,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 15:41:16,851 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-22 15:41:16,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 15:41:16,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:16,852 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:16,853 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:16,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:16,853 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-22 15:41:16,853 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:16,853 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:16,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:16,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:16,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:16,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:17,138 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:17,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:17,139 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:17,147 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:17,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:17,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:17,183 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:17,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:17,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-22 15:41:17,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 15:41:17,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 15:41:17,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-22 15:41:17,205 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-22 15:41:17,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:17,352 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-22 15:41:17,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 15:41:17,353 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-22 15:41:17,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:17,353 INFO L225 Difference]: With dead ends: 28 [2018-10-22 15:41:17,354 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 15:41:17,354 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-22 15:41:17,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 15:41:17,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 15:41:17,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 15:41:17,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 15:41:17,359 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-22 15:41:17,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:17,360 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 15:41:17,360 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 15:41:17,360 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 15:41:17,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 15:41:17,361 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:17,361 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:17,361 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:17,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:17,362 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-22 15:41:17,362 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:17,362 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:17,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:17,363 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:41:17,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:17,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:17,615 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:17,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:17,616 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:17,629 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:41:17,641 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:41:17,641 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:17,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:17,660 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:17,681 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:17,681 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-22 15:41:17,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 15:41:17,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 15:41:17,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:41:17,682 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-22 15:41:17,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:17,830 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-22 15:41:17,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 15:41:17,831 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-22 15:41:17,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:17,832 INFO L225 Difference]: With dead ends: 30 [2018-10-22 15:41:17,832 INFO L226 Difference]: Without dead ends: 26 [2018-10-22 15:41:17,833 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:41:17,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-22 15:41:17,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-22 15:41:17,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 15:41:17,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-22 15:41:17,838 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-22 15:41:17,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:17,839 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-22 15:41:17,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 15:41:17,839 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-22 15:41:17,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 15:41:17,840 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:17,840 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:17,840 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:17,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:17,840 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-22 15:41:17,841 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:17,841 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:17,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:17,842 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:17,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:17,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:18,081 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:18,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:18,082 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:18,089 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:41:44,537 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 15:41:44,537 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:44,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:44,671 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:44,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:44,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-22 15:41:44,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 15:41:44,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 15:41:44,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:41:44,677 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-22 15:41:44,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:44,839 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-22 15:41:44,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 15:41:44,840 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-22 15:41:44,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:44,841 INFO L225 Difference]: With dead ends: 32 [2018-10-22 15:41:44,842 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 15:41:44,842 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:41:44,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 15:41:44,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-22 15:41:44,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-22 15:41:44,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-22 15:41:44,847 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-22 15:41:44,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:44,848 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-22 15:41:44,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 15:41:44,848 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-22 15:41:44,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 15:41:44,849 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:44,849 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:44,849 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:44,850 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:44,850 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-22 15:41:44,850 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:44,850 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:44,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:44,851 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:44,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:44,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:45,388 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:45,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:45,388 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:45,403 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:41:45,435 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:41:45,435 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:41:45,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:41:45,452 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:45,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:41:45,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-22 15:41:45,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 15:41:45,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 15:41:45,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:41:45,475 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-22 15:41:45,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:41:45,771 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-22 15:41:45,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 15:41:45,772 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-22 15:41:45,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:41:45,773 INFO L225 Difference]: With dead ends: 34 [2018-10-22 15:41:45,773 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 15:41:45,773 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:41:45,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 15:41:45,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-22 15:41:45,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 15:41:45,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 15:41:45,778 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-22 15:41:45,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:41:45,778 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 15:41:45,778 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 15:41:45,779 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 15:41:45,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 15:41:45,779 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:41:45,780 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-22 15:41:45,780 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:41:45,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:41:45,780 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-22 15:41:45,780 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:41:45,781 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:41:45,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:45,782 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:41:45,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:41:45,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:41:46,318 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:41:46,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:41:46,318 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:41:46,327 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:42:34,335 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 15:42:34,335 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:42:34,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:34,368 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:34,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:34,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-22 15:42:34,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 15:42:34,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 15:42:34,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-22 15:42:34,390 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-22 15:42:34,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:34,543 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-22 15:42:34,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 15:42:34,543 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-22 15:42:34,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:34,545 INFO L225 Difference]: With dead ends: 36 [2018-10-22 15:42:34,545 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 15:42:34,546 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-22 15:42:34,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 15:42:34,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-22 15:42:34,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 15:42:34,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-22 15:42:34,552 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-22 15:42:34,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:34,552 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-22 15:42:34,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 15:42:34,552 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-22 15:42:34,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 15:42:34,553 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:34,553 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:34,554 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:34,554 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:34,554 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-22 15:42:34,554 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:34,554 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:34,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:34,555 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:42:34,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:34,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:34,847 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:34,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:34,847 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:42:34,855 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:42:47,049 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 15:42:47,049 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:42:47,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:47,067 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:47,088 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:47,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-22 15:42:47,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 15:42:47,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 15:42:47,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:42:47,090 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-22 15:42:47,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:47,300 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-22 15:42:47,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 15:42:47,300 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-22 15:42:47,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:47,301 INFO L225 Difference]: With dead ends: 38 [2018-10-22 15:42:47,301 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 15:42:47,302 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:42:47,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 15:42:47,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-22 15:42:47,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 15:42:47,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-22 15:42:47,307 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-22 15:42:47,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:47,307 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-22 15:42:47,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 15:42:47,307 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-22 15:42:47,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 15:42:47,308 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:47,308 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:47,308 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:47,309 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:47,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-22 15:42:47,309 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:47,309 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:47,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:47,310 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:42:47,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:47,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:47,863 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:47,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:47,863 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:42:47,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:42:47,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:47,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:47,908 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:47,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:47,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-22 15:42:47,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 15:42:47,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 15:42:47,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-22 15:42:47,930 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-22 15:42:48,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:48,270 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-22 15:42:48,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:42:48,270 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-22 15:42:48,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:48,272 INFO L225 Difference]: With dead ends: 40 [2018-10-22 15:42:48,272 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 15:42:48,273 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-22 15:42:48,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 15:42:48,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-22 15:42:48,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 15:42:48,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-22 15:42:48,278 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-22 15:42:48,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:48,279 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-22 15:42:48,279 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 15:42:48,279 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-22 15:42:48,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 15:42:48,280 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:48,280 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:48,280 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:48,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:48,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-22 15:42:48,281 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:48,281 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:48,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:48,282 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:42:48,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:48,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:48,944 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:48,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:48,944 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:42:48,951 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:42:48,992 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:42:48,992 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:42:48,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:42:49,065 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:49,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:42:49,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-22 15:42:49,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 15:42:49,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 15:42:49,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:42:49,101 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-22 15:42:49,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:42:49,533 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-22 15:42:49,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 15:42:49,534 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-22 15:42:49,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:42:49,535 INFO L225 Difference]: With dead ends: 42 [2018-10-22 15:42:49,535 INFO L226 Difference]: Without dead ends: 38 [2018-10-22 15:42:49,536 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:42:49,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-22 15:42:49,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-22 15:42:49,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 15:42:49,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-22 15:42:49,540 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-22 15:42:49,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:42:49,540 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-22 15:42:49,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 15:42:49,541 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-22 15:42:49,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 15:42:49,541 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:42:49,542 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-22 15:42:49,542 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:42:49,542 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:42:49,542 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-22 15:42:49,542 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:42:49,542 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:42:49,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:49,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:42:49,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:42:49,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:42:49,896 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:42:49,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:42:49,896 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:42:49,904 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown